ACS108-8SA

Overview

The ACS108-8SA is an overvoltage protected AC switch built with ASD technology, designed to control loads up to 0.8 A RMS. It features an integrated overvoltage crowbar structure to absorb inductive turn-off energy and a gate level shifter driver for digital controller isolation. Triggered by negative gate current, it operates within a junction temperature range of -30 °C to +125 °C. Key electrical parameters include a maximum on-state RMS current of 0.45 A at Tamb = 64 °C or 0.8 A at Ttab = 76 °C, a non-repetitive surge peak current of 13.7 A (tp = 16.7 ms), and blocking voltages VDRM/VRRM of 800 V. The device requires a maximum gate trigger current (IGT) of 10 mA and voltage (VGT) of 1.0 V.

Feature Summary

• Enables equipment compliance with IEC 61000-4-5 surge standards through overvoltage crowbar technology
• Provides high noise immunity against static dV/dt and IEC 61000-4-4 burst events
• Eliminates the need for external protection snubbers or varistors
• Interfaces directly with microcontrollers while reducing component count significantly

Applications

• Alternating current on/off static switching in appliances and industrial control systems
• Driving low power high inductive loads such as relays, valves, solenoids, and dispensers
• Controlling resistive loads including lamps, fans, pumps, and door locks

Procurement Notes

Verify the specific ordering suffix to confirm packaging configuration, as the base model supports bulk, tape and reel, and ammopack variants. Confirm environmental compliance status via ECOPACK specifications before finalizing procurement. Ensure design accounts for thermal derating curves relative to ambient temperature and mounting conditions to maintain safe operating limits.

Selection Notes

Select this component for applications requiring direct microcontroller interface without additional isolation circuitry. Evaluate thermal management requirements carefully, as RMS current capability varies significantly between natural convection and tab-mounted cooling scenarios. Verify that load inductance levels are compatible with the internal clamping voltage to ensure reliable turn-off commutation without external snubber networks.

Part Context

The ACS108-8SA belongs to the ACS series of overvoltage protected AC switches manufactured by STMicroelectronics. It utilizes ASD technology to integrate protection mechanisms directly into the silicon die. This family is distinct from standard triacs by offering inherent surge ruggedness and simplified drive requirements, targeting compact designs in consumer and industrial AC switching applications.

Replacement Considerations

Direct functional substitutes within the same series include the ACS108-8SN and ACS108-8TN, which share identical electrical ratings and pinout configurations. Verify package compatibility when swapping between surface-mount and through-hole variants.