T435-800H

Overview

The T435-800H is a Snubberless™ TRIAC from STMicroelectronics, rated for 800 V blocking voltage and 4 A RMS on-state current. It utilizes logic-level technology to eliminate the need for external snubber circuits in AC inductive load applications. The device operates within a junction temperature range of -40°C to 125°C and is housed in a TO-251 (IPAK) through-hole package. Key electrical parameters include a maximum gate trigger current of 35 mA, a maximum gate trigger voltage of 1.3 V, and a holding current of 35 mA. Non-repetitive surge currents are specified at 30 A for 50 Hz and 31 A for 60 Hz frequencies.

Feature Summary

• Snubberless design enables direct switching of AC inductive loads without external RC circuits
• Logic-level gate drive compatibility simplifies control interface requirements
• High commutation performance ensures reliable operation with universal motors

Applications

• Universal motor speed control
• Electro valve actuation
• Kitchen appliance power regulation
• Power tool switching

Procurement Notes

Verify component authenticity by cross-referencing the manufacturer part number T435-800H with official STMicroelectronics documentation. Confirm the specific ordering suffix matches the required packaging configuration. Ensure compliance with RoHS3 standards and check for any recent product change notifications that may affect pinout or thermal characteristics before finalizing procurement orders.

Selection Notes

Select this component when designing AC switches for inductive loads requiring 800 V blocking capability and 4 A continuous current. The TO-251 IPAK package suits applications needing through-hole mounting with moderate thermal dissipation. Verify that the load's dV/dt and di/dt requirements remain within the device's snubberless limits to prevent false triggering or commutation failure during high-speed switching events.

Part Context

This device belongs to the T4 series of TRIACs, which are engineered for general-purpose AC switching. The T435 variant specifically addresses compact module designs where space constraints limit the inclusion of external snubber networks. It shares the Snubberless™ technology family with higher-current counterparts like the T835 and T2035, offering consistent noise immunity across the series.

Replacement Considerations

Direct replacements must match the 800 V rating, 4 A current capacity, and TO-251 IPAK package. Consider the T435-800G if surface-mount D2PAK packaging is preferred, provided thermal resistance differences are accounted for. Verify that substitute parts maintain identical gate trigger specifications to ensure circuit compatibility.