STMicroelectronics BTA24-600BW

Overview

BTA24-600BW from STMicroelectronics is a snubberless 3-quadrant triac in insulated TO-220AB package, rated for 25 A RMS on-state current and 600 V repetitive peak off-state voltage, with 50 mA gate trigger current (IGT), designed for phase-controlled AC switching in motor speed controllers and lighting dimmers.

For engineers reviewing the BTA24-600BW datasheet, BTA24-600BW pinout, BTA24-600BW application, or BTA24-600BW equivalent, key selection criteria include its snubberless operation at 1000 V/µs dV/dt, 22 A/ms critical rate of rise of on-state current, low 1.7 °C/W junction-to-case thermal resistance, and UL1557 recognition for reinforced insulation.

Technical Context

The BTA24-600BW operates as a 3-quadrant snubberless triac, enabling robust commutation without external snubbers in high-dV/dt environments. Its gate trigger threshold (VGT ≤ 1.3 V) and holding current (IH ≤ 75 mA) are specified across quadrants I, II, and III, with guaranteed minimum IGT at 5% of max (2.5 mA).

Thermal performance is defined by Rth(j-c) = 1.7 °C/W (insulated TO-220AB) and Rth(j-a) = 60 °C/W (free-air), supporting continuous 25 A RMS conduction at Tc = 75 °C. The device sustains non-repetitive surge currents up to 250 A (50 Hz, 20 ms) and fusing I²t = 340 A²s.

Key Specifications

Pinout & Package

Package: TO-220AB insulated - UL94 V0 flammability-rated epoxy, halogen-free, lead-free plating, 2.5 kV RMS insulation rating (1 minute), recommended mounting torque 0.55 N·m.

Key Features

Applications

Equivalent & Alternatives

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

Compared with BTB24-600BW and T2535-600G, the BTA24-600BW uniquely provides certified reinforced insulation in a through-hole package, trading 0.9 °C/W higher thermal resistance for elimination of external isolation barriers - critical for safety-certified end equipment.

Availability

BTA24-600BW is available at Aetrix Electronics and suitable for light dimming systems, induction motor starters, heating regulation circuits requiring stable component supply, long-lifecycle assurance, and UL-compliant insulation integrity.

Supply support for BTA24-600BW 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.

The BTA24-600BW belongs to ST's high-reliability snubberless triac product line, engineered specifically for robust AC power control in safety-critical, thermally constrained, and high-noise industrial environments.

FAQ

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

The BTA24-600BW supports 25 A RMS continuous conduction at Tc = 75 °C, as confirmed in Figure 2 of DS2112 Rev 13. Exceeding this temperature requires derating per the IT(RMS) vs. TC curve; operation above 75 °C reduces RMS current capacity linearly to zero at 125 °C junction temperature.

Can BTA24-600BW replace a standard 4-quadrant triac in existing designs?

No - the BTA24-600BW is a 3-quadrant snubberless device and does not conduct in Quadrant IV. It cannot replace 4-quadrant triacs (e.g., BTB24-600B) in circuits requiring gate-triggered turn-on with negative gate-to-A1 voltage, such as certain zero-crossing solid-state relays or bidirectional logic interfaces.

Is heatsinking mandatory for 25 A RMS operation?

Yes - the 1.7 °C/W Rth(j-c) requires a heatsink to maintain Tj ≤ 125 °C at 25 A RMS. Without heatsinking, free-air Rth(j-a) = 60 °C/W limits usable current to ~0.4 A. A minimum 10 cm² aluminum heatsink is recommended for sustained 25 A operation at 75 °C case temperature.

Does the 2.5 kV insulation rating apply to all operating conditions?

Yes - the 2.5 kV RMS insulation withstand (1 minute, per Table 1) is certified under UL1557 for the insulated TO-220AB package and remains valid across the full storage temperature range (–40 to +150 °C) and at maximum rated junction temperature (125 °C), provided creepage and clearance distances on the PCB comply with UL61800-5-1.