BT-23357-095

Overview

The Knowles BT-23357-095 is an analog electret condenser microphone designed for specific frequency applications. It operates within a frequency range of 100 Hz to 300 Hz and features a sensitivity of -60dB ±2.5dB at 74dB SPL. The device requires a supply current of 40 µA and has a rated voltage of 1.3 V. Its impedance is 3.5 kOhms, and it utilizes solder pads for termination. The rectangular package measures 7.87 mm in length with a maximum height of 2.24 mm, featuring a top port location.

Feature Summary

• Electret condenser technology providing analog output signals
• Optimized frequency response between 100 Hz and 300 Hz
• Low power consumption with 40 µA supply current requirement
• Surface mount construction using solder pad termination

Applications

• Ultrasonic detection systems
• Industrial monitoring equipment
• Specialized acoustic sensing devices

Procurement Notes

Verify the exact part number suffix against official manufacturer documentation to ensure correct specifications. Confirm that the required operating voltage and current align with your system design before procurement. Check for RoHS compliance status if environmental regulations apply to your project. Ensure proper handling procedures are followed due to the sensitive nature of electret components during assembly.

Selection Notes

Select this component when a narrow bandpass response centered around low frequencies is required. The fixed 3.5 kOhm impedance must match the input requirements of the subsequent amplifier stage. Consider the physical dimensions and top-port orientation for mechanical integration into the enclosure. Evaluate the -60dB sensitivity level against the expected sound pressure levels in the target environment.

Part Context

This microphone belongs to Knowles' portfolio of specialized acoustic sensors. It is distinct from wideband microphones used in consumer audio by its restricted frequency range. The component is engineered for industrial or technical applications rather than general-purpose voice recording. Its design prioritizes specific frequency isolation over broad spectral fidelity.

Replacement Considerations

No direct public substitute part numbers are confirmed for this specific model. Any replacement must match the 100-300 Hz frequency range, 3.5 kOhm impedance, and 40 µA current draw. Verify pinout compatibility and mechanical footprint before considering alternative manufacturers.