ACS108-5SA-AP

Overview

The ACS108-5SA-AP is a logic-level gate AC switch from STMicroelectronics, designed for alternating current static switching. It features an integrated high-voltage clamping structure to absorb inductive turn-off energy and a gate level shifter driver that isolates the digital controller from the main switch. The device operates with a negative gate current flowing out of the gate pin. Key electrical parameters include a repetitive peak off-state voltage (VDRM/VRRM) of 500 V, a nominal RMS on-state current (IT(RMS)) of 0.8 A, and a maximum gate triggering current (IGT) of 10 mA. It supports a non-repetitive surge peak on-state current of up to 7.3 A at 50 Hz and functions within a junction temperature range of -30°C to +125°C.

Feature Summary

• Integrated overvoltage protection via high-voltage clamping structure to absorb inductive turn-off energy
• Logic-level gate sensitivity allowing direct interface with microcontrollers without external drivers
• Gate level shifter driver separates the digital controller from the main power switch
• High noise immunity against static dV/dt and compliance with IEC61000-4-5 surge standards

Applications

• AC on-off static switching in appliance control systems
• Driving low power high inductive or resistive loads such as solenoids, valves, relays, and dispensers
• Control of pumps, fans, micro-motors, and defrost heaters
• Washing machines, dishwashers, tumble dryers, refrigerators, water heaters, and cookware

Procurement Notes

Verify component authenticity through authorized distribution channels. Confirm package type matches design requirements, as the ACS108 series includes TO-92 and SOT-223 variants. Check datasheet revisions for updates on marking information and thermal characteristics. Ensure compatibility with system voltage ratings and load types before integration.

Selection Notes

Select this component for applications requiring direct microcontroller interfacing with minimal external circuitry. The 500 V blocking voltage suits standard AC line applications. Consider the 0.8 A RMS current rating for low-power loads. Verify thermal management needs based on ambient temperature and copper surface area under the tab if using SOT-223 packages.

Part Context

The ACS108-5SA-AP belongs to the ASD™ AC Switch Family built around A.S.D.® technology. This family provides high-performance switches capable of controlling loads up to 0.8 A. The series integrates overvoltage crowbar structures and gate level shifters to simplify designs by eliminating external snubbers or varistors, reducing component count significantly compared to traditional triac solutions.

Replacement Considerations

Public confirmed substitute part numbers are not available in the provided documentation.