ICS-40181 Equivalent & Substitute Parts

Part Overview

The ICS-40181 is a MEMS analog omnidirectional microphone manufactured by TDK InvenSense, designed for applications requiring 60 Hz to 20 kHz frequency response with -38 dB sensitivity. The device operates across a 1.5 V to 3.63 V supply range and delivers a 65 dB signal-to-noise ratio. This part is currently obsolete, making identification of compatible substitute components essential for ongoing production and design requirements.

Substiute Parts

ICS-40181

TDK InvenSenseIn Stock: 991ICS-40181 Datasheet

Current PartRFQ

AMM-3742-T-R

PUI Audio, Inc.In Stock: 1061AMM-3742-T-R Datasheet

MFR RecommendedRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution of the ICS-40181 is determined by the following critical parameters:

• Microphone Type: MEMS (Silicon) analog output technology
• Directional Pattern: Omnidirectional pickup
• Frequency Response: Coverage of the 60 Hz to 20 kHz audio band
• Sensitivity Range: Microphones with -38 dB to -42 dB sensitivity maintain functional compatibility
• Voltage Compatibility: Supply voltage range overlap (1.5 V minimum required)
• Termination Method: Solder pad connection
• Physical Form Factor: Rectangular package with comparable dimensions
• Compliance: ROHS3 compliance maintained

The AMM-3742-T-R from PUI Audio, Inc. qualifies as a substitute based on matching these core parameters while maintaining active product status and current availability.

Parameter Comparison

Engineering Selection Recommendations

The AMM-3742-T-R is the designated substitute for the obsolete ICS-40181. Selection is supported by the following factors:

• Compliance Alignment: Both parts maintain ROHS3 compliance, ensuring regulatory consistency in manufacturing and deployment
• Active Product Status: The AMM-3742-T-R is actively manufactured and stocked, providing supply chain continuity
• Core Functional Equivalence: Matching MEMS silicon technology, analog output, omnidirectional pattern, and solder pad termination ensure direct functional replacement capability
• Voltage Supply Compatibility: Overlapping voltage ranges (1.5 V minimum) support existing power supply designs
• Frequency Response Coverage: The extended lower frequency response (50 Hz vs. 60 Hz) of the substitute provides additional bandwidth margin

Parameter variations in sensitivity (-42 dB vs. -38 dB), impedance (300 Ohms vs. 350 Ohms), and signal-to-noise ratio (58 dB vs. 65 dB) require circuit-level evaluation to confirm suitability for specific application requirements.

Frequently Asked Questions (FAQ)

Q: Can the AMM-3742-T-R directly replace the ICS-40181 without circuit modifications?

A: The AMM-3742-T-R shares the same MEMS technology, analog output, omnidirectional pattern, and solder pad termination as the ICS-40181. However, differences in sensitivity (-42 dB vs. -38 dB), impedance (300 Ohms vs. 350 Ohms), and signal-to-noise ratio (58 dB vs. 65 dB) may require gain adjustment or signal conditioning circuit evaluation depending on application specifications.

Q: What are the physical compatibility considerations?

A: The AMM-3742-T-R is slightly larger (0.148" L x 0.116" W vs. 0.138" L x 0.104" W) and taller (0.047" vs. 0.043" maximum height). PCB layout and mechanical clearance must be verified before implementation.

Q: Are both parts compliant with the same regulatory standards?

A: Yes. Both the ICS-40181 and AMM-3742-T-R are ROHS3 compliant and carry the same ECCN (EAR99) and HTSUS (8518.10.8030) classifications.

Q: What is the packaging difference between these parts?

A: The ICS-40181 is supplied in Cut Tape (CT) and Digi-Reel packaging. The AMM-3742-T-R is supplied in Tape & Reel (TR) format. Procurement and assembly processes may require adjustment to accommodate the different packaging configuration.

Q: Why is the ICS-40181 marked as obsolete?

A: The ICS-40181 is no longer in active production. The AMM-3742-T-R represents the current active alternative for equivalent MEMS analog omnidirectional microphone applications.