SMD Transistor in Mobile Phone and Their Function

Surface Mount Device Transistor (SMD Transistor)  is an SMD electronic component made up of semiconductor material like silicon or germanium. it is made by two diode.its also called double diode.

Type of SMD Transistor

1. NPN 

2. PNP 

SMD Transistor Circuit Symbol 

 

Terminals of a Transistor

There are three terminals of a surface mount transistor or thru-hole transistor:

1. 1.      Ammeter (E) – Flows current on receipt of forward bias. Electrons are emitted in NPN transistors whereas PNP transistors emit ‘holes’.
   2.      Collector (C) – The terminal of the transistor which receives the emitted electrons or holes. Collector always works or reverse bias mode.
   3.      Base (B) – The layer between ammeter and collector is called base. Base displays the property of showing low resistance in ammeter junction forward bias and high in collector junction reverse bias.
   
   
   

SMD Transistor

1.     Indicating Character: D or V, TR

2.     Function: Switching, Amplification, Regulating Voltage ( AC to convert into DC).

3.     Unit: Transistors are identified according to the code.

SMD Transistor Type

How To Check SMD Transistor by digital Multimeter