ACS108-5SA-TR

Overview

The ACS108-5SA-TR is a logic-level gate AC switch manufactured by STMicroelectronics, designed for alternating current static switching applications. It features a TO-92 package with three pins and supports through-hole mounting. The device has a repetitive peak off-state voltage of 500 V and a nominal RMS on-state current of 0.8 A. Key electrical parameters include a maximum gate triggering current of 10 mA and a clamping voltage of 600 V. It operates within a junction temperature range of -30°C to +125°C and withstands non-repetitive line peak pulse voltages up to 2 kV.

Feature Summary

• Integrates an overvoltage crowbar structure to absorb inductive turn-off energy without external protection components.
• Features a gate level shifter driver that separates the digital controller from the main switch to prevent gate kickback.
• Capable of direct interface with microcontrollers due to low gate triggering current requirements.
• Provides high noise immunity against static dV/dt and complies with IEC 61000-4-5 surge standards.

Applications

• AC on-off static switching in appliance control systems
• Drive of low power high inductive or resistive loads such as valves, solenoids, and dispensers
• Control of pumps, fans, micro-motors, and defrost heaters

Procurement Notes

Verify component authenticity by checking manufacturer markings against official datasheet specifications. Confirm package type matches the required TO-92 form factor. Ensure the ordering suffix corresponds to the tape and reel delivery mode if automated assembly is planned. Cross-reference part numbers with authorized distributors to avoid obsolete stock.

Selection Notes

Select this component for applications requiring direct microcontroller interfacing without additional isolation circuitry. Consider the 0.8 A RMS current rating when sizing for resistive or low-inductive loads. Evaluate thermal management requirements based on ambient temperature conditions, as current derating applies above 60°C. Verify compatibility with the negative gate trigger current requirement for proper logic level driving.

Part Context

The ACS108-5SA-TR belongs to the ASD™ AC Switch Family built around A.S.D.® technology. This series includes variants with different voltage ratings and packages, such as the SOT-223 version. The family is characterized by integrated overvoltage protection and sensitive gate drive capabilities, targeting low-power AC load switching in household appliances and industrial controls.

Replacement Considerations

Check for availability of ACS108-5SA bulk packaging if reel supply is not required. Verify if higher voltage variants like ACS108-6SA are suitable for increased blocking voltage needs. Consider the SOT-223 packaged ACS108-5SN for surface mount applications requiring multiple devices on a common cooling pad.

FAQ

How is the ACS108-5SA-TR triggered?

The device is triggered with a negative gate current flowing out of the gate pin, allowing direct connection to digital controllers.

Does the ACS108-5SA-TR require external snubber circuits?

No external protection snubbers or varistors are required due to the integrated high voltage clamping structure and overvoltage crowbar feature.

What is the maximum non-repetitive surge current?

The non-repetitive surge peak on-state current is 7.3 A at 50 Hz and 8 A at 60 Hz.