2.Technical Specifications

Specification Category	Details
PCB Configuration	4-layer Construction
Layer Stackup	5mil MT77 + 1078 PP + 5mil MT77
Copper Distribution	Inner Layers: 0.5oz / Outer Layers: 1oz
Finished Board Thickness	0.6mm
Surface Finish	Immersion Silver
Solder Mask & Legend	Green Solder Mask, White Silkscreen
Panel Dimensions	126 × 78mm (Including Routing Coupon)
Via Specification	0.25mm Via, Resin Filled and Capped
Dielectric Constant (Dk)	Stable from -40°C to +140°C
Dissipation Factor (Df)	0.0017
UL Certification	E41625
Material Availability	2.5 to 60mil Thickness Options

 

 

3.Core Technology: Understanding Resin Filling for Enhanced Reliability

What is Via Resin Filling?

Via resin filling is a specialized PCB manufacturing process where conductive vias are completely filled with a non-conductive epoxy resin before subsequent plating and surface finishing. This advanced technique provides multiple performance advantages:

 

Improved Thermal Management: Eliminates air pockets that can cause thermal expansion issues

 

Enhanced Signal Integrity: Prevents solder wicking and ensures consistent impedance control

 

Surface Planarity: Creates a flat surface for fine-pitch component placement

 

Structural Reinforcement: Increases mechanical durability, particularly in high-vibration environments

 

Our 0.25mm resin-filled vias with capping plating ensure reliable performance in demanding automotive and RF applications where thermal cycling and mechanical stress are common challenges.

 

 

4.Material Advantages: Why Astra® MT77 Stands Out

Exceptional Electrical Stability

MT77 4-layer PCB maintains consistent dielectric properties across wide frequency and temperature ranges, making it ideal for W-band applications and automotive radar systems operating in challenging environmental conditions.

 

Manufacturing Efficiency

Compatible with standard FR-4 processing techniques, MT77 laminate reduces production complexity while offering:

 

Reduced drill wear compared to ceramic-filled materials

 

No plasma desmear requirements

 

Excellent dimensional stability for multi-layer constructions

 

Support for HDI and VIPPO designs

 

Cost-Effective Performance

As a viable alternative to traditional PTFE and high-cost microwave laminates, MT77 printed circuit board delivers superior electrical characteristics while maintaining competitive pricing and shorter lead times.

 

 

5.Application Solutions

Automotive Radar Systems: Adaptive cruise control, blind spot detection, pre-crash warning systems

 

Millimeter-Wave Communications: 5G infrastructure, point-to-point radio links, satellite communications

 

Advanced Driver Assistance Systems (ADAS): Lane departure warning, autonomous driving sensors

 

High-Frequency Test Equipment: Signal analyzers, network analyzers, research instrumentation

 

 

6.Conclusion

MT77-based PCB solution represents the convergence of material science excellence and practical engineering implementation. By combining ultra-low loss characteristics with robust manufacturing compatibility, MT77 high frequency circuit laminate provides designers with a reliable platform for high-frequency applications where performance consistency cannot be compromised.

 

For technical consultation regarding layer stackup optimization, impedance control, or application-specific adaptations, our engineering team offers comprehensive support throughout the design and prototyping phases.

 

Founded in 2003, Shenzhen Bicheng Electronics Technology Co., Ltd is an established high frequency PCB supplier and exporter in Shenzhen, China, serving customers worldwide.

 

We are devoted to delivering high-frequency PCB products and solutions of the highest quality, along with customized service. Get in touch with us to start your project !

Visit https://www.bicheng-enterprise.com to learn more.