STMicroelectronics BTB26-600BRG

Overview

BTB26-600BRG from STMicroelectronics is a 25 A, 600 V RMS snubberless triac in TOP3 non-insulated package, rated for 4-quadrant triggering with 50 mA gate trigger current (IGT), designed for phase-controlled AC switching in motor speed controllers and light dimmers.

For engineers reviewing the BTB26-600BRG datasheet, BTB26-600BRG pinout, BTB26-600BRG application, or BTB26-600BRG equivalent, key selection criteria include dV/dt immunity (≥1000 V/µs at Tj = 125 °C), thermal resistance (Rth(j–c) = 0.6 °C/W), I²t rating (340 A²s), and UL 1557 recognition (file #81734).

Technical Context

This triac supports both standard (4-quadrant) and snubberless (3-quadrant) commutation modes, with guaranteed turn-off capability under high dI/dt stress (≥22 A/ms at Tj = 125 °C). Its low Rth(j–c) of 0.6 °C/W enables high-current operation up to 25 A RMS at TC = 105 °C without forced cooling.

The device features enhanced dV/dt immunity (1000 V/µs min. in snubberless mode), robust gate sensitivity (IGT ≤ 50 mA), and on-state voltage as low as 0.85 V at Tj = 125 °C - critical for minimizing conduction losses in heating and motor control circuits.

Key Specifications

Pinout & Package

BTB26-600BRG uses the TOP3 non-insulated package (21.1 × 15.5 × 4.6 mm), with metal tab electrically connected to MT2 (A2) terminal. The case serves as the main current path and thermal interface - no isolation barrier between tab and A2.

Key Features

Applications

Equivalent & Alternatives

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

Compared with BTA26-600BRG, BTB26-600BRG offers superior thermal performance (0.6 vs. 0.9 °C/W) at the cost of electrical isolation; versus BTB26-600BWRG, it trades higher IGT for greater dV/dt robustness - critical in unfiltered industrial AC lines.

Availability

BTB26-600BRG is available at Aetrix Electronics and suitable for light dimming systems, motor speed controllers, heating regulation circuits, and static relay replacements requiring stable component supply and long-term industrial availability.

Supply support for BTB26-600BRG 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, microcontroller, and sensor solutions for industrial, automotive, and consumer markets.

BTB26 belongs to ST's high-power triac product line, engineered specifically for robust, high-efficiency AC power control in cost-sensitive industrial and appliance applications - emphasizing thermal performance, safety compliance, and snubberless operation.

FAQ

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

BTB26-600BRG supports 25 A RMS continuous conduction at TC = 105 °C, as specified in Table 1 of DS13701 Rev 2. Exceeding this temperature requires derating per Figure 2; operation above 105 °C risks exceeding the 125 °C maximum junction temperature limit under worst-case thermal conditions.

Is a heatsink required, and what thermal interface material is recommended?

Yes - a heatsink is mandatory for any sustained current >5 A. ST recommends mounting with thermal grease (e.g., Dow Corning TC-5022) and torque ≤1.2 N·m. The non-insulated tab must be electrically isolated from chassis ground unless circuit topology permits direct connection to A2 potential.

Does BTB26-600BRG support 4-quadrant triggering, and how does it differ from snubberless mode?

Yes - it supports both 4-quadrant (standard) and 3-quadrant (snubberless) operation. In 4-quadrant mode, IGT ≤ 100 mA applies across all quadrants; in snubberless mode, IGT ≤ 50 mA and dV/dt immunity increases to 1000 V/µs, but quadrant IV triggering is not guaranteed.

Can BTB26-600BRG replace BTA26-600BRG in an existing design?

Only if electrical isolation of the heatsink is not required. BTB26 has identical voltage/current ratings and pinout but lacks the 2500 VRMS insulated tab. Mechanical fit is identical (same TOP3 footprint), but PCB layout must ensure the tab remains at A2 potential - no grounding or floating connections allowed.