Hobby Electronics Basics TO-220 pinout standard?

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Subject Author Date
TO-220 pinout standard? mrdarrett 07-02-08
Posted by on July 2, 2008, 12:50 pm
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Is it standard that a TO-220 transistor package is, with the tab up,
with the markings facing you, Base, Collector, Emitter? (for example,
on the TIP31A)

I noticed the TO-92 2N3904 I have is (with the markings facing me) E B
C, and a TO-92 2N2222 data sheet even shows C B E !!!

Michael

Posted by Tom Biasi on July 2, 2008, 1:32 pm
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> Is it standard that a TO-220 transistor package is, with the tab up,
> with the markings facing you, Base, Collector, Emitter? (for example,
> on the TIP31A)
>
> I noticed the TO-92 2N3904 I have is (with the markings facing me) E B
> C, and a TO-92 2N2222 data sheet even shows C B E !!!
>
> Michael

The TO-220 package is used for many devices not just transistors.
The pinout is what the data sheet says it is.
Always consult the data sheet if the leads are not marked.

Tom



Posted by on July 2, 2008, 1:47 pm
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>
>
> > Is it standard that a TO-220 transistor package is, with the tab up,
> > with the markings facing you, Base, Collector, Emitter? (for example,
> > on the TIP31A)
>
> > I noticed the TO-92 2N3904 I have is (with the markings facing me) E B
> > C, and a TO-92 2N2222 data sheet even shows C B E !!!
>
> > Michael
>
> The TO-220 package is used for many devices not just transistors.
> The pinout is what the data sheet says it is.
> Always consult the data sheet if the leads are not marked.
>
> Tom



So does this mean it is NOT standard that a TO-220 *transistor*
package is BCE? (with the markings facing you)

Michael

Posted by Tom Biasi on July 2, 2008, 2:02 pm
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>>
>>
>> > Is it standard that a TO-220 transistor package is, with the tab up,
>> > with the markings facing you, Base, Collector, Emitter? (for example,
>> > on the TIP31A)
>>
>> > I noticed the TO-92 2N3904 I have is (with the markings facing me) E B
>> > C, and a TO-92 2N2222 data sheet even shows C B E !!!
>>
>> > Michael
>>
>> The TO-220 package is used for many devices not just transistors.
>> The pinout is what the data sheet says it is.
>> Always consult the data sheet if the leads are not marked.
>>
>> Tom
>
>
>
> So does this mean it is NOT standard that a TO-220 *transistor*
> package is BCE? (with the markings facing you)
>
> Michael

You will find some that are not that way.

Tom



Posted by on July 2, 2008, 3:03 pm
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>
>
>
>
>
>
> >> > Is it standard that a TO-220 transistor package is, with the tab up,
> >> > with the markings facing you, Base, Collector, Emitter? (for example,
> >> > on the TIP31A)
>
> >> > I noticed the TO-92 2N3904 I have is (with the markings facing me) E B
> >> > C, and a TO-92 2N2222 data sheet even shows C B E !!!
>
> >> > Michael
>
> >> The TO-220 package is used for many devices not just transistors.
> >> The pinout is what the data sheet says it is.
> >> Always consult the data sheet if the leads are not marked.
>
> >> Tom
>
> > So does this mean it is NOT standard that a TO-220 *transistor*
> > package is BCE? (with the markings facing you)
>
> > Michael
>
> You will find some that are not that way.
>
> Tom


Thanks.

Michael

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