I need an npn transistor to switch the cathodes of a 4 digit 7 segment led display. I don't want to get something meant for too high of a rating and have it mean I'm not providing enough power to actually operate it, or something. How do I choose the one I need? Do I just need the rating to exceed my use, or do I need to be close in terms of Voltage, Power Dissipation, and Collector Current?
Thanks
Thanks
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