EF-28378-000

Speakers Overview

The Knowles EF-28378-000 is a high-performance electret condenser microphone capsule designed for precision audio capture. It features a back-electret design with a specific diaphragm construction optimized for sensitivity and frequency response characteristics suitable for professional communication devices. The component integrates a JFET impedance converter within the capsule housing to ensure low-noise signal transmission. Its physical dimensions and mounting configuration are engineered for integration into compact handheld transceivers and industrial communication headsets, providing reliable acoustic performance in demanding operational environments.

Speakers Feature Summary

• Back-electret condenser technology for consistent acoustic sensitivity
• Integrated JFET impedance converter for low-noise output
• Robust mechanical construction for durability in harsh environments

Speakers Applications

• Professional two-way radio handsets
• Industrial communication headsets
• Public address system microphones

Speakers Procurement Notes

Verify the exact part number suffix against the manufacturer's current datasheet to confirm pinout compatibility and acoustic specifications. Ensure that the procurement channel provides original packaging with traceability documentation. Cross-reference the manufacturing date code to guarantee compliance with current RoHS directives and material safety standards required for your specific deployment region.

Speakers Selection Notes

Select this component when a fixed-form factor electret capsule is required for direct replacement or new design-in scenarios involving standard radio microphone interfaces. Evaluate the acoustic power requirements of the host device to ensure the capsule's output level matches the preamplifier input sensitivity. Confirm mechanical clearance constraints within the handset or headset assembly prior to finalizing the selection.

Speakers Part Context

This model belongs to Knowles' specialized line of miniature microphone capsules tailored for the communications industry. It represents a legacy but widely adopted solution for analog audio input stages in professional radio equipment. The product line emphasizes reliability and standardized form factors to facilitate easy integration into existing hardware architectures without requiring significant redesign of the acoustic chamber.

Speakers Replacement Considerations

Direct replacements must match the original electrical pinout and mechanical footprint exactly. Verify that substitute components maintain identical frequency response curves to preserve voice intelligibility. Consult official substitution lists from Knowles or authorized distributors to identify equivalent models with updated manufacturing processes.