STMicroelectronics BTW68-800RG

Overview

BTW68-800RG from STMicroelectronics is a 30 A, 800 V RMS-rated insulated TRIAC designed for high-power AC switching in solid-state relays, battery chargers, UPS systems, and industrial welding equipment. It features 50 mA gate trigger current, 2500 VRMS UL-certified insulation (E81734), and clip-based construction enabling 400 A non-repetitive surge current handling at 10 ms.

For engineers reviewing the BTW68-800RG datasheet, BTW68-800RG pinout, BTW68-800RG application, or BTW68-800RG equivalent, this device is selected for thermally demanding AC power control where high I²t robustness, galvanic isolation, and stable gate triggering across -40°C to +125°C junction temperature are required.

Technical Context

This insulated TRIAC uses a symmetric bidirectional thyristor structure with gate-controlled turn-on and natural commutation at current zero-crossing. Its internal ceramic pad ensures 2500 VRMS isolation between MT1/MT2 terminals and case, meeting UL 2500 V requirements.

The device operates with 1.5 V maximum gate trigger voltage and sustains 500 V/µs critical dV/dt at 125°C without false triggering, while delivering 2.1 V max on-state voltage at 60 A peak current - optimized for low conduction loss in high-current AC phase-control circuits.

Key Specifications

Pinout & Package

The BTW68-800RG is housed in the TOP3 insulated package - a molded epoxy housing with integrated ceramic insulating pad, UL94 V0 rated, lead-free, and torque-rated to 1.05 N·m (max 1.2 N·m). Dimensions conform to ST's mechanical drawing DS6910 Rev 4, page 5/9.

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar high-isolation TRIAC applications.

Compared with BTW68-800RG, BTB16-800CW offers lower cost but sacrifices isolation and surge robustness, while T935-800G provides higher current and isolation at the expense of thermal efficiency and package size - making BTW68-800RG optimal for 30 A, UL-certified, space-constrained industrial controls.

Availability

BTW68-800RG is available at Aetrix Electronics and suitable for solid-state relays, battery charging systems, and uninterruptible power supplies requiring stable component supply, long-lifecycle support, and UL-certified insulation integrity.

Supply support for BTW68-800RG 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.

The BTW68 series belongs to ST's high-power insulated thyristor product line, engineered specifically for ruggedized AC power switching in harsh industrial environments where galvanic isolation, surge resilience, and thermal stability are non-negotiable.

FAQ

What is the maximum allowable case temperature for continuous 30 A RMS operation?

The BTW68-800RG is rated for 30 A RMS at Tc = 80 °C, as specified in Table 1 of DS6910 Rev 4. Exceeding this temperature requires derating per Figure 3 (Average on-state current vs. case temperature), with full 30 A only permissible up to 80 °C case temperature under 180° conduction angle conditions.

Can BTW68-800RG be mounted directly to a grounded metal heatsink?

Yes - the TOP3 insulated package incorporates a certified ceramic insulating pad providing 2500 VRMS isolation between MT1/MT2 terminals and the case. This allows direct mechanical mounting to grounded heatsinks without additional insulating hardware, provided torque does not exceed 1.2 N·m per ST's mechanical specification.

What gate drive circuit is recommended for reliable triggering?

A gate trigger pulse of ≥50 mA (minimum), ≤1.5 V (maximum VGT), with rise time ≤100 ns and duration ≥20 µs is required. ST recommends using a dedicated TRIAC driver IC (e.g., MOC3021 + BTA16 buffer) or a microcontroller GPIO with ≥100 mA capable transistor stage to ensure consistent turn-on across temperature and load variations.

Does BTW68-800RG support snubberless operation?

No - although it achieves 250 V/µs dV/dt immunity at 125°C, ST does not characterize or guarantee snubberless operation for the BTW68 series. A standard RC snubber network (e.g., 100 Ω + 100 nF) is recommended for inductive loads or high-dV/dt environments to prevent false triggering and ensure long-term reliability.