BT-21835-000

Overview

The Knowles BT-21835-000 is an analog electret condenser microphone designed for voice applications. It operates within a frequency range of 500 Hz to 10 kHz and requires a rated voltage of 1.3 V. The device exhibits a sensitivity of -53.5 dB ±3 dB at 74 dB SPL with a maximum current rating of 50 uA. Its electrical impedance is specified at 3.5 kΩ, and it utilizes solder pads for termination. The physical dimensions include a length of 7.87 mm and a maximum height of 2.29 mm.

Feature Summary

• Electret condenser transducer technology for analog audio signal capture
• Solder pad termination for direct board integration
• Optimized frequency response for voice band applications

Applications

• Voice recording devices
• Telecommunication handsets
• Consumer audio equipment

Procurement Notes

Verify component status as obsolete before procurement planning. Confirm RoHS compliance and lead-free status through official documentation. Ensure design compatibility with existing solder pad footprints and operating voltage requirements of 1.3 V. Cross-reference sensitivity specifications against system noise floor requirements.

Selection Notes

Select this component only if analog output and specific sensitivity levels match the circuit design. Evaluate the fixed frequency response range against acoustic requirements. Consider the physical height constraint of 2.29 mm for enclosure fitment. Assess availability constraints due to obsolete status when finalizing the bill of materials.

Part Context

This model belongs to the Knowles microphone family, specifically utilizing electret condenser technology. It represents a legacy component in their portfolio, distinguished by its analog output characteristics and specific dimensional profile. The part is categorized under general-purpose microphones rather than specialized industrial or high-fidelity audio variants.

Replacement Considerations

Public confirmed substitute part numbers are not available in the provided documentation. Due to the obsolete status, alternative sourcing strategies or redesigns may be necessary. Consult manufacturer archives for potential last-time buy options or equivalent discontinued series replacements.