PF-21A31PQ

Overview

The PF-21A31PQ is a piezoelectric buzzer from Mallory Sonalert, designed for board-mount applications. It operates on a 12 VDC nominal voltage with a range of 3 to 24 VDC and draws 18 mA. The device produces a fast pulse tone at a frequency of 3 kHz with an acoustic output of 85 dBA. It features solder pin termination and through-hole mounting. The physical dimensions are 24 mm in diameter by 14 mm in height.

Feature Summary

• Generates a fast pulse audio signal using piezoelectric technology
• Supports wide DC input voltage ranges for flexible integration
• Designed for direct through-hole PCB mounting via solder pins

Applications

• Electronic equipment status indication
• General purpose alarm signaling
• Control panel audio alerts

Procurement Notes

Verify the specific operating mode matches the design requirement, as this component provides a fast pulse output rather than a continuous tone. Confirm that the 12 VDC nominal rating aligns with the system power supply. Ensure the through-hole footprint and solder pin configuration fit the target PCB layout. Check RoHS compliance documentation if required by project specifications.

Selection Notes

Select this component when a distinct, intermittent alert is preferred over a continuous sound. The 85 dBA output level is suitable for moderate noise environments. The compact 24 mm form factor allows for installation in space-constrained enclosures. Consider the 18 mA current draw when calculating total system power consumption.

Part Context

This part belongs to the Mallory Sonalert line of audio indicators. It is functionally similar to the PK-21A31PQ but differs in its pulse modulation type. The PL-21N31PQ offers a slow pulse variant within the same series. These components share common mechanical dimensions but vary in electrical drive characteristics.

Replacement Considerations

The PK-21A31PQ serves as a related alternative within the same product family, though it provides a continuous tone instead of a fast pulse. Designers must account for the difference in acoustic pattern when substituting.