PMM-3738-WP-R Equivalent & Substitute Parts

Part Overview

The PMM-3738-WP-R is a Piezo MEMS analog microphone manufactured by PUI Audio, Inc., designed for omnidirectional audio capture across the 100 Hz to 10 kHz frequency range. This component operates within a 1.6 V to 3.6 V supply range and delivers -37dB sensitivity with IP68 waterproof and dust-tight ratings, making it suitable for sealed or moisture-exposed applications.

The PMM-3738-WP-R is classified as obsolete. Identifying equivalent substitute parts is necessary to maintain design continuity, ensure supply chain availability, and support ongoing production or maintenance requirements for systems incorporating this microphone.

Substiute Parts

PMM-3738-WP-R

PUI Audio, Inc.In Stock: 779PMM-3738-WP-R Datasheet

Current PartRFQ

SPM04C-38/1186

BeStar Technologies, Inc.In Stock: 7350SPM04C-38/1186 Datasheet

SimilarRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution eligibility for the PMM-3738-WP-R is determined by the following critical parameters:

• Microphone Type: Piezo MEMS technology
• Output Configuration: Analog output
• Directional Pattern: Omnidirectional
• Voltage Compatibility: 1.6 V ~ 3.6 V operating range
• Environmental Rating: IP68 waterproof and dust-tight protection
• Termination Method: Solder pads
• Frequency Response: Coverage of audio spectrum from low to high frequencies
• Physical Form Factor: Rectangular shape with comparable dimensions

The SPM04C-38/1186 meets these core substitution criteria as a Piezo MEMS analog omnidirectional microphone with identical voltage range, IP68 rating, solder pad termination, and compatible physical dimensions. Variations in sensitivity, frequency range boundaries, and supply current are within acceptable engineering tolerances for this component category.

Parameter Comparison

Engineering Selection Recommendations

The SPM04C-38/1186 is an active production substitute for the obsolete PMM-3738-WP-R. Both components share identical voltage operating ranges, IP68 environmental protection, solder pad termination, and comparable physical dimensions suitable for direct PCB layout substitution.

Key considerations for selection:

Frequency Response Shift: The SPM04C-38/1186 lower frequency limit begins at 250 Hz versus 100 Hz for the PMM-3738-WP-R. Applications requiring sub-250 Hz response must evaluate whether this limitation affects system performance.

Supply Current: The SPM04C-38/1186 specifies 150 mA supply current compared to 150 µA for the original part. This represents a significant increase in power consumption that must be accommodated in power budget calculations.

Port Location: The SPM04C-38/1186 features top-mounted port access versus bottom-mounted on the PMM-3738-WP-R. PCB layout and acoustic chamber design must be adjusted accordingly.

Compliance Status: The SPM04C-38/1186 carries active RoHS3 compliance certification, supporting modern regulatory requirements. Both parts maintain EAR99 export classification and identical HTSUS coding.

Supply Availability: The SPM04C-38/1186 maintains active production status with substantial inventory availability, ensuring long-term supply chain continuity.

Frequently Asked Questions (FAQ)

Q: Can the SPM04C-38/1186 directly replace the PMM-3738-WP-R without PCB modifications?

A: Physical dimensions are compatible within 0.004" tolerance on length and width, and 0.004" on height. However, port location differs (top versus bottom), requiring acoustic chamber redesign. Solder pad termination is identical, but PCB layout must accommodate the new port orientation.

Q: What is the impact of the 250 Hz lower frequency limit on the SPM04C-38/1186?

A: Applications requiring response below 250 Hz will experience signal attenuation in that frequency band. System frequency response curves must be re-evaluated if sub-250 Hz audio capture is critical to application function.

Q: How does the 150 mA supply current of the SPM04C-38/1186 compare to the original 150 µA specification?

A: The SPM04C-38/1186 draws 1000 times more current than the PMM-3738-WP-R. Power supply capacity and thermal management must be reassessed. This difference may impact battery life in portable applications or require power supply upgrades in fixed installations.

Q: Are both parts suitable for sealed or moisture-exposed environments?

A: Yes. Both the PMM-3738-WP-R and SPM04C-38/1186 carry IP68 ratings for dust-tight and waterproof protection, with MSL 1 (unlimited) moisture sensitivity levels, making them suitable for sealed enclosures and wet environments.

Q: What are the sensitivity differences between these microphones?

A: The PMM-3738-WP-R provides -37dB ±3dB sensitivity at 94dB SPL, while the SPM04C-38/1186 delivers -38dB ±3dB sensitivity. The 1dB difference falls within typical measurement tolerance and represents negligible practical variation in audio capture performance.

Q: Is the SPM04C-38/1186 compliant with current regulatory standards?

A: Yes. The SPM04C-38/1186 is RoHS3 compliant and maintains EAR99 export classification. Both parts share identical HTSUS coding (8542.39.0001), supporting modern procurement and compliance requirements.