STMicroelectronics ACST830-8GTR

Overview

ACST830-8GTR from STMicroelectronics is an 8 A, 800 V overvoltage-protected AC switch (Triac-based ASD device) with integrated clamping for IEC 61000-4-5 surge immunity, dV/dt > 2000 V/µs at 125 °C, and TO-220FPAB-compatible D²PAK package. It drives universal drum motors in washing machines and compressors in refrigerators without external snubbers.

For engineers reviewing the ACST830-8GTR datasheet, ACST830-8GTR pinout, ACST830-8GTR application, or ACST830-8GTR equivalent, this device is selected for robust AC mains switching in IEC-compliant home appliance control where high off-state reliability, self-protected turn-off transients, and reduced passive count are critical design requirements.

Technical Context

The ACST830-8GTR implements a planar Triac structure with monolithically integrated overvoltage crowbar protection, enabling safe clamping to ≥850 V (VCL) and transient conduction up to 2 kV peak per IEC 61000-4-5. Its gate trigger current is specified at 30 mA max with 1.0 V VGT, and it sustains 8 A RMS at Tc = 105 °C in D²PAK.

It operates across quadrants I, II, and III with static dV/dt immunity exceeding 2000 V/µs (gate open, Tj = 125 °C), and achieves 100 A/µs critical dI/dt without snubber. The device recovers blocking capability after surge events at the next zero-crossing, supporting ≥10 non-repetitive surges per polarity.

Key Specifications

Pinout & Package

D²PAK (TO-263) surface-mount package with isolated tab (UL94 V0 epoxy), 1.5 g weight, and recommended footprint per Figure 21 (DS2106 Rev 11 p.14). Tab is electrically connected to the COM terminal.

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar AC switch applications.

Compared with ACST810-8GTR, ACST830-8GTR offers higher gate drive margin for noisy environments; compared with ACS108-8SN, it eliminates snubber design effort and improves long-term reliability in unattended appliances.

Availability

ACST830-8GTR is available at Aetrix Electronics and suitable for washing machine motor control, refrigerator compressor drive, and industrial AC load sequencing requiring stable component supply, RoHS-compliant packaging, and tape-and-reel delivery for automated assembly.

Supply support for ACST830-8GTR 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 automotive, industrial, and consumer markets.

The ACST/ACST8 series targets high-reliability AC mains switching in white goods and industrial controls, emphasizing integrated surge protection, snubberless inductive load handling, and compliance with IEC electromagnetic compatibility standards.

FAQ

What is the maximum continuous current the ACST830-8GTR can handle in a D²PAK package?

The ACST830-8GTR supports 8 A RMS continuous current when mounted on a 1 cm² copper pad at Tc = 105 °C, per Table 1 of DS2106 Rev 11. Derating applies above this case temperature; at 25 °C ambient with natural convection, usable current drops to ~3 A due to Rth(j-a) = 45 °C/W.

Does the ACST830-8GTR require an external heat sink?

Yes - while the D²PAK package has low Rth(j-c) = 2 °C/W, its Rth(j-a) = 45 °C/W in free air necessitates a heatsink or large copper pour to sustain 8 A RMS. For 3–5 A operation, a 25 cm² double-sided copper area suffices; full 8 A requires an extruded aluminum heatsink with thermal interface material.

How does the overvoltage clamping function during a 2 kV IEC 61000-4-5 surge?

During a 2 kV surge, the ACST830-8GTR enters crowbar mode when voltage exceeds VCL (≥850 V), conducting heavily for <10 ms to shunt surge energy through the load. It automatically recovers blocking capability at the next AC zero-crossing, requiring no reset or external intervention.

Can the ACST830-8GTR replace a standard Triac like the BT139-800 in existing designs?

Yes - it is pin-compatible with BT139-800 in D²PAK footprint and shares identical MT1/MT2/G pinout. However, its higher dV/dt immunity and integrated clamping eliminate snubber components, so layout changes may be needed to remove those passives and verify gate drive timing margins.