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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.

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  • \$\begingroup\$ If you grant that the part is a version of the 2N2222, why do you have any doubt about PNP or NPN? \$\endgroup\$ – WhatRoughBeast Sep 28 '17 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 '17 at 5:40
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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.

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  • \$\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 '17 at 8:04

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