BK-21839-000

Overview

The Knowles BK-21839-000 is a balanced armature receiver designed for audio applications. It features a frequency range of 200 Hz to 6 kHz and an impedance of 750 Ohms. The device exhibits a sensitivity of 127 dBA. Its physical dimensions are 7.87 mm in length and 5.59 mm in width, utilizing solder pads for surface mount installation.

Feature Summary

• Balanced armature technology for high-efficiency sound reproduction
• Wide frequency response covering 200 Hz to 6 kHz
• Compact surface-mount package with side port design

Applications

• Hearing aid receivers
• Bone conduction transducers
• Specialty audio devices

Procurement Notes

Verify the specific impedance rating during procurement, as sources indicate variations between 380 Ohms and 750 Ohms for this part number. Confirm that the component is RoHS compliant and lead-free. Ensure compatibility with the intended PCB footprint given the 7.87 mm x 5.59 mm dimensions. Check for magnetic material specifications if used in sensitive environments.

Selection Notes

Select this component when high sensitivity (127 dBA) is required within a compact form factor. The 750 Ohm impedance suits specific driver circuits, though verification against 380 Ohm variants is necessary. Consider the side-port configuration for acoustic integration. This balanced armature type is suitable for applications demanding precise audio fidelity in small enclosures.

Part Context

Knowles is recognized as the originator of balanced armature technology. The BK-21839-000 belongs to their line of receivers and specialty transducers. This component is distinct from general-purpose speakers, focusing on high-efficiency performance for hearing aids and specialized audio equipment.

Replacement Considerations

Public confirmed substitute part numbers are not available in the provided documentation. Verify mechanical and electrical compatibility carefully before considering alternative balanced armature receivers.