High TG Materials for High Reliability and High Temperature PCB Applications

What Are High TG Materials?

High TG materials refer to PCB laminate materials with a high glass transition temperature (Tg), typically above 170°C and often reaching 180°C–200°C or higher.

The Tg value indicates the temperature at which the PCB material transitions from a rigid glass-like state to a softer rubber-like state. Using high TG materials ensures better thermal stability and mechanical reliability under elevated temperature conditions.

High TG materials are widely used in:

• Automotive electronics

• Industrial control systems

• Power electronics

• High layer count PCB

• High reliability PCB

• Lead-free assembly processes

Why High TG Materials Are Important

Modern electronic systems generate more heat due to higher power density and compact designs. Standard FR-4 materials may suffer from:

• Delamination

• Warpage

• Barrel cracking

• Reduced mechanical strength

• Poor long-term reliability

High TG materials improve:

• Thermal resistance

• Mechanical stability

• Chemical resistance

• Moisture resistance

• Long-term performance under thermal cycling

For high reliability PCB and high temperature PCB applications, high TG materials are essential.

Key Properties of High TG Materials

High Glass Transition Temperature

Typically ≥170°C, improving dimensional stability during soldering and reflow.

Improved Thermal Stability

Better performance under multiple lead-free soldering cycles.

Lower Z-Axis Expansion

Reduced risk of via cracking in multilayer PCB designs.

Enhanced Mechanical Strength

Better resistance to warpage and mechanical stress.

High TG Materials vs Standard FR-4

For automotive PCB, industrial PCB, and high power PCB applications, high TG materials provide significantly improved durability.

Applications of High TG Materials

High TG materials are commonly used in:

• Automotive control modules

• EV power systems

• Industrial automation PCB

• High layer count PCB

• High current PCB

• Server and networking PCB

• Power supply PCB

• LED driver PCB

When thermal stress and reliability are critical, high TG materials offer long-term stability.

Manufacturing Considerations

PCB fabrication with high TG materials requires:

• Controlled lamination temperature

• Precise drilling and plating

• Proper resin flow control

• Moisture management

• Strict process monitoring

Using high TG materials also improves multilayer PCB yield and reduces failure risks during assembly.

Choosing the Right High TG PCB Supplier

A professional high TG PCB supplier should provide:

• Multiple high TG laminate options

• High layer count PCB capability

• Controlled impedance support

• Automotive-grade PCB manufacturing

• Stable quality control systems

Selecting high TG materials ensures durability, reliability, and consistent performance in demanding applications.