CI-28352-000

Overview

The Knowles CI-28352-000 is a balanced armature speaker designed for audio applications. It features a rectangular shape with dimensions of 9.47mm in length, 4.1mm in depth, and a total height of 7mm (0.28 inch). The unit weighs 0.14g. Key electrical parameters include an impedance of 47Ω to 68Ω and a frequency response range extending up to 5.5kHz. The device delivers a sound pressure level (SPL) of 128 dB. It utilizes a side port configuration and is RoHS compliant.

Feature Summary

• Balanced armature transducer technology
• Side port acoustic design
• High sound pressure level output
• Compact rectangular form factor

Applications

• Hearing aids
• Earworn medical devices
• Personal audio equipment

Procurement Notes

Verify the specific impedance value required for your circuit design, as sources indicate both 47Ω and 68Ω variants. Confirm that the side port orientation matches your enclosure layout. Ensure the component meets the necessary RoHS compliance standards for your target market. Check datasheet specifications for mounting requirements and acoustic sealing needs to ensure optimal performance.

Selection Notes

Select this component when a high-output, compact balanced armature speaker is needed. The 128 dB SPL rating suits applications requiring significant volume from small enclosures. Consider the 47Ω or 68Ω impedance based on the driving circuit's capabilities. The 7mm height constraint makes it suitable for slim wearable designs where space is limited.

Part Context

This part belongs to Knowles' CI series of speakers. The series is known for providing high-fidelity audio in miniature packages. The CI-28352-000 specifically targets the hearing aid and personal health monitoring markets, offering a balance between acoustic performance and physical size constraints typical of these devices.

Replacement Considerations

Check for other parts within the Knowles CI series that share similar dimensions and impedance. Verify if alternative balanced armature speakers from other manufacturers meet the 128 dB SPL and 5.5kHz frequency requirements. Ensure any substitute maintains the side port configuration and 7mm height limit.