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What is SMD transistor

SMD is abbreviation of Surface Mount Devices. In surface mount technology component directly place and solder on PCB surface. No hole is required to mount and sold component. These components pins normally bend leads or lead less packages like BGA or QFN with balls or pads. These components are SMD components

Nearly all type of electronic components available in SMD packages. Transistors including BJT, MOSFET, JFET, UJT, thyristors are available in SMD packages. Even old through hole transistors equivalent available in SMD for example 2N2222a is equivalent to MMBT2222A(SOT23) and 2N3906 is equivalent to MMBT3906(SOT23). Like BJT most of IRFxxx series MOSFET’s also available in SMD Packages,

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