What is BT PCB?

BT PCB refers to a printed circuit board (PCB) whose base substrate material is primarily composed of Bismaleimide Triazine (BT) resin.

• BT is a high-performance thermoset polymer resin, specifically a copolymer formed by reacting Bismaleimide (BMI) and Triazine.
• It is renowned for its exceptional thermal stability, high glass transition temperature (Tg typically ranging from 180°C to over 300°C depending on the formulation), low dielectric constant (Dk), and low dissipation factor (Df).

• Superior Thermal Performance: Its very high Tg allows BT PCBs to withstand the high temperatures encountered during lead-free soldering processes and continuous operation in demanding environments without significant degradation or warping. It offers excellent thermal resistance.
• Excellent Electrical Properties: Low Dk and Df make BT resin ideal for high-frequency and high-speed digital applications. These properties minimize signal loss (insertion loss) and signal distortion (attenuation), ensuring signal integrity, especially important for RF circuits, high-speed data transmission (e.g., 5G, high-speed servers), and IC substrates.
• High Reliability & Stability: BT resin exhibits low moisture absorption, excellent chemical resistance, and good dimensional stability. This translates to long-term reliability under harsh conditions (heat, humidity, chemicals) and consistent electrical performance.
• Compatibility with Fine Features: BT laminates are suitable for manufacturing PCBs with very fine lines, spaces, and microvias, which is crucial for advanced packaging (like substrates for BGAs, CSPs, Flip Chips) and high-density interconnect (HDI) boards.

• IC Substrates: BT is the dominant material for packaging substrates for Ball Grid Arrays (BGAs), Chip Scale Packages (CSPs), and Flip-Chip packages used in microprocessors, GPUs, and memory chips.
• High-Frequency/RF Circuits: Used in RF modules, antennas, radar systems, satellite communication equipment, and high-speed networking gear where signal integrity is paramount.
• High-Density Interconnect (HDI) PCBs: Essential for complex multilayer boards found in smartphones, tablets, wearables, and other miniaturized electronics requiring dense routing.
• Automotive Electronics: Increasingly used in engine control units (ECUs), ADAS sensors, and infotainment systems demanding high thermal and long-term reliability.