STMicroelectronics ACS102-6TA

Overview

ACS102-6TA from STMicroelectronics is a transient-protected AC line switch (ACS™) designed for direct microcontroller-driven AC ON/OFF control of low-power inductive or resistive loads. It delivers 0.2 A RMS on-state current, 600 V blocking voltage, and integrated overvoltage crowbar protection with 650 V clamping voltage (VCL), enabling robust switching in appliances and industrial controls without external snubbers.

For engineers reviewing the ACS102-6TA datasheet, ACS102-6TA pinout, ACS102-6TA application, or ACS102-6TA equivalent, this device offers verified IEC 61000-4-5 compliance, gate-triggered negative-current activation, and TO-92 thermal performance validated up to 100°C ambient - critical for relay, solenoid, and micro-motor drive designs where component count reduction and surge resilience are mandatory.

Technical Context

The ACS102-6TA implements an Application-Specific Device (ASD) structure combining a high-noise-immunity gate-level shifter driver and a monolithic crowbar clamping section. Its triggering relies on negative gate current (IGT ≤ 5 mA), and it operates in quadrants II–III with static dV/dt > 300 V/µs at 125°C junction temperature.

It features intrinsic turn-off commutation for inductive loads up to 15 H, clamping overvoltage during current decay to VCL ≥ 650 V, and withstands non-repetitive 2 kV line surges per IEC 61000-4-5. Thermal resistance is Rth(j-l) = 60 °C/W (TO-92), supporting stable operation without heatsinking at ≤0.2 A RMS.

Key Specifications

Pinout & Package

ACS102-6TA uses a TO-92 package with lead-free ECOPACK® construction, featuring a common tab connection for thermal coupling to PCB copper. The three-terminal configuration supports compact mounting and shared heat sinking across multiple ACS devices.

Key Features

Applications

Equivalent & Alternatives

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

Compared with ACS102-6TA, ACS108-6TA provides 4× higher current capacity in the same TO-92 footprint, while ACS102-6T1 trades thermal performance for SMT manufacturability - both retain identical crowbar protection, gate drive, and IEC 61000-4-5 compliance.

Availability

ACS102-6TA is available at Aetrix Electronics and suitable for home appliance control, industrial solenoid actuation, and smart meter load switching requiring stable component supply, long-term lifecycle support, and traceable sourcing for certified designs.

Supply support for ACS102-6TA 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, digital, and mixed-signal ICs for automotive, industrial, and consumer markets.

ACS™ switches belong to ST's Application-Specific Devices (ASD) product line, engineered specifically for robust, snubberless AC load control in cost-sensitive, safety-critical electromechanical systems.

FAQ

What is the correct gate drive polarity for ACS102-6TA?

The ACS102-6TA requires a negative gate current flowing *out* of the G pin to trigger conduction. This means the MCU GPIO must be configured as an active-low sink - connecting G to MCU pin through a resistor, with COM tied to MCU ground. Reversing polarity prevents triggering and may damage the gate structure.

Can ACS102-6TA replace a standard triac in existing designs?

Yes, but only if the existing triac circuit uses negative gate triggering and operates within 0.2 A RMS and 600 V limits. Unlike triacs, ACS102-6TA does not require snubbers or gate resistors for dv/dt immunity, so external components can be removed - however, gate drive logic must be inverted to source current instead of sinking it.

Does ACS102-6TA support zero-crossing switching?

No - ACS102-6TA is a random-phase switch and conducts immediately upon gate trigger, regardless of AC voltage phase. It does not incorporate internal zero-crossing detection. For zero-crossing operation, an external zero-crossing detector and timing controller must be added to the MCU firmware.

What is the maximum inductance this device can safely switch off?

ST specifies safe turn-off for inductive loads up to 15 H, validated under conditions where load current decays below holding current (IH ≤ 20 mA) and clamping voltage remains ≤ VCL (≥650 V). Loads exceeding 15 H risk incomplete energy dissipation and potential device failure due to excessive clamping time or voltage overshoot.