CI-28329-000

Overview

The CI-28329-000 is a rectangular receiver speaker manufactured by Knowles. It utilizes balanced armature technology and features a top port configuration. The component has an impedance of 140 Ohms and delivers a sensitivity of 131.5 dBA. Its frequency range spans from 200 Hz to 5.5 kHz. The physical dimensions are 9.47mm in length, 7.18mm in width, and a maximum installation height of 4.19mm. Termination is provided via solder pads.

Feature Summary

• Balanced armature technology for high efficiency audio output
• Top port design for directional sound projection
• Rectangular form factor with surface mount solder pad terminations

Applications

• Medical diagnostic equipment requiring high-fidelity audio alerts
• Industrial control panels needing clear status indicators
• Portable testing instruments demanding compact audio solutions

Procurement Notes

Verify current availability as this part may be subject to discontinuation or limited stock. Confirm that the 140 Ohm impedance matches your circuit requirements. Ensure the top port orientation aligns with your enclosure design. Check for RoHS3 compliance if required by your manufacturing standards. Consult official distributors for lead times and replacement options.

Selection Notes

Select this component when high sensitivity is critical within a small footprint. The 140 Ohm impedance suits specific driver circuits. Consider the 200 Hz to 5.5 kHz bandwidth for voice or alert tones. The balanced armature type offers superior performance compared to dynamic speakers in similar sizes. Verify mechanical clearance for the 4.19mm height constraint.

Part Context

This speaker belongs to Knowles' CI series of miniature receivers. It is designed for applications where space is limited but audio clarity is essential. The balanced armature architecture provides consistent performance across varying temperatures. It serves as a direct replacement for legacy components in existing medical and industrial designs.

Replacement Considerations

The CI-28512-017 is listed as a similar substitute. Verify compatibility regarding impedance, sensitivity, and mechanical dimensions before substitution. Ensure the replacement maintains the required frequency response for your application.