Noctua NF-A6X25 – 5V PWM 60x25mm Quiet Cooling Fan

Featuring advanced aerodynamic design measures such as Flow Acceleration Channels and an AAO frame, the NF-A6x25 5V PWM is a PWM-enabled 5V variant of Noctua’s highly optimised, premium quality quiet 60x25mm fan.

The custom-designed NE-FD1 PWM IC that integrates Smooth Commutation Drive technology and Noctua’s reference class SSO2 bearings guarantee superb running smoothness and excellent long-term stability. Topped off with modular cabling, the OmniJoin Adaptor Set and a 6-year manufacturer’s warranty, the NF-A6x25 5V PWM is a premium choice for demanding 5V applications that require PWM control.

PLEASE NOTE: Being a 5V fan, the NF-A6x25 5V PWM cannot be run at 12V and will be damaged when used with typical 12V power sources such as PC motherboard fan headers.

Popular with Raspberry Pi users!

As it’s a 5V PWM fan, we’ve seen a few Raspberry Pi owners hack the NF-A6x25 into their custom cooling setups for their projects! For example, there’s a GitHub repo here with a temp control daemon using this fan, which took inspiration from this article (have a Google though, there are many ways to achieve the same thing).

5V PWM version

Many devices, such as network or storage solutions, use 5 volt 60mm 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-A6x25 5V PWM is ideal for replacing noisy or broken 5V 60mm fans with PWM.

Polarity protection

As many devices using 5V fans feature proprietary connectors and documentation of the pin alignment may not be available, the fan features an integrated diode for polarity protection. This way, you’re on the safe side if you accidentally connect it with reverse polarity.

Reduced Motor Hub Size

Thanks to its streamlined, compact motor design, the NF-A6x25’s motor hub is smaller than with conventional 6cm fans. This allows for more blade surface area and thus contributes to the NF-A6x25’s superior airflow and pressure performance.

Flow Acceleration Channels

The NF-A6x25 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.

AAO Frame

Noctua’s AAO (Advanced Acoustic Optimisation) frames feature integrated anti-vibration pads as well as Noctua’s proprietary Stepped Inlet Design and Inner Surface Microstructures, both of which further refine the fan’s performance/noise efficiency.

Stepped Inlet Design

Noctua’s Stepped Inlet Design adds turbulence to the influx in order to facilitate the transition from laminar flow to turbulent flow, which reduces tonal intake noise, improves flow attachment and increases suction capacity, especially in space-restricted environments.

Inner Surface Microstructures

With the tips of the fan blades ploughing through the boundary layer created by the Inner Surface Microstructures, flow separation from the suction side of the blades is significantly suppressed, which results in reduced blade passing noise and improved airflow and pressure efficiency.

Integrated Anti-Vibration Pads

Integrated 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.

Smooth Commutation Drive 2

The latest version of Noctua’s advanced Smooth Commutation Drive system ensures superb running smoothness by eliminating torque variations and switching noises. This makes the NF-A6x25 remarkably quiet even at very close distances.

SSO2 Bearing

The NF-A6x25 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.

OmniJoin Adaptor Set

Many devices featuring 60mm fans use proprietary fan headers, so the NF-A6x25 5V comes with Noctua’s OmniJoin Adaptor Set. Just cut the original fan’s cable, fix it to the adaptor using the supplied 3M Scotchlok connectors and you can plug the NF-A6x25 5V to proprietary fan headers!

6-year manufacturer’s warranty

Noctua fans are renowned for their impeccable quality and outstanding longevity. Like all Noctua fans, the NF-A6x25 features an MTBF of more than 150.000 hours rating and comes with a full 6-year manufacturer’s warranty.

Specifications

Size	60x60x25mm
Screw hole spacings	50x50mm
Connector	4-pin PWM
Bearing	SSO2
Blade Geometry	A-Series with Flow Acceleration Channels
Frame Technology	AAO (Advanced Acoustic Optimisation)
Rotational Speed (+/- 10%)	3000 RPM
Airflow	29,2 m³/h
Min. rotational speed	650 RPM (PWM, ±20%)
Acoustical Noise	19.3 dB(A)
Static Pressure	2.18 mm H2O
Max. Input Power	1.3 W
Max. Input Current	0.26 A
Voltage	5 V
MTBF	150,000 h
EAN barcode	9010018100044

Resources

• Installation Manual
• Information Sheet

Package Contents

• NF-A6x25 PWM 5V fan
• 4-pin Y-cable
• 30cm extension cable
• OmniJoin adaptor set
• 4 anti-vibration mounts
• 4 fan screws