T835T-8I

Overview

The T835T-8I is an 8 A Snubberless™ Triac designed for general-purpose AC switching applications requiring high commutation capability. It supports on/off or phase angle control functions and operates without a snubber RC circuit when defined limits are respected. The device features a TO-220AB insulated package with built-in ceramic tab insulation, UL1557 certified at 2.5 kV RMS. Key electrical parameters include an 8 A on-state RMS current (It RMS), 60 A non-repetitive peak on-state current, and an 800 V rated repetitive off-state voltage (VDRM). It maintains a maximum holding current of 40 mA, a gate trigger voltage of 1.3 V, and a gate trigger current of 35 mA. The component withstands surge voltages up to 900 V and operates within a temperature range of -40 °C to +150 °C.

Feature Summary

• Snubberless operation enabled by high static dV/dt and dynamic commutation performance
• Integrated ceramic pad providing UL1557 certified 2.5 kV RMS tab insulation
• Three-quadrant triggering capability for versatile gate drive interfaces
• Ecopack®2 compliant packaging ensuring RoHS and halogen-free compliance

Applications

• General purpose AC switching in home appliances
• Induction motor starting circuits
• Heating regulation systems
• Light dimmers and motor speed controllers

Procurement Notes

Verify the specific ordering suffix to confirm package type and insulation rating. The T835T-8I designation corresponds to the through-hole TO-220AB insulated variant. Confirm that the application design respects the specified snubberless limits to ensure reliable operation without external RC circuits. Check for updated environmental compliance documentation such as Ecopack®2 status before finalizing procurement.

Selection Notes

Select this component for designs requiring high commutation capability on inductive loads without adding external snubber networks. The insulated TO-220AB package is suitable for applications needing galvanic isolation between the heatsink and the device terminals. Ensure the gate driver can supply the required 35 mA trigger current. Consider the 150 °C maximum junction temperature for thermal management in compact enclosures.

Part Context

The T835T-8I belongs to STMicroelectronics' T835 series of Snubberless™ Triacs. This family includes surface-mount variants like the T835T-8G and other through-hole options. The series is engineered for high noise immunity and improved turn-off performance in demanding environments. The 'T' suffix typically indicates the through-hole package configuration within this product line.

Replacement Considerations

Direct substitutes within the same series include the T835T-8G for surface-mount applications, though package differences must be accounted for. Other variants in the T835 family may offer different voltage ratings or current capacities. Verify pinout compatibility and insulation requirements when considering alternative part numbers from the same manufacturer.