BTA/BTB40-41 series is a 40A standard TRIAC from ST. It has the characteristics of high current, low thermal resistance, high commutation capability and can be used in static relays, heating regulation, induction motor starting circuits, etc. It can also be used in light dimming, motor speed control and other occasions.
This datasheet details the electrical and thermal characteristics of STMicroelectronics' BTA40, BTA41, and BTB41 TRIACs. These devices are designed for general-purpose AC switching applications, including static relays, heating regulation, and phase control. The BTA series features an insulated tab rated at 2500 V rms. Key specifications include on-state RMS current up to 40 A, repetitive peak off-state voltage of 600–800 V, and low thermal resistance. The datasheet also covers absolute maximum ratings, static characteristics, thermal resistance, and package information for RD91 and TOP3 insulated packages.
| On-state rms current | 40 A |
|---|---|
| Repetitive peak off-state voltage | 600 and 800 V |
| Triggering gate current | 50 mA |
| Junction to case thermal resistance | 0.9 °C/W (RD91 insulated) / 0.6 °C/W (TOP3) |
| Junction to ambient thermal resistance | 50 °C/W (TOP3) |
The on-state RMS current is 40 A for all three devices.
The repetitive peak off-state voltage is 600 V and 800 V.
The triggering gate current is 50 mA.