PLD-21N30PQ

Overview

The PLD-21N30PQ is a piezoelectric audio indicator from the Mallory Sonalert PLD series. It operates on a 3-28 VDC supply with a nominal rating of 12 VDC and draws 12 mA. The device produces an 80 dB dual-tone signal at 3 kHz in a constant or slow pulse mode. It features wire lead termination and flange mount installation. Physical dimensions are 24 mm diameter by 9.5 mm length.

Feature Summary

• Piezoelectric construction for reliable industrial audio indication
• Dual-tone output capability for distinct alert identification
• Wide operating voltage range supporting 3 to 28 VDC systems
• Flange mount design with wire lead connections

Applications

• Industrial machinery status monitoring
• Control panel alarm signaling
• Equipment fault detection systems
• Safety warning indicators

Procurement Notes

Verify the exact suffix against official Mallory Sonalert documentation, as 'PQ' variants may differ in tone or mounting specifics compared to similar PLD models. Confirm RoHS compliance status directly with the manufacturer datasheet before integration. Ensure the wire lead configuration matches your assembly requirements. Cross-reference the specific part number to avoid confusion with the PLD-21N30WQ variant which shares similar electrical parameters but may have different physical attributes.

Selection Notes

Select this component when a compact 24 mm piezoelectric indicator is required for 12 VDC industrial environments. The dual-tone feature distinguishes it from single-tone alternatives. Verify that the flange mount style suits the enclosure design. Compare current draw and sound pressure level against system noise floor requirements to ensure audibility.

Part Context

This unit belongs to the PLD series of industrial-grade piezoelectric buzzers. The series is characterized by robust construction suitable for harsh environments. Similar models include the PLD-21N31PQ and PLD-20A35EWQ, which share the same family characteristics but vary in dimensions and acoustic output specifications.

Replacement Considerations

Publicly confirmed substitute part numbers are not available in the provided source material.