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Choosing the Right Ceramic Substrate for High-Power LED Thermal Management

In the context of the rapid popularization of LED lighting, thermal management has become a crucial factor determining the performance, reliability, and lifespan of LEDs. As LED technology advances towards higher power, higher brightness, and greater integration, the heat density per unit area continues to rise. Insufficient heat dissipation capacity will directly restrict the further improvement of device performance.

When the junction temperature is too high, LEDs will experience problems such as wavelength drift of light emission, attenuation of light efficiency, accelerated aging of phosphor, and a significant reduction in service life. Therefore, how to efficiently and stably transfer the heat generated by the chips has become a key issue in the design of high-power LED packages.

In reality, the heat generated by LED electronic devices is generally dissipated outward through the substrate. The substrate, as the core of thermal management, can quickly absorb the heat generated by the chip and achieve uniform heat distribution. Subsequently, it efficiently disperses the heat to the environment through the heat sink, ensuring the long-term stable operation of the LED.

The thermal conductivity, thermal resistance characteristics of the substrate, as well as its compatibility with the packaging process, directly determine the overall thermal management level of the LED. The ceramic substrate materials have performed quite well in these aspects and have gradually replaced the traditional metal or composite substrate materials to become the choice for high-power LEDs.

Ceramic substrate materials vary in performance and cost, and should be selected based on LED power level, thermal requirements, and application conditions.

Common Ceramic Substrate Materials and Their Characteristics

Alumina Substrate (Al2O3)
The most widely used ceramic substrate material at present. It has comprehensive advantages such as low cost, high mechanical strength, mature technology, and good reliability. Its thermal conductivity is typically between 20 and 30 W/m·K, which is sufficient to meet the heat dissipation requirements of medium and low-power LEDs. Therefore, it is a very cost-effective and practical choice in general lighting and applications where cost is a major concern.

Aluminum Nitride Substrate (AlN)
AlN offers 170–230 W/m·K thermal conductivity, far exceeding alumina. Its thermal expansion closely matches silicon chips, reducing thermal stress and improving reliability. With a low dielectric constant and excellent insulation, AlN is ideal for high-power, high-density LEDs and high-frequency devices.

Zirconia Toughened Alumina Substrate (ZTA)
ZTA is a composite ceramic made by adding zirconia to alumina. It offers high mechanical strength, excellent fracture toughness, and good reliability. Its thermal conductivity is higher than standard alumina but lower than AlN. ZTA is suitable for LED applications requiring high mechanical strength and thermal shock resistance, maintaining effective heat dissipation while enhancing crack resistance and long-term stability.

Silicon Nitride Substrate (Si₃N₄)
Si₃N₄ substrates offer high mechanical strength, excellent thermal shock resistance, and good thermal conductivity. They remain stable under large temperature variations and frequent thermal cycling, ensuring long-term reliability. Despite higher processing difficulty, Si₃N₄ is the preferred choice for LED and industrial applications demanding maximum reliability.

Key Factors for Selecting Ceramic Substrates

– Thermal conductivity: Controls junction temperature and heat efficiency.
– CTE matching: Reduces thermal stress for reliable operation.
– Dielectric/insulation: Ensures electrical safety and stable signals.
– Mechanical strength and processability: Suitable for packaging processes and long-term usage requirements.
– Cost and Customization: Meeting the requirements of various application scenarios and production scales.

Suggestions for Substrate Selection for LEDs of Different Power Ratings

1. Medium-Low Power LEDs (≤ 1 W)
The heat generation is relatively low, and the requirement for heat dissipation is relatively relaxed. The alumina (Al2O3) ceramic substrate can meet the temperature control requirements, featuring low cost and mature technology, and is suitable for general lighting and cost-sensitive applications.

2. Medium-Power LED (1–3 W)
The increase in heat density leads to higher demands for thermal conductivity and reliability. High-purity alumina or ZTA substrates, while balancing heat dissipation performance and mechanical strength, maintain a good cost-performance ratio and are suitable for conventional medium-power lighting applications.

3. High-Power LED (≥ 3 W)
Temperature control becomes the key. Aluminum nitride (AlN) ceramic substrates, with their high thermal conductivity and excellent thermal expansion matching, can effectively reduce the package thermal resistance and are the mainstream choice for high-power LEDs.

4. High Power Density and High Reliability Applications
Under conditions of high temperature, high stress, or frequent thermal cycling, silicon nitride (Si₃N₄) substrates, with their excellent mechanical strength and thermal shock resistance, are suitable for applications with extremely high reliability requirements.

At Innovacera, we offer a variety of ceramic substrate materials and customized size solutions to meet the thermal management requirements of LEDs of different power levels.

What advantages does the application of circuits on alumina ceramic substrates offer?

Aluminium oxide ceramic substrates are extensively employed as base materials within the radio frequency and microwave electronics sector. Their high dielectric constant facilitates circuit miniaturisation, while their excellent thermal stability, high substrate strength and superior chemical stability outperform most other oxide materials. These substrates are suitable for diverse applications including thick-film circuits, thin-film circuits, hybrid circuits, and microwave component modules.

Alumina ceramic substrates are classified by purity, commonly 90%, 96%, and 99%. The primary difference lies in the amount of dopant material. Less dopant results in higher purity. Alumina substrates with different purities exhibit distinct electrical and mechanical properties. Generally, higher purity substrates have a higher dielectric constant, lower dielectric loss, and better surface finish.

Applications of Alumina Ceramic Substrates in Circuits

① Thin-Film Microstrip Circuits
Using alumina ceramic substrates for thin-film microstrip circuits allows for gold layer thicknesses up to 3.5µm. These circuits can connect to external circuitry via gold wire bonding. Common substrate thicknesses include 0.127mm, 0.254mm, 0.381mm, and 0.508mm.

② Thin-Film Filters
Thin-film filters fabricated on alumina ceramic substrates are commonly used as frequency-selective elements in various microwave modules, assemblies, and systems. These filters are manufactured using thin-film processing techniques including sputtering, photolithography, wet or dry etching, cleaning, and dicing.

③ Thin-Film Terminations
Thin-film terminations designed on alumina ceramic substrates are frequently used for port matching in microwave circuit modules and assemblies, absorbing excess reflected power. The sheet resistance of the tantalum nitride (TaN) layer in thin-film processes is controllable, allowing for the production of high-precision terminations. Their extremely small size makes them excellent choices for module miniaturization. They are typically attached to circuit terminals using conductive epoxy or gold-tin (AuSn) eutectic bonding.

④ Thin-Film Equalizers
Thin-film equalizers on alumina ceramic substrates are commonly used to adjust broadband power flatness in microwave circuits. By varying the sheet resistance of the integrated TaN layer and the resistor pattern design, different resistance values are achieved to shape the device’s output waveform, compensating the input power signal to achieve the desired power flatness.

⑤ Thin-Film Power Dividers
Thin-film power dividers on alumina ceramic substrates are often used in multi-channel communication network systems. They inherently provide power division according to a specified ratio, typically featuring one input and multiple outputs. Thin-film power dividers readily facilitate multi-section ultra-wideband designs, resulting in physically small components that are easy to integrate and offer good performance.

⑥ Thin-Film Attenuators
Thin-film attenuators designed on alumina ceramic substrates are commonly used for attenuating large signals in microwave RF modules or for providing multi-step attenuation adjustment in digitally controlled attenuator circuits. They can achieve high attenuation flatness over ultra-wide bandwidths with stable performance.

⑦ Thin-Film Couplers
Thin-film couplers on alumina ceramic substrates are often used for power detection or signal separation in microwave module systems. Couplers with arbitrarily weak coupling factors can be designed. Integrated isolation loads can be implemented using TaN. Ports can be designed in surface-mount configurations, allowing direct soldering onto the circuit board. Multi-section designs enable operation over wide bandwidths.

⑧ Thin-Film Hybrid Couplers (Bridges)
Thin-film hybrid couplers, also known as 3dB couplers or bridges, designed on alumina ceramic substrates, are commonly used to split signals with a 90° or 180° phase difference. The Lange coupler is a frequently used type, employing gold wire bonds for interconnections between transmission lines.

⑨ Thin-Film Resistors
Thin-film resistors fabricated on alumina ceramic substrates are often used in circuits requiring high precision, low noise, and high stability. They can be integrated monolithically during the microstrip circuit fabrication process or designed and manufactured separately as discrete resistors with various resistance values. They can also be arranged as resistor networks, allowing selection of the desired resistance value via gold wire bonding.

⑩ Thin-Film Capacitors
Thin-film capacitors designed on alumina ceramic substrates are often used in high-frequency filtering applications. Capacitors with arbitrary values can be designed for circuit use. Their performance is generally more stable than standard surface-mount chip capacitors, making them well-suited for high-frequency circuits.

Beyond 1200°C: How Ceramic Brazed Assemblies Survive Extreme Manufacturing

If you work in ultra-high vacuum (Uhv) manufacturing, you’ve probably run into ceramic brazed assemblies. They’re what happen when you take the best parts of ceramics and metals and put them together—high-temp resistance, corrosion protection, electrical insulation from the ceramic side, plus strength, conductivity, and formability from the metal side. You’ll find them in aerospace, semiconductors, medical gear, renewable energy—pretty much anywhere the operating conditions get nasty.

How It Works

Ceramic brazing assemblies uses specialized filler metals to create strong, vacuum-tight joints. Could be ceramic-to-ceramic, could be ceramic-to-metal. What makes it cool? It bonds two totally different materials without messing up the ceramic’s natural properties. So you end up with something that gives you the heat resistance and insulation of ceramic, plus the mechanical beef of metal. When you’re designing for extreme environments—high heat, high pressure, aggressive corrosion, high voltage—this stuff beats traditional joining methods every time. That’s not marketing talk, that’s just how it performs.

Why Engineers Spec It

We’re talking survival from -200°C all the way past 1200°C. Thermal shock? No problem. Acid exposure? Bring it. Oxidation? These things laugh at it. Whether your application lives in liquid nitrogen or sits inside a turbine, these joints hold up. Traditional components age out and fail. These don’t.

Micron-level joining precision. By controlling temperature curves, atmosphere, and filler composition tight, we get joints with zero porosity, zero cracks, zero weak points. They’re hermetic. They’re mechanically sound. That’s why you spec these for medical imaging systems and optical instruments—places where “good enough” means field failures.

This isn’t just gluing stuff together. The brazing process creates real synergy between the materials. Look at power electronics: ceramic handles the insulation, metal handles the current. Better heat dissipation, cleaner signals. Look at fuel cells: the corrosion resistance and hermeticity keep them running long after conventional joints would’ve given up.

The fillers and processes meet environmental standards—no toxic fumes, no hazardous waste. And because these components last, you’re not constantly replacing parts. Less downtime, less resource burn. It’s green manufacturing that actually works in production.

Where you’ll find it

Aerospace? Lighter, stronger engine components. Semiconductors? Stable, precision parts for wafer fab gear. Medical? Components that survive sterilization. Renewable energy? Longer life for fuel cells and power electronics.

What’s next

Performance requirements keep climbing, so the tech keeps evolving. Better precision, broader environmental range, lower cost. Ceramic brazed assemblies will show up in more places—pushing manufacturing toward smarter, cleaner, more efficient territory. It’s not just a joining process anymore—it’s an enabler.

Ceramic Substrates: Core for High-Performance Thermal Printheads

Thermal printheads (TPHs) are indispensable core components in modern printing scenarios, widely applied in retail receipt printing, logistics label marking, medical record output, and industrial tracing. Their performance directly affect printing resolution, speed, and service life. Among the key components of TPHs, ceramic substrates stand out with superior physical and chemical properties, becoming the preferred choice for high-performance thermal printheads.

1. Brief Overview of TPHs

TPHs operate based on the thermochromic effect: when electric current passes through heating elements, the elements rapidly heat up and transfer heat to heat-sensitive media, triggering a chemical reaction that forms clear text, barcodes, or patterns. Structurally, TPHs consist of heating elements, substrates, glazed layers, protective films, and drive ICs. Ceramic substrates serve as the core carrier of heating elements, undertaking dual responsibilities of mechanical support and thermal management, which are crucial for TPH stability.

2. Advantages of Ceramic Substrates

Compared to metal or other material substrates, ceramic substrates have unique advantages for TPHs. Firstly, excellent thermal management: Materials like AlN (140-180 W/(m·K)) and alumina (20-30 W/(m·K)) ensure rapid heat dissipation, avoiding overheating of heating elements. Their thermal expansion coefficient matches semiconductors, reducing thermal stress from temperature cycles. Secondly, superior surface flatness and mechanical strength: Glazed alumina substrates offer high smoothness for uniform printing, while their hardness and wear resistance withstand printing pressure. Thirdly, reliable insulation and chemical stability: High resistivity can prevent short circuits from occurring in dense component arrays, while inertness can resist corrosion in harsh environments. Moreover, they also support personalized customization of size and structure to meet various TPH design requirements.
Below is the properties for ceramic substrates:

3. Key Precautions

Key precautions cover three aspects. Electrical: Follow the correct power sequence (VDD first, then VH; turn off VH first), avoid energizing heating elements without media, and use capacitors to suppress noise. Mechanical: Prevent platen rollers from touching electrodes, avoid impact on brittle ceramic substrates, and adjust structures for thick media to ensure uniform pressure. Operation Instructions: Avoid direct contact with TPH with your hands to prevent static electricity damage; Use qualified medium to prevent electrode corrosion; Keep away from water sources; Use anhydrous ethanol or isopropyl alcohol for horizontal wiping and cleaning.

Ceramic substrates play an crucial role in enhancing TPH performance and reliability, laying a solid foundation for high-quality thermal printing. As industries like logistics and medical care demand higher printing standards, ceramic substrates will further develop through material and process innovations. Their application scope in the thermal printing industry will continue to expand, driving the upgrading of the entire industry chain.

Boron Nitride BN Ceramic Bushings For Ion Sources

Boron Nitride Ceramics is widely used in ion source equipment for insulators, bushings, and insulating support components.

Why Engineers Choose BN

Ion source equipment operates in extremely demanding conditions:

– kV-level high voltage
– High operating temperature
– Continuous plasma exposure
– High vacuum
– Corrosive gases such as O₂, F₂, and Cl₂

Not every ceramic material can remain stable under all these conditions simultaneously.

Hot Pressed Hexagonal Boron Nitride (HPBN) is one of the few materials capable of reliably handling this combination.

That is why it is widely used in ion source bushings and insulation components.

Boron Nitride Bushing – What You Get

When purchasing BN bushings, you are primarily paying for stability and reliability in harsh environments.

Key Advantages

Stable insulation performance

High resistivity helps prevent electrical leakage and breakdown under high voltage.

High temperature capability

Can operate up to 1800°C in vacuum environments.

Low impact on electric fields

Low dielectric constant helps maintain stable high-frequency performance.

Better plasma resistance (in many cases)

Compared with standard alumina, BN often provides longer service life in plasma environments.

Easy to machine and customize

Turning, milling, and drilling are straightforward, making it ideal for small-batch or custom parts.

Low outgassing

Well suited for vacuum systems where cleanliness is critical.

What to Be Aware Of

BN is not the strongest ceramic mechanically.

– Mechanical strength is lower than alumina.
– If the part must carry significant structural load, design adjustments may be required.
– For purely load-bearing applications, BN may not be the best option.

Quick Comparison for Purchasing Decisions

Alumina (Al₂O₃)

– Lower cost
– High mechanical strength
– May degrade or become brittle under plasma exposure

Aluminum Nitride (AlN)

– Excellent thermal conductivity
– More difficult and costly to machine

Boron Nitride (BN)

– Easy to machine and customize
– Strong plasma resistance
– Lower mechanical strength

Simple Selection Logic

– If mechanical strength and cost are the top priorities → Alumina is usually more suitable.
– If insulation stability, plasma resistance, and vacuum compatibility are more important → BN is often the safer and more reliable choice.

BN Parts Used in Typical Equipment

– Mass spectrometer ion sources
– Ion implanters
– Plasma etching systems
– Electron beam evaporation sources
– Hall effect thrusters

Butterfly Ceramic Package for Optoelectronic Modules

The Butterfly Ceramic Package is a housing for optoelectronic modules, which provides a fiber feed-through, built-in thermal management, and electrical fan-out for photonic integrated circuits (PICs). This package has robust quality and high reliability. The design is flexible and customized, and Innovacera developed standardized production processes suitable for high-volume manufacturing

The butterfly package employs a high-temperature ceramic (HTCC) design, which effectively improves pin density and air density reliability, and meets the miniaturization requirements of the packaged module. These high-reliability packages incorporate alumina ceramic or aluminum nitride brazed with Cu-cored alloy pins/leads and a metal heat spreader at the bottom. And the surface coating of the package can be adjusted according to the characteristics of the user’s micro-assembly process to meet the requirements and different atmospheric conditions.

The Roles of a Package
– Dissipates heat generated by IC chips.
– Protects IC chip(s) from environmental influence, including moisture, dust, light, and electromagnetic interference.
– Protects the IC chip mechanically.
– Provides input/output signals and required isolation.

Key features
– Hermeticity : 5×10-8 atm·cc/s
– Finish: Ni/Au plating for solder & wire bonding
– PICs of various sizes and several material platforms are supported
– Insulation performance: Volume resistivity > 10¹⁴Ω·cm (25℃)
– Integrated thermoelectric cooler (TEC) and thermistor for thermal control

Innovacera is committed to continuously refining its materials and assembly processes, striving to provide stronger assurance for chip applications across diverse industries. Looking forward contact our photonic packaging engineering team today to discuss your application-specific requirements.

Compared with traditional ignition needles: the outstanding advantages of silicon nitride hot surface igniters in the boiler field

Boilers, as core thermal energy equipment in industrial and commercial applications, place extremely high demands on the stability, durability, and safety of their ignition systems. Compared to traditional metal ignition pins, silicon nitride hot surface igniters demonstrate irreplaceable advantages in boiler applications. A detailed comparison is as follows:

Comparison Dimension	Traditional metal ignition pins (such as stainless steel, brass)	Silicon nitride hot surface igniter	Core advantages
Temperature resistance and thermal shock resistance	Long-term temperature resistance ≤ 600℃, prone to cracking and deformation due to sudden cooling and heating	Long-term temperature resistance ≥1300℃, excellent thermal shock stability, no cracking risk	Adapt to the high temperature flue gas environment of the boiler to avoid frequent damage to ignition components
Anti-corrosion and anti-scaling capabilities	Susceptible to flue gas corrosion and rust, boiler scale easily adheres and causes ignition failure	Strong chemical inertness, no corrosion, no scaling, long-lasting and stable ignition performance	Reduce boiler shutdown times for maintenance and lower operation and maintenance costs
Ignition success rate and environmental adaptability	Affected by humidity, dust, and gas concentration, it is easy to fail to start at low temperatures	Not affected by environmental factors, the ignition success rate is nearly 100% in environments from -40℃ to high temperature	Ensure boiler starts at low temperatures in winter and operates stably under high dust conditions
Service life and replacement frequency	The service life is about 2000-3000 hours, and it needs to be replaced every 3-6 months on average.	Service life 8000-12000 hours, replacement every 2-3 years	Reduce downtime for replacement and reduce spare parts procurement costs
Safety and energy consumption	Relying on high-voltage electric sparks, there is a risk of gas leakage and explosion; high-voltage modules have high energy consumption	No high-voltage electric sparks, higher safety; low working power, energy consumption saved by 30%	Improve boiler operation safety and save electricity consumption in long-term use

Taking industrial gas boilers as an example, after a chemical plant replaced traditional ignition needles with silicon nitride hot surface igniters, the boiler startup success rate increased from 85% to 100%, and the replacement frequency of ignition components was extended from once every four months to once every two years, reducing downtime for maintenance by approximately 12 hours each year and reducing overall operation and maintenance costs by more than 40%. At the same time, the safety hazards caused by corrosion and leakage of traditional ignition needles were completely resolved.

The performance data of the silicon nitride igniter is as follows:

In summary, as boilers increasingly demand higher reliability, safety, and lower maintenance costs, silicon nitride hot surface igniters have emerged as a superior alternative to traditional metal ignition pins. Owing to their outstanding high-temperature resistance, excellent thermal shock stability, strong corrosion and scaling resistance, and significantly extended service life, silicon nitride igniters demonstrate clear advantages in modern boiler ignition systems.

Multi-Pin Vacuum Hermetic Electrical Feedthrough for High Vacuum Applications

Hermetic Electrical Feedthrough is a critical component designed to provide reliable electrical connections between the inside of a sealed chamber and the external environment, and maintaining vacuum integrity or hermetic sealing for signal or power transmission.

Structural Design
– Multi-pin conductive design
Enables multiple signal or power channels to pass through simultaneously; pin count can be customized according to application requirements.
– Metal flange interface
Designed with standard vacuum flange configurations for secure and easy integration into vacuum systems.
– Hermetic insulating seal
Ceramic-to-metal sealing technology ensures excellent electrical insulation and long-term hermetic performance.

Key Performance Advantages
– Excellent hermeticity
Suitable for high vacuum and ultra-high vacuum applications.
– High electrical insulation and dielectric strength
Reliable operation under high voltage or sensitive signal conditions.
– Good thermal stability and mechanical strength
Suitable for thermal cycling and demanding operating conditions.
– High reliability and long service life
Ideal for critical systems requiring continuous operation.

Applications
– Vacuum furnaces and high-temperature laboratory equipment
– Semiconductor
– Electronic manufacturing equipment
– Analytical instruments
– Vacuum coating and plasma processing equipment
– Aerospace and scientific research systems

Customization Options
– Custom pin count, pin diameter, and current rating
– Various flange sizes and standards available
– Compatible with different voltage, temperature, and vacuum levels
– Available in signal, power, or hybrid configurations

Technical Specifications
Item	Specification
Product Type	Vacuum / Hermetic Electrical Feedthrough
Construction	Multi-pin, metal flange, hermetic insulating seal
Sealing Method	Ceramic-to-metal brazing / Glass-to-metal sealing
Number of Pins	2–50 pins (customizable)
Pin Material	Kovar / Stainless steel / Gold-plated copper (optional)
Insulator Material	Alumina ceramic
Flange Material	Stainless steel (304)
Flange Type	CF / KF / ISO (optional)
Vacuum Rating	High vacuum / Ultra-high vacuum
Surface Finish	Polished / Nickel plated / Gold plated (optional)
Mounting Method	Flange bolt mounting
Application Environment	Vacuum, hermetic, high-temperature, electrical insulation
Temperature Range	-269°C to 450°C, ISO KF -25°C to 205°C

Hermetic electrical feedthroughs are essential components for electrical transmission in sealed systems, where hermetic reliability and insulation performance are critical to overall system safety and stability.

Alumina Ceramic substrate – The Core Choice for Automotive Electronics

A Reliable Foundation Built for New Energy Vehicles

In the wave of electrification and intelligence, our 96% alumina ceramic substrate stands as the core support for automotive electronics. Made from 96% high-purity alumina, it combines exceptional insulation, high thermal conductivity, and mechanical strength, making it the ideal carrier for power modules and sensors.

Precision Craftsmanship, Outstanding Performance

With a dense, flat surface just like what’s shown in our product images, it provides a stable foundation for circuit printing and component mounting. In the electronic control systems of new energy vehicles, it efficiently conducts heat to ensure stable operation of IGBT modules under high loads. In autonomous driving millimeter-wave radars, its high insulation eliminates signal interference entirely.

Protecting Every Step, From Power to Perception

From powertrains to perception units, it quietly safeguards vehicle safety and performance. As the industry pursues lightweight design and high reliability, it is not only a driving force behind technological iteration but also a core partner in the future upgrade of automotive electronic architectures.

Choose durability, trust performance — our 96% alumina ceramic substrate is your reliable partner for next-gen automotive electronics.

Table 1 Dimensions and Specifications of Aluminum Ceramic Substrates

Table 2 Parameters of Aluminum Ceramic Substrates

Alumina Substrates Bring Practical Value to DPC Substrate Solutions

As the developing of the power electronics, manufacturers are looking for substrate solutions that not only deliver reliable performance but also make sense from a cost and production method. Alumina (Al₂O₃) substrates used in Direct Plated Copper (DPC) technology remain a practical and widely adopted choice across many industries.

A Reliable and Cost-Effective Material Choice

Alumina substrates have been used in electronic package for a long time due to reliable electrical insulation, strong mechanical support, and steady thermal performance, which making them a good choice for a wide range of power and electronic applications used every day.

Alumina has a great advantage for cost-effectiveness when compared with other ceramic materials. Manufacturers can reach to dependable performance without driving up overall system costs, with a well-established supply chain, stable quality, and the ability to support mass production. As a result, alumina DPC substrates are particularly well suited for high-volume production and applications where cost control is just as important as reliability.

Below is our alumina substrates properties:

Alumina Substrates Properties
Item		Test condition	Unit	Value
Content		—	—	95%~97%
Size		Customized
Tolerance		±0.5%(Min0.15mm)
Thickness		Customized 0.38-2mm
Thickness tolerance		±0.5%(Min0.03mm)
Warpage		＜0.3%
Physical Properties	Surface roughness	Ra	μm	0.2~0.5
	Density	—	g/cm3	≥3.70
	Liquid permeability	—	—	pass
	Flexure strength	Three-point bending resistance	MPa	≥380
	Vickers hardness	load 4.9	GPa	≥14
Thermal Properties	CTE	200℃		6.2~6.8
		500℃	1×10-6mm/℃	6.6~7.5
		800℃		6.6~7.9
	Thermal conductivity	25℃	W/(m*k)	≥21
	Thermal shock resistance	800℃	Time	≥10
	Volume resistivity	25℃	Ω*cm	>1014
		300℃	–	>1010
		500℃	–	>109
	Breakdow voltage	—	KV/mm	>12
	Dielectric constant	1MHz/25℃	–	9~10
	Dielectric loss	1MHz/25℃	×10-4	≤3
	Reflectivity	Reflectivity meter	%	>91
	Whiteness	Whitenesss meter	–	>88

DPC Technology Unlocks More Design Flexibility

When alumina substrates are paired with DPC technology, they unlock even more potential. By using advanced surface treatment and copper electroplating processes, fine and accurate copper circuits can be formed directly on the ceramic surface, making designs more compact and increasing circuit density.

Compared with traditional thick-film or bonded copper solutions, alumina-based DPC substrates give designers much greater freedom in how circuits are laid out. This added flexibility helps improve current flow, reduce overall system size, and support more highly integrated module designs — all while maintaining strong copper adhesion and reliable performance over time.

Serving a Wide Range of Applications

Alumina DPC substrates are widely used in:
– Industrial power supplies
– IGBT and MOSFET power modules
– LED lighting and display systems
– Consumer electronics and home appliances
– General power control and management applications

In these fields, alumina DPC substrates provide a dependable foundation that supports stable operation, efficient heat dissipation, and long service life.

Summary

Alumina substrates still remain a key component of the DPC substrate product portfolio due to its long-standing reliability, cost-effectiveness, and compatibility with mature DPC processes ensure that they remain an important choice in the electronics industry.