STMicroelectronics T1250H-6T

Overview

T1250H-6T from STMicroelectronics is a 12 A, 600 V Snubberless™ triac in TO-220AB package, designed for high-temperature AC mains switching with 150 °C max junction temperature, 50 mA gate trigger current (IGT), and 1500 V/µs dV/dt immunity at Tj = 150 °C. It enables compact motor control in vacuum cleaners and washing machine drum drives by sustaining full-rated current at elevated thermal conditions without external snubbers.

For engineers reviewing the T1250H-6T datasheet, T1250H-6T pinout, T1250H-6T application, or T1250H-6T equivalent, key selection criteria include its 12 A RMS current rating at 130 °C case temperature, 126 A non-repetitive surge capability at 60 Hz, 1.4 °C/W junction-to-case thermal resistance, and verified 3-quadrant commutation performance up to 150 °C junction temperature.

Technical Context

This triac operates as a bidirectional AC switch for universal motor and resistive load control, using gate-triggered conduction in all four quadrants with guaranteed turn-off commutation at 150 °C. Its internal ceramic pad provides 2500 V_rms isolation between MT1/MT2 and the heatsink-mounting tab.

The device achieves high dV/dt immunity (1500 V/µs) and critical rate of decrease of on-state current (21 A/ms) without snubber networks, enabled by optimized silicon structure and clip-bonded die attachment that lowers thermal resistance and improves power cycling robustness.

Key Specifications

Pinout & Package

TO-220AB package with isolated mounting tab (non-insulated variant), 3-terminal configuration: MT1 (A1), MT2 (A2), Gate (G). Tab is electrically connected to MT2 (A2) and serves as primary heat path to heatsink.

Key Features

Applications

Equivalent & Alternatives

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

Compared with BTB12-600CW and Q6012LH4, T1250H-6T delivers superior thermal performance (1.4 °C/W), higher dV/dt immunity (1500 V/µs), and built-in UL-certified isolation-making it optimal for safety-compliant, space-constrained, high-temperature motor controls where reliability and certification are mandatory.

Availability

T1250H-6T is available at Aetrix Electronics and suitable for vacuum cleaner motor control, washing machine drum drives, and industrial fan speed regulation requiring stable component supply, long-term lifecycle support, and RoHS-compliant sourcing.

Supply support for T1250H-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 microcontrollers, power devices, sensors, and analog ICs for industrial, automotive, and consumer markets.

The T12xxH series belongs to ST's high-temperature Snubberless™ triac product line, engineered specifically for compact, high-efficiency AC motor control in thermally demanding white goods and power tools.

FAQ

Is T1250H-6T RoHS compliant and halogen-free?

Yes. T1250H-6T conforms to RoHS Directive 2002/95/EC and is manufactured using ST's ECOPACK®2 package standard, which specifies lead-free terminations and halogen-free epoxy molding compound. Full compliance documentation is available upon request through Aetrix Electronics' technical support portal.

What is the maximum recommended torque for mounting the TO-220AB tab?

The recommended mounting torque for the TO-220AB tab is 0.4 to 0.6 N·m. Exceeding 0.6 N·m risks cracking the package body or damaging internal wire bonds; torque below 0.4 N·m may cause inconsistent thermal contact and localized overheating at MT2. Use a calibrated torque screwdriver and thermal interface material with ≤0.25 °C·in²/W resistance.

Can T1250H-6T replace T1235H-6T in existing designs?

Yes, with functional equivalence in pinout, package, and voltage rating-but T1250H-6T has higher IGT (50 mA vs 35 mA) and improved dV/dt (1500 V/µs vs 1000 V/µs). Gate drive circuits must deliver ≥50 mA to ensure reliable triggering at 150 °C; no changes needed to heatsinking or snubber design due to identical Rth(j-c) and enhanced noise immunity.

Does T1250H-6T require a heatsink for 12 A RMS operation?

Yes. At 12 A RMS and 130 °C case temperature, junction temperature reaches 150 °C even with Rth(j-c) = 1.4 °C/W. A heatsink with Rth(c-a) ≤ 25 °C/W is required for ambient temperatures up to 50 °C. For sealed enclosures above 60 °C ambient, active cooling or derating to ≤9 A RMS is necessary to maintain Tj ≤ 150 °C.