STMicroelectronics BTA26-600BWRG

Overview

BTA26-600BWRG from STMicroelectronics is a 25 A, 600 V RMS snubberless triac in TOP3 insulated package, rated for 2500 VRMS insulation, with 35 mA gate trigger current (IGT) and 50 A/µs critical di/dt. It supports 3-quadrant phase control in motor speed controllers and light dimmers, and delivers low thermal resistance (Rth(j-c) = 0.9 °C/W) for high-reliability AC switching.

For engineers reviewing the BTA26-600BWRG datasheet, BTA26-600BWRG pinout, BTA26-600BWRG application, or BTA26-600BWRG equivalent, key selection criteria include snubberless commutation capability, 2500 VRMS isolation rating, 600 V blocking voltage, 25 A RMS current handling, and compatibility with standard TO-220–derived mounting in static relays and heating regulation circuits.

Technical Context

This triac operates in 3-quadrant mode with snubberless commutation, enabling robust turn-off without external snubbers under inductive loads. Its gate trigger threshold (VGT ≤ 1.3 V) and low holding current (IH ≤ 50 mA at 25 °C) support reliable low-power drive from microcontrollers and optocouplers.

Thermal performance is defined by junction-to-case resistance of 0.9 °C/W and operating junction temperature range of –40 to +125 °C. The device sustains 260 A non-repetitive surge current (60 Hz, 16.7 ms) and withstands 500 V/µs dV/dt at 125 °C - critical for noise-immune operation in industrial AC line environments.

Key Specifications

Pinout & Package

Package: TOP3 insulated (epoxy-insulated tab, UL94 V0, lead-free, torque max 1.2 N·m). Dimensions: 20.4–21.1 mm (L) × 15.1–15.5 mm (W) × 4.4–4.6 mm (H); tab electrically isolated at 2500 VRMS.

Key Features

Applications

Equivalent & Alternatives

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

Compared with BTB26-600BRG, BTA26-600BWRG trades thermal advantage for built-in safety isolation; compared with BTA26-600CWRG, it offers identical isolation and voltage rating but requires slightly higher gate current - making it optimal for legacy 5 V control systems with robust drive capability.

Availability

BTA26-600BWRG is available at Aetrix Electronics and suitable for heating regulation, light dimming, induction motor starting, and static relay applications requiring stable component supply, UL recognition, and reinforced insulation integrity.

Supply support for BTA26-600BWRG 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.

BTA26 belongs to ST's high-power triac product line, engineered specifically for robust, isolated AC switching in safety-critical industrial controls, HVAC systems, and appliance power stages.

FAQ

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

The BTA26-600BWRG supports 25 A RMS continuous conduction at Tc = 100 °C, as specified in Absolute Maximum Ratings Table 1. Operation above this temperature requires derating per Figure 2 in DS13701, where IT(RMS) drops to ~20 A at Tc = 110 °C. Heatsink design must maintain case temperature ≤100 °C under full load.

Can this triac be used in 4-quadrant standard commutation mode?

No - BTA26-600BWRG is configured for snubberless 3-quadrant operation only (quadrants I, II, III), with guaranteed IGT = 35 mA. The "BW" suffix denotes snubberless variant; 4-quadrant operation requires "BR" or "B" suffix parts (e.g., BTA26-600BRG) with IGT = 50 mA and different gate sensitivity characteristics.

Is the insulated tab rated for direct PCB mounting without additional insulation?

Yes - the TOP3 insulated package provides 2500 VRMS isolation between the metal tab and all internal terminals (A1, A2, G), verified per UL 1557 (file 81734). Direct mounting to grounded heatsinks or chassis is permitted without supplemental insulating hardware, provided creepage distances meet end-equipment standards.

What is the recommended gate drive circuit for microcontroller interfacing?

A series resistor of 100 Ω to 220 Ω is recommended between a 5 V MCU GPIO and the gate, delivering ≥35 mA peak pulse (per IGT spec) while limiting PG(AV) to ≤1 W. For 3.3 V systems, BTA26-600CWRG (35 mA IGT) or optocoupler-driven gate (e.g., MOC3021) is preferred to ensure reliable triggering across temperature and unit variation.