Can these be wired to a usb connector and run off a usb wall charger?

Yes. I run mine off of the gpio pins on a raspberry pi. That's the same concept.

Does this noctua nf-a4x20 5v pwm premium-quality quiet 40mm fan come with the mounting screws?

Yes, it comes with screws a couple of different connectors for attaching it to 3 and 4 pin connections also some rubbery plug things to pull through the mount holes.

Can a 3.3v PWM signal be used to control fan speed?

Yes, a 3.3V logic (PWM) signal will control this fan. I use an Arduino DUE board to control this fan. The DUE puts out 3.3V logic signals.

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Noctua NF-A4x20 5V PWM, Premium Quiet Fan, 4-Pin, 5V Version (40x20mm, Brown)

Product ID: 43512932

Details

Brand
Noctua
Compatible Devices
Desktop
Cooling Method
Air
Global Trade Identification Number
Material
Fibre-glass
Maximum Rotational Speed
5000 RPM

⏳>150,000 hours MTTF reliability

🔇Ultra-quiet 14.9 dB(A)

⚙️5000 RPM max speed

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COP 130734

Duties & taxes included

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Sold byAmazon ColombiaDelivered byDesertcartCustomer service byDesertcartReturns14 days · 30 with PRO

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Description

🌀 Silent strength in a compact frame—cool smarter, not louder.

BUILT TO LAST - Engineered with fibre-glass reinforced PBT and backed by a 6-year warranty, ensuring unmatched durability and peace of mind.
SMART PWM CONTROL - 4-pin PWM interface delivers dynamic speed adjustments up to 5000 RPM, optimizing cooling exactly when you need it.
COMPACT PRECISION FIT - Sized at 40x20mm, tailor-made for NVIDIA Jetson Nano, 1U servers, and network gear—upgrade your tech without bulk.
WHISPER QUIET POWERHOUSE - Experience premium airflow with barely-there noise at just 14.9 dB(A), perfect for focused workspaces and sleek setups.
ALL INCLUSIVE INSTALLATION KIT - Comes with anti-vibration mounts, screws, extension cable, and OmniJoin adaptor—plug and play with confidence.

The Noctua NF-A4x20 5V PWM is a premium, ultra-quiet 40x20mm cooling fan designed for 5V applications like NVIDIA Jetson Nano and network equipment. Featuring a max speed of 5000 RPM, advanced acoustic optimization, and a 4-pin PWM connector, it delivers efficient, whisper-quiet airflow with exceptional reliability over 150,000 hours MTTF. Included accessories ensure easy installation and vibration-free operation, all backed by a 6-year warranty.

Specifications

ASIN	B071FNHVXN
Best Sellers Rank	#227 in Computer Case Fans
Brand Name	Noctua
Compatible Devices	Desktop
Cooling Method	Air
Customer Reviews	4.8 4.8 out of 5 stars (923)
Global Trade Identification Number	09010018100136
Item Dimensions L x W x H	1.57"L x 0.79"W x 1.57"H
Item Weight	84 Grams
Manufacturer	Noctua
Material Type	Fibre-glass reinforced PBT
Maximum Rotational Speed	5000 RPM
Model	NF-A4x205VPWM
Noise Level	14.9 Decibels
Number of Items	1
Part Number	NF-A4x20 5V PWM
Power Connector Type	4-Pin
Unit Count	1.0 Count
Voltage	5 Volts
Warranty Description	6 year manufacturer’s warranty

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