# Is resistor needed to drive NPN Transistor from EEPROM

And am using this transistor: https://www.onsemi.com/pub/Collateral/P2N2222A-D.PDF

I need my EEPROM I/O to be connected to other loads, so I am using the NPN transistor in a switch configuration. However, I am unable to find the max current supplied by the EEPROM so I am unsure if I need to put a resistor in between the EEPROM and Base. (If resistor is too high the current supplied by the EEPROM won't be sufficient to drive the NPN transistor). So do I need a resistor? The load I am attempting to drive is a 555 timer.

• Yes, resistor is needed – Gregory Kornblum Nov 25 '18 at 13:32
• Tip: Put the actual part numbers in the hyperlink. I am using a [2N2222A](https://www.onsemi.com/pub/Collateral/P2N2222A-D.PDF) transistor. It makes the text more legible, your question will read much better and we won't have to follow links to understand your question. Post a schematic of your idea for comment. (There's a CircuitLab button on the editor toolbar and there is a 555 component in the library - although the pin arrangement on it is a bit quirky.) – Transistor Nov 25 '18 at 13:36