CI-28203-000

Overview

The Knowles CI-28203-000 is a balanced armature speaker transducer designed for compact audio applications. It features a rectangular top port configuration and operates within a frequency range of 200 Hz to 5.5 kHz. The device has an impedance of 174 Ohms and delivers a sound pressure level of 131.5 dB. Its physical depth is 4.1 mm, facilitating integration into space-constrained electronic devices requiring high-fidelity audio output.

Feature Summary

• Balanced armature transducer architecture for efficient audio reproduction
• Top rectangular port design for directional sound projection
• High sensitivity output suitable for low-power driving circuits

Applications

• Hearing aids and assistive listening devices
• Wireless communication headsets
• Compact portable audio players

Procurement Notes

Verify the specific impedance variant required, as sources indicate both 174 Ohm and 250 Ohm configurations exist under similar identifiers. Confirm the port orientation matches the mechanical design constraints. Ensure compatibility with the target application's acoustic chamber specifications before finalizing procurement orders.

Selection Notes

Select this component when high sound pressure levels are required in a minimal footprint. The 174 Ohm impedance suits specific driver circuits, while the 4.1 mm depth allows for slim form factors. Evaluate the 200 Hz to 5.5 kHz bandwidth against the necessary audio frequency response requirements of the end product.

Part Context

This part belongs to Knowles' portfolio of precision audio transducers. Balanced armature speakers are distinct from dynamic drivers, offering superior efficiency and clarity in small packages. This specific model represents a standard solution for consumer electronics where size and weight are critical design parameters.

Replacement Considerations

Direct substitutes may include other Knowles balanced armature speakers with matching 174 Ohm impedance and 4.1 mm depth. Verify that alternative models maintain the same top-port geometry and 131.5 dB sensitivity to ensure acoustic performance parity without redesigning the housing.