MD9745APA-1

Microphones Overview

The Knowles MD9745APA-1 is an omnidirectional electret condenser microphone designed for analog audio signal capture. It operates at a supply voltage of 2 V and features a sensitivity of -41 dB ±3 dB relative to 1 V/Pa at 94 dB SPL. The device exhibits a signal-to-noise ratio of 55 dB and an impedance of 2.2 kOhms. Physically, it measures 0.382 inches (9.7 mm) in diameter with a depth of 4.5 mm. This component is currently obsolete and no longer manufactured by the producer.

Microphones Feature Summary

• Omnidirectional acoustic pattern for uniform sound pickup from all directions
• Electret condenser transducer technology for analog output
• Low operating supply voltage requirement of 2 V

Microphones Applications

• Consumer electronic devices requiring compact audio input
• Portable recording equipment
• Voice recognition systems

Microphones Procurement Notes

This component is officially marked as obsolete and no longer manufactured by Knowles. Procurement must focus on identifying verified substitute parts or available surplus stock from authorized distributors. Direct ordering from the manufacturer is not possible. Verify compatibility with existing circuit designs when selecting alternatives.

Microphones Selection Notes

Designers should consider the low supply voltage and analog output characteristics when integrating this microphone. The omnidirectional nature suits applications where sound source directionality is not critical. Due to its obsolete status, replacement strategies should prioritize components with matching electrical specifications and physical dimensions to ensure seamless integration into legacy systems.

Microphones Part Context

The MD9745APA-1 belongs to the MD series of microphones produced by Knowles Electronics. This series typically includes various electret condenser microphones tailored for different form factors and performance requirements within the consumer electronics market. The specific APA-1 suffix denotes particular packaging and terminal configurations within this product line.

Microphones Replacement Considerations

PUI Audio AOM-4544P-2-R is listed as a similar available substitute. Engineers must verify that the alternative matches the original's sensitivity, impedance, and supply voltage requirements to maintain system performance.