STMicroelectronics BTB24-600BRG

Overview

BTB24-600BRG from STMicroelectronics is a 600 V, 25 A RMS snubberless triac in TO-220AB uninsulated package, designed for phase-controlled AC switching in lighting and motor control. It supports 4-quadrant triggering (IGT = 50 mA max), delivers 500 V/µs dV/dt immunity at 125 °C, and features low on-state voltage (VTM ≤ 1.55 V) and thermal resistance (Rth(j-c) ≤ 0.8 °C/W).

For engineers reviewing the BTB24-600BRG datasheet, BTB24-600BRG pinout, BTB24-600BRG application, or BTB24-600BRG equivalent, this device is selected for high-reliability, snubber-free dimmer circuits, induction motor starters, and static relay designs where gate drive simplicity and commutation robustness are critical.

Technical Context

The BTB24-600BRG is a standard 4-quadrant triac with symmetrical gate trigger capability across all quadrants (I–IV), enabling flexible AC phase control without polarity constraints. Its 50 mA maximum gate trigger current (IGT) and 1.3 V maximum gate trigger voltage (VGT) ensure compatibility with common microcontroller GPIOs and optocoupler drivers.

It operates with high commutation robustness: minimum dV/dt = 500 V/µs and minimum (dI/dt)c = 13.3 A/ms at 125 °C, supporting reliable turn-off under inductive loads. The device's 600 V repetitive peak off-state voltage (VDRM) and 250 A non-repetitive surge rating (ITSM @ 50 Hz) suit mains-connected industrial controls.

Key Specifications

Pinout & Package

BTB24-600BRG uses the TO-220AB uninsulated package: metal tab (A2) is electrically connected to the main terminal, requiring isolation from heatsink unless circuit topology permits direct mounting. Package meets UL94 V0 flammability and RoHS 2002/95/EC compliance.

Key Features

Applications

Equivalent & Alternatives

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

Compared with BTA24-600BRG, the insulated variant adds 2.5 kV isolation but increases thermal path resistance; compared with T2535-600G, BTB24-600BRG offers 4Q triggering and through-hole mechanical robustness but requires manual assembly and heatsink isolation planning.

Availability

BTB24-600BRG is available at Aetrix Electronics and suitable for static relay modules, motor starter circuits, and phase-control dimmers requiring stable component supply, long-term industrial lifecycle support, and traceable sourcing.

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

BTB24-600BRG belongs to ST's high-power triac product line, engineered specifically for robust, snubberless AC power control in industrial automation, building systems, and appliance applications.

FAQ

What is the maximum allowable junction temperature for BTB24-600BRG?

The absolute maximum operating junction temperature is +125 °C, as specified in Table 1 of DS2112 Rev 13. Continuous operation above this limit risks irreversible degradation of the silicon die and bond wires. Derating curves in Figure 2 show RMS current must be reduced to 15 A at Tc = 125 °C to maintain safe Tj.

Can BTB24-600BRG be used without a heatsink?

No - at 25 A RMS, power dissipation exceeds 40 W (based on VTM ≈ 1.5 V). Without a heatsink, junction temperature would exceed 125 °C within seconds. Minimum recommended heatsink thermal resistance is 1.5 °C/W for ambient ≤ 40 °C, assuming forced airflow or moderate enclosure ventilation.

Is BTB24-600BRG compatible with zero-crossing optotriacs like MOC3041?

Yes - its 50 mA max IGT and 1.3 V max VGT align with MOC3041's 100 mA peak output and 1.5 V forward voltage. However, MOC3041 is zero-crossing only; for phase control, use random-phase optotriacs such as MOC3021 or MOC3051 to fully exploit BTB24-600BRG's 4-quadrant triggering.

Does BTB24-600BRG require a snubber circuit in motor load applications?

No - it is explicitly rated as "snubberless" for 4-quadrant operation with (dI/dt)c ≥ 13.3 A/ms and dV/dt ≥ 500 V/µs at 125 °C. These specs allow reliable commutation in typical single-phase induction motors without external RC networks, though snubbers may still be needed for exceptionally high-inductance or regenerative loads.