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n-p-n

n-p-n Electronics.
  (ˌɛnˌpiːˈɛn)
  Also npn, and in capitals.
  Designating a semiconductor device in which a p-type region is sandwiched between two n-type regions.

1951 W. Shockley et al. in Physical Rev. LXXXIII. 151/1 The p-n-p transistor has been discussed previously... In this article we shall consider..the n-p-n transistor. 1962 Simpson & Richards Physical Princ. Junction Transistors iii. 46 In the manufacture of n-p-n grown-junction transistors, the p-type section is grown for a very short time to give a thin base layer. 1967 Electronics 6 Mar. 4/2 Transistors Types: PNP and NPN. 1969 J. J. Sparkes Transistor Switching v. 126 Using npn transistors, pulsed R-S flip-flops using three basic types of pulse steering are available.

Oxford English Dictionary

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