BJ-28471-000

Overview

The Knowles BJ-28471-000 is an omnidirectional electret microphone designed for audio signal capture. It features a solder pad termination type and operates with an output impedance of 150 Ohms at 1 kHz. The device provides a sensitivity level of -90 dBA. Its physical dimensions are 7.87 mm in length, 5.59 mm in width, and 4 mm in depth. The component belongs to the BJ series and is compliant with RoHS standards.

Feature Summary

• Omnidirectional acoustic design for uniform sound pickup
• Solder pad termination for direct board mounting
• Low output impedance suitable for standard audio interfaces

Applications

• Consumer electronic audio input devices
• Voice recognition systems
• Portable communication equipment

Procurement Notes

Verify the specific revision and manufacturing date code against current production schedules. Confirm that the solder pad footprint matches the target PCB layout. Ensure environmental compliance documentation aligns with regional regulatory requirements for the intended market.

Selection Notes

Select this component when an omnidirectional response is required for general voice capture. The low impedance specification facilitates integration with standard preamplifier circuits. Consider the physical profile constraints as the unit has a defined height of 4 mm.

Part Context

This microphone is part of the Knowles BJ series, which focuses on compact audio solutions. The series supports various form factors for embedded audio applications. Knowles manufactures these components using established thin-film or bulk micromachining techniques typical for their product line.

Replacement Considerations

Consult official substitution guides for compatible omnidirectional microphones with matching impedance and sensitivity profiles.