MD9752NSZ-1 Equivalent & Substitute Parts

Part Overview

The MD9752NSZ-1 is an electret condenser microphone manufactured by Knowles, designed for analog noise-cancelling applications. It operates across a frequency range of 100 Hz to 10 kHz with a sensitivity of -40dB ±3dB @ 94dB SPL and supports voltage inputs from 3 V to 10 V. The component features solder pad termination and a circular form factor with 0.382" diameter.

This part is classified as obsolete. Identifying equivalent substitute components is necessary to maintain design continuity and ensure component availability for production and maintenance applications.

Substiute Parts

MD9752NSZ-1

KnowlesIn Stock: 1139MD9752NSZ-1 Datasheet

Current PartRFQ

CMP-5247TF-K

CUI DevicesIn Stock: 950CMP-5247TF-K Datasheet

MFR RecommendedRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution eligibility for the MD9752NSZ-1 is determined by the following critical parameters:

• Microphone type: Electret condenser
• Output configuration: Analog
• Directional characteristic: Noise cancelling
• Frequency range: Minimum 100 Hz lower bound; upper frequency must accommodate 10 kHz operation
• Sensitivity range: Within ±3dB tolerance specification
• Impedance: 2.2 kOhms
• Voltage compatibility: Overlap with 3 V ~ 10 V range
• Supply current: 500 µA
• Termination method: Solder pads
• Physical form factor: Circular, 0.382" diameter
• Height constraint: Maximum 0.205" (5.20mm)

The CMP-5247TF-K from CUI Devices meets these substitution criteria. It maintains the core electret condenser architecture with analog noise-cancelling output, operates within compatible voltage and current specifications, and shares identical mechanical dimensions and termination method.

Parameter Comparison

Engineering Selection Recommendations

The CMP-5247TF-K is the designated manufacturer-recommended substitute for the MD9752NSZ-1. Selection of this alternative component is supported by the following factors:

The substitute maintains active product status, ensuring ongoing availability and supply chain continuity. The CMP-5247TF-K is ROHS3 compliant and carries REACH Unaffected certification, meeting current regulatory requirements. Both components share identical mechanical dimensions, impedance, and termination specifications, enabling direct form-fit-function replacement in existing PCB layouts.

The CMP-5247TF-K extends the upper frequency response to 20 kHz and provides improved signal-to-noise ratio (58dB versus 55dB). The lower minimum voltage requirement (1.5 V versus 3 V) expands operational flexibility. Height tolerance increases by 0.008" (0.20mm), which remains within typical PCB assembly constraints for circular microphone packages.

Frequently Asked Questions (FAQ)

Q: Can the CMP-5247TF-K directly replace the MD9752NSZ-1 in existing designs?

A: Yes. Both components share identical diameter (0.382"), solder pad termination, impedance (2.2 kOhms), and supply current (500 µA). The height difference of 0.008" (0.20mm) is within standard PCB assembly tolerances for this package category. Voltage range compatibility is maintained across the 3 V to 10 V operating window.

Q: What are the key differences between these two microphones?

A: The CMP-5247TF-K provides extended frequency response (100 Hz ~ 20 kHz versus 100 Hz ~ 10 kHz), improved noise floor (58dB S/N ratio versus 55dB), and lower minimum voltage requirement (1.5 V versus 3 V). Sensitivity differs by 7dB (-47dB versus -40dB @ 94dB SPL).

Q: Are there compliance or certification differences?

A: The MD9752NSZ-1 is obsolete with no active compliance documentation. The CMP-5247TF-K is an active product with ROHS3 compliance and REACH Unaffected status, meeting current regulatory standards.

Q: Does the sensitivity difference affect circuit design?

A: Sensitivity values are provided at identical measurement conditions (94dB SPL). The 7dB difference reflects component-level performance variation. Circuit gain adjustment may be required to achieve equivalent output levels in the application.

Q: What is the moisture sensitivity level for the substitute?

A: The CMP-5247TF-K carries MSL 1 (Unlimited), indicating no moisture sensitivity constraints during storage or handling.