PL-21N31PLQ

Overview

The PL-21N31PLQ is a piezoelectric audio indicator manufactured by Mallory Sonalert Products Inc. It operates on a rated voltage of 12 VDC with a current draw of 12 mA. The device produces a slow pulse tone at a frequency of 3 kHz and achieves a sound pressure level of 80 dB. Designed for through-hole mounting, it features solder pin termination and measures 24 mm in diameter with a height of approximately 14 mm. The unit is internally driven and complies with RoHS3 standards.

Feature Summary

• Internally driven piezoelectric technology for simplified circuit integration
• Slow pulse acoustic output pattern for distinct auditory signaling
• Through-hole construction with solder pin termination for secure board attachment

Applications

• Industrial control panel status indication
• Appliance operational alerts
• Electronic equipment fault signaling

Procurement Notes

Verify the specific ordering suffix to confirm physical dimensions and lead time requirements. Ensure the selected variant matches the required mounting style and terminal type for your PCB layout. Confirm compliance certifications such as RoHS3 are included in the shipment documentation. Cross-reference the manufacturer part number with distributor catalogs to avoid confusion between similar series models.

Selection Notes

Select this component when an internally driven, slow-pulse audible alert is required for 12 VDC systems. The 80 dB output provides clear indication without excessive noise pollution. The through-hole package suits prototyping or high-reliability applications where mechanical stability is prioritized over surface area constraints. Verify that the 3 kHz frequency aligns with human hearing sensitivity for optimal audibility.

Part Context

This part belongs to the PL series of piezoelectric buzzers from Mallory Sonalert. The PL series is characterized by internally driven designs that simplify driver circuitry. The PLQ suffix typically denotes a specific packaging or terminal configuration within the broader product line, distinguishing it from wire-lead or other mounting variants.

Replacement Considerations

Direct substitutes include PL-21N31PQ for identical electrical performance with bulk packaging. For flange-mounted alternatives, consider PL-21N30WQ. Always verify dimensional compatibility and terminal pitch before substituting.