EF-27505-000

Speakers Overview

The Knowles EF-27505-000 is a rectangular piezoelectric receiver speaker designed for audio signal transmission. It features a self-resonant frequency of 6.3 kHz and an impedance of 636 Ohms. The device delivers a sound pressure level of 126.5 dBA at the resonant frequency. Physical dimensions are 7.87 mm in length, 5.59 mm in width, and 4.01 mm in height. It utilizes solder pad termination for surface mount integration.

Speakers Feature Summary

• High acoustic output capability with a sensitivity rating of 126.5 dBA
• Optimized performance at a specific self-resonant frequency of 6.3 kHz
• Compact rectangular form factor suitable for space-constrained designs
• Surface mount construction with solder pad terminations

Speakers Applications

• Audio signaling in portable electronic devices
• Alarm systems requiring high-decibel output
• Consumer electronics with limited internal volume
• Industrial control panels needing audible feedback

Speakers Procurement Notes

Verify the specific port configuration (top or side) required for your enclosure design, as datasheets may list variations. Confirm RoHS compliance status with the supplier prior to ordering. Ensure the PCB footprint matches the 7.87 x 5.59 mm dimensions. Check for any specific handling requirements during assembly due to the piezoelectric nature of the component.

Speakers Selection Notes

Select this component when a high-sensitivity, low-profile receiver is needed for short-range audio alerts. The 636 Ohm impedance requires appropriate driver circuitry matching. Consider the 6.3 kHz resonance peak for tone generation rather than wideband audio reproduction. Evaluate mechanical mounting constraints against the 4.01 mm height profile.

Speakers Part Context

This part belongs to Knowles' line of miniature piezoelectric receivers. These components are engineered for applications demanding significant sound pressure from minimal physical size. They differ from dynamic speakers by their reliance on piezoelectric materials for vibration generation, offering robustness and efficiency at specific frequencies.

Speakers Replacement Considerations

Check for direct substitutes within the Knowles EF series that share identical electrical parameters. Verify dimensional compatibility if replacing with parts from other manufacturers. Ensure the replacement maintains the 636 Ohm impedance to avoid driver mismatch issues.

Speakers FAQ

What is the operating frequency range?

The component is optimized for a self-resonant frequency of 6.3 kHz.

How is the component terminated?

It uses solder pads for surface mount technology (SMT) installation.