TO38-30886-B21

Overview

The Knowles TO38-30886-B21 is a subminiature electret condenser microphone engineered for high-performance audio capture in space-constrained and rugged environments. This omnidirectional analog microphone features an impedance of 8 kOhms, a current rating of 29 uA, and a sensitivity of -54 dBA. Designed as a compact solution, it integrates directly into systems requiring reliable sound detection without the need for external biasing circuits beyond standard operation.

Feature Summary

• Omnidirectional directional properties ensure consistent audio pickup from all angles
• Subminiature form factor designed for integration into space-constrained applications
• Electret condenser technology provides stable analog audio output

Applications

• Portable electronic devices with limited internal volume
• Rugged environmental audio monitoring systems
• Compact consumer electronics requiring high-fidelity sound capture

Procurement Notes

Verify the specific revision suffix B21 against the manufacturer's latest datasheet to confirm pinout compatibility and material composition. Ensure that the procurement source provides original manufacturer documentation rather than third-party summaries. Cross-reference the part number with official Knowles catalogs to validate current production status and RoHS compliance details before finalizing acquisition plans.

Selection Notes

Select this component when omnidirectional coverage is required within a subminiature footprint. The fixed 8 kOhm impedance and 29 uA current rating dictate specific preamplifier interface requirements. Evaluate the -54 dBA sensitivity against ambient noise levels in the target application to ensure adequate signal-to-noise ratio without excessive gain amplification.

Part Context

This model belongs to the Knowles TO38 series of subminiature microphones. It represents a specialized variant optimized for durability and compactness compared to larger standard microphones. The series is widely recognized for its reliability in harsh conditions, making it suitable for industrial and medical instrumentation where size and robustness are critical constraints.

Replacement Considerations

Direct substitutes must match the TO38 package outline and electrical characteristics. Verify equivalent impedance and sensitivity values if cross-referencing with other manufacturers' omnidirectional electret microphones. Ensure any alternative maintains the same analog output configuration and physical mounting dimensions.