PMOF-9745P-39UQ Mallory Sonalert Loudspeaker or Buzzer (Other) In Stock
The Mallory Sonalert PMOF-9745P-39UQ is an analog omnidirectional electret condenser microphone with a -39dB sensitivity, housed in a compact 9.7mm x 4.5mm cylindrical package with PCB pin termination. It offers a broad pickup pattern for voice and sound capture in consumer and industrial electronics applications. Suitable for intercom systems, voice recognition modules, hearing aids, and portable audio devices requiring a reliable, space-efficient microphone solution.
- Manufacturer
- Mallory Sonalert
- Package
- Other
- Pin Count
- 2
- Lifecycle
- ACTIVE
- Datasheet
- PMOF-9745P-39UQ Datasheet PDF
- Category
- Loudspeaker or Buzzer
- Price
- From $0.2672(MOQ 1)
- RoHS
- Compliant
- Lead Time
- 3–7 business days
- Shipping
- DHL Express · Worldwide
Key Features
- Omnidirectional pickup pattern captures sound equally from all directions at 360° for versatile voice and ambient audio recording
- -39dB sensitivity provides balanced output level suitable for voice recognition, intercom, and teleconferencing microphone circuits
- Compact 9.7mm x 4.5mm cylindrical form factor with PCB pin termination enables direct through-hole board mounting without additional hardware
- Analog output interface simplifies direct connection to standard audio amplifier and codec circuits without additional ADC components
- Electret condenser technology delivers consistent frequency response across the human voice range (typically 20Hz to 20kHz) in a sealed housing
Applications
The PMOF-9745P-39UQ is commonly used in desktop and portable intercom systems, voice-activated control panels, and speech recognition front-ends where a compact, PCB-mountable omnidirectional microphone is required. Its -39dB sensitivity and analog output make it directly compatible with standard microphone preamplifier circuits and audio codec front-ends used in consumer electronics, industrial HMI panels, and home automation hubs. The cylindrical 9.7mm x 4.5mm package also suits integration into handheld instruments, medical monitoring devices, and IoT voice interface modules where board real estate and weight are constrained.
Compliance & Regulatory
| RoHS Status | Compliant |
| Lead-Free | Yes (Pb-Free) |
Alternate & Equivalent Parts
Compatible alternatives and drop-in replacements for PMOF-9745P-39UQ:
suggested
Frequently Asked Questions
What does the -39dB sensitivity rating of the PMOF-9745P-39UQ mean for microphone preamplifier design?
A -39dB sensitivity means the PMOF-9745P-39UQ outputs -39dBV (approximately 11mV) per Pascal of acoustic pressure at 1kHz, referenced to 94dB SPL (1Pa). This output level is standard for electret condenser microphones and is directly compatible with typical microphone preamplifier input stages designed for -40dBV to -35dBV input sensitivity, requiring approximately 30dB to 50dB of gain to bring the signal to a 1V line level. Designers should target a noise floor of at least 20dB below the -39dB output level to achieve acceptable SNR for voice applications.
How does the omnidirectional polar pattern of PMOF-9745P-39UQ affect placement in an intercom or voice recognition enclosure?
The omnidirectional polar pattern of the PMOF-9745P-39UQ provides uniform sensitivity within ±3dB across all azimuthal angles at 1kHz, meaning the microphone captures sound equally well from the front, sides, and rear. In intercom and voice recognition applications, this eliminates the need to precisely orient the microphone toward the speaker, reducing mechanical design constraints. However, omnidirectional capsules also pick up background noise from all directions, so acoustic enclosure design with a minimum 5mm x 5mm sound port aperture and internal damping material is recommended to optimize speech intelligibility in noisy environments above 60dB SPL.
What biasing circuit does the PMOF-9745P-39UQ require, and what supply voltage range is typical for electret condenser microphones?
The PMOF-9745P-39UQ is an electret condenser microphone requiring a DC bias voltage, typically 1.5V to 10V, supplied through a load resistor (commonly 2.2kΩ to 10kΩ) connected between the microphone's drain pin and the positive supply. The built-in FET buffer inside the electret capsule draws approximately 0.1mA to 0.5mA from this bias supply, so a 3.3V or 5V system supply with a 2.2kΩ series resistor provides adequate bias for most applications. The audio output is taken from the junction of the load resistor and the microphone pin, typically through a 0.1µF DC-blocking capacitor.
How does the 9.7mm x 4.5mm PCB-pin package of PMOF-9745P-39UQ compare to surface-mount microphone alternatives for production assembly?
The PMOF-9745P-39UQ uses a through-hole PCB pin package measuring 9.7mm in diameter and 4.5mm in height, which requires manual or automated through-hole insertion rather than pick-and-place SMT assembly. This adds approximately 5 to 10 seconds per board in manual assembly or requires specialized radial insertion equipment in automated lines. SMT electret microphone alternatives in 3528 or 4.0mm x 3.0mm packages are compatible with standard pick-and-place machines and reflow ovens, reducing assembly cost in volumes above 500 units per month. The through-hole PMOF-9745P-39UQ is preferred when the microphone must protrude through a front panel port or when vibration resistance from mechanical solder joint strength is prioritized over assembly throughput.
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About Mallory Sonalert
Mallory Sonalert is a leading electronic component manufacturer. FindMyChip sources Mallory Sonalert ICs directly from authorized China distributors, offering competitive pricing and reliable stock.
| Qty. | Unit Price | Ext. Price |
|---|---|---|
| 1+ | $0.7200 | $0.72 |
| 10+ | $0.5590 | $5.59 |
| 5000+ | $0.2685 | $1342.50 |
| 7500+ | $0.2678 | $2008.50 |
| 10000+ | $0.2672 | $2672.00 |
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