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Home Knowledge Base

What is BSS84 MOSFET : Pin Configuration & Its Working

Mrinali Sharma by Mrinali Sharma
August 26, 2022
in Knowledge Base
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  • BSS84 is P-Channel Enhancement Mode MOSFET (Metal Oxide Semiconductor Field Effect Transistor) and is used as a high-speed switching device in applications. The device is designed using ON Semiconductor’s proprietary, high cell density, DMOS technology.
BSS84 MOSFET

Pin Configuration

BSS84 is a three-pin device as shown in the figure and the function of each of those pins is stated below.

Pin Name Function
1 Drain Current which comes into the device through the Source pin goes out through the Drain pin.
2 Gate MOSFET gets turned ON and OFF depending on the voltage applied to gate.
3 Source Current comes into the device from the Source pin.

Working

  • When the -5V gate signal is given through the microcontroller at a set time, then MOSFET will start performing.
  • The current supplies throughout the transistor & this current flow can lead to a drop in voltage beyond load. This voltage drop will switch ON the load.
  • The load used in the circuit is the motor which will rotate continuously until the microcontroller negative voltage is there & the direct voltage like ‘Vo’ will go to 0V to stop the motor from rotating.
  • Thus, BSS84 is used as a switching device in the above application & in a similar method, we can utilize the transistor in other different circuits.

Applications of BSS84 MOSFET

  • Functions of Power Management.
  • Line Current Interrupter within Telephone Sets.
  • Liner Transformer Drivers.
  • Load Switching.
  • Protection of Battery.
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Mrinali Sharma

Mrinali Sharma

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