ACST6-7SR

Overview

The ACST6-7SR is an overvoltage protected AC power switch from STMicroelectronics, built on ASD technology. It integrates a triac structure with a high-voltage clamping device to absorb inductive turn-off energy and withstand line transients per IEC61000-4-5 standards. Key electrical parameters include VDRM/VRRM of +/- 700V, IT(RMS) of 1.5A (no heatsink, Tamb=40°C) or 6A (TCASE=105°C), and gate triggering current IGT < 10 mA. It features static dV/dt > 200 V/µs and snubberless commutation (dI/dt)c > 3.5A/ms. Available in D2PAK, I2PAK, TO-220FPAB, or TO-220 packages.

Feature Summary

• Integrates high-voltage clamping for overvoltage protection without external components
• Snubberless turn-off commutation capability
• High noise immunity with static dV/dt > 200 V/µs
• Direct microcontroller interface via low gate triggering current

Applications

• AC static switching in appliance and industrial control systems
• Induction motor drive actuator for refrigerator/freezer compressors
• Actuator for dishwasher spray pumps
• Actuator for clothes dryer tumble mechanisms
• Actuator for refrigerator or freezer thermostats

Procurement Notes

Verify the specific package variant required, as the ACST6-7SR series includes D2PAK, I2PAK, TO-220FPAB, and TO-220 options. Confirm that the application environment supports the thermal ratings associated with the chosen package configuration. Ensure compatibility with IEC61000-4-5 transient immunity requirements for the target system design.

Selection Notes

Select this component when integrated overvoltage protection is needed to reduce bill of materials count. Choose based on thermal management capabilities: use heatsink-dependent ratings for higher current loads. Verify that the snubberless operation meets the load's di/dt requirements. Ensure the logic-level gate sensitivity matches the driving microcontroller output voltage levels.

Part Context

The ACST6-7SR belongs to the AC power switch family utilizing ASD technology. It is designed for home appliances and industrial systems requiring robust AC switching with integrated protection. The device simplifies designs by embedding avalanche control, eliminating the need for separate varistors or snubber circuits typically required for inductive loads.

Replacement Considerations

Check datasheets for other ACST6 variants such as ACST6-7SG or ACST6-8FR. Verify pinout compatibility and thermal performance differences between packages like D2PAK and TO-220. Ensure substitute parts maintain the same IEC61000-4-5 compliance and gate trigger characteristics.