T835T-8G

Overview

The T835T-8G is an 8 A Snubberless Triac in a D2PAK surface-mount package. It features an 800 V repetitive peak off-state voltage and a maximum junction temperature of 150 °C. Key electrical parameters include an on-state RMS current of 8 A, non-repetitive surge currents of 80 A or 84 A, and a holding current maximum of 35 mA. The device exhibits a gate trigger voltage of 1.2 V, gate trigger current of 35 mA, and an on-state voltage of 1.55 V. Leakage current at rated voltage is limited to 5 uA. Operating temperatures range from -40 °C to +125 °C.

Feature Summary

• Snubberless design allows operation without external RC snubber circuits when defined limits are respected.
• High static dV/dt provides immunity against false turn-on events.
• Enhanced dynamic turn-off commutation capability improves performance in high-temperature environments.
• Extended thermal margin supports continuous operation up to a 150 °C maximum junction temperature.

Applications

• General purpose AC switching
• Static relays
• Heating regulation systems
• Induction motor starting circuits
• Light dimmers and motor speed controllers

Procurement Notes

Verify the specific ordering suffix to confirm the packaging format, as the standard part number may correspond to tube packaging while tape-and-reel variants exist with different suffixes. Confirm RoHS compliance status and environmental declarations such as halogen-free grading before finalizing procurement specifications for assembly processes.

Selection Notes

Select this component for applications requiring high commutation capability on inductive loads without added snubber circuitry. Ensure the driving interface matches the logic level requirements, specifically verifying that the gate trigger current does not exceed the specified maximums. Evaluate thermal management strategies considering the non-insulated tab configuration inherent to the D2PAK package.

Part Context

This device belongs to the STMicroelectronics T-Series of Snubberless Triacs. It shares core technology with other variants like the T835T-8I and T835H-8I but utilizes a surface-mount D2PAK package instead of through-hole options. The series is designed to simplify AC load control by eliminating the need for external protection components typically required for high dv/dt scenarios.

Replacement Considerations

Direct functional substitutes within the same family include the T835T-8I, which offers identical electrical ratings but utilizes a TO-220AB insulated through-hole package. Designers must account for mechanical footprint differences and thermal dissipation characteristics when swapping between surface-mount and through-hole versions.

FAQ

Can the T835T-8G operate without a snubber circuit?

Yes, it is a Snubberless Triac designed to operate without an external RC snubber circuit provided the defined voltage and current limits are respected.

What is the maximum junction temperature for this component?

The maximum junction temperature (Tj) is 150 °C, allowing for extended thermal margins compared to standard 125 °C devices.

Does the T835T-8G provide electrical insulation between the tab and the terminals?

No, the D2PAK package features a non-insulated tab. Electrical isolation requires separate mounting hardware or insulating kits if connected to a heatsink.