STMicroelectronics ACS102-5TA-TR

Overview

ACS102-5TA-TR from STMicroelectronics is a high-voltage AC line switch in TO-92 package, designed for full-cycle ON/OFF control of low-power inductive and resistive loads up to 0.2 A RMS at 100 °C ambient. It features 500 V repetitive peak off-state voltage (VDRM/VRRM), 600 V clamping voltage (VCL), gate trigger current < 5 mA, integrated avalanche clamping structure, and direct microcontroller interface via negative gate current.

For engineers reviewing the ACS102-5TA-TR datasheet, ACS102-5TA-TR pinout, ACS102-5TA-TR application, or ACS102-5TA-TR equivalent, this device serves as a self-protected, single-chip alternative to discrete TRIAC + snubber + protection circuits in appliance motor, solenoid, relay, and lamp control - with no external overvoltage protection required and IEC61000-4-5 compliance enabled by on-die clamping.

Technical Context

The ACS102-5TA-TR implements ST's ASD™ architecture, integrating a high-voltage thyristor switch with an on-die avalanche clamp diode and gate-level shifter. It operates with negative gate current (sourced from COM), enabling direct drive from MCU GPIO without level-shifting circuitry or isolation components.

Its turn-off commutation is load-dependent but validated for door locks, valves, relays, micro-motors, and lamps up to 0.2 A RMS; switching within one full AC cycle extends usable current to 0.3 A. Thermal resistance junction-to-ambient is 150 °C/W (TO-92), and it sustains 2 kV non-repetitive line pulse per IEC61000-4-5 when used with appropriate load impedance.

Key Specifications

Pinout & Package

ACS102-5TA-TR uses TO-92 plastic package (ordering code "A"), with three leads: G (Gate), COM (Common drive reference), and OUT (Switch Output). The package provides 150 °C/W thermal resistance (junction-to-ambient) and supports soldering at 260 °C for 10 s.

Key Features

Applications

Equivalent & Alternatives

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

Compared with ACS102-5T1-TR, the -5TA-TR offers identical electrical specs in a smaller TO-92 footprint but lacks multi-device thermal sharing; compared with ACS108-5TA-TR, it trades current capacity for lower gate drive demand and smaller size - making it optimal for space-constrained, low-current appliance sub-systems.

Availability

ACS102-5TA-TR is available at Aetrix Electronics and suitable for washing machine control modules, dishwasher valve drivers, refrigerator dispenser actuators, and electric cookware lamp/fan interfaces requiring stable component supply across extended production lifecycles.

Supply support for ACS102-5TA-TR 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, MEMS, and microcontroller technologies for industrial, automotive, and appliance markets.

The ACS™ AC line switch product line was developed specifically to replace legacy TRIAC-based control circuits in white goods with integrated, self-protected, microcontroller-direct switches - reducing design complexity and improving surge resilience.

FAQ

What is the maximum load current the ACS102-5TA-TR can switch reliably?

The ACS102-5TA-TR is rated for 0.2 A RMS continuous current at 100 °C ambient temperature. Under full-cycle AC conduction with proper heatsinking and within its junction temperature limit (–30 to +125 °C), it supports up to 0.3 A RMS for short-duration or intermittent loads. This rating is validated for resistive and inductive loads including solenoids, relays, and micro-motors per Table 1 in the datasheet.

Can the ACS102-5TA-TR be driven directly from a 3.3 V microcontroller GPIO?

Yes. The device triggers with a negative gate current flowing out of the G pin, requiring less than 5 mA at 25 °C. A 3.3 V MCU GPIO can drive it directly using a series resistor (e.g., 220 Ω) to limit current to ~10 mA peak, well within the 1 A IGM absolute maximum rating. No level shifter, optocoupler, or external driver IC is needed.

Does the ACS102-5TA-TR require external snubber or MOV protection?

No. Its integrated avalanche clamping structure limits VCL to 600 V and absorbs up to ~20 mJ of inductive turn-off energy, eliminating the need for external snubbers or MOVs. It meets IEC61000-4-5 surge immunity requirements (2 kV) when used with standard load impedances (R = 150 Ω, L = 5 µH), as verified in Figure 3 and 4 of the datasheet.

How does the TO-92 package affect thermal performance compared to SO-8 variants?

The TO-92 package has Rth(j-a) = 150 °C/W, identical in value to the SO-8 version, but achieves this through different physical mechanisms: TO-92 relies on lead conduction, while SO-8 leverages a 40 mm² copper pad under COM pins. TO-92 is suitable for ≤0.2 A RMS in free-air or minimal copper; SO-8 allows thermal sharing across multiple devices on one pad - critical for higher-density or multi-switch designs.