STMicroelectronics BTA08-600SRG

Overview

BTA08-600SRG from STMicroelectronics is a snubberless, logic-level triac rated for 8 A RMS on-state current and 600 V repetitive peak off-state voltage (VDRM/VRRM), designed for AC switching in inductive load applications such as motor speed control and heating regulation. It features insulated TO-220AB package with 2500 VRMS voltage-isolated tab, 5 mA maximum gate trigger current (IGT), and high commutation performance enabling reliable operation without external snubbers.

For engineers reviewing the BTA08-600SRG datasheet, BTA08-600SRG pinout, BTA08-600SRG application, or BTA08-600SRG equivalent, key selection criteria include its snubberless capability for inductive loads, low IGT compatibility with microcontroller GPIOs, insulated package for enhanced safety in mains-connected systems, and thermal resistance of 2.5 °C/W (junction-to-case).

Technical Context

This triac operates in three quadrants (I, II, III) with logic-level sensitivity (IGT ≤ 5 mA), enabling direct drive from 3.3 V or 5 V microcontrollers without gate buffer stages. Its snubberless architecture delivers high critical rate of decrease of main current (dl/dt)c ≥ 4.5 A/ms at (dV/dt)c = 0.1 V/µs and ≥ 7 A/ms without snubber, ensuring robust turn-off under inductive stress.

It supports full-cycle AC phase control and ON/OFF switching, with guaranteed latching current (IL) ≤ 10 mA and holding current (IH) ≤ 10 mA at Tj = 25 °C - critical for stable zero-crossing and non-zero-crossing dimmer/motor control topologies. Junction temperature range spans −40 °C to +125 °C, and it complies with UL insulation rating E81734.

Key Specifications

Pinout & Package

Package: TO-220AB Insulated - Thermally conductive but electrically isolated metal tab rated for 2500 VRMS per UL E81734; requires no insulating washer when mounted to grounded heatsink.

Key Features

Applications

Equivalent & Alternatives

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

Compared with BTA08-600SWRG, the BTA08-600SRG offers tighter gate sensitivity for ultra-low-power MCU interfaces; compared with T835-600H, it provides certified electrical isolation essential for safety-critical mains-connected equipment, albeit with through-hole assembly and slightly higher thermal resistance.

Availability

BTA08-600SRG is available at Aetrix Electronics and suitable for motor speed control, heating regulation, light dimming, and static relay replacement requiring stable component supply, long-lifecycle assurance, and UL-compliant insulation.

Supply support for BTA08-600SRG 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 management, analog, microcontrollers, and automotive-grade ICs.

The BTA08-600SRG belongs to ST's high-reliability snubberless triac product line, engineered specifically for robust AC switching in safety-critical, inductive-load industrial and appliance applications.

FAQ

What is the maximum junction temperature and thermal resistance of BTA08-600SRG?

The device operates from −40 °C to +125 °C junction temperature. Its insulated TO-220AB package has a maximum junction-to-case thermal resistance (Rth(j-c)) of 2.5 °C/W, verified per DS2114 Rev 16 Table 5. This allows 20 W power dissipation with a 50 °C temperature rise from case to junction, supporting compact heatsink designs in enclosed enclosures.

Can BTA08-600SRG be used without a heatsink?

No - continuous 8 A RMS operation requires active thermal management. At 8 A and typical VTM ≈ 1.3 V, conduction loss exceeds 10 W. Without a heatsink, junction temperature would exceed 125 °C within seconds. ST recommends minimum 25 cm² copper pour or dedicated aluminum heatsink per Figure 2 and Table 5 derating curves.

Is BTA08-600SRG compatible with zero-crossing SSR driver ICs?

Yes - its 5 mA max IGT and 1.2 V max VGT align with standard zero-crossing driver outputs (e.g., MOC3063, IL420). However, unlike opto-triacs, BTA08-600SRG requires external gate resistor (typically 330 Ω) to limit peak IGM to 4 A and ensure clean turn-on without oscillation.

Does the insulated tab eliminate need for an insulating pad during heatsink mounting?

Yes - the UL-certified 2500 VRMS isolation (E81734) permits direct metal-to-metal contact between the tab and grounded heatsink. No mica or silicone pad is required, though thermal paste remains essential for optimal Rth(j-hs) performance. Mechanical torque must not exceed 0.70 N·m per ST's TO-220AB specification.