T435-800W

Overview

The T435-800W is a four-quadrant Snubberless Triac manufactured by STMicroelectronics, rated for 800 V repetitive peak off-state voltage and 4 A RMS on-state current. It utilizes logic-level gate technology to facilitate direct interfacing with microcontrollers or optocouplers without requiring external snubber circuits under specified conditions. The device operates within a junction temperature range of -40°C to +125°C and is housed in a TO-220AB insulated package. Key electrical parameters include a maximum gate trigger current of 35 mA and a holding current of 35 mA.

Feature Summary

• Snubberless operation capability reduces component count in AC switching applications
• Logic-level gate sensitivity enables direct drive from standard digital interfaces
• Insulated TO-220AB package provides enhanced thermal management and electrical isolation

Applications

• AC motor speed control for household appliances
• Solid-state relay modules
• Lighting dimmer circuits

Procurement Notes

Verify the specific suffix 'W' against official STMicroelectronics documentation to confirm exact pinout configuration and insulation specifications. Ensure the selected variant matches the required thermal resistance and voltage ratings for the target application environment before finalizing procurement.

Selection Notes

Select this component when designing AC load controllers that require high dv/dt immunity and simplified circuit topology. The Snubberless feature allows for cost reduction by eliminating external RC networks. Confirm that the 4A current rating and 800V blocking voltage exceed the maximum expected load requirements and line transients.

Part Context

This part belongs to the T4 series of Snubberless Triacs, designed for general-purpose AC switching. The series leverages ST's proprietary technology to provide high commutation performance and noise immunity, making it suitable for driving inductive loads such as motors and solenoids in residential and industrial equipment.

Replacement Considerations

Direct replacements must match the 800V/4A rating and Snubberless characteristics. Verify pin compatibility if substituting with other TO-220 packages. Consult ST datasheets for equivalent parts within the T4 or T6 series that offer similar thermal and electrical profiles.