12VDC 4.7" x 1-1/2" (120 x 38mm) Fan

12VDC 4.7
Stock Number: 37126 FN
 Review Average:  
 Number of Reviews: 2
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This item is discontinued & is not being restocked.

Availibilty: In Stock   Units: 79

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Detailed Description

View PDF Data Sheet

P/N: DCH12038HV12B
Volts: 12VDC
Current: 2.5A
CFM: ~285
Noise: ~72db Loud!
Ball bearing Fan with Plastic blades & housing.
Input for PWM or DC speed control:
DC: 0-10V Linear Increase Above 1V
PWM: 25 to 30KHz @ <0.8V Low 3-10V High
Duty Cycle: 10-100% Linear increase above 10%
Black is Negative, Yellow is Positive, Blue is PWM input
7" Wire Leads with Molex Plug
Approvals: CE, RoHS
SQ: 4-11/16" (120mm) T: 1-1/2" (38mm) WT: .9

California Proposition 65 Warning WARNING: This product can expose you to chemicals including Nickel which is known to the State of California to cause cancer and which is known to the State of California to cause birth defects and/or other reproductive harm. For more information, go to www.P65Warnings.ca.gov

 Product ReviewsClick here to review this item
Powerful fan with touchy speed regulation input
I evaluated two of these fans. Minimum supply voltage to start the fan spinning is around 5.5V. Fan runs at full speed if blue control input is floated, at a very low speed if it is grounded. For speed control by analog voltage, the speed variation at 12Vs occurs between 0.60 and 0.67V, mostly between 0.60 and 0.65V. This suggests it was designed to be used with a sensor like the LM35, to keep a temperature at around 62C. 0.05V is 0.4% of a 12V supply, making it impractical to set speed with just a pot divider. Instead a single 20k rheostat to ground can be used, with speed variation occurring from 12k to 15k. The analog speed control is poorly implemented, being extremely sensitive to supply voltage variation, even if a stable reference is used for the speed control. PWM control does seem to work, however the speed is highly dependent on both Vs and on amplitude of the 27.5kHz PWM signal.
- H Bustani, NV
Excellent value for a powerful fan
These fans get the job done. A ton of airflow without that annoying whine so many high-power fans have. They are loud, but that is to be expected, these are 30 watt fans. The weird connector they come with is easily cut off and replaced with the more common 4-pin Molex KK connector. These work well in a computer system, with the caveat there is no tachometer output. If your system has a fan-fail alarm, make sure it is disabled for connectors you are using these with. I was concerned about the 0-10VDC control voltage thing, but they also seem to respond well to the 12VDC PWM signal provided by computer equipment. If they burn out after a few hours, I know what killed them I guess.
- Gordon, MI