All stock codes associated to this product
NF-A4x20-5V-PWM, NFA4x205VPWM
Overview
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 Noctuas highly optimised, premium quality
quiet 40x20mm fan. The custom designed NE-FD3 PWM IC that
integrates Smooth Commutation Drive technology and Noctuas
reference class SSO2 bearings guarantee superb running
smoothness and excellent long-term stability. Topped off with modular cabling,
the OmniJoin Adaptor Set and 6 years manufacturers warranty,
the NF-A4x20 5V PWM is a premium choice for demanding 5V applications that
require PWM control.
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.
Details
40x20mm size
Compared to Noctuas award-winning NF-A4x10, the NF-A4x20 is twice as thick,
which allows for increased static pressure performance and makes the NF-A4x20
ideal for demanding applications with high flow resistance.
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.
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.
Flow Acceleration Channels
The 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.
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.
Custom-designed PWM IC with SCD
Supporting fully automatic PWM speed control, the fan uses Noctua's
custom-designed NE-FD3 5V PWM IC that integrates Smooth Commutation Drive (SCD)
technology. By providing smoother torque impulses, SCD suppresses PWM switching
noises and thus makes the fan quieter at low speeds.
OmniJoin™ adaptor set
Many devices featuring 40mm fans use proprietary fan headers, so the NF-A4x20
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-A4x20 to proprietary fan headers!
Extensive cabling options
The fan's short 20cm primary cable minimises cable clutter in typical
applications while the supplied 30cm extension provides extended reach when
necessary. Both cables are fully sleeved and a 4-pin y-cable allows the
connection of a second fan to the same PWM fan header for automatic control.
SSO2 bearing
The 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.
6-year manufacturer's warranty
Noctua fans are renowned for their impeccable quality and outstanding
longevity. Like all Noctua fans, the NF-A4x20 features an MTTF of more than
150.000 hours rating and comes with a full 6-year manufacturers warranty.
Specifications
GENERAL |
|
Notes and warnings |
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. |
|
|
FAN |
|
Size |
40x40x20 mm |
Mounting hole spacing |
32x32 mm |
Connector |
4-Pin PWM |
Bearing |
SSO2 |
Blade Geometry |
A-Series with Flow Acceleration Channels |
Frame Technology |
AAO (Advanced Acoustic Optimisation) |
Rotational Speed (+/- 10%) |
5000 RPM |
Min. Rotational Speed (PWM, +/-20%) |
1100 RPM |
Airflow |
9,4 m/h |
Acoustical Noise |
14,9 dB(A) |
Static Pressure |
2,26 mm HO |
Max. Input Power |
0,5 W |
Max. Input Current |
0,1 A |
Voltage |
5 V |
Voltage PWM signal |
5 V |
MTTF |
> 150.000 h |
Scope of Delivery |
4-pin y-cable |
|
30cm extension cable |
|
OmniJoin adaptor set |
|
NA-AV3 anti-vibration mounts |
|
Fan screws |
Warranty |
6 years |