T405-700B-TR

Overview

The T405-700B-TR is a logic-sensitive gate Triac manufactured by STMicroelectronics, designed for AC inductive load control. It features an 800 V repetitive peak off-state voltage and a 4 A RMS on-state current capability. The device utilizes Snubberless technology to provide high commutation performance without external snubber circuits. Key electrical parameters include a maximum gate trigger current of 5 mA and a holding current of 10 mA. It operates within a junction temperature range of -40°C to 125°C and is housed in a surface-mount DPAK (TO-252-3) package.

Feature Summary

• Logic-level sensitivity enables direct drive from microcontrollers or low-power logic gates with minimal gate current requirements.
• Snubberless design simplifies circuit architecture by eliminating the need for external RC snubber networks across the main terminals.
• High surge current handling capacity supports robust operation when switching inductive loads such as universal motors and solenoids.

Applications

• Control circuits for universal motors in power tools and kitchen appliances
• Electro-valve actuation systems in dishwashers and washing machines
• General-purpose AC light dimming applications requiring logic interface compatibility

Procurement Notes

Verify the specific voltage rating suffix during procurement, as the T405 series includes variants with different blocking voltages. Confirm the package type matches the target PCB footprint, typically DPAK for this model. Ensure the ordering code corresponds to the tape-and-reel configuration required for automated assembly processes. Cross-reference the manufacturer part number with distributor codes to avoid selection errors between similar logic-sensitive Triacs.

Selection Notes

Select this component when designing AC switches that require direct interfacing with 5V or 3.3V logic outputs without additional driver transistors. The 4A current rating suits moderate-power household appliances but may be insufficient for heavy industrial machinery. Consider thermal management requirements for the DPAK package if operating near the upper limits of the current or temperature specifications.

Part Context

This Triac belongs to the T405 family, which represents STMicroelectronics' Snubberless technology line. These devices are engineered to replace traditional Triacs that require complex external protection circuits. The family offers a balance of high voltage blocking capabilities and sensitive gate triggering, making it a standard choice for cost-effective AC power control modules in consumer electronics.

Replacement Considerations

Direct replacements must match the 4A current rating, 800V voltage rating, and logic gate sensitivity. Verify that alternative components support the same DPAK package dimensions and pinout configuration. Check that substitute parts offer comparable non-repetitive surge current ratings to ensure system reliability under startup conditions.