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FOUR LAYER DIODE (PNPN Diode) The four layer diode is also known as 'shoockley diode'. It is made up of alternating layers of n-type and p-type semiconductor. The four layer diode was the first integrated circuit. Now a days four layer diodes known as thyrister PNPN is the type of four layer diode

PNPN diode Definition:- A semiconductor device consisting of four alternating layers of p-type and N-type semiconductor material with terminal connection to the two outer layers is known as pnpn diode .

DIODES,
SWITCHING CIRCUITS,

ALGEBRAS,

CIRCUITS,

COMPUTER LOGIC,
MATHEMATICAL ANALYSIS,
MATHEMATICAL LOGIC,
NEGATIVE RESISTANCE CIRCUITS,

SEMICONDUCTORS, THEORY