EF-21933-000

Speakers Overview

The Knowles EF-21933-000 is a rectangular receiver speaker designed for audio signal reproduction. It features a nominal impedance of 1.275 kOhms and operates within a frequency range of 200 Hz to 6.3 kHz. The component utilizes a side port configuration for acoustic output. It is RoHS compliant and lead-free, suitable for surface mount applications requiring high reliability in compact electronic assemblies.

Speakers Feature Summary

• Rectangular form factor optimized for space-constrained designs
• High impedance specification of 1.275 kOhms for specific driver compatibility
• Side port acoustic design for directed sound projection

Speakers Applications

• Medical diagnostic equipment requiring precise audio feedback
• Industrial control panels with limited internal volume
• Portable communication devices needing reliable voice transmission

Speakers Procurement Notes

Verify the specific port orientation (side vs. top) against the mechanical drawing, as variants exist within the EF series. Confirm impedance matching with the driving circuitry, as 1.275 kOhms is non-standard compared to common 8 or 16 Ohm speakers. Ensure the mounting footprint aligns with the official outline drawing to prevent assembly errors.

Speakers Selection Notes

Select this component when high impedance is required to interface directly with certain amplifier outputs without additional transformers. The rectangular shape allows for efficient use of board real estate compared to circular equivalents. Consider the 200 Hz lower frequency limit when designing for full-range audio requirements.

Speakers Part Context

This part belongs to the Knowles EF series of miniature receiver speakers. These components are engineered for high reliability in harsh environments. The series typically offers consistent performance across temperature ranges, making them suitable for commercial and industrial electronics where long-term stability is critical.

Speakers Replacement Considerations

Check datasheets for alternative parts with identical 1.275 kOhm impedance and similar frequency response curves. Mechanical dimensions must match exactly to fit existing enclosures. Verify that the replacement maintains the same side port configuration if directional audio is required.