CI-28512-017

Overview

The Knowles CI-28512-017 is a top-port rectangular receiver utilizing balanced armature technology. It features a 140 Ohm impedance and delivers an efficiency of 131.5 dBA. The operational frequency range spans from 200 Hz to 5.5 kHz. Physical dimensions are 9.47mm in length, 7.18mm in width, with a maximum installation height of 4.19mm. The component utilizes pad termination for circuit connection.

Feature Summary

• Employs balanced armature transducer technology for audio reception
• Features a top port configuration for sound output directionality
• Constructed in a compact rectangular form factor suitable for space-constrained designs

Applications

• Audio receiver integration in portable electronic devices
• Communication equipment requiring high-efficiency acoustic output
• Hearing aid or assistive listening device components

Procurement Notes

This component has reached end-of-life status and is no longer manufactured by Knowles. Verification of current availability through authorized distributors is required, as stock levels may be limited or non-existent. Designers should confirm the obsolescence date against their specific project timelines to avoid supply chain disruptions during production phases.

Selection Notes

Engineers selecting this part must account for its discontinued status when planning long-term product lifecycles. The specific 140 Ohm impedance and 131.5 dBA sensitivity define the acoustic matching requirements for the host circuit. Alternative solutions should be evaluated if continuous production volume is necessary, considering the physical footprint and frequency response constraints of the original design.

Part Context

The CI-28512-017 belongs to the CI series of audio receivers produced by Knowles. This series typically focuses on balanced armature drivers designed for high fidelity and compact integration. The component represents a specific variant within the manufacturer's historical portfolio of acoustic transducers used in consumer and professional audio applications.

Replacement Considerations

The Knowles CI-28329-000 is listed as a similar replacement part. Engineers should verify electrical compatibility and mechanical fit before substitution.