Substitute for 2N2222 - Electronic Circuits Projects Diagrams Free

ashfaqueahmadbari · 4th July 2008, 12:04 PM

I have seen many circuits using the 2N2222 transistor (correct me if it isn't one). one of them uses it to control electrical appliances. It says it can be substituted by a BC148. So I just wanted to know can the BC148 be used as a general substitute for 2N2222 or is it just the case in this one?

Here's the schematic

http://www.electronic-circuits-diagr...rsimages/1.gif

Any help would be appreciated.

Thanks in advance

ericgibbs · 4th July 2008, 12:43 PM

Quote:

Originally Posted by ashfaqueahmadbari

I have seen many circuits using the 2N2222 transistor (correct me if it isn't one). one of them uses it to control electrical appliances. It says it can be substituted by a BC148. So I just wanted to know can the BC148 be used as a general substitute for 2N2222 or is it just the case in this one?

Here's the schematic

http://www.electronic-circuits-diagr...rsimages/1.gif

Any help would be appreciated.

Thanks in advance

hi,
You can get both datasheets from DatasheetArchive :: Free Datasheet Search Engine :: Electronic Components
and compare the specification.

Check the Ic's max rating, 100mA BC148 and 600mA for the 2N2222

Boncuk · 4th July 2008, 01:10 PM

The 2N2222 can be replaced without problems by the BC337. The 2N2222 has a TO18A package (similar to TO92, but metal can) and the BC337 has a TO92 package. That one can handle up to 800mA.

mvs sarma · 4th July 2008, 02:21 PM

@ashfaqueahmadbari

You may use 2N3904

audioguru · 4th July 2008, 11:57 PM

The BC148 was used 44 years ago. I have some. It has discontinued about 34 years ago.
The latest one is the BC548 in a TO-92 case.
The 2N3904 is the same but its collector and emitter are reversed.
Use a 2N4401 if you want the same high output current of an old 2N2222.

gramo · 6th July 2008, 11:28 AM

Im a big fan of the 2N4401!

Also, just incase your ever wondering, the 2N4403 is a good pnp solution with similar specs

mneary · 7th July 2008, 02:29 AM

Quote:

You may use 2N3904

In the OP's circuit this is true because it only needs to pass 60 mA. However the 2N3904 is not a universal replacement for 2N2222 because of a lower current rating.

**Krumlink** · 7th July 2008, 03:14 AM

If you need to drive lots of current, use a ZTX649, but I would not reccomend it as it is very expensive.

Hero999 · 7th July 2008, 09:18 AM

Quote:

Originally Posted by mneary

In the OP's circuit this is true because it only needs to pass 60 mA. However the 2N3904 is not a universal replacement for 2N2222 because of a lower current rating.

It also has a slightly lower GBWP but this isn't important here.

Gayan Soyza · 7th July 2008, 09:28 AM

I wonder where you live? If you cannot find 2N series there then you never cannot find a BC148 series out there.

The BC148 is very old as Audio mentioned but 2N series is commonly available.

**Nigel Goodwin** · 7th July 2008, 02:05 PM

Quote:

Originally Posted by Gayan Soyza

I wonder where you live? If you cannot find 2N series there then you never cannot find a BC148 series out there.

The BC148 is very old as Audio mentioned but 2N series is commonly available.

They may be commonly available where you are, but BC series transistors are commonly available in Europe, which is where they come from - far easier than non-European 2N series.

mvs sarma · 7th July 2008, 06:21 PM

Quote:

Originally Posted by Nigel Goodwin

They may be commonly available where you are, but BC series transistors are commonly available in Europe, which is where they come from - far easier than non-European 2N series.

BC 148/158 were also manufactured in India and now a days, we get BC547/BC557 and BC548/BC558- in local make as well as Philips, in TO92 case.
the 2N2222 and likes are also made In India and from Taiwan.
Industrial usage, they prefer metal can and for commercial, TO92.

Gayan Soyza · 8th July 2008, 04:12 AM

Nothing to worry where the transistors came from.Job,price & availability is more important.

2N series more common than some BC series (BC148) including OP has "seen many circuits using the 2N2222 transistor"

ashfaqueahmadbari · 18th July 2008, 12:52 PM

Quote:

Originally Posted by ericgibbs

hi,
You can get both datasheets from DatasheetArchive :: Free Datasheet Search Engine :: Electronic Components
and compare the specification.

Check the Ic's max rating, 100mA BC148 and 600mA for the 2N2222

That's not an IC, it's an opto-coupler. Just thought i'd let you know.

Boncuk · 18th July 2008, 10:19 PM

Quote:

Originally Posted by ashfaqueahmadbari

That's not an IC, it's an opto-coupler. Just thought i'd let you know.

It's a transistor!

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4th July 2008, 12:04 PM	(permalink)
ashfaqueahmadbari	Substitute for 2N2222 I have seen many circuits using the 2N2222 transistor (correct me if it isn't one). one of them uses it to control electrical appliances. It says it can be substituted by a BC148. So I just wanted to know can the BC148 be used as a general substitute for 2N2222 or is it just the case in this one? Here's the schematic http://www.electronic-circuits-diagr...rsimages/1.gif Any help would be appreciated. Thanks in advance __________________ Help me enlarge my army, Click Here!

4th July 2008, 01:10 PM	(permalink)
Boncuk	The 2N2222 can be replaced without problems by the BC337. The 2N2222 has a TO18A package (similar to TO92, but metal can) and the BC337 has a TO92 package. That one can handle up to 800mA.

4th July 2008, 02:21 PM	(permalink)
mvs sarma	@ashfaqueahmadbari You may use 2N3904 __________________ Regards, Sarma.

4th July 2008, 11:57 PM	(permalink)
audioguru	The BC148 was used 44 years ago. I have some. It has discontinued about 34 years ago. The latest one is the BC548 in a TO-92 case. The 2N3904 is the same but its collector and emitter are reversed. Use a 2N4401 if you want the same high output current of an old 2N2222. __________________ Uncle $crooge

6th July 2008, 11:28 AM	(permalink)
gramo	Im a big fan of the 2N4401! Also, just incase your ever wondering, the 2N4403 is a good pnp solution with similar specs __________________ Spency. PIC Micro's - Your mind is the limit PIC's and interfacing with other devices - a PIC Basic Guide @ digital-diy.net

7th July 2008, 03:14 AM	(permalink)
Krumlink	If you need to drive lots of current, use a ZTX649, but I would not reccomend it as it is very expensive. __________________ MechTronics World of Warcraft is a disease

7th July 2008, 09:28 AM	(permalink)
Gayan Soyza	I wonder where you live? If you cannot find 2N series there then you never cannot find a BC148 series out there. The BC148 is very old as Audio mentioned but 2N series is commonly available. __________________ Gayan My Website http://gsmicro.blogspot.com/ Last edited by Gayan Soyza; 7th July 2008 at 09:29 AM.

8th July 2008, 04:12 AM	(permalink)
Gayan Soyza	Nothing to worry where the transistors came from.Job,price & availability is more important. 2N series more common than some BC series (BC148) including OP has "seen many circuits using the 2N2222 transistor" __________________ Gayan My Website http://gsmicro.blogspot.com/