STMicroelectronics BTB24-600BWRG

Overview

BTB24-600BWRG from STMicroelectronics is a 25 A RMS, 600 V repetitive peak off-state voltage, 4-quadrant standard Triac in TO-220AB uninsulated package, designed for phase-controlled AC switching in motor speed controllers and light dimmers with gate trigger current ≤50 mA and dV/dt immunity ≥500 V/µs.

For engineers reviewing the BTB24-600BWRG datasheet, BTB24-600BWRG pinout, BTB24-600BWRG application, or BTB24-600BWRG equivalent, this device supports high-reliability on/off and phase-control functions in industrial heating, static relays, and induction motor starting circuits where snubberless operation is not required and thermal resistance to case is critical at ≤0.8 °C/W.

Technical Context

This Triac operates in all four quadrants (I–IV) with guaranteed gate trigger current ≤50 mA across all quadrants and maximum VGT ≤1.3 V. It sustains repetitive off-state voltages up to 600 V and delivers 25 A RMS current at Tc = 75 °C in the TO-220AB package without insulation.

Its dV/dt immunity is ≥500 V/µs at Tj = 125 °C with gate open, and critical rate of rise of on-state current (dl/dt) is rated at 50 A/µs under specified test conditions. The device meets UL1557 recognition (file 81734) and RoHS 2002/95/EC compliance.

Key Specifications

Pinout & Package

BTB24-600BWRG uses the TO-220AB uninsulated package: three leads in straight-line configuration, metal tab electrically connected to A2, no internal isolation between tab and semiconductor die.

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar 4-quadrant Triac applications.

Compared with BTB24-600BWRG, BTB24-600BRG offers identical functionality with simplified packaging logistics, while BTA24-600BWRG provides mandatory isolation at the expense of +113% junction-to-case thermal resistance - guiding selection based on thermal budget versus safety architecture.

Availability

BTB24-600BWRG is available at Aetrix Electronics and suitable for industrial heating regulation, static relay modules, and motor speed control applications requiring stable component supply, long-term lifecycle support, and traceable sourcing for production programs.

Supply support for BTB24-600BWRG 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, MCU, power, and sensor solutions for automotive, industrial, and consumer markets.

BTB24-600BWRG belongs to ST's high-power Triac product line, engineered specifically for robust, cost-effective AC mains switching in industrial controls, home appliances, and building automation systems.

FAQ

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

Per Figure 2 in DS2112 Rev 13, BTB24-600BWRG supports 25 A RMS only up to TC = 75 °C in TO-220AB configuration. Exceeding this temperature requires derating - e.g., 20 A RMS at TC = 100 °C. Thermal design must ensure heatsink interface resistance and ambient conditions maintain case temperature within this limit.

Does BTB24-600BWRG require a snubber circuit in phase-control applications?

No - BTB24-600BWRG is a standard (4-quadrant) Triac, not a snubberless variant. Its dV/dt rating is 500 V/µs, sufficient for many resistive or lightly inductive loads, but inductive motor or transformer loads may require external RC snubbers to prevent false triggering during voltage transients.

How does the uninsulated TO-220AB package affect PCB layout and heatsinking?

The metal tab is electrically connected to A2 (MT2), so the heatsink must be isolated if A2 is not at chassis ground potential. PCB footprints must avoid copper under the tab unless A2 routing is intentional; thermal vias should connect to an internal ground plane only if A2 is referenced to that net.

Is BTB24-600BWRG certified for use in UL Class 1 or Class 2 circuits?

Yes - it is UL1557 recognized (file 81734) for reinforced insulation systems, enabling use in Class 1 circuits where basic or reinforced insulation is required between primary and secondary sides. It is not rated for Class 2 limited-power circuits, which require separate current-limiting design.