BL-21671-000

Overview

The Knowles BL-21671-000 is a high-performance electret condenser microphone element designed for precision audio capture applications. 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 housing to ensure low-noise signal transmission. Its physical dimensions and mounting configuration allow for integration into compact acoustic assemblies requiring reliable sound pickup in demanding environments.

Feature Summary

• Back-electret condenser technology for consistent acoustic performance
• Integrated JFET impedance matching circuitry for signal integrity
• Optimized diaphragm design for targeted frequency response

Applications

• Professional two-way radio handsets
• Headset microphone modules
• Industrial communication equipment

Procurement Notes

Verify the exact datasheet revision and mechanical drawing against the specific procurement requirement. Confirm that the acoustic porting and mounting hole patterns match the target assembly design. Ensure environmental specifications such as humidity and temperature tolerance align with the intended operational context. Request sample units for acoustic testing before committing to volume production orders.

Selection Notes

Select this component when a compact, high-sensitivity electret solution is required for voice-grade applications. Evaluate the mechanical fitment constraints and acoustic loading conditions of the host device. Compare the specific polar pattern and sensitivity metrics against competing elements to ensure compatibility with the system's preamplifier stage and noise floor requirements.

Part Context

This part belongs to Knowles' portfolio of precision microphone elements used in communication hardware. It represents a standard offering for OEMs designing handheld transceivers and headsets where size and acoustic clarity are critical. The product line emphasizes reliability and consistent manufacturing tolerances for mass-produced audio interfaces.