STMicroelectronics ACST210-8FP

Overview

ACST210-8FP from STMicroelectronics is an overvoltage-protected AC switch (Triac-based A.S.D.® discrete) designed for direct microcontroller-driven AC on/off control of inductive loads up to 2 A RMS. It integrates crowbar overvoltage clamping (VCL ≥ 850 V), delivers 800 V blocking voltage (VDRM/VRRM), and requires only 10 mA gate trigger current (IGT), enabling logic-level drive without external buffers.

For engineers reviewing the ACST210-8FP datasheet, ACST210-8FP pinout, ACST210-8FP application, or ACST210-8FP equivalent, this device is selected for IEC 61000-4-4/4-5-compliant static switching in appliances and industrial controls where high dV/dt immunity (>500 V/µs at 125 °C), self-protected transients, and reduced BOM count are critical.

Technical Context

The ACST210-8FP implements a planar Triac structure with integrated high-voltage clamping circuitry that activates during line transients-either clamping low-energy spikes or latching into conduction (<10 ms) to dissipate high-energy surges per IEC 61000-4-5. Its gate sensitivity (IGT ≤ 10 mA) is maintained while achieving static dV/dt > 500 V/µs at Tj = 125 °C-5–10× higher than standard Triacs of comparable sensitivity.

It operates in quadrants I, II, and III, supports full-sine RMS currents up to 2 A at Tc = 105 °C, and features a 1500 V_RMS insulation rating in the TO-220FPAB package. Thermal resistance R_th(j-c) is 7 °C/W, enabling reliable operation without heatsink in low-power applications.

Key Specifications

Pinout & Package

ACST210-8FP is housed in the TO-220FPAB package-a fully insulated, epoxy-molded variant of TO-220 with creepage/clearance optimized for 1500 V_RMS isolation. The tab is electrically isolated and rated for mounting torque of 0.4–0.6 N·m.

Key Features

Applications

Equivalent & Alternatives

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

Compared with ACS108-6SN and BTB12-600CW, ACST210-8FP uniquely combines 2 A load handling, 800 V blocking, logic-level gate drive, and self-contained IEC 61000-4-5 surge protection-reducing system-level BOM, validation effort, and failure modes in safety-critical AC control.

Availability

ACST210-8FP is available at Aetrix Electronics and suitable for washing machine motor control, industrial solenoid valve actuation, and HVAC fan switching requiring stable component supply, long-term lifecycle support, and IEC-compliant transient ruggedness.

Supply support for ACST210-8FP 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, analog, MCU, and sensor technologies for industrial, automotive, and consumer markets.

The ACST2 series belongs to ST's ACS™/ACST A.S.D.® (Application Specific Discrete) family-engineered specifically for robust, simplified AC load switching in appliances and industrial controls where reliability, surge immunity, and integration reduce system complexity.

FAQ

Is ACST210-8FP compatible with zero-crossing detection circuits?

Yes. The device supports both zero-crossing and phase-angle control. Its high dV/dt immunity (>500 V/µs) prevents false triggering during voltage transitions, and its low IGT (≤10 mA) allows direct interface with standard zero-crossing optocouplers like MOC3041 or MCU-based timing logic without additional conditioning.

Does ACST210-8FP require a heatsink in typical 2 A applications?

In most 2 A RMS applications with natural convection and ≥0.5 cm² copper area under the tab, no external heatsink is required. Thermal data shows P_D remains within limits up to T_c = 105 °C; R_th(j-c) = 7 °C/W and R_th(j-a) = 60 °C/W (FR4, SCU = 0.5 cm²) enable adequate dissipation at ambient ≤70 °C.

Can ACST210-8FP replace a mechanical relay in appliance designs?

Yes-specifically for AC on/off switching of inductive/resistive loads ≤2 A. It eliminates relay wear, contact arcing, and acoustic noise while offering superior IEC 61000-4-4/4-5 immunity. Unlike relays, it requires no coil drive circuitry and integrates transient protection, reducing total solution size and cost.

What is the maximum surge energy the integrated crowbar can handle?

The device withstands IEC 61000-4-5 2 kV line-to-ground surges (1.2/50 µs voltage, 8/20 µs current) at least 10 times per polarity. Its clamping voltage VCL ≥ 850 V and I²t rating of 0.5 A²s (tp = 10 ms) define safe single-pulse energy absorption; repetitive surges must respect thermal limits and junction temperature constraints.