Which Transistor in this list is simplest for learn the biasing and use as a switch?

rozeh · Dec 3, 2013

Hello everybody

In this list, which transistor is simplest for learn the biasing and learn to use of a transistor as a switch?

C945
BC327
MJE13001
2N2222
2SC1815
BC547
A733
BC547
BC556
2N5401
2N5551
2SA1015
2SC8550
BC307
BC337

I'm a beginner and I want to learn all thing about a transistor.;-)

spudboy488 · Dec 3, 2013

The 2N2222 has been around forever and can be considered something of a "standard". Really, any general purpose transistor is a good starting point as long as you have a decent data sheet to get all the parameters you'll need for your calculations.

crutschow · Dec 3, 2013

I expect they are all about equally "simple" to learn. It just depends upon what current and voltage you want to switch.

rozeh · Dec 4, 2013

Thanks guys,
Well when I saw in alldatasheet.com(for 2N2222) for seeing the datasheet. the 2n2222 transistor has many type. what's the difference between these types:

NPN switching transistors
HIGH-SPEED SWITCHES
Chip Type 2C2222A Geometry 0400 Polarity NPN
NPN Silicon Planar Transistors
NPN Small Signal General Purpose Amplifiers
and so on...

Which is suitable for learning? Why does it has many types?

crutschow said:
I expect they are all about equally "simple" to learn. It just depends upon what current and voltage you want to switch.

0-5volt

godfreyl · Dec 4, 2013

rozeh said:
the 2n2222 transistor has many type. what's the difference between these types:

Those aren't different types of 2N2222. They're just different descriptions of the 2N2222 and it's uses.
For example:

A 2N2222 can be used for switching.
A 2N2222 can be used for high speed switching.

A 2N2222 can be used for small signal amplification.
A 2N2222 can be used for general purpose amplification.

A 2N2222 is an NPN silicon transistor.
A 2N2222 is a silicon planar epitaxial transistor.

crutschow · Dec 4, 2013

rozeh said:
.....................................

Originally Posted by crutschow
I expect they are all about equally "simple" to learn. It just depends upon what current and voltage you want to switch.

Click to expand...

0-5volt

You answered half my question. ;-)

Zanderist · Dec 4, 2013

I would say the 2N3904 its not on your list but if talking about it for the purpose of learn I'd go for something that is going to be cheap to replace if say it burns out.

rozeh · Dec 4, 2013

godfreyl said:
Those aren't different types of 2N2222. They're just different descriptions of the 2N2222 and it's uses.
For example:

A 2N2222 can be used for switching.
A 2N2222 can be used for high speed switching.

A 2N2222 can be used for small signal amplification.
A 2N2222 can be used for general purpose amplification.

A 2N2222 is an NPN silicon transistor.
A 2N2222 is a silicon planar epitaxial transistor.

but if you see the datasheets of those types, you'd know that they mentioned those titles in it's datasheets.:roll:

crutschow said:
You answered half my question. ;-)

Oh, sorry
For a simple battery. I think 1.5A is suitable.:wink:

crutschow · Dec 4, 2013

rozeh said:
but if you see the datasheets of those types, you'd know that they mentioned those titles in it's datasheets.:roll:

Yes, but they are all describing the same transistor.

Oh, sorry
For a simple battery. I think 1.5A is suitable.:wink:

The you need to look through your list for a transistor that has a voltage rate of at least 7V and a current rating of at least 2A. The 2N2222, for example, is only good for a maximum of 800mA.

Actually for switching that amount of current a MOSFET may be a better choice since they require no steady-stage gate current to turn ON. A BJT requires the base current be about 10% of the collector current to be fully ON.

rozeh · Dec 4, 2013

crutschow said:
Yes, but they are all describing the same transistor.

Ok

crutschow said:
The you need to look through your list for a transistor that has a voltage rate of at least 7V and a current rating of at least 2A. The 2N2222, for example, is only good for a maximum of 800mA.

Probably I can solve this problem by a voltage divider. What's your opinion?

godfreyl · Dec 4, 2013

rozeh said:
but if you see the datasheets of those types, you'd know that they mentioned those titles in it's datasheets.:roll:

Thanks, I have seen the datasheets.
I you bothered to read more than just the titles, you may start to get the point.

- - - Updated - - -

rozeh said:
Probably I can solve this problem by a voltage divider. What's your opinion?

Nope, that won't work.
If this is just for learning and experimenting, why not just get a cheap low power transistor, and use it within it's limits.

rozeh · Dec 4, 2013

godfreyl said:
Nope, that won't work.
If this is just for learning and experimenting, why not just get a cheap low power transistor, and use it within it's limits.

What is your suggestion for my range?(0-5v and 1.5A)

godfreyl · Dec 4, 2013

My suggestion was to change your range. Instead of trying to switch 1.5A, why not start with 10mA or 100mA? Then you can use an inexpensive transistor.

In post 1, you said you want to learn about biasing and learn about how to use a transistor as a switch, so it sounds like you don't have a particular project in mind.

crutschow · Dec 4, 2013

rozeh said:
What is your suggestion for my range?(0-5v and 1.5A)

Since you state this is for learning, then you should learn to read data sheets and go through your list to find ones that may meet your voltage and current requirements. That's what we would have to do. If you can't read data sheets then you won't get far in learning how to build electronic circuits.

rozeh · Dec 4, 2013

godfreyl said:
My suggestion was to change your range. Instead of trying to switch 1.5A, why not start with 10mA or 100mA? Then you can use an inexpensive transistor.

In post 1, you said you want to learn about biasing and learn about how to use a transistor as a switch, so it sounds like you don't have a particular project in mind.

Yes, but 10-100mA is low. my problem is supply. I would like to supply the transistor by a battry. I thought I can solve the problem of supply by a voltage divider but you said to me that that won't work.:-( How can I solve the problem of supply?

crutschow said:
Since you state this is for learning, then you should learn to read data sheets and go through your list to find ones that may meet your voltage and current requirements. That's what we would have to do. If you can't read data sheets then you won't get far in learning how to build electronic circuits.

Where can I find the full explanation about all thing in a transistor datasheet?

crutschow · Dec 4, 2013

rozeh said:
..................................

Where can I find the full explanation about all thing in a transistor datasheet?

One the articles listed here should help.

godfreyl · Dec 5, 2013

rozeh said:
Yes, but 10-100mA is low.

Exactly! I am suggesting you use low current.

rozeh said:
I would like to supply the transistor by a battry.

If your circuit draws a low current, the battery will last a longer time.
If your circuit draws a high current, the battery will go flat quicker.

rozeh said:
How can I solve the problem of supply?

There is no problem.

Why do you think high current is needed for a battery-powered circuit?

rozeh · Dec 5, 2013

godfreyl said:
Exactly! I am suggesting you use low current.

Then, please suggest me a good transistor for that range that you mentioned.

iimagine · Dec 5, 2013

2n3904 and 2n2222 are popular transistors, they are cheap and widely available. Many hobbyists design their circuits around these. I suggest you get some of these and assemble some simple LED flasher circuits, to understand and explore how a transistor works.

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