CMC-9745-37T2

Overview

The CMC-9745-37T2 is an analog electret condenser microphone manufactured by Same Sky. It features a unidirectional polar pattern with a sensitivity of -37dB ±3dB at 94dB SPL. The device operates within a voltage range of 1.5 V to 9 V and draws a supply current of 400 µA. Its frequency response spans from 100 Hz to 12 kHz, and it exhibits a signal-to-noise ratio of 69 dB. The microphone has a nominal impedance of 2.2 kOhms and utilizes solder pad termination. Physically, it measures 9.70 mm in diameter and 4.50 mm in height.

Feature Summary

• Unidirectional acoustic design for focused sound capture
• IP67 rated housing providing dust and water resistance
• Compact circular form factor suitable for space-constrained PCBs
• Analog output via top-mounted solder pads

Applications

• Waterproof audio recording devices
• Industrial voice recognition systems
• Outdoor environmental monitoring equipment
• Medical diagnostic audio instruments

Procurement Notes

Verify the specific suffix '37T2' against the manufacturer's latest datasheet to confirm sensitivity and voltage specifications. Ensure the ordering documentation explicitly references the IP67 rating if environmental sealing is required for the application. Cross-reference the RoHS compliance status with current regulatory requirements before finalizing procurement orders.

Selection Notes

Select this component when a unidirectional response is necessary to isolate sound sources from ambient noise. The IP67 rating makes it suitable for harsh environments where moisture or dust ingress is a concern. Compare the 1.5 V to 9 V operating range against system power constraints to ensure compatibility with the intended bias voltage supply.

Part Context

This part belongs to the CMC series of compact electret condenser microphones. The series offers various sensitivity options and directional patterns. The CMC-9745-37T2 specifically provides a balance of high sensitivity and environmental protection, distinguishing it from standard indoor microphones through its sealed construction and robust mechanical design.

Replacement Considerations

Direct substitutes include the CMC-9745-37T, which shares similar physical dimensions but may differ in sensitivity or packaging details. Verify pinout compatibility and electrical parameters before swapping components to ensure circuit functionality remains unchanged.