STMicroelectronics BTB08-600CWRG

Overview

BTB08-600CWRG from STMicroelectronics is a snubberless, standard-sensitivity 8 A, 600 V triac in 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 = 110 °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 motor speed controllers, heating regulation circuits, and static relays driving inductive loads.

For engineers reviewing the BTB08-600CWRG datasheet, BTB08-600CWRG pinout, BTB08-600CWRG application, or BTB08-600CWRG equivalent, key selection criteria include commutation robustness for inductive loads, gate drive compatibility with discrete transistors or optocouplers, thermal resistance (Rth(j-c) = 1.6 °C/W), and snubberless operation without external RC networks.

Technical Context

This triac operates in three quadrants (I, II, III) with standard sensitivity (35 mA IGT max), enabling reliable triggering using conventional optotriacs or bipolar drivers. Its snubberless architecture provides high commutation performance-minimum critical dV/dt of 400 V/µs and minimum (dl/dt)c of 3.5 A/ms at 125 °C-making it suitable for inductive switching without snubbers.

It exhibits low on-state conduction loss: threshold voltage VTO ≤ 0.85 V and dynamic resistance RD ≤ 50 mΩ at Tj = 125 °C. Thermal design is supported by Rth(j-c) = 1.6 °C/W (TO-220AB), allowing 8 A RMS operation at case temperature up to 110 °C under proper heatsinking.

Key Specifications

Pinout & Package

BTB08-600CWRG uses the TO-220AB package (non-insulated tab), with three terminals: Main Terminal 1 (A1), Main Terminal 2 (A2), and Gate (G). The metal tab is electrically connected to A2 and must be isolated from chassis ground unless referenced to A2 potential.

Key Features

Applications

Equivalent & Alternatives

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

Compared with BTB08-600CWRG, BTA08-600CW adds isolation at the cost of higher thermal resistance, while T835-600B trades through-hole robustness for SMT compatibility and reduced current capacity-choice depends on mechanical mounting, safety certification, and thermal budget requirements.

Availability

BTB08-600CWRG is available at Aetrix Electronics and suitable for motor speed controllers, heating regulation systems, static relay modules, and light dimmers requiring stable component supply across industrial and consumer production programs.

Supply support for BTB08-600CWRG 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, specializing in power discrete devices, microcontrollers, and analog ICs for industrial, automotive, and consumer markets.

BTB08-600CWRG belongs to ST's high-reliability snubberless triac product line, engineered specifically for robust AC switching in inductive-load environments such as motor drives and heating systems.

FAQ

What is the maximum junction temperature for BTB08-600CWRG?

The maximum operating junction temperature (Tj) is +125 °C, as specified in Table 1. This limit applies under steady-state conditions with appropriate heatsinking. Exceeding this temperature risks parametric shift and accelerated degradation of the silicon die and bond wires.

Can BTB08-600CWRG replace a standard 4-quadrant triac in existing designs?

Yes, but only if the original design operates exclusively in quadrants I, II, and III and does not rely on quadrant IV triggering. BTB08-600CWRG is a 3-quadrant device-its gate trigger characteristics are not specified for quadrant IV, so quadrant IV gate drive must be disabled or avoided in the control circuit.

Is a heatsink required for 8 A RMS operation?

Yes. With Rth(j-c) = 1.6 °C/W and typical power dissipation of ~1.2 W at 8 A RMS (based on VTM ≈ 1.5 V), a heatsink with Rth(c-a) ≤ 2.5 °C/W is required to maintain Tj ≤ 125 °C at 25 °C ambient. Without a heatsink, safe continuous current drops below 2 A.

Does BTB08-600CWRG require a snubber circuit with inductive loads?

No. As a snubberless triac, BTB08-600CWRG is characterized for dV/dt ≥ 400 V/µs and (dl/dt)c ≥ 3.5 A/ms at 125 °C, enabling reliable commutation on inductive loads (e.g., motors, solenoids) without external RC snubbers-reducing BOM count and board area.