T835H-8I

Overview

The T835H-8I is an 8 A medium current Triac housed in a TO-220AB insulated package, designed for operation at 800 V and up to 150 °C junction temperature. It features Snubberless technology providing high static dV/dt immunity (min 2000 V/µs) and robust dynamic turn-off commutation ((dl/dt)c min 8 A/ms). The device supports three triggering quadrants with a gate trigger current of 35 mA max. Electrical characteristics include a repetitive peak off-state voltage of 800 V, non-repetitive surge peak on-state current of 84 A, and insulation rated at 2500 VRMS via an internal ceramic pad.

Feature Summary

• High noise immunity and robust dynamic commutation enabled by ST high temperature Snubberless technology
• Enhanced thermal management through TO-220AB insulated package allowing heatsink size reduction
• Built-in voltage insulation rated at 2500 VRMS using an internal ceramic pad
• UL recognized for insulation compliance with UL1557 standard

Applications

• General purpose AC line load control
• AC induction and universal motor control
• Lighting and automation I/O control
• Water heater, room heater and coffee machine
• Home automation smart AC plug
• Inrush current limiter in AC DC rectifiers

Procurement Notes

Verify the specific ordering code T835H-8I against the manufacturer's latest datasheet DS13573 Rev 3 before procurement. Confirm that the TO-220AB Insulated package variant matches the required thermal and electrical specifications for the application environment. Ensure compatibility with the recommended mounting torque of 0.4 to 0.6 N·m during assembly.

Selection Notes

Select this component when high commutation capability is required without external snubber circuits. The insulated package is suitable for applications needing galvanic isolation between the tab and the circuit ground. Consider the 150 °C maximum junction temperature for high-temperature environments where standard triacs might fail. Verify that the 8 A RMS current rating meets the continuous load requirements.

Part Context

The T835H-8I belongs to the T835 series of Snubberless Triacs from STMicroelectronics. This series includes variants in different packages such as DPAK, D2PAK, and TO-220AB. The 'H' suffix denotes high noise immunity and robust commutations, while '8' indicates the 800 V blocking voltage and 8 A current rating. It is part of the broader family of general-purpose AC switching devices optimized for home appliances and industrial control.

Replacement Considerations

Direct substitutes within the same series include other T835 variants with different voltage or current ratings, such as T835T-8I for non-insulated TO-220AB applications. Cross-family replacements should be evaluated based on matching IT(RMS), VDRM, and package dimensions. Always verify pinout compatibility and thermal resistance values when substituting.