STMicroelectronics T1050H-6T

Overview

T1050H-6T from STMicroelectronics is a high-temperature, snubberless 10 A triac in TO-220AB package, designed for mains AC switching in universal motor loads. It delivers 600 V blocking voltage, 50 mA gate trigger current (IGT), 150 °C maximum junction temperature, and 1.45 °C/W junction-to-case thermal resistance - enabling compact heatsink design in vacuum cleaner and washing machine drum motor control.

For engineers reviewing the T1050H-6T datasheet, T1050H-6T pinout, T1050H-6T application, or T1050H-6T equivalent, key selection criteria include commutation robustness at 150 °C, dV/dt immunity (1500 V/µs), 3-quadrant switching capability, and insulated package variants for enhanced safety in high-density power stages.

Technical Context

This triac operates without external snubbers due to its intrinsic high dV/dt (1500 V/µs) and critical rate of decrease of main current (dI/dt)c ≥18 A/ms at 150 °C. Its internal ceramic pad provides 2500 V_rms isolation in the insulated variant, while the standard TO-220AB version maintains low R_th(j-c) = 1.45 °C/W for efficient thermal management.

The device supports full-cycle sinusoidal conduction up to 10 A RMS at T_c = 135 °C and withstands non-repetitive surge currents up to 105 A (60 Hz, 16.7 ms). Gate drive is compatible with standard microcontroller outputs via 50 mA I_GT and 1.0 V V_GT, with guaranteed turn-off commutation at 150 °C junction temperature.

Key Specifications

Pinout & Package

TO-220AB package with isolated tab (non-insulated variant); metal tab is electrically connected to MT2 (A2) terminal. Standard through-hole mounting with 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 BTB12-600BW and Q6010LH4, the T1050H-6T uniquely combines UL certification, 150 °C commutation guarantee, and snubberless operation - making it the only option qualified for thermally aggressive, safety-regulated appliance motor control.

Availability

T1050H-6T is available at Aetrix Electronics and suitable for vacuum cleaner motor control, washing machine drum motor drives, and industrial fan controllers requiring stable component supply across multi-year production programs.

Supply support for T1050H-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, designing and manufacturing analog, power, MCU, and sensor solutions for industrial, automotive, and consumer markets.

The T10xxH series belongs to ST's high-temperature triac product line, engineered specifically for compact, high-power-density AC motor control in white goods and power tools where thermal resilience and safety compliance are critical.

FAQ

What is the maximum allowable case temperature for continuous 10 A RMS operation?

The T1050H-6T supports 10 A RMS continuous conduction at T_c = 135 °C, as specified in Table 2. Operation above this temperature requires current derating per Figure 2; at T_c = 150 °C, maximum IT(RMS) drops to approximately 8.5 A. Thermal design must ensure case temperature remains within this limit under worst-case ambient and airflow conditions.

Does the T1050H-6T require a heatsink in typical vacuum cleaner applications?

Yes - a heatsink is mandatory. With R_th(j-c) = 1.45 °C/W and P_D ≈ 1.5 W at 10 A RMS (VT ≈ 1.5 V), junction temperature rise exceeds safe limits without thermal management. A 5–10 °C/W heatsink (with thermal interface) is typical for 230 VAC motor loads running intermittently at full power.

Can the T1050H-6T replace the T1035H-6T in existing designs?

Yes, with functional improvement: both share identical package, voltage rating, and thermal specs, but T1050H offers higher I_GT (50 mA vs. 35 mA), improving noise immunity and gate drive margin. No layout or firmware changes are required, though gate resistor values may be adjusted to optimize trigger energy.

Is the TO-220AB tab electrically isolated in the T1050H-6T variant?

No - the T1050H-6T uses standard TO-220AB with electrically connected tab (MT2/A2). For isolation, select T1050H-6I (TO-220AB Insulated), which integrates a ceramic pad rated for 2500 V_rms. The -6T variant requires proper creepage/clearance design if the heatsink is grounded or at different potential.