BW-21789-000

Overview

The Knowles BW-21789-000 is an electret condenser microphone designed for analog audio applications. It features a noise-canceling configuration with a sensitivity of -55 dBA ±4dB at 74dB SPL. The device operates within a frequency range of 100 Hz to 4 kHz and requires a supply voltage between 1.3 V and 10 V, drawing a current rating of 50 µA. It presents an impedance of 3.5 kOhms and utilizes SMD/SMT solder pad termination for surface mount integration.

Feature Summary

• Noise-canceling design for improved signal clarity
• Analog output type suitable for standard audio circuits
• Electret condenser transducer technology
• Surface mount solder pad termination

Applications

• Voice recognition systems
• Consumer electronics audio input
• Telecommunication devices
• Portable recording equipment

Procurement Notes

Verify the specific suffix codes against official Knowles documentation to ensure correct packaging and tolerance specifications. Confirm RoHS compliance status as indicated in the latest datasheet revisions. Ensure the procurement channel provides authentic components from authorized distributors to prevent counterfeit risks. Cross-reference the part number with the manufacturer's current inventory lists for availability confirmation.

Selection Notes

Select this component when a compact, low-power analog microphone with noise cancellation is required. The wide operating voltage range allows flexibility in power supply design. Verify that the target application fits within the specified 100 Hz to 4 kHz frequency response. Ensure the PCB layout supports the required SMD solder pad footprint and thermal management for the electret element.

Part Context

This microphone belongs to the BW series produced by Knowles Electronics. The series focuses on providing reliable acoustic solutions for consumer and industrial markets. The BW-21789-000 specifically addresses needs for clear voice capture in space-constrained environments. It represents a standard offering in Knowles' portfolio of electret condenser microphones.

Replacement Considerations

Consult official Knowles substitution guides for verified equivalents. Generic replacements may not match the specific -55 dBA sensitivity or 3.5 kOhm impedance characteristics. Ensure any substitute maintains the same noise-canceling functionality and analog output format.