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Introduction to tip42c, tip42c pinout, tip42c power ratings, tip42c applications
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Introduction to TIP42C

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Introduction to tip42c, tip42c pinout, tip42c power ratings, tip42c applications
Hi Friends! I welcome you on board. Happy to see you around. In this post, I’ll detail the Introduction to Tip42c. Tip42c is a medium power transistor mainly used for amplification and switching purpose. It is made up of silicon material and falls under the category of PNP transistors. The voltage across collector and emitter terminals is 100V and the voltage across base and collector terminals is 100V. The 5V is the voltage across base and emitter terminals which projects the value of voltage required to bias this transistor. The 6A is collector current which indicates the value of loads this transistor can support. Just bear with me for a little while as I’ll be documenting the main features, pinout, applications, and datasheet of this tiny component Tip42c.

Introduction to TIP42C

  • Tip42c is a PNP medium power bipolar transistor mainly used for switching and amplification purpose.
  • It is composed of silicon material and comes in the TO-220 package.
  • It comes with three pins called the emitter, base, and collector. These pins are also known as transistor terminals that are connected with the external electrical circuit.
  • The small input current across one pair of terminals is used to generate large output current across other pairs of terminals.
  • Tip42c contains three layers where two are p-doped silicon layers and one is an n-doped silicon layer. The n-doped layer represents the base terminal where negative voltage is applied to start the transistor action. The two p-doped layers surround the n-doped layer.
Introduction to tip42c, tip42c pinout, tip42c power ratings, tip42c applications
  • As this bipolar transistor controls the small current to produce large current, the reason bipolar transistors are considered as a current-controlled device in contrast to FETs(field effect transistor) which is a unipolar transistor (conductivity happens due to one charge carrier) that are voltage-controlled devices.
  • Two current-gains are important while studying bipolar transistors. One is a common-emitter current gain which ranges from 15 to 75 in this case and common-base current gain which is a ratio between collector current to emitter current, this is normally called alpha.
Its value is always less than 1, commonly lies from 0.90 to 0.95 but more often than not its value is taken as unity.  

TIP42C Features

The following are the main features of device Tip42c
  • Name: TIP42C
  • Package: TO220
  • Material used: Silicon
  • Type: PNP
  • Power Dissipation: 65 W
  • Collector-Base Voltage = Vcb: 100 V
  • Collector-Emitter Voltage = Vce: 100 V
  • Emitter-Base Voltage = Veb: 5 V
  • Collector Current = Ic : 6 A
  • Operating Junction Temperature = Ti:  -65 to 150 °C
  • Transition Frequency = ft: 3 MHz
  • Common-emitter current gain = hfe: 15 to 75
These are the main features and the power ratings of the transistor Tip42c. Don't apply these ratings for more than the desired time, else they will influence the device reliability.
  • The Tip42c is a bipolar transistor which means two charge carriers are used for the conduction process inside the transistor. Both electrons and holes are used for the conductivity, however, holes are the majority carriers and electrons are the minority carriers. Which is the opposite in the case of NPN transistor where electrons are the majority carriers and holes are minority carriers.
  • This PNP transistor comes in TO-220 package with collector current 6A which demonstrates it can support the loads under 6A.
Introduction to tip42c, tip42c pinout, tip42c power ratings, tip42c applications
  • The junction temperature ranges from -65 to 150C and the transition frequency is 3MHz which is a measure of the transistor’s high frequency operating characteristics. It is denoted by ft.
  • The common-emitter current gain stands from 15 to 75 which is the capacity of the transistor it can amplify the small input current. It is called beta and is a ratio between output collector current to input base current.
  • And the only 5V is required to start the transistor action because 5V is the voltage across emitter and base terminals.
  • It is important to note that this PNP transistor is not preferred over its counterpart NPN transistor because the mobility of electrons in the NPN transistors is quicker and better than the mobility of holes inside the PNP transistor.
  • Moreover, in NPN transistors the current flows from the collector side to the emitter side in contrast to PNP transistors where current moves from the emitter side to the collector side.
  • The 65W is the power dissipation that indicates the energy released when this transistor starts working in the electrical circuit. This varies from transistor to transistor.

TIP42C Pinout

The Tip42c contains three terminals named: 1: Base 2: Collector 3: Emitter The following diagram shows the pinout of the transistor Tip42c.
Introduction to tip42c, tip42c pinout, tip42c power ratings, tip42c applications
  • All these terminals carry different doping concentrations and different working ability. The emitter side is more doped compared to the other two terminals and the collector side is lightly doped. The base side is 10-times more doped than the collector terminals.
  • This bipolar transistor is not symmetrical. This absence of symmetry is due to the different doping concentration of the emitter and collector terminals.
  • In bipolar transistors, the base terminal is responsible for the entire transistor action. When voltage is applied at the base terminal, it gets biased and starts controlling the number of holes in this case of PNP transistors and the number of electrons in the case of NPN transistors.
  • This base terminal acts like a control valve that controls the amount of current. The emitter terminal is highly doped and contains the entire current of the transistor. The emitter current is equal to the sum of the collector current and base current.
 

TIP42C Datasheet

When you’re working with tiny devices like Tip42c, it is wise to scan through the datasheet of the component that documents the main characteristics of the transistor. Click the link below and download the datasheet of Tip42c.

TIP42C Applications

The Tips42c is used in the following applications.
  • Used for switching and amplification applications
  • Used in motor control drivers
  • Employed in H-bridge circuits
  • Incorporated in voltage regulator circuits
  • Used to drive loads under 6A
That’s all for today. I hope you find this article helpful. If you’re unsure or have any question, you can pop your query in the section below, I’d love to help you the best way I can. Feel free to leave your valuable suggestions and feedback, they assist us to generate quality content customized to your exact requirements. Thank you for reading the article.
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