MSM-261S4031H
Top-port digital PDM MEMS microphone with -26dBV sensitivity, 65dB SNR, and AEC-Q100 qualification for automotive and consumer applications.
Product Overview
Description
The MSM-261S4031H is a high-performance top-port digital MEMS microphone featuring PDM output and enhanced SNR for demanding audio applications. The top-port configuration offers flexible mounting options for various product designs.
With -26dBV sensitivity and 65dB SNR, this microphone delivers superior audio capture compared to standard models. The AEC-Q100 qualification ensures reliability for automotive and industrial applications.
The top-port design simplifies acoustic integration in products where bottom mounting is not practical. The compact 3.76mm x 2.95mm x 1.1mm package maintains compatibility with standard MEMS microphone footprints.
Product Series
MSM
Primary Application
Automotive voice recognition systems
Key Features
- Top-port configuration for flexible mounting
- 65dB SNR for superior audio quality
- Digital PDM output for noise-immune interface
- AEC-Q100 qualified for automotive applications
- -26dBV sensitivity for excellent voice capture
- Compact surface-mount package
Specifications
| Sensitivity | -26dBV |
|---|---|
| SNR | 65dB |
| Frequency Response | 100Hz - 10kHz |
| Current Consumption | 700uA |
| Package | 3.76 x 2.95 x 1.1mm |
| Output Type | Digital PDM |
| Operating Temperature | -40°C to +85°C |
| Qualification | AEC-Q100 Grade 3 |
Applications
Automotive voice recognition systems
Automotive and EV electronics
Smart speakers and voice assistants
Electronic system design
Smartphones and tablets
Electronic system design
Wearable devices
Electronic system design
Smart home devices
Electronic system design
Professional audio equipment
Electronic system design
FAE Expert Insights
"The MSM-261S4031H is my recommendation when customers need a top-port digital microphone with enhanced performance. The 65dB SNR is noticeably better than the 64dB of the standard model, particularly beneficial for far-field voice recognition applications. The top-port design is essential for products where the microphone must face upward or where PCB layout constraints prevent bottom-port mounting. I've successfully used this microphone in smart speaker designs where the microphone array faces the ceiling. The acoustic performance is excellent - the extra 1dB of SNR really makes a difference in noisy environments. The PDM interface works seamlessly with all major audio processors. For dual-microphone noise cancellation designs, pairing this with the bottom-port MSM-261S4030H creates an effective solution with matched acoustic performance."
Enhanced 65dB SNR with flexible top-port mounting for diverse applications
— Jennifer Liu, BeiLuo
Frequently Asked Questions
What are the advantages of top-port vs bottom-port microphones?
Top-port microphones have the acoustic port on the top surface of the package, while bottom-port microphones have the port on the bottom. Top-port advantages: 1) Easier acoustic sealing when microphone faces upward; 2) Simplifies PCB layout in thin products; 3) Direct sound path without PCB obstruction. Bottom-port advantages: 1) Better protection from dust and moisture; 2) More common footprint compatibility; 3) Often preferred for smartphone applications. Choose based on your product's mechanical design and acoustic requirements. Both types offer equivalent electrical performance.
Select top-port for upward-facing applications or space-constrained designs. Choose bottom-port for standard smartphone/tablet applications.
Can I mix top-port and bottom-port microphones in an array?
Yes, you can mix top-port (MSM-261S4031H) and bottom-port (MSM-261S4030H) microphones in an array. Both microphones have matched acoustic specifications (-26dBV sensitivity, similar frequency response), ensuring consistent performance. This configuration is useful when: 1) PCB layout constraints require different orientations; 2) Creating directional arrays with microphones facing different directions; 3) Optimizing acoustic path in complex product designs. Ensure proper acoustic sealing for each microphone type. The PDM interface allows both to share the same clock and data lines with different LR pin configurations.
Mixing port types is fully supported. Ensure matched sensitivity (-26dBV) and proper acoustic sealing for each microphone.
What is the acoustic overload point of the MSM-261S4031H?
The MSM-261S4031H has an acoustic overload point (AOP) of 120dB SPL, meaning it can handle sound pressures up to 120dB without significant distortion. This is sufficient for most voice and audio applications. For reference: 1) Normal conversation is 60-70dB SPL; 2) Loud music or shouting is 90-100dB SPL; 3) Very loud environments may reach 110-120dB SPL. The microphone maintains linear operation below 120dB SPL. For applications with extremely high sound pressures, consider adding external acoustic attenuation or contact our FAE for specialized solutions.
120dB AOP is sufficient for most applications. Contact our FAE if your application involves sound pressures exceeding this level.
How does temperature affect microphone performance?
The MSM-261S4031H is designed to operate from -40°C to +85°C with minimal performance variation. Temperature effects include: 1) Sensitivity variation less than ±1dB across the full range; 2) SNR remains within specification; 3) Frequency response is stable; 4) Current consumption increases slightly at high temperatures. The AEC-Q100 qualification includes rigorous temperature cycling tests. For applications outside this range, contact our FAE for extended temperature options. The microphone will operate outside the specified range but performance is not guaranteed.
The microphone maintains excellent performance across its rated temperature range. For extreme temperature applications, consult our FAE team.
What is the power supply rejection ratio (PSRR)?
The MSM-261S4031H features excellent power supply rejection ratio of -80dB typical, meaning noise on the power supply is attenuated by 80dB before reaching the output. This high PSRR reduces the need for extensive power supply filtering. However, good design practice still recommends: 1) 100nF decoupling capacitor close to the microphone; 2) Separate power routing from noisy digital circuits; 3) Ferrite beads for additional filtering in noisy environments. The high PSRR is particularly beneficial in systems with shared power supplies where digital switching noise might otherwise affect audio quality.
The excellent PSRR simplifies power supply design. Use standard decoupling practices for best results.