CMEJ-4618-42-L120

Overview

The Same Sky CMEJ-4618-42-L120 is an omnidirectional electret condenser microphone designed for audio signal capture. It features a cylindrical metal housing with dimensions of 4.6 mm in diameter and 1.8 mm in depth. The device operates at a supply voltage of 2 VDC with a maximum current consumption of 500 uA. It exhibits a nominal sensitivity of -42 dB (±3 dB) referenced to 1 V/Pa at 94 dB SPL, measured within a frequency range of 100 Hz to 10 kHz. The acoustic impedance is specified at 2.2 kOhms. Termination is achieved via 120 mm wire leads, facilitating integration into compact electronic assemblies requiring low-power audio input.

Feature Summary

• Omnidirectional polar pattern ensures uniform sound pickup from all directions
• Low power consumption suitable for battery-operated portable devices
• Compact cylindrical form factor minimizes spatial footprint on circuit boards
• Pre-terminated wire leads simplify assembly and reduce manufacturing complexity

Applications

• Consumer electronics audio input modules
• Portable recording devices
• Voice recognition systems
• Intercom and communication equipment

Procurement Notes

Verify the specific suffix designation against official manufacturer documentation to confirm lead length and termination type. Ensure compatibility with existing biasing circuits regarding the 2 VDC operating voltage and 500 uA current requirement. Confirm RoHS compliance status through the latest datasheet revision. Validate that the 120 mm wire length meets mechanical clearance constraints within the target enclosure design before finalizing procurement orders.

Selection Notes

Select this component when an omnidirectional response is required for general-purpose voice capture. The fixed 120 mm wire length distinguishes it from other variants in the series with different lead lengths or PCB mount options. Consider the -42 dB sensitivity level relative to application noise floors. Verify that the 2.2 kOhm output impedance matches the input requirements of the connected amplifier or ADC stage to ensure optimal signal transfer without excessive loading effects.

Part Context

This model belongs to the Same Sky CMEJ series of electret condenser microphones. The series offers various configurations including different diameters, sensitivities, and termination methods such as solder pins or wire leads. The CMEJ-4618-42-L120 specifically utilizes the 4.6 mm diameter housing variant with extended wire leads, providing flexibility for applications where direct PCB mounting is not feasible or where strain relief is managed via the wires rather than the board.

Replacement Considerations

Direct substitutes include other CMEJ-4618-42-Lx variants with identical electrical characteristics but different wire lengths, such as CMEJ-4618-42-L010. Cross-referencing with other manufacturers requires matching the 4.6 mm diameter, 2 VDC bias, -42 dB sensitivity, and 2.2 kOhm impedance specifications precisely.