STMicroelectronics T2035H-8T

Overview

T2035H-8T from STMicroelectronics is a 20 A, 800 V RMS-rated snubberless triac in TO-220AB package, designed for high-temperature operation up to 150 °C junction temperature. It supports three-quadrant triggering, delivers 2000 V/µs static dV/dt immunity at Tj = 150 °C, and provides robust commutation with (dl/dt)c ≥ 20 A/ms - enabling reliable control of universal motors, heaters, and inductive AC loads in compact home appliance and industrial drive designs.

For engineers reviewing the T2035H-8T datasheet, T2035H-8T pinout, T2035H-8T application, or T2035H-8T equivalent, key selection criteria include its 800 V blocking voltage, 35 mA max gate trigger current, 1.0 °C/W junction-to-case thermal resistance, high-noise-immunity gate structure, and ECOPACK2-compliant TO-220AB packaging for thermally demanding AC line switching.

Technical Context

This triac implements ST's Snubberless high-temperature technology, enabling stable operation without external snubbers across full temperature range (–40 °C to +150 °C). Its three-quadrant triggering capability reduces gate drive complexity while maintaining high noise immunity via elevated dV/dt threshold and optimized gate sensitivity.

The device achieves enhanced dynamic turn-off performance through controlled carrier lifetime design, delivering minimum (dl/dt)c of 20 A/ms at 150 °C - critical for commutating highly inductive universal motor windings and resistive heater loads under zero-crossing or phase-angle control schemes.

Key Specifications

Pinout & Package

TO-220AB package with isolated mounting tab (A2), standard lead configuration, and halogen-free, lead-free plating compliant with ECOPACK2 environmental standards. Recommended mounting torque: 0.4–0.6 N·m.

Key Features

Applications

Equivalent & Alternatives

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

Compared with BTB20-800CW and Q6025LH5, the T2035H-8T uniquely combines 800 V blocking, 150 °C operation, snubberless (dl/dt)c ≥ 20 A/ms, and 2000 V/µs dV/dt - making it the only option qualified for thermally constrained, noise-prone universal motor and heater control in sealed enclosures.

Availability

T2035H-8T is available at Aetrix Electronics and suitable for home automation smart plugs, water heater power stages, and universal motor speed controllers requiring stable component supply across extended product lifecycles.

Supply support for T2035H-8T 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, specializing in power management, analog, MEMS, and microcontrollers for industrial, automotive, and consumer markets.

The T2035H-8T belongs to ST's high-temperature snubberless triac product line, engineered specifically for compact, thermally demanding AC load control in home appliances and industrial equipment where reliability at 150 °C is mandatory.

FAQ

Is T2035H-8T compatible with zero-crossing optocouplers like MOC3041?

Yes - the T2035H-8T's 35 mA maximum gate trigger current and three-quadrant operation ensure reliable triggering from standard zero-crossing optocouplers. Its high dV/dt immunity prevents false triggering during line transitions, unlike conventional triacs requiring snubbers or gate clamping.

What is the minimum heatsink requirement for continuous 20 A operation?

At Tc = 128 °C, the device dissipates ~1.55 V × 20 A ≈ 31 W. With Rth(j-c) = 1.0 °C/W, a heatsink with Rth(c-a) ≤ 15 °C/W is required for Ta = 50 °C ambient - achievable with a 15 cm² aluminum finned heatsink or equivalent thermal interface solution.

Can T2035H-8T replace older T2035-800 triacs in existing designs?

Yes - it is a direct drop-in replacement with identical pinout, voltage/current ratings, and improved specs: higher dV/dt (2000 vs. 1000 V/µs), guaranteed (dl/dt)c, and 150 °C rating versus 125 °C. No layout or firmware changes are needed; benefits include reduced snubber dependency and extended thermal margin.

Does T2035H-8T require a gate resistor? If so, what value?

A gate resistor is recommended to limit peak gate current and improve noise immunity. For standard optocoupler drivers (e.g., MOC3021), a 330 Ω series resistor limits IGT to <35 mA while providing adequate transient suppression. Lower values (180–220 Ω) may be used with high-current drivers to ensure margin at low temperatures.