I needed a 2N 2222A transistor. And from a electronics shop I got the transistor with following symbols,

KSP 2222A -1426

I have already searched and know that KSP is the name of a manufacturing company. KSP - Components, Semiconductors, Capacitors

  1. I want to know what the last digits mean?

  2. I also do not know whether it's NPN or PNP.

  • \$\begingroup\$ If you grant that the part is a version of the 2N2222, why do you have any doubt about PNP or NPN? \$\endgroup\$ Sep 28, 2017 at 4:04
  • \$\begingroup\$ I know that 2N2222 indicates NPN. But the transistor has 2222A written over it. Not 2N2222. That's why I am not sure. \$\endgroup\$
    – user141242
    Sep 28, 2017 at 5:40

1 Answer 1


A simple google search of "KSP 2222A" would have returned on the first line this datasheet, which clearly states what a KSP 2222A is.

enter image description here

It's basically the 2N2222A in plastic package (exactly the same specs), therefore is an NPN.

The 1426 is likely a production date-code. 2014, 26th week.

Note: The 2N2222 (without A), instead, has smaller ratings (breakdown voltages) and performance (smaller fT) with respect to 2N2222A and its plastic version PN2222A-KSP2222A.

  • \$\begingroup\$ I had done google search and tried to read exactly this data sheet but couldn't understand. So thanks a lot for helping me. \$\endgroup\$
    – user141242
    Sep 28, 2017 at 8:04

Your Answer

By clicking “Post Your Answer”, you agree to our terms of service and acknowledge you have read our privacy policy.

Not the answer you're looking for? Browse other questions tagged or ask your own question.