MSM-261S4031A
Top-port analog output MEMS microphone with -38dBV sensitivity, 63dB SNR, and ultra-low 140uA power consumption for consumer electronics.
Product Overview
Description
The MSM-261S4031A is a top-port analog MEMS microphone designed for consumer electronics requiring flexible mounting options and low power consumption. The top-port configuration enables innovative product designs.
With -38dBV sensitivity and 63dB SNR, this microphone delivers quality audio capture suitable for a wide range of consumer applications. The analog output provides simple integration with existing audio circuits.
Ultra-low power consumption of 140uA makes this microphone ideal for battery-powered wearables and IoT devices. The top-port design simplifies acoustic integration in space-constrained products.
Product Series
MSM
Primary Application
Smartphones and tablets
Key Features
- Top-port configuration for flexible mounting
- Ultra-low power consumption 140uA typical
- 63dB SNR for quality audio capture
- Analog output for simple integration
- Compact surface-mount package
- Cost-effective for high-volume applications
Specifications
| Sensitivity | -38dBV |
|---|---|
| SNR | 63dB |
| Frequency Response | 100Hz - 10kHz |
| Current Consumption | 140uA |
| Package | 3.76 x 2.95 x 1.1mm |
| Output Type | Analog |
| Operating Temperature | -20°C to +70°C |
| Qualification | Consumer Grade |
Applications
Smartphones and tablets
Electronic system design
Wearable devices
Electronic system design
IoT and smart home devices
Electronic system design
Bluetooth headsets
Electronic system design
Voice-activated controllers
Industrial automation and control
Consumer electronics
Consumer electronics
FAE Expert Insights
"The MSM-261S4031A is perfect for wearable and IoT applications where top-port mounting is required and power consumption is critical. The 140uA current draw is exceptional - among the lowest in the industry. The top-port design is essential for smartwatch and fitness tracker designs where the microphone must face outward from the wrist. I've used this microphone in several wearable projects with excellent results. The analog output integrates seamlessly with low-power audio codecs. The -38dBV sensitivity provides good signal levels for most codec ADCs without additional gain stages. While the 63dB SNR is slightly lower than the digital version, it's more than adequate for voice command and basic audio applications in wearables. The price-performance ratio makes this very competitive for high-volume consumer products."
Ultra-low 140uA power with flexible top-port mounting for wearables
— Alex Zhang, BeiLuo
Frequently Asked Questions
What makes the MSM-261S4031A suitable for wearables?
The MSM-261S4031A is ideal for wearables due to: 1) Ultra-low 140uA power consumption - critical for battery life in small devices; 2) Top-port design - allows microphone to face outward from the wrist or body; 3) Compact 3.76mm x 2.95mm package - fits in space-constrained designs; 4) Analog output - simple integration with low-power audio codecs common in wearables; 5) Cost-effective - competitive pricing for high-volume production. The combination of low power, small size, and flexible mounting makes it perfect for smartwatches, fitness trackers, and hearables.
For wearable applications, prioritize the 140uA power consumption and top-port mounting flexibility. Contact our FAE for wearable-specific integration guidance.
How do I minimize power consumption with the MSM-261S4031A?
To minimize power consumption: 1) Use the lowest acceptable supply voltage (1.5V-3.6V range); 2) Power down the microphone when not in use (shutdown current <1uA); 3) Use voice activity detection to wake the system only when needed; 4) Keep clock and data lines quiet when microphone is active; 5) Consider duty-cycling for intermittent audio capture. The 140uA typical current is already very low, but proper power management can extend battery life significantly. For always-listening applications, the microphone can remain powered continuously with minimal impact on battery life.
Implement power-down when not in use. The microphone's fast wake-up time enables aggressive power management strategies.
What is the recommended ADC for use with this microphone?
The MSM-261S4031A works well with most audio ADCs. Recommended options include: 1) Low-power codecs like TI TLV320AIC3100 or Cirrus Logic WM8940 for wearables; 2) Integrated MCU ADCs with audio capability (STM32, nRF52 series); 3) Dedicated voice processors for voice recognition applications. Key considerations: 1) Input impedance >10k ohm; 2) Input voltage range compatible with microphone output (typically 0.5-1.5V peak); 3) Sampling rate support (8kHz-48kHz typical). The -38dBV sensitivity provides adequate signal levels for most ADCs without additional gain. Contact our FAE for specific codec recommendations based on your application.
Choose an ADC with appropriate input range and low power consumption. Most modern audio codecs work well with this microphone.
Can this microphone be used for voice recognition applications?
Yes, the MSM-261S4031A can be used for voice recognition applications, though with some considerations: 1) 63dB SNR is adequate for close-talk voice recognition (smartphones, wearables); 2) -38dBV sensitivity works well for near-field applications; 3) For far-field voice recognition, consider the higher-SNR digital version (MSM-261S4031H); 4) Implement proper acoustic design to minimize background noise. The microphone has been successfully used in voice-activated wearable devices and IoT products. For best voice recognition performance, position the microphone close to the user's mouth and implement noise reduction algorithms.
Suitable for close-talk voice recognition. For far-field applications, consider the digital version with higher SNR.
What is the phase response of the MSM-261S4031A?
The MSM-261S4031A has linear phase response across the audio frequency range (100Hz-10kHz), which is important for multi-microphone applications like beamforming and noise cancellation. Phase matching between microphones is typically within ±5 degrees, ensuring coherent signal combination in arrays. The linear phase response preserves the time-domain characteristics of audio signals, critical for accurate voice recognition and high-quality audio capture. For beamforming applications, consistent phase response across all microphones in the array is essential for proper directional sensitivity patterns.
The linear phase response is ideal for array applications. For beamforming, use matched microphones from the same production lot for best phase consistency.