BTA40-800B

Triacs Overview

The BTA40-800B is a standard three-terminal triac manufactured by STMicroelectronics, designed for general-purpose AC switching applications. It features an 800 V repetitive peak off-state voltage and a 40 A RMS on-state current rating. The device utilizes the RD-91 insulated package, providing electrical isolation with a 2500 Vrms insulation rating between the tab and terminals. Key electrical parameters include a maximum gate trigger voltage of 1.3 V, a maximum gate trigger current of 100 mA, and a peak on-state voltage of 1.55 V at 25°C junction temperature. It supports a non-repetitive surge current of 420 A (60 Hz) and operates within a junction temperature range of -40°C to +125°C.

Triacs Feature Summary

• High current handling capability with low thermal resistance due to clip bonding technology
• Insulated base design rated at 2500 Vrms for enhanced safety in panel mounting
• High commutation capability suitable for demanding AC load switching
• Compliant with UL 1557 standards and RoHS directives

Triacs Applications

• Static relay ON/OFF switching functions
• Phase control operations in lighting dimmers
• Motor speed controllers and induction motor starting circuits
• Heating regulation systems

Triacs Procurement Notes

Verify component authenticity through official STMicroelectronics channels or authorized distributors. Confirm the specific ordering suffix matches the required package variant. Ensure compliance with RoHS and UL 1557 requirements if mandated by the end application. Cross-reference datasheet revisions to confirm parameter consistency before finalizing procurement specifications.

Triacs Selection Notes

Select this component when high current capacity and electrical isolation are required for AC loads. The RD-91 package necessitates panel mounting; verify heatsink dimensions accordingly. Ensure the gate drive circuit can supply at least 100 mA to guarantee reliable triggering. Consider the 800 V blocking voltage relative to the line voltage peaks in the target application environment.

Triacs Part Context

This device belongs to the BTA40 series of standard triacs from STMicroelectronics. The series is engineered for robust performance in industrial and consumer AC power control environments. The BTA40-800B specifically denotes the 800 V voltage grade within this family, sharing common thermal and mechanical characteristics with other variants like the BTA40-600B.

Triacs Replacement Considerations

Direct replacements must match the 40 A current rating, 800 V voltage rating, and RD-91 package footprint. Verify that substitute components maintain equivalent gate trigger characteristics and thermal resistance values to ensure system reliability without redesigning the cooling infrastructure.