ACS108-8SA-AP

Overview

The ACS108-8SA-AP is an overvoltage protected AC switch manufactured by STMicroelectronics, utilizing A.S.D.® technology in a TO-92 package. It features an on-state RMS current of 0.45 A at 64 °C ambient or 0.8 A at 76 °C tab temperature, with a blocking voltage of 800 V. The device supports non-repetitive surge peak currents up to 13.7 A and operates within a junction temperature range of -30 °C to +125 °C. Triggered by negative gate current, it has a maximum gate trigger current of 10 mA and voltage of 1.0 V. The AP suffix indicates Ammopack packaging containing 2000 pieces.

Feature Summary

• Integrates overvoltage crowbar technology to absorb inductive turn-off energy and withstand mains transients up to 2 kV.
• Provides high noise immunity against static dV/dt and IEC 61000-4-4 burst requirements without external snubbers.
• Features a gate level shifter driver that separates the digital controller from the main switch for direct microcontroller interfacing.

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 the packaging format, as the AP designation corresponds to Ammopack delivery. Ensure compatibility with existing PCB footprints for the TO-92 case style. Confirm environmental compliance status via official documentation before finalizing procurement specifications.

Selection Notes

Select this component when designing circuits requiring integrated overvoltage protection to eliminate external varistors or snubber networks. The logic-level gate sensitivity allows direct connection to standard microcontrollers. Verify thermal management requirements based on the specific mounting conditions and expected RMS load currents.

Part Context

This part belongs to the ACS™ series of AC switches built with A.S.D.® technology. It is designed for applications needing robust commutation capabilities and simplified bill of materials. The series targets appliance actuators and general-purpose AC switching where high reliability and noise immunity are critical.

Replacement Considerations

The ACS108-8SA-TR (Tape and Reel) and ACS108-8SA (Bulk) share identical electrical characteristics and pinouts. These variants serve as functional replacements differing only in shipping packaging configuration.

FAQ

How does the ACS108 handle overvoltage during the switch-off of inductive loads?

It utilizes an internal overvoltage clamping structure that absorbs the energy generated by the inductive load, limiting the voltage spike to the clamping voltage VCL.

What is the mechanism for triggering the gate?

The device is triggered by a negative gate current flowing out of the gate pin, allowing it to interface directly with digital controllers.

Does the device require external protection components?

No, the integrated overvoltage crowbar and high dV/dt immunity eliminate the need for external snubbers or varistors in most applications.