I'm making a 24x16 LED matrix. If I drive a whole row of 24 LEDs @ 120mA I'll need a row transistor that can handle 2.88A, so 3A.
If the supply voltage is 5V then peak power is 15W; average dissipation (each transistor on 1/16th of the time) under one watt.
The driver for the transistors is the output of a pair of 74hc138 3:8 decoders, active low, so I need PNP transistors.
Am I missing anything, and if not is this part acceptable?
Finally, do I need a resistor between the decoder pin and the transistor base?
Thanks in advance.