STMicroelectronics ACS102-5T1-TR

Overview

ACS102-5T1-TR from STMicroelectronics is an AC line switch IC in SO-8 package, designed for full-cycle ON/OFF static switching of low-power inductive and resistive loads up to 0.2 A RMS at 100 °C ambient. It features integrated high-voltage clamping (V_CL = 600 V), negative-gate triggering (I_GT < 5 mA), and direct microcontroller interface without external protection. Used in appliance control systems including washing machines, door locks, and solenoid valves.

For engineers reviewing the ACS102-5T1-TR datasheet, ACS102-5T1-TR pinout, ACS102-5T1-TR application, or ACS102-5T1-TR equivalent, key selection criteria include clamping voltage robustness, gate drive polarity compatibility, thermal resistance with PCB copper area, IEC61000-4-5 transient immunity, and SO-8 cooling pad integration capability for multi-device mounting.

Technical Context

The ACS102-5T1-TR implements ST's ASD™ architecture, integrating a high-voltage avalanche clamp diode and gate-level shifter driver to isolate digital controllers from mains-referenced switching paths. Its negative-gate trigger mechanism requires current flow *out* of the G pin, enabling direct connection to MCU GPIOs via a series resistor.

It sustains 2 kV non-repetitive line pulse voltage per IEC61000-4-5, dissipates up to 20 mJ turn-off energy from inductive loads (e.g., valves, relays), and operates across –30 °C to +125 °C junction temperature with no external snubber or overvoltage protection required.

Key Specifications

Pinout & Package

ACS102-5T1-TR uses an SO-8 surface-mount package with two COM pins (pins 2 and 3) serving as thermal and electrical common reference, and a 3.5 mm creepage distance from OUT (pin 8) to all other pins for reinforced insulation. The package supports shared cooling pads for multiple devices.

Key Features

Applications

Equivalent & Alternatives

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

Compared with ACS102-5TA-TR and ACS108-5T1-TR, the ACS102-5T1-TR offers optimal balance of compact size, thermal performance with PCB copper, and cost for sub-0.2 A appliance loads-making it ideal for space-constrained, high-volume consumer electronics.

Availability

ACS102-5T1-TR is available at Aetrix Electronics and suitable for washing machine control modules, dishwasher solenoid drivers, refrigerator fan circuits, and cookware micro-motor interfaces requiring stable component supply and long-term industrial availability.

Supply support for ACS102-5T1-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, designing and manufacturing analog, mixed-signal, power, and microcontroller products for automotive, industrial, and consumer markets.

The ACS™ AC line switch product line was developed specifically for replacing electromechanical relays and discrete triac-based solutions in white goods and industrial controls-emphasizing integration, surge resilience, and simplified MCU interfacing.

FAQ

What is the correct gate drive configuration for ACS102-5T1-TR?

The ACS102-5T1-TR requires a negative gate current flowing *out* of the G pin. Connect the MCU GPIO to G via a current-limiting resistor (e.g., 140 Ω for 12 V drive), with COM tied to MCU ground/neutral. No external pull-up or protection diodes are needed-the device sources gate current internally during conduction.

Can ACS102-5T1-TR drive a 0.3 A resistive load?

Yes-under full-cycle AC conduction with proper thermal management (≥40 mm² copper under COM pins), the device supports up to 0.3 A RMS. However, its rated continuous current is 0.2 A at 100 °C ambient; exceeding this requires validation of junction temperature rise using R_th(j-l) = 150 °C/W and actual power dissipation from V_TM ≈ 1.2 V.

Does ACS102-5T1-TR require a heat sink?

No dedicated heat sink is required. The SO-8 package achieves adequate thermal performance when pins 2 and 3 (COM) are soldered to ≥40 mm² of 35 µm copper on FR4 PCB-providing R_th(j-l) = 150 °C/W. Larger copper areas further reduce thermal resistance, but no external heatsink or thermal compound is necessary.

How does ACS102-5T1-TR handle IEC61000-4-5 surges?

The device withstands 2 kV non-repetitive line surge pulses per IEC61000-4-5 (1.2/50 µs voltage wave, 8/20 µs current wave) when tested with R = 150 Ω and L = 5 µH. Its integrated clamping structure limits V_OUT to ≤600 V during surge events, protecting downstream loads without external components.