INMP404ACEZ-R7 Equivalent & Substitute Parts

Part Overview

The INMP404ACEZ-R7 is a MEMS analog omnidirectional microphone manufactured by TDK InvenSense, designed for applications requiring 100 Hz to 15 kHz frequency response with -38dB sensitivity at 94dB SPL. The device operates across 1.5V to 3.3V supply range with 250µA current consumption and features bottom-mounted solder pad termination in a 3.35mm × 2.50mm rectangular package.

This part is classified as obsolete. Identifying equivalent substitute components is necessary to maintain design continuity and ensure component availability for new production runs and ongoing system support.

Substiute Parts

INMP404ACEZ-R7

TDK InvenSenseIn Stock: 892INMP404ACEZ-R7 Datasheet

Current PartRFQ

SPU0410LR5H-QB

KnowlesIn Stock: 17502SPU0410LR5H-QB Datasheet

MFR RecommendedRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution of the INMP404ACEZ-R7 is determined by the following critical parameters:

Functional Equivalence Criteria:

• MEMS silicon construction with analog output
• Omnidirectional pickup pattern
• Sensitivity matching at -38dB ±3dB @ 94dB SPL
• Bottom-mounted solder pad termination

Electrical Compatibility Criteria:

• Voltage range must encompass or overlap the original 1.5V to 3.3V specification
• Output impedance and signal characteristics must be compatible with existing signal conditioning circuits
• Current consumption should not exceed design power budgets

Mechanical Compatibility Criteria:

• Rectangular package footprint suitable for PCB integration
• Physical dimensions and height must accommodate existing PCB layout constraints
• Solder pad configuration must match board design

The SPU0410LR5H-QB from Knowles meets these substitution criteria while offering extended frequency response and improved component availability.

Parameter Comparison

Engineering Selection Recommendations

Product Status Consideration: The INMP404ACEZ-R7 is obsolete, making the SPU0410LR5H-QB the appropriate substitute for ongoing production and support. The SPU0410LR5H-QB maintains active product status with established supply chain availability.

Compliance Alignment: Both components are ROHS3 compliant and REACH unaffected, meeting regulatory requirements for current manufacturing standards. The SPU0410LR5H-QB provides superior moisture sensitivity level (MSL 1 vs. MSL 5), reducing handling and storage constraints during manufacturing.

Critical Design Verification Points:

• Impedance difference (200Ω vs. 400Ω) requires validation of signal conditioning circuits and analog front-end performance
• Physical dimension increase (3.35mm × 2.50mm to 3.76mm × 3.00mm) and height increase (0.98mm to 1.20mm) necessitate PCB layout review for component placement and clearance
• Extended frequency response (15 kHz to 80 kHz) is compatible with applications designed for the original 15 kHz upper limit

Frequently Asked Questions (FAQ)

Q: Can the SPU0410LR5H-QB directly replace the INMP404ACEZ-R7 without circuit modifications?

A: Direct replacement requires verification of impedance compatibility. The SPU0410LR5H-QB has 400Ω impedance versus the original 200Ω. Signal conditioning circuits and analog front-end designs must be evaluated to confirm acceptable performance with the higher impedance source.

Q: What are the physical constraints for using the SPU0410LR5H-QB as a substitute?

A: The SPU0410LR5H-QB footprint is 3.76mm × 3.00mm with 1.20mm maximum height, compared to the original 3.35mm × 2.50mm × 0.98mm. PCB layout must accommodate the larger footprint and verify vertical clearance for the increased height.

Q: Does the extended frequency response of the SPU0410LR5H-QB affect compatibility?

A: The SPU0410LR5H-QB extends frequency response to 80 kHz, exceeding the original 15 kHz specification. This extended capability is backward compatible with applications designed for the narrower bandwidth. No performance degradation occurs in the original 100 Hz to 15 kHz operating range.

Q: What is the impact of the SPU0410LR5H-QB's lower current consumption?

A: The SPU0410LR5H-QB consumes 160µA versus the original 250µA, reducing power supply requirements by 90µA. This improvement benefits battery-powered and low-power applications without requiring circuit redesign.

Q: How do the moisture sensitivity levels differ between these components?

A: The INMP404ACEZ-R7 has MSL 5 (48-hour limit), while the SPU0410LR5H-QB has MSL 1 (unlimited). The SPU0410LR5H-QB requires less stringent moisture control during storage, handling, and manufacturing, reducing production constraints.

Q: Are there any compliance or certification differences?

A: Both components are ROHS3 compliant and REACH unaffected. No compliance barriers exist for substitution in regulated applications.