PFD-21A29WQ

Overview

The PFD-21A29WQ is an industrial-grade audio indicator manufactured by Mallory Sonalert Products Inc. It operates on a DC voltage range of 3 to 24V and draws a current of 25mA. The device produces a sound pressure level of 85dB at a distance of 10cm with a constant tone frequency of 2.9kHz. It features a compact rectangular form factor measuring 24mm in length, 14mm in width, and 9.5mm in height. The unit utilizes wire lead termination for connection and is designed for panel mounting applications.

Feature Summary

• Integrated internal driver circuitry eliminates the need for external oscillators
• Compact rectangular housing suitable for space-constrained industrial panels
• Constant tone acoustic output for steady state indication
• Wide DC operating voltage range for flexible power integration

Applications

• Industrial control panel status indication
• Equipment fault signaling systems
• Process monitoring alarm interfaces
• Automated machinery operational alerts

Procurement Notes

Verify the specific suffix WQ against the official Mallory Sonalert datasheet to confirm terminal configuration and acoustic specifications. Ensure the input power supply matches the 3-24VDC requirement. Confirm that the 85dB SPL rating meets the environmental noise requirements of the installation site. Check for RoHS compliance documentation if required by project standards.

Selection Notes

Select this component when a low-profile, constant-tone audible alert is required for DC-powered systems. The 24x14mm footprint allows for dense panel layouts. Consider the 85dB output level relative to ambient noise conditions. Verify that wire lead termination is compatible with the assembly method compared to PCB mount alternatives.

Part Context

This part belongs to the PFD series of industrial audio indicators from Mallory Sonalert. The series is characterized by robust construction for harsh environments and integrated driving electronics. It serves as a standard solution for visual-audible warning systems in automation and manufacturing sectors where reliable signal generation is critical.

Replacement Considerations

Consult the official Mallory Sonalert cross-reference guide for verified substitutes. Ensure replacement parts match the 24x14mm dimensions and 3-24VDC electrical parameters. Verify identical acoustic output characteristics and termination styles before implementation.