STMicroelectronics BTA26-800BWRG

Overview

BTA26-800BWRG from STMicroelectronics is a 25 A, 800 V RMS snubberless triac in TOP3 insulated package, rated for 2500 VRMS insulation and designed for high-reliability AC switching in static relays, heating regulation, and motor starting circuits. It supports 3-quadrant operation with 35 mA gate trigger current (IGT), 500 V/µs dV/dt immunity at 125 °C, and junction-to-case thermal resistance of 0.9 °C/W.

For engineers reviewing the BTA26-800BWRG datasheet, BTA26-800BWRG pinout, BTA26-800BWRG application, or BTA26-800BWRG equivalent, key selection criteria include snubberless commutation capability, insulated tab rating, thermal performance under sustained 25 A conduction, and compatibility with phase-control dimming and induction motor soft-start topologies.

Technical Context

This triac operates in 3-quadrant mode (I, II, III) with snubberless turn-off capability, enabling robust commutation without external snubbers in inductive loads. Its 500 V/µs minimum dV/dt at 125 °C and 13 A/ms critical di/dt ensure reliable blocking during fast voltage transients and controlled turn-on under high-current surge conditions.

The device integrates an insulated metal tab rated for 2500 VRMS isolation, supporting safe mounting on heatsinks without additional insulation barriers. Its low Rth(j-c) = 0.9 °C/W allows direct thermal coupling to heatsinks while maintaining Tj ≤ 125 °C at full 25 A RMS conduction at Tc = 100 °C.

Key Specifications

Pinout & Package

Package: TOP3 insulated (plastic housing with electrically isolated metal tab). Dimensions per DS13701 Rev 2: 20.4–21.1 mm length × 15.1–15.5 mm width × 4.4–4.6 mm height; tab insulated per UL1557 (file 81734).

Key Features

Applications

Equivalent & Alternatives

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

Compared with BTA26-800BRG, this part offers superior snubberless reliability in motor loads; compared with BTB26-800BWRG, it delivers certified isolation for industrial safety compliance-making it optimal for UL-listed equipment where both thermal and regulatory margins matter.

Availability

BTA26-800BWRG is available at Aetrix Electronics and suitable for static relay replacement, heating regulation, and induction motor starting applications requiring stable component supply, long-term lifecycle support, and UL-compliant insulation integrity.

Supply support for BTA26-800BWRG 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 discrete triac product line, engineered specifically for robust, snubberless AC switching in safety-critical industrial controls and energy-efficient appliance power stages.

FAQ

What does "BWRG" signify in BTA26-800BWRG?

The suffix "BW" indicates snubberless 3-quadrant operation with 35 mA gate trigger current (IGT), and "RG" denotes tube packaging. This distinguishes it from "BRG" (standard 4-quadrant, 50 mA IGT) and confirms its optimized commutation behavior for inductive loads without external snubbers.

Can BTA26-800BWRG replace mechanical relays in 240 VAC, 25 A heating circuits?

Yes-it is rated for 25 A RMS at Tc = 100 °C and 800 V blocking, with UL1557 certification for 2500 VRMS insulation. Its snubberless design eliminates arcing risks, and its 250 A non-repetitive surge rating handles heater inrush currents typical in resistive load switching.

Is heatsink mounting mandatory for continuous 25 A operation?

Yes-continuous 25 A RMS conduction requires active thermal management. With Rth(j-c) = 0.9 °C/W and max Tj = 125 °C, case temperature must be held ≤100 °C; this necessitates a properly sized heatsink with thermal interface material and adequate airflow or conduction path.

Does this triac support zero-crossing switching?

No-BTA26-800BWRG is not inherently zero-crossing; it triggers on gate signal regardless of AC phase. Zero-crossing operation requires external control circuitry (e.g., opto-coupled zero-crossing detector driving the gate) to synchronize conduction onset with voltage minima.