BJ-28411-000

Overview

The Knowles BJ-28411-000 is a magnetic analog microphone designed for noise suppression applications. It features a rectangular surface-mount package with side porting and pad termination. The device operates within a frequency range of 300 Hz to 5 kHz and has an impedance of 300 Ohms. Sensitivity is specified as -87dB ±5dB at 74dB SPL. Physical dimensions are 7.87mm in length, 5.59mm in width, and a maximum height of 4.06mm.

Feature Summary

• Magnetic transducer technology providing analog output signals
• Integrated noise suppression capability for improved signal clarity
• Side-port acoustic design optimized for specific mounting orientations
• Surface-mount construction utilizing solder pads for board integration

Applications

• Audio input devices requiring directional noise rejection
• Communication equipment utilizing analog microphone interfaces
• Portable electronic devices with limited internal volume constraints

Procurement Notes

Verify component status prior to procurement as the BJ-28411-000 is officially listed as End-of-Life (EOL) by the manufacturer. Confirm availability through authorized distributors or secondary markets. Ensure that any replacement components maintain identical electrical parameters, specifically sensitivity and impedance, to guarantee functional compatibility in existing designs.

Selection Notes

Select this component only if the design requires a magnetic analog microphone with specific noise suppression characteristics. Evaluate the physical footprint requirements against the 7.87mm x 5.59mm dimensions. Consider the side-port orientation during mechanical layout planning. Verify that the target application supports the 300 Ohm impedance load and operates within the specified 300 Hz to 5 kHz frequency response range.

Part Context

This part belongs to the Knowles BJ series of microphones. The series focuses on compact audio solutions for consumer electronics. The manufacturer specializes in precision audio components engineered for demanding environments. This specific model represents a legacy product within their portfolio, previously widely used in portable communication hardware before discontinuation.

Replacement Considerations

Public confirmed substitute part numbers are not available in the provided documentation due to the component's discontinued status. Designers must identify alternative magnetic analog microphones with matching sensitivity (-87dB), impedance (300 Ohms), and physical dimensions. Cross-referencing with current Knowles offerings or other manufacturers' noise-suppressing MEMS/magnetic microphones is required.