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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NF-A4x20 5V PWM

Product ID: 43512932

Details

Brand
Noctua
Compatible Devices
Desktop
Cooling Method
Air
Material
Fibre-glass
Maximum Rotational Speed
5000 rpm
Noise Level
14.9 db

⚡5V 4-pin PWM control

🌀5000 RPM max speed

🔇Ultra-quiet 14.9 dB(A)

$36.58

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Sold byAmazon British Virgin IslandsDelivered byDesertcartCustomer service byDesertcartReturns14 days · 30 with PRO

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Description

🌀 Stay cool, stay ahead — silent power in a compact form!

COMPACT YET MIGHTY - 40x40x20 mm size fits perfectly in tight spaces like NVIDIA Jetson Nano and 1U servers.
PRECISION PWM CONTROL - Seamlessly adjust fan speed up to 5000 RPM for tailored airflow and efficiency.
PLUG PLAY VERSATILITY - Includes anti-vibration mounts, OmniJoin adaptor, and extension cable for effortless installation.
WHISPER QUIET POWERHOUSE - Experience top-tier cooling with barely-there noise at just 14.9 dB(A).
AWARD WINNING AERODYNAMICS - Flow Acceleration Channels and Acoustic Optimisation deliver superior cooling performance.

The Noctua NF-A4x20 5V PWM is a premium 40mm high-performance fan designed for ultra-quiet, efficient cooling in compact electronics. Featuring a max speed of 5000 RPM, advanced aerodynamic design, and PWM control, it’s ideal for devices like NVIDIA Jetson Nano, network equipment, and 1U servers. With a noise level as low as 14.9 dB(A) and a 6-year warranty, it combines reliability with whisper-quiet operation.

Specifications

ASIN	B071FNHVXN
Best Sellers Rank	#125 in Computer Case Fans
Brand Name	Noctua
Compatible Devices	Desktop
Cooling Method	Air
Customer Reviews	4.8 4.8 out of 5 stars (965)
Global Trade Identification Number	09010018100136
Item Dimensions L x W x H	1.57"L x 0.79"W x 1.57"H
Item Highlight	High Airflow Low Noise, 5V, 20mm Thick Fan, for Ventilation and Electronics Cooling, With OmniJoin Adaptor, 5000rpm 4-Pin PWM
Manufacturer	Noctua
Material Type	Fibre-glass reinforced PBT
Maximum Rotational Speed	5000 rpm
Model	NF-A4x205VPWM
Noise Level	14.9 db
Number of Items	1
Number of Packs	1
Part Number	NF-A4x20 5V PWM
Power Connector Type	4-Pin
Unit Count	1 Count
Voltage	5 volts
Warranty Description	6 year manufacturer’s warranty

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$36.58

Duties & taxes included

In stock

Sold byAmazon British Virgin IslandsDelivered byDesertcartCustomer service byDesertcartReturns14 days · 30 with PRO

Buyer Protection · Full refund if your order doesn't arrive as described.

Desertcart purchases this item on your behalf and handles shipping, customs, and support to British Virgin Islands.

Secure transaction

Trustpilot

TrustScore 4.5 | 7,300+ reviews

Sneha T.

Received my product in pristine condition. Great service overall.

1 month ago

Ayesha M.

The product exactly matches the description. Very satisfied with my purchase.

5 days ago

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