T1635H-8T

Triacs Overview

The T1635H-8T is a high-temperature Snubberless Triac from STMicroelectronics, housed in a TO-220AB package. It features an RMS on-state current of 16 A and a repetitive peak off-state voltage of 800 V. The device supports a maximum junction temperature of 150 °C and offers a non-repetitive surge peak on-state current of 168 A for a full cycle at 25 °C initial junction temperature. Gate trigger current (IGT) ranges from 5 mA to 35 mA across all three triggering quadrants. Static dV/dt immunity is specified at a minimum of 2000 V/µs at 150 °C, while the critical rate of turn-off commutation ((dl/dt)c) is at least 16 A/ms under the same conditions.

Triacs Feature Summary

• High noise immunity with elevated static dV/dt levels up to the maximum junction temperature
• Robust dynamic turn-off commutation capability optimized for hard loads without snubber circuits
• Enhanced thermal management allowing operation at 150 °C junction temperature

Triacs Applications

• Home automation smart AC plugs
• Water heaters, room heaters, and coffee machines
• AC induction and universal motor control
• Inrush current limiting in AC DC rectifiers
• General purpose AC line load control

Triacs Procurement Notes

Verify component authenticity by checking the marking code against official datasheet specifications. Confirm the package type matches the required TO-220AB form factor. Ensure that the ordering suffix corresponds to the tube delivery mode as documented. Cross-reference the revision history to confirm the specific manufacturing batch aligns with current design requirements.

Triacs Selection Notes

Select this component when driving heavy AC loads requiring compact drive solutions and reduced heatsink sizes. The device is suitable for applications demanding high commutation capabilities and noise immunity up to 150 °C. Consider the thermal resistance characteristics for proper heat sinking design. Verify that the gate trigger requirements fit within the specified IGT range for the target operating quadrant.

Triacs Part Context

This part belongs to the H-Series Triacs, which are designed for high noise immunity and robust commutations. It is part of the broader T1635 family, sharing similar electrical ratings but differing in packaging and specific thermal or insulation characteristics. The H-series designation indicates enhanced performance in high-temperature environments compared to standard variants.

Triacs Replacement Considerations

Direct substitutes include other STMicroelectronics Triacs from the T1635 series such as the T1635T-8T or T1635H-8I, provided the package and insulation requirements match. Verify that any replacement maintains the 16 A current rating and 800 V blocking voltage. Ensure the alternative device supports the necessary 150 °C junction temperature operation.