Alumina DBC substrates

2 year ago

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Shaanxi Puwei Electronic Technology Co., Ltd

2 year

Product details

Direct Bonded Copper (DBC) on Aluminum Nitride Substrate: Ultimate Thermal & Electrical Solution

Product Overview

Puwei's Direct Bonded Copper (DBC) Aluminum Nitride Substrates represent a breakthrough in high-performance circuit board technology. Engineered for the most demanding thermal and electrical environments, they combine the exceptional thermal conductivity of AlN ceramic (170-230 W/m·K) with the superior electrical conductivity and bonding strength of pure copper. This product is specifically designed to address critical challenges in power devices, high-frequency modules, and advanced electronic packaging, offering unmatched reliability and performance for integrated circuits and high-power microelectronic components.

Why Puwei DBC AlN is the Preferred Choice for Engineers

Unrivaled Thermal Management (170-230 W/m·K): Actively pulls heat away from high-power microelectronic components, enabling higher power density and preventing thermal failure in integrated circuits.
Exceptional Copper Bond Strength (>8 N/mm): The direct bonding process creates a permanent, metallurgical bond that withstands extreme thermal cycling without delamination, ensuring long-term reliability for hybrid micro circuits and thick film hybrid microcircuits.
Superior High-Frequency Performance: Low dielectric loss and stable dielectric constant make it ideal for microwave applications, RF circuits, and high-frequency modules, minimizing signal distortion in 5G infrastructure.
Matched CTE with Semiconductors: Coefficient of Thermal Expansion (4.5×10⁻⁶/°C) closely matches silicon and gallium arsenide, reducing stress and increasing the lifespan of mounted chips in sensor packaging and microelectronics packaging.
Complete Design & Customization Freedom: From custom circuit patterns to specific thicknesses, we provide tailored solutions for thermoelectric cooling assemblies, optoelectronics applications, and complex power devices.

DBC Ceramic Substrate Performance Specifications and Comparison Chart

Comprehensive performance specifications and material comparison for DBC AlN substrates.

Technical Specifications

Puwei DBC AlN Substrates are manufactured to precise specifications to ensure consistent, high-performance results in your application.

Base Material & Key Properties

Substrate Material: High-Purity Aluminum Nitride (AlN) Ceramic.
Thermal Conductivity: 170 - 230 W/(m·K).
Dielectric Constant (εr): 8.5 - 9.0 @ 1 MHz.
Breakdown Voltage: > 15 kV/mm.
Volume Resistivity: > 10¹⁴ Ω·cm.
Coefficient of Thermal Expansion (CTE): 4.5 × 10⁻⁶/°C (RT-400°C).
Surface Roughness (Ra): ≤ 0.4 μm (Polished).

Copper Layer & Construction

Copper Type: ≥99.9% Oxygen-Free High Conductivity Copper.
Copper Thickness: 0.1 mm - 0.6 mm (Standard), Customizable.
Bond Strength (Peel Test): > 8 N/mm.
Standard Substrate Thickness: 0.25 mm - 1.5 mm.
Max Standard Panel Size: 150 mm × 150 mm.
Operating Temperature Range: -55°C to 850°C.

Technology & Competitive Advantages

The DBC Process: Creating an Unbreakable Bond

Unlike plated or printed methods, the Direct Bonding process involves a high-temperature reaction between copper and AlN in a controlled atmosphere. This forms a robust copper-oxygen eutectic bond that is integral to the ceramic, resulting in exceptional thermal transfer and mechanical stability for bare ceramic plates used in final assemblies.

Key Performance Advantages Over Alternatives

vs. Alumina (Al2O3) DBC: 8-10 times higher thermal conductivity for vastly superior heat dissipation in power devices.
vs. Insulated Metal Substrates (IMS): Higher operating temperature, better dielectric strength, and superior performance in high-frequency modules and microwave components.
vs. Direct Plated Copper (DPC): Thicker copper layers for higher current carrying capacity and stronger bond strength for reliable thermoelectric modules for electric power generation.
vs. Beryllium Oxide (BeO): Offers comparable thermal performance without toxicity concerns, making it a safer, modern alternative for electronic packaging.

Design & Integration Guidelines

System Thermal Analysis: Model your power dissipation requirements using our DBC AlN thermal conductivity data (170-230 W/m·K) to optimize power devices layout.
Circuit Pattern Design: Submit your custom layout for photolithography and etching – we support complex geometries for thick film printed circuits and hybrid micro circuits.
Component Attachment: Solder or braze high-power microelectronic components directly to the copper surfaces using standard assembly processes.
Thermal Interface: Mount the DBC substrate to your heat sink or cold plate using appropriate thermal interface materials to maximize heat transfer.
Reliability Validation: Perform thermal cycling (-55°C to 150°C) and electrical testing to verify performance for your specific sensor packaging or microwave applications.

Primary Application Scenarios

1. Power Electronics & Converters

The cornerstone of modern power devices like IGBT modules, SiC/GaN power converters, and motor drives. DBC AlN effectively manages heat from high-current switches, enabling smaller, more efficient, and more reliable systems for electric vehicles and industrial automation.

2. RF & Microwave Communications

Essential for microwave components, RF power amplifiers (LDMOS, GaN), and high-frequency modules in 5G infrastructure, radar, and satellite communications. Its stable electrical properties ensure minimal signal loss and distortion.

3. Advanced Microelectronics & Optoelectronics Packaging

Provides a high-performance platform for optoelectronics applications (laser diodes, high-power LEDs), sensor packaging, and complex microelectronics packaging. It serves as a critical insulation element and heat spreader in multi-chip modules.

4. Specialized Thermal Management Systems

Used in thermoelectric cooling assemblies (Peltier devices) and power generation modules, where efficient heat transfer across the junction is critical for performance and longevity.

5. High-Reliability Aerospace & Defense

Withstands extreme thermal cycling and vibration, making it suitable for radar systems, flight controls, and satellite power management where ceramic components must perform flawlessly.

Strategic Value for Your Operations

Increase Power Density by 40-60%: Superior thermal conductivity enables more compact designs with higher power handling – critical for next-generation electronic packaging.
Enhance System Reliability: CTE matching reduces thermal stress failures by up to 50%, while bond strength >8 N/mm prevents delamination during thermal cycling.
Simplify Assembly Processes: Direct solderability to copper surfaces eliminates additional metallization steps, reducing manufacturing complexity.
Extend Product Lifespan: Chemical inertness and mechanical robustness ensure 5-10x longer service life than polymer-based alternatives in harsh environments.
Accelerate Time-to-Market: Custom prototypes available in 2-3 weeks for rapid design validation and iteration.

Customization & OEM/ODM Engineering Services

Puwei specializes in co-engineering DBC AlN substrates to meet your exact electrical, thermal, and mechanical requirements. We support prototypes to high-volume production for thick film hybrid microcircuits and complex assemblies.

Customizable Parameters

Circuit Pattern: Custom photolithography and etching for precise traces, pads, and geometries – ideal for RF circuits and microwave components.
Dimensions & Shape: Non-standard sizes, contours, and cut-outs available up to 150mm panels.
Layer Structure: Single-sided, double-sided, or multi-layer DBC constructions for high-power microelectronic components.
Surface Finish: Immersion Gold (ENIG), Silver, Nickel, or bare copper for soldering/brazing in thermoelectric cooling assemblies.
Integration: Can be combined with other Puwei ceramic components like precision-drilled AlN discs or alumina ceramic substrates for hybrid solutions.

Manufacturing Process & Quality Assurance

Our vertically controlled manufacturing ensures every substrate meets the highest standards of quality and consistency for integrated circuit and power device applications.

Material Sourcing & Inspection: Certification of high-purity AlN powder and oxygen-free copper foil.
Ceramic Substrate Fabrication: Precision forming and high-temperature sintering to achieve optimal density and properties – producing bare ceramic plates with exceptional quality.
Direct Bonding: Controlled atmospheric furnace bonding to create the permanent copper-ceramic interface.
Precision Patterning: Advanced photolithography and etching to define circuit patterns for thick film printed circuits and hybrid micro circuits.
Rigorous Final Inspection: 100% electrical testing, bond strength (peel test), dimensional verification, and visual inspection under microscope.

Certifications, Compliance & Reliability

Puwei Ceramic is committed to global quality and environmental standards, providing you with a dependable and compliant component for worldwide markets.

Quality Management: ISO 9001:2015 Certified Manufacturing.
Environmental Compliance: Fully compliant with RoHS and REACH directives – safe for global distribution.
Material Safety: Non-toxic and safe alternative to BeO ceramics.
Reliability Testing: Standard thermal cycling, humidity, and high-voltage testing protocols are available to validate performance for your specific integrated circuit or sensor packaging application.