BT-21751-005

$10.89

Description：MIC OMNI .9-10V -40DB SENS
Series：BT
Mfr：Knowles
Package：Bulk

SKU:09feb27d5947 Category: Microphones Brand: Knowles

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Product introduction

Product Detailed Parameters

Description：MIC OMNI .9-10V -40DB SENS
Series：BT
Mfr：Knowles
Package：Bulk
Type：Electret Condenser
Output Type：Analog
Direction：Omnidirectional
Frequency Range：100 Hz ~ 4.2 kHz
Sensitivity：-60dB ±1dB @ 94dB SPL
S/N Ratio：-
Impedance：3.5 kOhms
Voltage Range：-
Current - Supply：40 µA
Port Location：Top
Ratings：-
Termination：Solder Pads
Size / Dimension：0.373" L x 0.218" W (9.47mm x 5.54mm)
Height (Max)：0.090" (2.28mm)
Shape：Rectangular
Grade：-
Qualification：-
Voltage - Rated：1.3 V

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BT-21751-005

Overview

The Knowles BT-21751-005 is an omnidirectional electret condenser microphone designed for analog audio signal capture. It operates within a frequency range of 100 Hz to 4.2 kHz and features a sensitivity of -60dB ±1dB at 94dB SPL. The device has an impedance of 3.5 kOhms and requires a supply voltage between 0.9V and 10V. It utilizes solder pad mounting and complies with RoHS standards.

Feature Summary

Omnidirectional acoustic pickup pattern for uniform sound reception
Electret condenser transducer technology for analog output
Wide operating voltage range supporting low-power applications

Applications

Consumer electronic audio input devices
Portable communication equipment
General-purpose analog microphone modules

Procurement Notes

Verify the component status as obsolete in official manufacturer records before procurement planning. Confirm that the specified solder pad interface matches the target PCB layout requirements. Ensure the operating voltage range aligns with the system power supply design to prevent damage or performance degradation during operation.

Selection Notes

Select this component when an omnidirectional response is required within the 100 Hz to 4.2 kHz bandwidth. The fixed impedance of 3.5 kOhms must be compatible with the input stage of the connected amplifier circuit. Consider the physical dimensions and solder pad configuration for mechanical integration into the final assembly.

Part Context

This model belongs to the Knowles microphone product line, specifically utilizing electret condenser technology. It is categorized under analog microphones intended for general audio sensing applications. The part represents a standard solution for basic voice and sound capture needs in consumer electronics.

Replacement Considerations

Public confirmed substitute part numbers are not available in the provided documentation. Due to the obsolete status indicated in some sources, direct cross-referencing should be performed using current manufacturer catalogs for equivalent specifications.

How to buy

Online and offline orders are supported. If the item is available for online purchase, you can place it in the cart; for wholesale pricing, please contact our product manager for a quote.

Payment Method

Payment methods: T/T, WeChat Pay, credit cards, Google Pay, Apple Pay . Buyer covers shipping, fees, duties, and taxes; contact our product manager if you need a contract/procurement process.

Delivery time

In-stock items usually ship within 24 hours. Otherwise, shipment is arranged 1 to 2 days after the items arrive at our warehouse. Timing depends on destination and shipping method.

Freight calculation

Freight cost depends on destination, package size, and weight . We offer shipping options via DHL, FedEx, UPS, and TNT , and can ship using your freight account upon request.

Mode of Transportation

We ship via DHL, FedEx, UPS, and TNT. If you prefer a specific logistics provider, we can ship using your designated carrier.

Return and Refund

Returns are accepted within 60 days of invoice with RMA approval. Items must be resalable; original invoice and test report are required. No returns for customer errors.