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Description: For a long time we've had small 7-segment displays and huge 7-segment displays, but now we finally have something in between. These 20mm 4-digit 7-segment displays are big enough to see from a distance but not so big that you'd have trouble finding an enclosure for them.

These common-cathode displays feature 4 x 7-segment digits and one decimal point per digit. The LEDs have a forward voltage of 1.9VDC and a max forward current of 20mA.

Dimensions: 71.6 x 25.7mm

Documents:

Comments 12 comments

  • Has anyone figured out the pin layout for controlling this display?

    • All the segments share the same pins, with the exception of the cathode. To display a single digit, pull that cathode high, with all the other cathodes low. to display all the digits, cycle through the cathodes while changing the pins to match.

    • Still no data sheet or pin layout?

  • which pin is pin #1? I am using 4 - 74ls47 chips to control the display of each digit of this product’s display. The datasheet doesn’t explain which pin is power and ground. Thanks for your help.

    • If you have the display facing you with the decimal points at the bottom, then pin 1 is the left-most pin on the bottom row of pins..just as the datasheet indicates :)

      There’s more than 1 power and more than 1 ground pin.. that is to say, each digit on this display has its own ground pin (the common cathode), and then there’s 8 ‘power’ pins (the anodes) for each segment.
      ( The above applies if this display is common cathode as per the description - swap anode/cathode if it’s common anode, as per Member #470208’s comment. )

      The 74ls47 you’re using is intended for a single digit - you can still use one with this display to drive the segments, but you’ll need something else to select which digit is ‘active’.

  • Arg, this is NOT common cathode, it is common anode. As in, I hook up pin 6 (one of the common pins) to +5V VCC and hook up pin 1 to GND via a resistor (one of the segment pins) and the segment lights up. Inverting that wiring and the segment does not light up. When hooking this up to a MAX7219CNG chip, all the segments are lit regardless of display test mode, etc (a common problem when hooking up a MAX7219CNG to a common anode display).

  • Is there an Eagle library for this? Can’t seem to find it in the normal Sparkfun lib on git hub. Will make it if I need to, but would rather just use something that is already there.

    • Assuming the datasheet linked to is correct, the pinout matches the part 7-SEGMENT-4DIGIT-COUNTER-PTH in SparkFun-Displays.lbr .

  • Just a heads up that the silkscreen outline for this in the Eagle library appears to be about 7mm too narrow.

  • Now what we need is these larger displays with the serial/arduino interface like the smaller COM-11441 displays.

  • I found the datasheet through another website. Half of it’s in Chinese, but it’s better than nothing.

    http://dlnmh9ip6v2uc.cloudfront.net/datasheets/Components/LED/ATA%20datasheet%20red%20ATA8041BR.pdf

    • This datasheet states that the display is common anode. But according to my test it is common cathode.


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