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
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Fits perfectly on my breadboard. Buying this was great for learning one of the few ways led segment displays work to build on basic knowledge. Pin numbers are labeled for the schematic on the datasheet and pins 1 &12 are printed next to their pins underneath making it easy to figure out. Negative lead goes to digit selector and positive goes to letter(individual segment) that means only a single led segment is on at once. With the use of a microcontroller or equivalent you can rapidly change between which led segment is on. Because the rapid change happens faster than the eye can tell; it looks as if multiple leds are on. If you hook multiple letters/ digits up all at the same time you will be increasing current across a common node so keep in mind ohms law and the datasheet limits so you don’t damage anything.
This relatively inexpensive display works well after you know how it works. To that end, I published a basic hookup guide on hackster.io: