STMicroelectronics T1235H-600G-TR

Overview

T1235H-600G-TR from STMicroelectronics is a snubberless 12 A, 600 V high-temperature triac in D2PAK (TO-263) package, designed for phase-controlled AC power switching in hot-appliance environments (ovens, hobs, electric heaters). It delivers 35 mA gate trigger current, 1.55 V on-state voltage at 17 A, and 1.2 °C/W junction-to-case thermal resistance - enabling compact heatsink design in space-constrained thermal systems.

For engineers reviewing the T1235H-600G-TR datasheet, T1235H-600G-TR pinout, T1235H-600G-TR application, or T1235H-600G-TR equivalent, key selection criteria include its 140 A non-repetitive surge rating at 50 Hz, 300 V/µs dV/dt immunity at 150°C, 50 A/µs critical dI/dt, and clip-assembled construction for robust transient handling in mains-connected heating control circuits.

Technical Context

This triac operates in all four quadrants with guaranteed triggering up to 35 mA IGT across QI–QIII, and features a 0.80 V threshold voltage and 25 mΩ dynamic resistance at 150°C - ensuring stable turn-on under elevated junction temperatures. Its snubberless architecture eliminates external RC networks while maintaining ≥300 V/µs commutation immunity even at Tj = 150°C.

The device uses ST's proprietary clip-bond assembly for superior surge current capability (145 A at 60 Hz, 16.7 ms), and integrates ECOPACK® lead-free interconnects compliant with JEDEC JESD97. Thermal performance is characterized by Rth(j-c) = 1.2 °C/W (D2PAK), supporting continuous 12 A RMS conduction at Tc = 135°C.

Key Specifications

Pinout & Package

Package: D2PAK (TO-263), surface-mount with isolated tab (pin 3), RoHS-compliant ECOPACK® lead-free finish.

Key Features

Applications

Equivalent & Alternatives

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

Compared with BTB12-600CW and MAC12N60G, T1235H-600G-TR offers superior thermal performance (1.2 vs. 1.5 °C/W), higher noise immunity (300 vs. 100 V/µs), and verified snubberless operation - making it the optimal choice for thermally demanding, high-reliability heating applications.

Availability

T1235H-600G-TR is available at Aetrix Electronics and suitable for electric ovens, induction hobs, commercial coffee machines, and industrial space heaters requiring stable component supply across extended product lifecycles.

Supply support for T1235H-600G-TR 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 microcontroller technologies for industrial, automotive, and consumer markets.

The T1235H series belongs to ST's high-temperature triac portfolio, engineered specifically for solid-state replacement of electromechanical relays in thermally aggressive household and industrial heating appliances.

FAQ

What is the maximum allowable junction temperature for continuous operation?

The T1235H-600G-TR is rated for continuous operation up to Tj = 150°C, with absolute maximum storage and operating junction temperature specified from –40°C to +150°C. Derating begins above Tc = 135°C, and thermal design must ensure junction temperature remains within this limit under worst-case load and ambient conditions.

Is a heatsink required for 12 A RMS operation?

Yes - a heatsink is mandatory. At 12 A RMS and Tc = 135°C, the device dissipates ~18.6 W (based on VT = 1.55 V and Rd = 25 mΩ). With Rth(j-c) = 1.2 °C/W, a heatsink with Rth(c-a) ≤ 5.5 °C/W is required to maintain Tj ≤ 150°C in still air; PCB copper area alone is insufficient.

Can this triac replace a mechanical relay in a 2.4 kW heater circuit?

Yes - it is qualified for this use. At 230 VAC, 2.4 kW draws ~10.4 A RMS, well within the 12 A rating. Its 140 A surge capability handles cold-resistance inrush, and snubberless operation eliminates relay contact arcing failure modes. Safety isolation and creepage/clearance must be maintained per IEC 60335.

Does the "-TR" suffix indicate tape-and-reel packaging only?

Yes - the "-TR" suffix denotes tape-and-reel packaging (1000 units per reel), as confirmed in Table 8. The base part T1235H-600G is supplied in tubes (50 units), while T1235H-600G-TR is identical electrically and mechanically but optimized for automated SMT placement via 12 mm carrier tape with 8 mm pocket pitch and embossed cover tape.