AST0840MFD-4.4Q

Overview

The AST0840MFD-4.4Q is an externally driven electromagnetic buzzer manufactured by Mallory Sonalert Products Inc. It operates at a resonant frequency of 4 kHz with a sound pressure level of 105 dB measured at 10 cm using a 4.4 V drive voltage. The device draws a current rating of 140 mA and features through-hole solder pad termination for PCB mounting. Its physical dimensions are approximately 14 mm x 11 mm x 3 mm, constructed with a plastic cone material.

Feature Summary

• Externally driven magnetic transducer design
• High acoustic output capability
• Surface or through-hole compatible termination

Applications

• General purpose audible alarms
• Industrial control panel indicators
• Consumer appliance status signaling

Procurement Notes

Verify the specific suffix (Q vs TRQ) to confirm package type, as Q denotes through-hole while TRQ indicates surface mount. Confirm drive voltage requirements match the 4.4 V specification for optimal performance. Ensure mechanical clearance accommodates the 14x11x3 mm footprint. Check RoHS compliance documentation for regulatory adherence in restricted substance environments.

Selection Notes

Select this component when high volume audible indication is required without internal driver circuitry. Compare against piezoelectric alternatives if lower power consumption is critical, as this electromagnetic unit requires higher current. Consider the 4 kHz tone for distinctiveness in noisy environments. Evaluate mounting constraints regarding the solder pad configuration versus panel mount options.

Part Context

This part belongs to the AST series of electromagnetic buzzers from Mallory Sonalert. These components are designed for cost-effective, high-volume applications requiring reliable acoustic signaling. The series offers various frequencies and sound levels to suit different alerting needs across industrial and consumer electronics sectors.

Replacement Considerations

Direct substitutes include the AST0840MFD-4.4TRQ for surface mount variants. Cross-reference with other 4 kHz electromagnetic buzzers from the same manufacturer if mechanical pinout compatibility is maintained. Verify that replacement parts meet the same 105 dB SPL requirement at equivalent drive conditions.