ICS-40180 Equivalent & Substitute Parts

Part Overview

The ICS-40180 is a MEMS analog omnidirectional microphone manufactured by TDK InvenSense, designed for applications requiring 60 Hz to 20 kHz frequency response with -38dB sensitivity at 94dB SPL. The component operates across a 1.5 V to 3.63 V supply range and delivers 65dB signal-to-noise ratio with 350 Ohms impedance. This part is classified as obsolete, making identification of functionally equivalent alternatives essential for ongoing production and design continuity.

Substiute Parts

ICS-40180

TDK InvenSenseIn Stock: 10056ICS-40180 Datasheet

Current PartRFQ

AMM-3738-B-R

PUI Audio, Inc.In Stock: 44509AMM-3738-B-R Datasheet

MFR RecommendedRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution of the ICS-40180 is determined by strict alignment across the following critical parameters:

• Microphone Type: MEMS (Silicon) analog output architecture
• Directional Pattern: Omnidirectional response
• Sensitivity Class: -38dB nominal sensitivity
• Frequency Response: Coverage of audio bandwidth (minimum 20 Hz to 20 kHz)
• Supply Voltage Compatibility: Overlapping voltage operating range
• Termination Method: Solder pad interface
• Physical Form Factor: Rectangular package with bottom port location
• Regulatory Compliance: ROHS3 and EAR99 classification

The AMM-3738-B-R from PUI Audio, Inc. meets these substitution criteria through equivalent MEMS silicon construction, identical omnidirectional pattern, matching -38dB sensitivity specification, and compatible solder pad termination. Voltage range overlap (1.5 V ~ 3.6 V vs. 1.5 V ~ 3.63 V) and bottom port configuration ensure direct functional replacement capability.

Parameter Comparison

Engineering Selection Recommendations

The AMM-3738-B-R qualifies as a direct substitute for the ICS-40180 based on the following engineering criteria:

Compliance & Regulatory Status: Both components maintain ROHS3 compliance and EAR99 classification, ensuring regulatory continuity in applications subject to environmental and export control requirements.

Product Lifecycle: The AMM-3738-B-R carries Active product status, providing assured long-term availability and supply chain stability compared to the obsolete ICS-40180.

Functional Equivalence: Matching MEMS silicon architecture, omnidirectional pattern, and -38dB sensitivity specification establish direct functional parity. The AMM-3738-B-R extends lower frequency response (20 Hz vs. 60 Hz minimum), providing enhanced low-frequency capability without compromising upper bandwidth.

Electrical Compatibility: Overlapping supply voltage ranges (1.5 V ~ 3.6 V) and solder pad termination enable direct PCB integration. The 50 Ohm impedance reduction (300 Ohms vs. 350 Ohms) and 60 µA lower supply current represent favorable electrical characteristics.

Physical Integration: Dimensional variance (0.148" L x 0.116" W vs. 0.138" L x 0.104" W; 0.047" H vs. 0.043" H) requires PCB layout verification to confirm footprint compatibility within existing designs.

Frequently Asked Questions (FAQ)

Q: Can the AMM-3738-B-R replace the ICS-40180 in existing designs without PCB modification?

A: Direct electrical substitution is supported through matching solder pad termination and overlapping voltage ranges. Physical footprint differences (approximately 0.01" length and width increase, 0.004" height increase) require PCB layout assessment to confirm clearance and mounting compatibility.

Q: What is the significance of the frequency range difference (60 Hz vs. 20 Hz lower limit)?

A: The AMM-3738-B-R extends lower frequency response to 20 Hz, capturing additional sub-bass content. Applications requiring the ICS-40180's 60 Hz minimum will operate within the AMM-3738-B-R's specification envelope without performance degradation.

Q: How do impedance differences (350 Ohms vs. 300 Ohms) affect circuit design?

A: The 50 Ohm reduction in the AMM-3738-B-R represents a 14% decrease. Signal conditioning and amplifier input impedance must accommodate this variance. Existing designs with high-impedance input stages will experience negligible impact; designs with impedance-matched networks require re-evaluation.

Q: What does the 3dB S/N ratio difference (65dB vs. 62dB) represent in practical terms?

A: The ICS-40180 provides 3dB superior noise floor performance. Applications with stringent noise requirements should evaluate whether the AMM-3738-B-R's 62dB specification meets system-level signal-to-noise objectives.

Q: Are moisture sensitivity and handling requirements identical?

A: Both components carry MSL 1 (Unlimited) rating, indicating no moisture sensitivity restrictions. Identical handling, storage, and reflow protocols apply.

Q: What packaging format differences exist between these components?

A: The ICS-40180 is supplied in Cut Tape (CT) and Digi-Reel packaging; the AMM-3738-B-R is supplied in Tape & Reel (TR) format. Procurement and assembly processes must accommodate the different tape specifications and reel configurations.