Noctua NF-A4x20 5V PWM, Premium Quiet Fan, 4-Pin, 5V Version (40x20mm, Brown)
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Robert Shane Stookey
12-06-2025Installed on my Jetson Nano. Works great.
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Cody Hanson
> 3 dayQuieter then the Noctua 40x10mm fans and better air flow
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scandoslav
> 3 dayThe rubber anti-vibration pads can squeeze out and detach if you sandwich the fan between a fan guard and a Jetson Nanos heat sink then bolt it down tight.
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Jack T. Dicus
> 3 dayPlugged right into my nVidia Jetson Nano. Variable speed works great.
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Thomas J. Coyle III
Greater than one weekThis fan is quite and keeps the Nano from throttling back during extensive AI/DL, however the cable is way too long for a NVIDIA Nano and had to be bunched up between the Nano heat sink and the top of the SBC case.
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Yingnan Wang
> 3 dayI use M2.5 screw and M2.5 nut as washer.
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C. Capeland
> 3 dayFor this tiny size, these are amazingly quiet and effective. Really a marvel.
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Bob
Greater than one weekThis worked perfectly. Made my printer so much quieter
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George
> 3 dayIts a little tall in proportion to the Jetson Nano but it works great.
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J Heck
> 3 dayLooked up the wiring diagram on Noctua to make sure I had it right, looked up an easy little PWM can script, and fired right up. Only had to plug it into 5V, Ground, and the PWM pin set in the script. Works awesome, and its the same price as the non-PWM fan. Its almost silent if youre right by it. If your more than a few feet away you wont hear it on high.
Featuring advanced aerodynamic design measures such as Flow Acceleration Channels and an AAO frame, the NF-A4x20 5V PWM is a PWM enabled 5V variant of Noctua’s highly optimised, premium quality quiet 40x20mm fan. The custom designed NE-FD3 PWM IC that integrates Smooth Commutation Drive technology and Noctua’s reference class SSO2 bearings assure superb running smoothness and excellent long-term stability. Topped off with modular cabling and the OmniJoin Adaptor Set, the NF-A4x20 5V PWM is a premium choice for demanding 5V applications that require PWM control.
5V PWM version
Many devices such as network or storage solutions use 5 volt 40mm fans with PWM speed control. With the same operating voltage, PWM support and the included OmniJoin adaptor set that makes it compatible with proprietary fan headers, the NF-A4x20 5V PWM is ideal for replacing noisy or broken 5V 40mm fans with PWM.
Please Note: Being a 5V fan, the NF-A4x20 5V PWM cannot be run at 12V and will be damaged when used with typical 12V power sources such as PC motherboard fan headers.
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Flow Acceleration ChannelsThe NF-A4x20 impeller features suction side Flow Acceleration Channels. By speeding up the airflow at the crucial outer blade regions, this measure reduces suction side flow separation and thus leads to better efficiency and lower vortex noise. |
SSO2 BearingThe NF-A4x20 features the further optimised second generation of Noctua"s renowned, time-tested SSO bearing. With SSO2, the rear magnet is placed closer to the axis to provide even better stabilisation, precision and durability. |
Integrated Anti-Vibration PadsIntegrated Anti-Vibration Pads made from extra-soft silicone minimise the transmission of minute vibrations while maintaining full compatibility with all standard mounting systems and fan clips used on heatsinks. |
Scope of delivery
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Please Note:
Being a 5V fan, the NF-A4x20 5V PWM cannot be run at 12V and will be damaged when used with typical 12V power sources such as PC motherboard fan headers.
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| NF-A4x20 PWM | NF-A4x20 FLX | NF-A4x20 5V PWM | NF-A4x20 5V | |
| Connector | 4-pin PWM | 3-pin | 4-pin PWM | 3-pin |
| Voltage | 12V | 12V | 5V | 5V |
| RPM | Max: 5000 / Min: 1200 | 5000 | Max: 5000 / Min: 1100 | 5000 |
| RPM with L.N.A. | 4400 | 4400 | - | - |
| RPM with U.L.N.A. | - | 3700 | - | - |
| Acoustical Noise | 14,9 dB(A) | 14,9 dB(A) | 14,9 dB(A) | 14,9 dB(A) |
| Acoustical Noise with L.N.A. | 12,2 dB(A) | 12,2 dB(A) | - | - |
| Acoustical Noise with U.L.N.A. | - | 8,5 dB(A) | - | - |
| Size | 40x40x20 mm | 40x40x20 mm | 40x40x20 mm | 40x40x20 mm |
| Colour | Brown & Beige | Brown & Beige | Brown & Beige | Brown & Beige |