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S8050 - NPN Transistor

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S8050 Pin Description

Pin Number

Pin Name

Description

1

Emitter

Current Drains out through emitter

2

Base

Controls the biasing of transistor

3

Collector

Current flows in through collector

 

Features

  • Low Voltage, High Current NPN Transistor
  • Small Signal Transistor
  • Maximum Power: 2 Watts
  • Maximum DC Current Gain (hFE) is 400
  • Continuous Collector current (IC) is 700mA
  • Base- Emitter Voltage (VBE) is 5V
  • Collector-Emitter Voltage (VCE) is 20V
  • Collector-Base Voltage (VCB) is 30V
  • High Used in push-pull configuration doe Class B amplifiers
  • Available in To-92 Package

 

Note: Complete Technical Details can be found at the S8050 datasheet given at the end of this page.

 

Complementary PNP Transistors

S8550

 

Alternative NPN Transistors

S9014, MPSA42, SS8050, BC547, 2N3904, 2N2369, 2N3055, 2N3904, 2N3906

 

S8050 Equivalent Transistors

2N5830, S9013

 

Brief Description on S8050

S8050 is a NPN transistor hence the collector and emitter will be left open (Reverse biased) when the base pin is held at ground and will be closed (Forward biased) when a signal is provided to base pin. It has a maximum gain value of 400; this value determines the amplification capacity of the transistor normally S8050. Since it is very high it is normally used for amplification purposes. However at a normal operating collector current the typical value of gain will be 110. The maximum amount of current that could flow through the Collector pin is 700mA, hence we cannot drive loads that consume more than 700mA using this transistor. To bias a transistor we have to supply current to base pin, this current (IB) should be limited to 5mA.

When this transistor is fully biased then it can allow a maximum of 700mA to flow across the collector and emitter. This stage is called Saturation Region and the typical voltage allowed across the Collector-Emitter (V­CE) or Collector-Base (VCB) could be 20V and 30V respectively. When base current is removed the transistor becomes fully off, this stage is called as the Cut-off Region.

 

S8050 in Push-Pull Configuration

As mentioned in the features the S8050 transistor is commonly used in push pull configuration with Class B amplifier. So let us discuss how that is done.

A push pull amplifier, commonly known as Class B amplifier is type of multistage amplifier commonly used for audio amplification of loudspeakers. It is very simple to construct and requires two identical complimentary transistors operate. By complimentary it means that we need a NPN transistor and its equivalent PNP transistor. Like here the NPN transistor will be S8050 and its equivalent PNP transistor will be S8550. A simple circuit diagram of the Class B amplifier with the using the S8050 is shown below.

S8050 Transistor Circuit Diagram

 

Applications

  • Audio Amplification Circuits
  • Class B Amplifiers
  • Push pull Transistors
  • Circuits where high gain is required
  • Low signal applications

 

2D model of the component

If you are designing a PCB or Perf board with this component then the following picture from the S8050 transistor Datasheet will be useful to know its package type and dimensions.

S8050 Transistor Dimensions

Component Datasheet

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