WBFK-23990-000

Overview

The Knowles WBFK-23990-000 is a wideband balanced armature speaker designed for compact audio applications. It features a rectangular shape with dimensions of 5.15mm x 2.96mm x 2.58mm and an impedance of 57 Ohms. The frequency range spans from 200 Hz to 7.6 kHz, with a self-resonant frequency not specified in available documentation. The device offers an efficiency of 91 dB SPL at 1kHz/1mW and utilizes top porting for sound output.

Feature Summary

• Utilizes balanced armature technology for high efficiency and stability
• Compact rectangular form factor suitable for space-constrained designs
• Wideband frequency response capability
• Top port configuration for directed sound output

Applications

• High-end portable electronic devices
• Professional audio systems
• Premium headphones
• Hearing aids

Procurement Notes

Verify the specific datasheet version when sourcing, as component revisions may occur. Confirm RoHS compliance status directly with the manufacturer or authorized distributors prior to integration. Ensure that the top port orientation aligns with your acoustic enclosure design requirements to maintain the specified 91 dB efficiency performance.

Selection Notes

Select this component when a small footprint is critical alongside high acoustic output. The 57 Ohm impedance requires matching with appropriate driver circuits. Consider the 200 Hz to 7.6 kHz bandwidth limitations if full-range audio reproduction is required without additional equalization or supplementary drivers.

Part Context

This model belongs to the FK Series of speakers from Knowles. It represents a specialized solution within their audio product portfolio, focusing on miniaturized transducers. The series is engineered to meet the demands of modern wearable and portable electronics where size and power efficiency are paramount constraints.

Replacement Considerations

No public confirmed substitute part numbers are available in the provided documentation. Consult Knowles engineering for potential alternatives if this specific model becomes unavailable.