STMicroelectronics BTA24-700BWRG

Overview

BTA24-700BWRG from STMicroelectronics is a 25 A RMS, 700 V repetitive peak off-state voltage (VDRM/VRRM), snubberless triac in insulated TO-220AB package, designed for phase-controlled AC switching in lighting and motor control circuits with high commutation capability in three quadrants. It features 50 mA gate trigger current (IGT), 1.3 V maximum gate trigger voltage (VGT), and 50 A/µs critical rate of rise of on-state current (dl/dt).

For engineers reviewing the BTA24-700BWRG datasheet, BTA24-700BWRG pinout, BTA24-700BWRG application, or BTA24-700BWRG equivalent, key selection criteria include its snubberless 3-quadrant operation, 2.5 kV insulation rating, 1.7 °C/W junction-to-case thermal resistance, and UL1557 recognition for safety-critical static relay designs.

Technical Context

This triac operates in three quadrants (I, II, III) without requiring external snubber networks due to its high dV/dt immunity (≥1000 V/µs at Tj = 125 °C) and robust (dI/dt)c rating (≥22 A/ms). Its insulated TO-220AB package enables direct mounting to grounded heatsinks while maintaining 2.5 kV RMS isolation for enhanced system safety.

The device delivers stable conduction under high commutation stress, with holding current (IH) ≤75 mA and latching current (IL) ≤80 mA at 25 °C, and maintains low on-state voltage (VTM ≤1.55 V at 35 A, 25 °C) to minimize power loss in 50/60 Hz AC mains applications.

Key Specifications

Pinout & Package

Package: TO-220AB insulated - thermally conductive but electrically isolated tab (2.5 kV RMS insulation), UL94 V0 flammability resin, lead-free plating, recommended torque 0.55 N·m.

Key Features

Applications

Equivalent & Alternatives

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

Compared with BTA24-600BWRG, the -700 variant provides higher voltage headroom for global 230/240 VAC markets; versus BTB24-700BWRG, it eliminates external isolation design effort while maintaining identical switching performance and thermal capability.

Availability

BTA24-700BWRG is available at Aetrix Electronics and suitable for light dimming systems, heating element control, induction motor starting circuits, and static relay modules requiring stable component supply across industrial and appliance OEM programs.

Supply support for BTA24-700BWRG 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, specializing in power management, analog, MCU, and sensor technologies for automotive, industrial, and consumer applications.

The BTA series belongs to ST's high-reliability AC power switching portfolio, engineered specifically for snubberless, high-commutation triac operation in safety-critical mains-connected equipment such as home appliances and industrial controls.

FAQ

What is the maximum junction temperature for continuous operation?

The BTA24-700BWRG has an operating junction temperature range of –40 °C to +125 °C. For sustained 25 A RMS conduction, the case temperature must be held ≤75 °C to prevent exceeding Tj(max), based on its 1.7 °C/W Rth(j-c) and typical power dissipation of ~1.7 W at rated current.

Can this triac be driven directly by a microcontroller GPIO pin?

No-its 50 mA maximum gate trigger current (IGT) exceeds typical GPIO sink/source capability (usually ≤20 mA). A driver stage (e.g., MOC3021 optocoupler or discrete transistor buffer) is required to deliver sufficient gate charge without violating MCU absolute maximum ratings.

Is heatsinking mandatory for 25 A RMS operation?

Yes-without heatsinking, the device cannot sustain 25 A RMS due to thermal limits. At 75 °C case temperature, the 1.7 °C/W Rth(j-c) allows ~42.5 W dissipation; actual on-state loss (~1.55 V × 25 A × duty factor) mandates a heatsink capable of maintaining Tc ≤75 °C under worst-case ambient conditions.

Does the "W" in BTA24-700BWRG indicate RoHS compliance?

Yes-the "W" suffix denotes RoHS-compliant, halogen-free packaging per EU Directive 2002/95/EC and ST's ECOPACK2 standard, including lead-free terminations and UL94 V0 flammability-rated molding compound.