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)

EC$140

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Sold byAmazon Saint Kitts and NevisDelivered 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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EC$140

Duties & taxes included

In stock

Sold byAmazon Saint Kitts and NevisDelivered 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 Saint Kitts and Nevis.

Secure transaction

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TrustScore 4.5 | 7,300+ reviews

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