BT-21754-000

$12.28

Description：MICROPHONE COND ANALOG -59.5DB
Series：BT
Mfr：Knowles
Package：Bulk

SKU:d9b6a37862e1 Category: Microphones Brand: Knowles

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Product introduction

Product Detailed Parameters

Description：MICROPHONE COND ANALOG -59.5DB
Series：BT
Mfr：Knowles
Package：Bulk
Type：Electret Condenser
Output Type：Analog
Direction：-
Frequency Range：100 Hz ~ 4.2 kHz
Sensitivity：-59.5dB ±3dB @ 74dB SPL
S/N Ratio：-
Impedance：3.5 kOhms
Voltage Range：0.9 V ~ 10 V
Current - Supply：40 µA
Port Location：Side
Ratings：-
Termination：Solder Pads
Size / Dimension：0.310" L x 0.218" W (7.87mm x 5.54mm)
Height (Max)：0.090" (2.29mm)
Shape：Rectangular
Grade：-
Qualification：-
Voltage - Rated：1.3 V

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BT-21754-000

Overview

The Knowles BT-21754-000 is an analog electret condenser microphone designed for surface-mount applications. It features a rectangular shape with solder pad termination and an omnidirectional polar pattern with end port configuration. The device operates within a voltage range of 0.9 V to 10 V. Its sensitivity is specified as -59.5 dB ±3 dB relative to 1 V/Pa at 74 dB SPL. The operational frequency response spans from 100 Hz to 4.2 kHz, providing suitable acoustic performance for general audio capture tasks.

Feature Summary

Surface-mount construction utilizing solder pads for direct PCB integration
Omnidirectional acoustic response via end port design
Analog output signal generation using electret condenser technology

Applications

General purpose audio recording devices
Voice recognition systems
Consumer electronic audio input modules

Procurement Notes

Verify the specific part number suffix against official manufacturer documentation to ensure correct electrical characteristics and mechanical dimensions. Confirm RoHS compliance status through current datasheets. Validate supplier authorization to guarantee component authenticity and traceability during acquisition.

Selection Notes

Evaluate the required operating voltage range against system power supplies, noting the 0.9 V minimum threshold. Assess whether the 100 Hz to 4.2 kHz frequency response aligns with target audio bandwidth requirements. Consider the SMD form factor and solder pad layout for compatibility with existing board designs and assembly processes.

Part Context

This component belongs to the Knowles microphones category, specifically within the electret condenser segment. It represents a standard solution for compact audio sensing needs in modern electronics. The product line emphasizes reliable analog signal conversion for voice and ambient sound detection in space-constrained environments.

Replacement Considerations

Consult official substitution guides for compatible alternatives. Verify pinout compatibility and electrical parameter alignment before integrating any substitute components into the design.

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.