T835H-8T

Overview

The T835H-8T is an 8 A medium current Triac in a TO-220AB package, designed for operation at 800 V and up to 150 °C junction temperature. It features three triggering quadrants with high static dV/dt noise immunity (min. 2000 V/µs at Tj max) and robust dynamic turn-off commutation ((dl/dt)c min. 8 A/ms at Tj max). Key electrical parameters include an RMS on-state current of 8 A, non-repetitive surge peak current of 84 A, gate trigger current max of 35 mA, and gate trigger voltage max of 1.3 V. The device offers low leakage current (max 1.5 µA at 25 °C) and a typical junction-to-ambient thermal resistance of 60 °C/W.

Feature Summary

• Snubberless high temperature technology enabling direct control of hard loads without external RC snubber circuits
• Enhanced thermal management capabilities allowing for compact drive designs and heatsink size reduction
• Robust commutation performance maintaining specified turn-off and noise immunity levels up to maximum junction temperature

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
• Lighting and automation I/O control

Procurement Notes

Verify the specific ordering code against the manufacturer's official documentation to ensure correct package type and packing quantity. Confirm that the component meets required environmental standards such as ECOPACK2 compliance and UL94-V0 flammability ratings before integration into final assemblies.

Selection Notes

Select this component when designing systems requiring high noise immunity and robust commutation at elevated temperatures. Ensure the application respects the absolute maximum ratings, particularly the 8 A RMS current limit at a case temperature of 139 °C and the 800 V repetitive peak off-state voltage.

Part Context

This part belongs to the H-Series of Triacs from STMicroelectronics, specifically engineered for high-temperature applications. It is housed in a through-hole TO-220AB package with lead-free plating and halogen-free epoxy resin, distinguishing it from standard series components by its enhanced thermal and electrical robustness.

Replacement Considerations

Direct substitutes within the same family include the T835H-8G (D2PAK package) or other T835H variants with matching 8 A and 800 V ratings. Verify pinout compatibility and thermal resistance differences when replacing TO-220AB packages with surface mount alternatives.

FAQ

What is the minimum static dV/dt immunity at maximum junction temperature?

The minimum static dV/dt immunity is 2000 V/µs at a junction temperature of 150 °C.

Can this Triac operate without a snubber circuit?

Yes, based on ST Snubberless high temperature technology, it can be used without a snubber RC circuit provided the limits defined in the datasheet are respected.

What is the maximum non-repetitive surge peak on-state current?

The maximum non-repetitive surge peak on-state current is 84 A for a full cycle duration of 16.7 ms with an initial junction temperature of 25 °C.