STMicroelectronics T2535T-8T

Overview

T2535T-8T from STMicroelectronics is a 25 A, 800 V RMS snubberless triac in TO-220AB package, designed for phase-angle and on/off AC line switching in high-temperature home appliance motor and heater control. It delivers 900 V non-repetitive surge capability, 150 °C junction rating, and 35 mA max gate trigger current with three-quadrant triggering.

For engineers reviewing the T2535T-8T datasheet, T2535T-8T pinout, T2535T-8T application, or T2535T-8T equivalent, key selection criteria include dV/dt immunity (≥1000 V/µs at 150 °C), commutation robustness (≥18 A/ms at 150 °C), thermal resistance (1 °C/W j-c), and ECOPACK2 compliance for industrial-grade reliability.

Technical Context

This triac implements ST's Snubberless technology to eliminate external snubbers in demanding AC load switching. Its static dV/dt immunity (1000–1500 V/µs) and dynamic (dI/dt)_c rating (18–28 A/ms) enable stable operation under fast voltage transients and high-current turn-off stress without oscillation or false triggering.

The device supports full-cycle conduction up to 25 A RMS at T_c = 121 °C and maintains low on-state voltage (V_TM ≤ 1.5 V @ 35 A, 25 °C; V_TO ≤ 0.80 V @ 150 °C) with dynamic resistance ≤17 mΩ - critical for thermal management in compact, sealed appliances.

Key Specifications

Pinout & Package

TO-220AB package: insulated metal tab (A2), center lead (A1), right lead (G); case serves as A2 terminal; requires 0.4–0.6 N·m mounting torque; halogen-free, lead-free, UL94 V0 compliant.

Key Features

Applications

Equivalent & Alternatives

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

Compared with BTB24-800CW and Q6025LH4, the T2535T-8T provides superior high-temperature stability (150 °C), higher surge voltage rating (900 V), and broader three-quadrant triggering - making it optimal for next-generation, compact, and thermally constrained home appliance designs.

Availability

T2535T-8T is available at Aetrix Electronics and suitable for water heater control, e-bidet heating systems, and universal motor speed regulation requiring stable component supply across extended production lifecycles.

Supply support for T2535T-8T 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 automotive, industrial, and consumer markets.

The T-series triac product line targets high-reliability AC power control in home appliances, emphasizing snubberless operation, high-temperature resilience, and noise immunity for sealed, fanless, and compact designs.

FAQ

What is the maximum recommended case temperature for continuous 25 A RMS operation?

The datasheet specifies 25 A RMS operation at T_c = 121 °C (Figure 2). Exceeding this case temperature requires derating - for example, at T_c = 100 °C, maximum IT(RMS) drops to ~21 A. Thermal design must ensure heatsink interface resistance and ambient conditions maintain case temperature within limits.

Can the T2535T-8T replace a standard 25 A triac in an existing design without layout changes?

Yes - it uses the industry-standard TO-220AB footprint and pinout (A2-tab, A1-center, G-right). However, verify gate drive strength (≤35 mA IGT), confirm heatsink isolation (A2 is electrically connected to the tab), and validate snubber removal if previously used - its Snubberless design eliminates that requirement.

Does the T2535T-8T support zero-crossing switching?

No - it is not a zero-crossing triac. It is a random-phase device optimized for phase-angle control. Zero-crossing operation requires external timing circuitry (e.g., microcontroller + zero-crossing detector) to gate-trigger precisely at voltage zero crossings.

Is the TO-220AB package electrically insulated?

No - the metal tab is internally connected to A2 and is not electrically isolated. When mounted to a heatsink, use an insulating washer and bushing (e.g., silicone pad + shoulder washer) unless the heatsink is referenced to A2 potential. Electrical isolation must be verified per IEC 60335-1 for appliance safety.