SPM0404LE5H-QB Equivalent & Substitute Parts

Part Overview

The SPM0404LE5H-QB is an analog MEMS microphone manufactured by Knowles as part of the SiSonic™ series. This omnidirectional microphone operates across a frequency range of 100 Hz to 10 kHz with a sensitivity of -38dB ±3dB @ 94dB SPL, designed for applications requiring compact analog audio capture with low power consumption. The product is currently obsolete, making identification of suitable substitute components essential for ongoing design support and production continuity.

Substiute Parts

SPM0404LE5H-QB

KnowlesIn Stock: 1059SPM0404LE5H-QB Datasheet

Current PartRFQ

SPU0410LR5H-QB

KnowlesIn Stock: 17502SPU0410LR5H-QB Datasheet

DirectRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution of the SPM0404LE5H-QB is determined by the following critical parameters:

Core Compatibility Criteria:

• Output Type: Analog (required match)
• Direction: Omnidirectional (required match)
• Sensitivity: -38dB ±3dB @ 94dB SPL (required match)
• Voltage Range: 1.5 V ~ 3.6 V (required match)
• Termination: Solder Pads (required match)
• Port Location: Bottom (required match)
• Type: MEMS (Silicon) (required match)

Allowable Variations:

• Frequency Range: Extended upper limit acceptable (100 Hz ~ 80 kHz vs. 100 Hz ~ 10 kHz)
• Impedance: Variation within typical operating margins (300 Ohms to 400 Ohms)
• Current - Supply: Lower consumption acceptable (160 µA vs. 250 µA)
• Physical Dimensions: Smaller footprint acceptable (3.76mm x 3.00mm vs. 4.72mm x 3.76mm; 1.20mm vs. 1.35mm height)

The SPU0410LR5H-QB qualifies as a direct substitute based on matching all core compatibility criteria while offering improved specifications in frequency response, impedance, and power consumption.

Parameter Comparison

Engineering Selection Recommendations

The SPU0410LR5H-QB is the qualified substitute for the obsolete SPM0404LE5H-QB. Selection is supported by the following factors:

Product Status: The SPU0410LR5H-QB maintains active product status with confirmed inventory availability (17,438 Pcs), ensuring long-term supply continuity compared to the obsolete SPM0404LE5H-QB.

Regulatory Compliance: The SPU0410LR5H-QB carries ROHS3 compliance certification, meeting current environmental and regulatory requirements. Both parts maintain REACH Unaffected status and EAR99 export classification.

Functional Equivalence: Core audio specifications remain identical—omnidirectional sensitivity of -38dB ±3dB @ 94dB SPL, analog output, and identical voltage operating range (1.5 V ~ 3.6 V)—ensuring functional compatibility in existing circuit designs.

Performance Improvements: The substitute offers extended frequency response (100 Hz ~ 80 kHz vs. 100 Hz ~ 10 kHz), improved signal-to-noise ratio (63dB vs. 62dB), and reduced power consumption (160 µA vs. 250 µA), providing measurable benefits for power-constrained applications.

Physical Compatibility: The smaller footprint (3.76mm x 3.00mm vs. 4.72mm x 3.76mm) and lower profile (1.20mm vs. 1.35mm) enable space optimization in compact designs while maintaining identical solder pad termination and bottom port location.

Frequently Asked Questions (FAQ)

Q: Can the SPU0410LR5H-QB be used as a direct replacement for the SPM0404LE5H-QB in existing designs?

A: Yes. The SPU0410LR5H-QB qualifies as a direct substitute. Both components share identical sensitivity (-38dB ±3dB @ 94dB SPL), omnidirectional pickup pattern, analog output, voltage range (1.5 V ~ 3.6 V), solder pad termination, and bottom port location. The substitute offers improved specifications without requiring circuit redesign.

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

A: The SPU0410LR5H-QB provides extended frequency response (100 Hz ~ 80 kHz vs. 100 Hz ~ 10 kHz), improved signal-to-noise ratio (63dB vs. 62dB), reduced power consumption (160 µA vs. 250 µA), and a smaller physical footprint (3.76mm x 3.00mm vs. 4.72mm x 3.76mm). Impedance increases from 300 Ohms to 400 Ohms.

Q: Does the impedance difference (300 Ohms vs. 400 Ohms) affect circuit compatibility?

A: The impedance variation falls within acceptable operating margins for analog microphone circuits. Standard audio signal conditioning and amplification stages accommodate this range without modification. Verify impedance matching in your specific signal chain if using precision impedance-dependent circuits.

Q: Is the smaller physical size of the SPU0410LR5H-QB compatible with the original PCB layout?

A: The SPU0410LR5H-QB has a smaller footprint (3.76mm x 3.00mm vs. 4.72mm x 3.76mm) and lower profile (1.20mm vs. 1.35mm). It will fit in the original mounting location with potential for PCB layout optimization. Verify solder pad alignment and clearance in your specific design.

Q: What is the supply status for each component?

A: The SPM0404LE5H-QB is obsolete with limited remaining inventory (951 Pcs). The SPU0410LR5H-QB is an active product with substantial inventory availability (17,438 Pcs), ensuring reliable long-term supply for production and design support.

Q: Are there any regulatory or compliance differences?

A: The SPU0410LR5H-QB carries ROHS3 compliance certification, meeting current environmental standards. Both components maintain REACH Unaffected status and EAR99 export classification. The substitute offers improved regulatory alignment for new designs.

Q: Does the extended frequency range (100 Hz ~ 80 kHz) of the SPU0410LR5H-QB affect performance in applications designed for 100 Hz ~ 10 kHz?

A: No. Extended frequency response is a performance enhancement that does not degrade operation within the original 100 Hz ~ 10 kHz specification. Applications designed for the narrower bandwidth will function identically, with the option to utilize extended range in future design iterations.