TO38-31020-B21

Overview

The Knowles TO38-31020-B21 is an analog electret condenser microphone designed for compact audio applications. It features an omnidirectional polar pattern with a sensitivity of -54 dBA ±3dB at 74dB SPL. The device operates within a supply voltage range of 0.9 V to 1.6 V and exhibits a directional impedance of 4.4 kOhms. Key electrical specifications include a current rating of 29 uA and a frequency response spanning from 80 Hz to 10 kHz. The component dimensions are approximately 3.58 mm in width and 1.35 mm in depth, facilitating integration into space-constrained electronic designs.

Feature Summary

• Omnidirectional acoustic pickup pattern ensures consistent sound capture from all directions
• Low voltage operation supports battery-powered and portable electronic devices
• Compact physical footprint enables integration into miniaturized product designs

Applications

• Voice pickup in noisy environments
• Mobile device audio input
• Compact consumer electronics

Procurement Notes

Verify the specific ordering suffix against the manufacturer's official documentation to ensure correct functional parameters. Confirm that the received components match the specified sensitivity and voltage ratings. Check for any updates to the datasheet regarding pin configurations or environmental compliance standards before finalizing procurement orders.

Selection Notes

Select this component when low-voltage operation and omnidirectional coverage are required. Ensure the application environment stays within the specified 0.9 V to 1.6 V supply range. Consider the -54 dBA sensitivity level relative to expected sound pressure levels. Verify mechanical fitment against the 3.58 mm width constraint during the design phase.

Part Context

This part belongs to the Knowles electret condenser microphone family, which focuses on high-quality audio transduction in small form factors. The TO38 series is engineered for reliability in consumer electronics. This specific model variant provides standardized analog output suitable for direct interfacing with common audio processing circuits found in modern portable devices.

Replacement Considerations

Consult official substitution lists for compatible alternatives. Cross-reference pinouts and sensitivity tolerances if considering similar models from the same manufacturer.