I've read a bit about this but there seems to be much ambiguity.
When using common cathode seven segment display LEDs would you use NPN or PNP? Or can you use either?
Electronic – NPN or PNP transistor for common-cathode seven segment display LEDs
7segmentdisplaylednpnpnp
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Best Answer
There are 2 possible combinations :
simulate this circuit – Schematic created using CircuitLab
The PNP circuit must be driven with inverted signal and it is a bit less efficient than the other.