PFD-27N35WQ

Overview

The PFD-27N35WQ is an internally driven piezoelectric audio indicator manufactured by Mallory Sonalert. It operates within a voltage range of 3 to 28 VDC, with a rated voltage of 12 VDC and a maximum current consumption of 15 mA. The device produces a continuous tone at a frequency of 3.5 kHz, delivering a sound pressure level of 90 dB. It features wire lead termination and flange mount installation, with physical dimensions of 30 mm in diameter and 16 mm in height.

Feature Summary

• Internally driven piezoelectric design for direct connection
• Wide operating voltage range supporting 3 to 28 VDC input
• Continuous tone output at 3.5 kHz frequency
• Flange mount configuration with wire lead termination

Applications

• Industrial equipment status indication
• Control panel alarm signaling
• High-voltage DC system monitoring
• Panel-mounted audio alerts

Procurement Notes

Verify the specific oscillation tolerance and acoustic performance against the official Mallory Sonalert datasheet before integration. Confirm that the 3-28 VDC operating range aligns with the target circuit supply. Ensure mechanical compatibility with the designated flange mounting hole size and depth to guarantee secure installation.

Selection Notes

Select this component when a wide DC input range is required without external driving circuitry. The internal drive mechanism simplifies board layout compared to passive buzzers. Consider the 90 dB output level for environments requiring clear audible alerts. Verify that the 15 mA current draw fits within the available power budget of the control system.

Part Context

This part belongs to the PFD series of industrial-grade audio indicators from Mallory Sonalert. These devices are designed for robust performance in demanding environments. The series offers various tone patterns and voltage options, providing flexibility for different industrial signaling requirements while maintaining consistent acoustic output standards.

Replacement Considerations

Cross-reference with PLD-27N35WQ for similar form factor applications. Verify electrical parameters and mounting dimensions against alternative Mallory Sonalert models to ensure functional equivalence. Check datasheets for any differences in sound pressure levels or operating voltage ranges.