STMicroelectronics T435-600W

Overview

T435-600W from STMicroelectronics is a 4 A, 600 V snubberless three-quadrant triac optimized for AC inductive load switching. It features 35 mA maximum gate trigger current (IGT), 50 A/µs critical dI/dt, and 400 V/µs commutation dV/dt - enabling robust turn-on under high-noise motor control conditions without external snubbers. Used in universal motor drives for power tools and dishwashers.

For engineers reviewing the T435-600W datasheet, T435-600W pinout, T435-600W application, or T435-600W equivalent, key selection criteria include snubberless commutation capability, 600 V blocking voltage, 4 A RMS current rating, thermal resistance (R_th(j-c) = 2.6 °C/W), and DPAK package compatibility with FR4 PCB layouts.

Technical Context

The T435-600W employs ST's Snubberless logic-level triac architecture, supporting reliable triggering across quadrants I, II, and III with minimal gate drive. Its 400 V/µs dV/dt rating at 125 °C and 50 A/µs dI/dt ensure immunity to false turn-on during fast transients in inductive circuits.

Designed for zero-crossing or phase-control AC switching, it delivers 1.56 V max on-state voltage (V_TM) at 5.5 A and maintains stable latching (I_L ≤ 50 mA) and holding (I_H ≤ 35 mA) currents over –40 to +125 °C junction temperature range.

Key Specifications

Pinout & Package

Supplied in DPAK (TO-252) package with isolated tab, compliant with UL94 V0 epoxy and lead-free finish. Thermal pad requires soldered copper area ≥4 cm² on FR4 for rated 4 A performance.

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar triac-based AC switching applications.

Compared with BTB16-600CW, T435-600W offers superior board-level integration via snubberless operation and smaller DPAK footprint, while T435-600B provides identical functionality in tape-and-reel format - making T435-600W optimal for space-constrained, noise-immune consumer appliance designs.

Availability

T435-600W is available at Aetrix Electronics and suitable for power tools, dishwashers, kitchen aid equipment, and electrovalve control requiring stable component supply across high-volume consumer appliance production.

Supply support for T435-600W includes scheduled delivery planning, volume procurement assistance, BOM continuity management, traceable sourcing, and lifecycle availability coordination for OEM customers, industrial embedded developers, connected-device designers, and electronics production programs.

Manufacturer

STMicroelectronics is a global semiconductor leader headquartered in Geneva, Switzerland, designing and manufacturing analog, power, microcontroller, and sensor solutions for industrial, automotive, and consumer markets.

The T4 series triacs were developed specifically for snubberless AC inductive load control - targeting cost-sensitive, high-reliability applications like universal motor drives and home appliance power stages.

FAQ

Is T435-600W compatible with zero-crossing trigger circuits?

Yes - T435-600W supports zero-crossing operation due to its three-quadrant structure and guaranteed triggering at low dV/dt. When paired with a zero-crossing optocoupler (e.g., MOC3041), it ensures clean turn-on at voltage minima, minimizing EMI and inrush stress on loads like heating elements and solenoids.

What is the minimum gate pulse width required for reliable triggering?

ST specifies a minimum gate pulse width of 10 µs for guaranteed turn-on across all quadrants. For robust operation under worst-case conditions (e.g., low junction temperature or high line impedance), a 50–100 µs pulse is recommended - achievable with standard MCU GPIO or optocoupler drivers without external timing circuitry.

Can T435-600W replace a mechanical relay in 230 VAC, 3 A resistive load applications?

Yes - with 600 V blocking voltage and 4 A RMS rating, T435-600W exceeds requirements for 230 VAC/3 A loads. Its solid-state switching eliminates contact wear, bounce, and audible noise, while the DPAK package enables surface-mount assembly and better thermal coupling than through-hole relays.

Does T435-600W require a heatsink in a 4 A continuous application?

Yes - at 4 A RMS, power dissipation reaches ~6.2 W (based on V_TM = 1.56 V). With R_th(j-c) = 2.6 °C/W and ambient at 50 °C, a heatsink maintaining case temperature ≤83 °C is required. A 10 cm² copper pour on 2-oz FR4 suffices for intermittent duty; forced-air or extruded aluminum is needed for continuous operation.