TO-18 Package Type BJT Transistor 2N2222A Switching Reed Relay EDR201A05

2N2222A TO-18 Package Type Transistor

2N2222A Characteristics / Parameters

Component CharacteristicsComponent Parameters
Type Designator2N2222A
Transistor OutlinePackage TypeCASE:  TO-18, TO-92, TO-39
FamilyBJT, NPN
Material of TransistorSilicon
PolarityNPN
Maximum Power Dissipation500mW / 1200mW
Maximum Collector to Base Voltage75V
Maximum Collector to Emitter Voltage50V
Maximum Emitter Base Voltage6V
Maximum Collector Current800mA
Minimum hFE35
Maximum hFE300
FunctionAmplification / Switch
Manufacturers
  1. On Semiconductor
  2. FAIRCHILD Semiconductor
  3. NXP Semiconductors Philips
  4. ST Microelectronics
  5. SEME Lab
  6. SEMICOA Semiconductors
  7. Boca Semiconductor Corp.
  8. Micro Electronics
  9. Microsemi Lawrence
  10. Central Semiconductor Corp.
  11. New Jercy Semiconductor Products Inc.
  12. Comset Semiconductors
  13. CDIL - Continental Device India Ltd.
  14. Multi Comp
  15. Tiger ELectronics Co. 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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