EF-21935-000

Speakers Overview

The Knowles EF-21935-000 is a balanced armature receiver designed for surface mount applications. It features a rectangular package with dimensions of 7.87 x 5.59 x 4.01 mm and utilizes a top port configuration. The component operates within a frequency range of 200 Hz to 6.3 kHz and has an impedance of 327 Ohms. It delivers a sensitivity of 125 dB, making it suitable for high-output audio requirements in compact electronic devices.

Speakers Feature Summary

• Balanced armature transducer technology for efficient sound reproduction
• Top port design for directed acoustic output
• Rectangular surface mount form factor for space-constrained layouts

Speakers Applications

• Mobile communication handsets
• Wireless headsets and earpieces
• Portable medical audio devices

Speakers Procurement Notes

Verify the specific port orientation (top vs. side) required by your mechanical design, as datasheets may list variations. Confirm impedance matching with the driving circuit to ensure optimal power transfer and sound quality. Ensure the PCB footprint matches the 7.87 x 5.59 mm outline. Check RoHS compliance status if operating in regulated markets.

Speakers Selection Notes

Select this component when a high-sensitivity, low-power balanced armature receiver is needed. The 327 Ohm impedance suits specific driver circuits. Consider the 125 dB sensitivity for loudness requirements. The rectangular shape aids in dense board placement compared to circular alternatives.

Speakers Part Context

This part belongs to Knowles' line of precision audio receivers. Balanced armature speakers are preferred in hearing aids and mobile devices for their small size and high efficiency. The EF series typically offers consistent performance across temperature ranges.

Speakers Replacement Considerations

Check for direct substitutes from Knowles such as the EF-21937-000, noting differences in porting or sensitivity. Verify that any replacement maintains the same impedance and physical footprint to avoid redesigning the PCB or acoustic chamber.