STMicroelectronics T2035H-6T

Overview

T2035H-6T from STMicroelectronics is a 20 A, 600 V snubberless triac in TO-220AB package, designed for mains AC switching in universal motor control. It delivers 1000 V/µs dV/dt immunity at 150 °C junction temperature, supports 3-quadrant commutation, and features insulated case (2500 VRMS isolation) with 1.0 °C/W junction-to-case thermal resistance.

For engineers reviewing the T2035H-6T datasheet, T2035H-6T pinout, T2035H-6T application, or T2035H-6T equivalent, this device is selected for high-density motor drives requiring robust turn-off commutation, reduced heatsink sizing, and RoHS-compliant through-hole power switching at 150 °C maximum junction temperature.

Technical Context

This triac uses a planar passivated silicon structure optimized for high dV/dt and dl/dt immunity without external snubbers. Its gate trigger sensitivity is specified at 35 mA max (Quadrants I, II, III), with guaranteed turn-on at 20% of that value, enabling reliable firing under varying load conditions.

Thermal performance is defined by Rth(j-c) = 1.0 °C/W (TO-220AB), allowing 20 A RMS conduction at Tc = 128 °C. The internal ceramic insulation enables safe operation in grounded-heatsink configurations, critical for appliance motor control where chassis grounding is mandatory.

Key Specifications

Pinout & Package

TO-220AB package with insulated tab (2500 VRMS isolation), 3-pin through-hole mounting, standard lead pitch (2.54 mm), and recommended 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 switching applications.

Compared with T2035H-6I, the -6T offers lower thermal resistance for denser packaging; compared with T2050H-6T, it provides easier gate drive compatibility while maintaining identical blocking and conduction performance.

Availability

T2035H-6T is available at Aetrix Electronics and suitable for vacuum cleaner motor control, washing machine drum drives, and power tool speed regulators requiring stable component supply across high-volume consumer appliance production.

Supply support for T2035H-6T 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, analog, MEMS, and microcontroller technologies for industrial and consumer applications.

This part belongs to ST's H-series snubberless triac product line, engineered specifically for high-reliability, high-power-density AC motor control in cost-sensitive white goods and power tools.

FAQ

What is the maximum junction temperature and how does it affect thermal design?

The T2035H-6T is rated for continuous operation up to 150 °C junction temperature. At this limit, its dV/dt immunity remains 1000 V/µs and (dl/dt)c stays at 27 A/ms. Thermal design must ensure Rth(j-a) ≤ 45 °C/W with 2 cm² copper pad to sustain 20 A RMS at ambient temperatures up to 70 °C, per Figure 2 and Table 4.

Can this triac be triggered directly from a 3.3 V microcontroller GPIO?

No - the gate trigger current requirement is 35 mA max at 12 V, so a 3.3 V GPIO cannot provide sufficient voltage or current. A driver stage (e.g., MMBT3904 NPN with 1 kΩ base resistor) or dedicated triac driver IC (e.g., MOC3021 optocoupler) is required to meet the 12 V/35 mA gate pulse specification under all temperature and load conditions.

Is the TO-220AB tab electrically isolated in the T2035H-6T variant?

No - the T2035H-6T has a non-insulated TO-220AB package. The tab is internally connected to A2 (MT2). For isolated mounting, use T2035H-6I (insulated TO-220AB) or T2035H-6G (D²PAK with isolated pad). The -6T requires insulating shoulder washer and bushing when mounted to grounded heatsinks.

How does the 3-quadrant operation improve motor control performance?

3-quadrant operation (I, II, III) enables reliable triggering during negative half-cycles with positive gate pulses, supporting asymmetrical phase-control waveforms essential for universal motor speed regulation. This avoids quadrant IV limitations seen in standard triacs, reducing torque ripple and audible noise in brushed motors under variable loads.