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You are here: Home / Archives for Electronic Devices and Circuit Theory

Understanding MOSFET Current Rating in Datasheets

Last Updated on February 15, 2021 by Swagatam 8 Comments

The post comprehensively explains the current rating of MOSFETs in their datasheets, and helps us to understand how it is calculated by the design engineers, keeping in mind the various […]

Filed Under: Electronic Devices and Circuit Theory

Understanding MOSFET Safe Operating Area or SOA

Last Updated on December 23, 2020 by Swagatam 4 Comments

If you are wondering or worried about precisely how much power your MOSFET can tolerate under extreme conditions, or under extreme dissipative situations, then the SOA figures of the device […]



Filed Under: Electronic Devices and Circuit Theory

Understanding MOSFET Avalanche Rating, Testing and Protection

Last Updated on December 3, 2020 by Swagatam 9 Comments

In this post we discuss MOSFET avalanche ratings, and learn how to understand this rating in the datasheet correctly, how the parameter is tested by the manufacturer, and measures to […]

Filed Under: Electronic Devices and Circuit Theory

What is IGBT: Working, Switching Characteristics, SOA, Gate Resistor, Formulas

Last Updated on November 25, 2020 by Swagatam 5 Comments

IGBT stands for Insulated-gate-Bipolar-Transistor, a power semiconductor which includes the features of a MOSFET’s high speed, voltage dependent gate switching, and the minimal ON resistance (low saturation voltage) properties of […]

Filed Under: Electronic Devices and Circuit Theory, Electronics Tutorial

Diac – Working and Application Circuits

Last Updated on March 18, 2020 by Swagatam 2 Comments

The diac is a two-terminal device having a combination of parallel-inverse semiconductor layers, which allows the device to be triggered through both directions regardless of the supply polarity. Diac Characteristics […]

Filed Under: Electronic Devices and Circuit Theory

Unijunction Transistor (UJT) – Comprehensive Tutorial

Last Updated on June 1, 2021 by Swagatam 1 Comment

A unijunction transistor is a 3 terminal semiconductor device which is unlike a BJT has only a single pn junction. It is basically designed to be used as a single-stage […]

Filed Under: Electronic Components, Electronic Devices and Circuit Theory, Electronics Tutorial

Solid State Relay (SSR) Circuit using MOSFETs

Last Updated on March 10, 2022 by Swagatam 101 Comments

SSR or Solid state relays are high power electrical switches that work without involving mechanical contacts, instead they use solid state semiconductors like MOSFETs for switching an electrical load. SSRs […]

Filed Under: Electronic Devices and Circuit Theory, Electronics Tutorial

Calculating Transistor as a Switch

Last Updated on April 30, 2022 by Swagatam 5 Comments

Although transistors (BJTs) are popularly used for making amplifier circuits, these can be also effectively used for switching applications. A transistor switch is a circuit in which the collector of […]

Filed Under: Electronic Devices and Circuit Theory

Photodiode, Phototransistor – Working and Application Circuits

Last Updated on October 5, 2019 by Swagatam 16 Comments

Photodiodes and phototransistors are semiconductor devices which have their p-n semiconductor junction exposed to light through a transparent cover, so that external light can react and force an electrical conduction […]

Filed Under: Electronic Devices and Circuit Theory, Electronics Tutorial, Infrared (IR), Mini Projects, Security and Alarm, Sensors and Detectors

Optocouplers – Working, Characteristics, Interfacing, Application Circuits

Last Updated on February 8, 2021 by Swagatam 27 Comments

OPTOCOUPLERS OR OPTOISOLATORS are devices that enable efficient transmission of DC signal and other data across two circuit stages, and also simultaneously maintain an excellent level of electrical isolation between […]

Filed Under: Electronic Components, Electronic Devices and Circuit Theory, Electronics Tutorial



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