STMicroelectronics BTA08-600CWRG

Overview

BTA08-600CWRG from STMicroelectronics is a snubberless, standard-sensitivity 8 A, 600 V triac in insulated TO-220AB package, designed for AC mains switching in phase-control and ON/OFF applications. It delivers 8 A RMS on-state current at Tc = 100 °C, supports 600 V repetitive peak off-state voltage (VDRM/VRRM), and features 35 mA maximum gate trigger current (IGT) in quadrants I–III. It is used in heating regulation circuits with inductive loads where high commutation performance is required.

For engineers reviewing the BTA08-600CWRG datasheet, BTA08-600CWRG pinout, BTA08-600CWRG application, or BTA08-600CWRG equivalent, key selection criteria include snubberless operation on inductive loads, insulated tab rated at 2500 VRMS per UL E81734, thermal resistance Rth(j-c) = 2.5 °C/W, and compatibility with microcontroller-driven gate drivers requiring ≤35 mA IGT.

Technical Context

This triac operates in three quadrants (I, II, III) with standard sensitivity (35 mA max IGT), enabling reliable triggering without external snubbers across inductive loads. Its critical dV/dt rating of 400 V/µs (at Tj = 125 °C, gate open) and commutation capability (dl/dt)c ≥ 4.5 A/ms ensure robust turn-off under reactive load conditions.

The insulated TO-220AB package provides galvanic isolation between the main terminals and mounting surface, supporting safe integration into grounded-chassis AC control systems. Junction-to-case thermal resistance is fixed at 2.5 °C/W, enabling predictable heatsink sizing for continuous 8 A RMS conduction at Tc ≤ 100 °C.

Key Specifications

Pinout & Package

Package: Insulated TO-220AB (UL-rated 2500 VRMS tab insulation, ECOPACK2 compliant, torque spec: 0.55 N·m recommended).

Key Features

Applications

Equivalent & Alternatives

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

Compared with BTA08-600CWRG, BTA08-600BWRG trades gate sensitivity for higher dV/dt immunity, while T835-600B offers superior thermal efficiency in surface-mount form but forfeits built-in isolation - making the CWRG variant optimal for insulated, through-hole AC control where gate drive headroom is limited.

Availability

BTA08-600CWRG is available at Aetrix Electronics and suitable for heating regulation, light dimming, induction motor starting, and static relay replacement requiring stable component supply across industrial and appliance OEM programs.

Supply support for BTA08-600CWRG 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, delivering innovative analog, power, and microcontroller solutions for industrial, automotive, and consumer markets.

BTA08-600CWRG belongs to ST's high-reliability snubberless triac product line, engineered specifically for robust AC mains switching in thermally demanding, inductive-load applications with minimal external components.

FAQ

What is the maximum junction temperature for continuous operation?

The BTA08-600CWRG has an operating junction temperature range of –40 °C to +125 °C. For continuous 8 A RMS conduction, case temperature must be maintained at or below 100 °C, as specified in Table 1. Exceeding this limit risks thermal runaway due to the device's positive temperature coefficient of on-state voltage.

Can this triac be driven directly by a 3.3 V microcontroller GPIO?

No - the BTA08-600CWRG requires up to 35 mA gate current (IGT) for reliable triggering, exceeding typical GPIO sink/source capability (usually ≤20 mA). A dedicated triac driver IC (e.g., MOC302x optocoupler) or transistor buffer is required to meet the 35 mA pulse demand while maintaining logic-level compatibility.

Is a heatsink mandatory for 8 A RMS operation?

Yes - with Rth(j-c) = 2.5 °C/W and maximum Tj = 125 °C, dissipating ~12.5 W (based on VTM ≈ 1.55 V × 8 A) requires a heatsink limiting thermal rise from case to ambient to ≤100 °C. Without forced air, a minimum 10 cm² aluminum heatsink is recommended to maintain Tc ≤ 100 °C at full load.

Does "snubberless" mean no external components are ever needed?

"Snubberless" means the device is characterized and guaranteed to commutate reliably without an RC snubber under defined inductive load conditions (e.g., dV/dt ≤ 400 V/µs, (dl/dt)c ≥ 4.5 A/ms). However, highly reactive loads or fast-switching noise may still require localized filtering; always validate in final application per IEC 61000-4-4/5.