PNP Transistor 2N3906 as a Switch

2N3906 Application Circuits

2N3906 Characteristics / Parameters

Component CharacteristicsComponent Parameters
Type Designator2N3906
Transistor OutlinePackage TypeCASE:  TO-92, SOT-23 , SOT-223
Mounting StyleThrough Hole / Surface Mount
FamilyBJT, PNP
Material of TransistorSilicon
PolarityPNP
Maximum Power Dissipation500mW,  
Maximum Collector to Base Voltage-40V
Maximum Collector to Emitter Voltage-40V
Maximum Emitter Base Voltage-5V
Maximum Collector Current-200mA
Minimum hFE60
Maximum hFE300
FunctionAmplification / Switch
Manufacturers

  1. Central Semiconductor Corp.
  2. ON Semiconductor
  3. FAIRCHILD Semiconductor
  4. NXP PHILIPS
  5. Motorola
  6. ROHM Semiconductor
  7. TRANSYS ELECTRONICS Ltd.
  8. ST Semiconductor
  9. SEMTECH Corporation
  10. VISHAY General Semiconductor
  11. KEC Korea Electronics
  12. MCC Micro Commercial Components
  13. Micro Electronics Ltd.

 Three modes of Operating Region of Transistors are:

  1. Active Region
  2. Saturation Region
  3. Cut-off Region

1- Active Region Characteristics:

  • In 'Active Region' , the transistor operate as an 'Amplifier'
  • The Junction Base-Emitter is forward Biased.
  • The Junction Collector-Base is Reverse Biased.

2- Saturation Region Characteristics:

  • ​​In 'Saturation' region, the transistor operates as an 'Closed Switch'.
  • The 'Base' Electrode is Connected to Supply Voltage [ Vcc ]
  • The Junction Base-Emitter Voltage is greater than 0.6V i.e VBE > 0.6V.
  • The Junction Base-Emitter is Forward Biased.
  • The Junction Collector-Base is Forward Biased.
  • Maximum Saturation Collector Current [ Ic ] flows, i.e [ Ic=Vcc/R]
  • This condition of transistor is act as a 'Fully-ON' and this is 'Saturation Region'.
  • Collector to Emitter Voltage [ VCE ] is approximately equal to Zero ideally. i.e [ VCE = 0V ]

​3- Cut-Off Region Characteristics:

  • In 'Cut-off' region, the transistor operate as an 'Open Switch'.​
  • The 'Base' Electrode is Grounded to zero Voltage [ 0V ].
  • The Junction Base-Emitter Voltage is less than 0.6V i.e VBE < 0.6V.
  • The Junction Base-Emitter is Reverse Biased.
  • The Junction Collector-Base is Reverse Biased.
  • No Collector Current [ Ic ] flows, i.e [ Ic=0 ].
  • This condition of transistor is act as a 'Fully-OFF ' and this is 'Cut-Off Region'.
  • Collector to Emitter Voltage [ VCE ] is approximately equal to Supply Voltage [ VCC ] [ VCE = VCC ]

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