CMEJ-4618-42-L177

Overview

The CMEJ-4618-42-L177 is an electret condenser microphone manufactured by Same Sky. It features an omnidirectional polar pattern and operates at a supply voltage of 2.0 Vdc. The device has a sensitivity of -42 dB ±3 dB referenced to 94 dB SPL at 1 kHz. Its impedance is 2.2 kOhms with a current rating of 500 uA. The physical dimensions are 4.6 mm in diameter and 1.8 mm in depth. Termination is provided via wire leads, specifically 177 mm in length.

Feature Summary

• Omnidirectional acoustic response for uniform sound capture from all directions
• Electret condenser technology for reliable analog audio signal generation
• Low power consumption suitable for battery-operated portable devices

Applications

• Voice recognition systems requiring consistent directional pickup
• Portable consumer electronics such as digital recorders
• Industrial communication equipment needing robust audio input

Procurement Notes

Verify the specific wire length suffix (L177) matches the design requirement before ordering. Confirm that the 2.0 Vdc operating voltage aligns with the target circuit's power supply rails. Ensure the PCB or housing accommodates the 4.6 mm diameter and 1.8 mm depth constraints. Check termination compatibility with the 177 mm wire leads for proper strain relief and routing.

Selection Notes

Select this component when an omnidirectional response is preferred over directional alternatives. The fixed 2.2 kOhm impedance requires matching with appropriate pre-amplifier inputs. Consider the 177 mm wire lead length for integration into enclosures where direct PCB mounting is not feasible. Evaluate the -42 dB sensitivity against ambient noise levels in the intended application environment.

Part Context

This microphone belongs to the CMEJ series of electret condenser microphones from Same Sky. The series offers various termination options and wire lengths to suit different assembly needs. It is designed for general-purpose audio applications where compact size and low cost are primary factors. The L177 variant specifically denotes the 177 mm wire lead configuration.

Replacement Considerations

Direct substitutes may include other omnidirectional electret microphones with similar 2.0 Vdc operation and -42 dB sensitivity. Verify mechanical footprint compatibility, specifically the 4.6 mm diameter and 1.8 mm depth. Ensure electrical parameters like impedance and current rating match the existing circuit design to avoid performance degradation.