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Semiconductor Devices Guide

The document discusses different types of semiconductor devices including the DIAC. The DIAC is a bidirectional semiconductor switch that can be turned on in both forward and reverse polarities. It conducts after exceeding a breakover voltage (VBO) and remains conducting until the current drops below a holding current (IH). The DIAC's behavior is bi-directional, allowing it to operate on both halves of an alternating cycle. It can be used in lamp dimmer circuits, heat controls, and motor speed controls.

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69 views3 pages

Semiconductor Devices Guide

The document discusses different types of semiconductor devices including the DIAC. The DIAC is a bidirectional semiconductor switch that can be turned on in both forward and reverse polarities. It conducts after exceeding a breakover voltage (VBO) and remains conducting until the current drops below a holding current (IH). The DIAC's behavior is bi-directional, allowing it to operate on both halves of an alternating cycle. It can be used in lamp dimmer circuits, heat controls, and motor speed controls.

Uploaded by

sparsh
Copyright
© © All Rights Reserved
We take content rights seriously. If you suspect this is your content, claim it here.
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Download as XLSX, PDF, TXT or read online on Scribd
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Device Introduction Symbol Structure

PN Junction Diode
Zener Diode
BJT
JFET
MOSFET
VARACTER DIODE
PHOTOTRANSISTOR
SCR
DIAC The DIAC is a full-wave or bi-
directional semiconductor switch
that can be turned on in both
forward and reverse polarities. The
DIAC gains its name from the
contraction of the
words DIode Alternating Current.

TRIAC

UJT
Working Diagram Working and Principle Character

The DIAC is essentially a diode that conducts after a


'break-over' voltage, designated VBO, is exceeded. When
the device exceeds this break-over voltage, it enters the
region of negative dynamic resistance. This results in a
decrease in the voltage drop across the diode with
increasing voltage. Accordingly there is a sharp increase in
the level of current that is conducted by the device.The
diode remains in its conduction state until the current
through it drops below what is termed the holding current,
which is normally designated by the letters IH. Below the
holding current, the DIAC reverts to its high-resistance
(non-conducting) state.Its behaviour is bi-directional and
therefore its operation occurs on both halves of an
alternating cycle.
Application Advantage Disadvnatge

1. It can be used in the lamp


dimmer circuit. 2. It is used in
the heat control circuit. 3. It is
used in the speed control of a
universal motor.

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