T435-600B

Overview

The T435-600B is a Snubberless™ TRIAC from STMicroelectronics, rated for 600 V blocking voltage and 4 A RMS on-state current. It utilizes logic level technology to enable direct driving by microcontrollers or optocouplers with a maximum gate trigger current of 35 mA. The device operates within a junction temperature range of -40°C to +125°C and features a non-repetitive surge current capacity of 30 A at 50 Hz. Packaged in the DPAK (TO-252) surface-mount format, it provides high commutation performance suitable for AC inductive loads without requiring external snubber circuits.

Feature Summary

• Snubberless operation eliminates the need for external RC networks across the main terminals.
• Logic level gate sensitivity allows direct interface with standard digital control circuits.
• High static and dynamic commutation capabilities ensure reliable switching of inductive loads.

Applications

• Universal motor speed control in power tools
• Electrovalve actuation in kitchen appliances
• General purpose AC mains switching

Procurement Notes

Verify the specific ordering suffix against the manufacturer's datasheet to confirm package type and tape/reel specifications. Ensure the component meets RoHS compliance requirements for the target assembly process. Cross-reference the part number with authorized distributors to confirm availability and authenticity before finalizing procurement plans.

Selection Notes

Select this component when designing circuits that require compact surface-mount solutions for low-power AC switching. The 600 V rating suits single-phase 230 V applications. Verify that the load current does not exceed the 4 A RMS limit and that the gate drive circuit can supply the required 35 mA trigger current for reliable turn-on.

Part Context

This device belongs to the T4 Series of 4 A TRIACs developed using ST’s proprietary Snubberless technology. The series includes variants with different voltage ratings such as 700 V and 800 B versions. The T435-600B specifically targets cost-sensitive consumer electronics where board space is limited and external snubber components are undesirable.

Replacement Considerations

Direct replacements include other T435 series variants like T435-700B-TR if higher voltage blocking is acceptable. Alternative packages in the same family include the TO-220AB version (T435T-600FP) for through-hole applications. Verify pinout compatibility and thermal resistance differences when substituting between package types.

FAQ

Does the T435-600B require an external snubber circuit?

No, the device is designed with Snubberless technology, allowing it to operate reliably without external RC snubber networks across the main terminals.

What is the maximum gate trigger current for this TRIAC?

The maximum gate trigger current (Igt) is specified as 35 mA, enabling direct driving from logic-level outputs.

Is the T435-600B suitable for driving universal motors?

Yes, the datasheet explicitly recommends this component for applications involving universal motors, such as those found in power tools and kitchen aids.