Noctua NF-A4x20 5V PWM, Premium Quiet Fan, 4-Pin, 5V Version (40x20mm, Brown)
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John Branthoover
> 3 dayInstalled on a Jetson Nano. I had to buy M2.5 x 8mm screws / washers and nuts. Fan will not turn unless the tempature is high or you turn it on via a software command.
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Rorteach
> 3 dayThis is a quiet operating fan and it cools extremely well akso. It is easy to install and a Quality product!
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Customer Mr D
> 3 dayGreat quite fan with this and Igus Linear bearing cant here my printer run.
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Jack T. Dicus
> 3 dayPlugged right into my nVidia Jetson Nano. Variable speed works great.
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Asha Bartoletti
> 3 dayPerfectly silent, and brilliantly cools my jetson nano 4gb.
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C. Capeland
> 3 dayFor this tiny size, these are amazingly quiet and effective. Really a marvel.
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Jon Hanford
Greater than one weekIm using this to cool a Raspberry Pi running a 3d printing server. It would overheat causing the printer to stutter - but no longer. This fan is impressively small delivering impressive airflow and virtually silent. Im very satisfied.
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WesZ
> 3 dayThese are the best fans ever. Very quiet, easy to spin, move a lot of air and made of quality materials. They are a little on the expensive side, but thats because quality is more expensive.
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cm
> 3 dayGreat cooling fan and so quiet.
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Romkslrqusz
14-06-2025Purchased to cool my raspberry pi. Modified the pinout a bit. Its quiet and circulates air well - true to Noctuas reputation.
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 |