STMicroelectronics T1235H-600TRG

Overview

T1235H-600TRG from STMicroelectronics is a 12 A, 600 V snubberless triac in TO-220AB package, designed for high-temperature AC power control in cooking appliances (ovens, hobs, electric heaters) and coffee machines. It delivers 35 mA gate trigger current, 1.55 V max on-state voltage at 17 A, and supports 145 A non-repetitive surge current at 60 Hz with 16.7 ms pulse width.

For engineers reviewing the T1235H-600TRG datasheet, T1235H-600TRG pinout, T1235H-600TRG application, or T1235H-600TRG equivalent, key selection criteria include high-temperature junction rating (150°C), snubberless commutation capability, thermal resistance (R_th(j-c) = 1.2 °C/W), and robust dV/dt immunity (300 V/µs at 150°C).

Technical Context

This triac operates in all four quadrants (I, II, III, IV) with symmetrical triggering characteristics. Its snubberless architecture eliminates external RC networks by sustaining high critical dV/dt (300 V/µs) and dI/dt (50 A/µs) without false turn-on under noisy mains conditions.

Thermal design is enabled by low junction-to-case resistance (1.2 °C/W) and rated RMS on-state current of 12 A at T_c = 135°C. The clip assembly construction enhances surge current handling up to 145 A (60 Hz, 16.7 ms), exceeding standard triac performance in hot-appliance environments.

Key Specifications

Pinout & Package

TO-220AB package with isolated tab (electrically insulated mounting surface), 3-terminal configuration, and industry-standard footprint for mechanical and thermal integration into appliance PCBs and metal chassis.

Key Features

Applications

Equivalent & Alternatives

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

Compared with BTB12-600CW and Q6012LH4, T1235H-600TRG uniquely combines snubberless operation, 150°C junction rating, and 145 A surge capability-enabling simplified, space-constrained, and thermally aggressive appliance designs without compromise.

Availability

T1235H-600TRG is available at Aetrix Electronics and suitable for oven temperature control, electric hob power regulation, coffee machine boiler control, and industrial space heater modulation requiring stable component supply across extended production lifecycles.

Supply support for T1235H-600TRG 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, delivering intelligent power, analog, MEMS, and microcontroller solutions for industrial, automotive, and consumer markets.

The T1235H series belongs to ST's high-temperature snubberless triac product line, engineered specifically for solid-state replacement of electromechanical relays in demanding white-goods and heating applications.

FAQ

What is the maximum allowable case temperature for continuous 12 A operation?

The datasheet specifies IT(RMS) = 12 A at T_c = 135°C. Operation at higher case temperatures requires linear derating per Figure 2; at 145°C case temperature, maximum RMS current drops to approximately 9.5 A. Thermal interface material and heatsink design must maintain T_c ≤135°C under worst-case ambient and airflow conditions.

Can T1235H-600TRG be used without a heatsink in low-duty-cycle applications?

No. Even at 25% duty cycle, junction temperature exceeds 150°C without heatsinking due to R_th(j-a) = 60 °C/W. A minimum heatsink with R_th(c-a) ≤ 20 °C/W is required to limit T_j to 150°C at 12 A RMS. PCB copper area alone is insufficient for sustained conduction.

Is the TO-220AB package electrically insulated?

Yes. The "T" suffix in T1235H-600T and T1235H-600TRG denotes the insulated TO-220AB variant. The metal tab is electrically isolated from A2 (MT2) with dielectric strength ≥2500 V_RMS, enabling direct mounting to grounded chassis without short-circuit risk.

Does this triac support leading-edge or trailing-edge phase control?

T1235H-600TRG supports both leading-edge (phase-angle) and trailing-edge (burst-fire) control modes. Its quadrants I/II/III/IV symmetry and 300 V/µs dV/dt immunity make it compatible with standard zero-crossing-triggered burst-fire drivers and phase-shifted gate pulse generators.