UMW BTA24-800BWRG

Overview

BTA24-800BWRG from STMicroelectronics is a 25 A RMS, 800 V repetitive peak off-state voltage snubberless triac in insulated TO-220AB package, designed for high-commutation AC switching in phase-control and on/off applications. It delivers 50 mA gate trigger current (IGT), 1.55 V max on-state voltage (VTM) at 25 °C, and 0.8 °C/W junction-to-case thermal resistance - enabling robust thermal management in heating regulators and motor starters.

For engineers reviewing the BTA24-800BWRG datasheet, BTA24-800BWRG pinout, BTA24-800BWRG application, or BTA24-800BWRG equivalent, key selection criteria include snubberless 3-quadrant commutation capability, 1000 V/µs dV/dt immunity at 125 °C, 250 A non-repetitive surge rating, and UL1557 recognition for safety-critical static relay designs.

Technical Context

This triac operates in snubberless 3-quadrant mode (QI–QIII), eliminating external snubber networks in inductive load switching. Its gate trigger threshold (VGT ≤ 1.3 V) and low holding current (IH ≤ 75 mA) support reliable turn-on with standard microcontroller GPIO drivers.

Thermal design leverages a 0.8 °C/W Rth(j-c) and 2.5 kV insulation rating, allowing direct heatsink mounting without isolation pads. The device sustains 25 A RMS at Tc = 100 °C and withstands 250 A surge (50 Hz, 20 ms) - critical for induction motor starting transients.

Key Specifications

Pinout & Package

TO-220AB insulated package with creepage/clearance optimized for reinforced insulation. Tab is electrically isolated from A2 terminal (2.5 kV RMS dielectric strength).

Key Features

Applications

Equivalent & Alternatives

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

Compared with BTB24-800BWRG and T2535-800G, BTA24-800BWRG uniquely combines reinforced insulation, snubberless 3Q operation, and through-hole reliability - making it optimal for certified static relays and industrial heating controllers where safety certification and manual serviceability are prioritized.

Availability

BTA24-800BWRG is available at Aetrix Electronics and suitable for heating regulation, light dimming, static relay implementation, and induction motor starting circuits requiring stable component supply across automotive aftermarket, industrial OEM, and white goods production programs.

Supply support for BTA24-800BWRG 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, mixed-signal, power, and microcontroller solutions for industrial, automotive, and consumer markets.

The BTA series belongs to ST's high-power discrete triac product line, engineered specifically for robust, snubberless AC switching in safety-certified appliances and industrial controls where reliability under high dv/dt and surge stress is mandatory.

FAQ

What is the maximum junction temperature for continuous operation?

The BTA24-800BWRG has an operating junction temperature range of –40 °C to +125 °C. For continuous 25 A RMS conduction, case temperature must be maintained ≤100 °C per Figure 2 in DS2112 Rev 13, requiring heatsinking that limits thermal rise to ≤25 °C above ambient when using the 0.8 °C/W Rth(j-c).

Does this triac require a snubber circuit?

No - BTA24-800BWRG is a snubberless triac rated for 3-quadrant operation with 1000 V/µs dV/dt immunity at 125 °C. It eliminates external RC snubbers in inductive load switching, provided gate drive meets minimum IGT (50 mA) and dI/dt limits (22 A/ms) are respected during turn-on.

How is the insulated TO-220AB package different from standard TO-220AB?

The insulated TO-220AB variant (denoted by 'R' in part number suffix) features a dielectric barrier between the metal tab and A2 terminal, achieving 2.5 kV RMS insulation. This enables direct mounting to grounded heatsinks without additional isolation hardware - unlike uninsulated BTB24 variants which require insulating pads or shoulder washers.

Can BTA24-800BWRG replace BTA16-800BWRG in existing designs?

Yes - BTA24-800BWRG is a direct upgrade with identical pinout, voltage rating, and snubberless functionality, but higher 25 A RMS current handling (vs. 16 A). Thermal design must be re-evaluated: junction-to-case resistance remains 0.8 °C/W, but power dissipation increases ~56% at full rated current, requiring larger heatsink area or forced cooling.