Equivalent PNP-transistor - Electronic Circuits Projects Diagrams Free

Boncuk · 1st May 2008, 03:11 AM

Hi All,

I am looking for the equivalent of a TOSHIBA-PNP transistor RN2221 with built in bias resistors.

The package is TO92. The RN2221 has two 1KOhm resistors built in.

Any info?

Thank you.

Hans

**Nigel Goodwin** · 1st May 2008, 10:25 AM

They are normally called 'digital transistors', all you need is a PNP digital transistor - type doesn't really matter, it's just a switch.

Boncuk · 1st May 2008, 01:50 PM

Hi Nigel,

may be that applies in English speaking countries. At NXP (Philips) they just call them "resistor equipped bipolar transistors".

However I found a suitable substitute for the RN2221. The type name is PDTB113E (package SOT54, similar to TO92), just in case somebody else wants to save parts on a PCB.

Hans

mneary · 1st May 2008, 11:31 PM

If you shop at http://www.ROHM.co.jp you would be looking for digital transistors.

Boncuk · 2nd May 2008, 10:48 PM

Quote:

Originally Posted by mneary

If you shop at http://www.ROHM.co.jp you would be looking for digital transistors.

Hi mneary,

thanks for the hint. Without detour the site's name is http://www.rohm.com. For Europe it is http://www.rohmeurope.com.

I signed up yesterday night and waiting for approval. (club card

)

Hans

Hero999 · 3rd May 2008, 11:21 PM

I'm sure there are lots of them. They're just designed to buffer microcontroller outputs for things like relays.

It'd be handy if you could get them in four pin packages, with a built-in freewheel diode so relays can be switched with no external components.

**Nigel Goodwin** · 4th May 2008, 02:46 PM

Quote:

Originally Posted by Hero999

I'm sure there are lots of them. They're just designed to buffer microcontroller outputs for things like relays.

It'd be handy if you could get them in four pin packages, with a built-in freewheel diode so relays can be switched with no external components.

They are usually far too small for that, they are normally only low signal devices, inverting and switching data - you get them all over TV's, VCR's etc.

Boncuk · 4th May 2008, 03:47 PM

Most of them have a TO-92 package. They are available from 100mA to 800mA collector current, enough to control a relay.

Examples: RN2221 800mA, DTB113E 500mA

to hero999: They are available with free wheeling diodes as arrays of the "ULN"-family.

Hans

mneary · 5th May 2008, 11:51 PM

Rohm makes devices they call "complex transistors", including some with both 100mA digital transistor and freewheeling diode. Look for EML17 and EML20. They are in 5-pin packages, outside dimensions 1.6 x 1.6 mm.

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1st May 2008, 03:11 AM	(permalink)
Boncuk	Equivalent PNP-transistor Hi All, I am looking for the equivalent of a TOSHIBA-PNP transistor RN2221 with built in bias resistors. The package is TO92. The RN2221 has two 1KOhm resistors built in. Any info? Thank you. Hans Last edited by Boncuk; 8th July 2008 at 12:49 AM.

1st May 2008, 10:25 AM	(permalink)
Nigel Goodwin	They are normally called 'digital transistors', all you need is a PNP digital transistor - type doesn't really matter, it's just a switch. __________________ PIC programmer software, and PIC Tutorials at: http://www.winpicprog.co.uk

1st May 2008, 01:50 PM	(permalink)
Boncuk	Hi Nigel, may be that applies in English speaking countries. At NXP (Philips) they just call them "resistor equipped bipolar transistors". However I found a suitable substitute for the RN2221. The type name is PDTB113E (package SOT54, similar to TO92), just in case somebody else wants to save parts on a PCB. Hans

1st May 2008, 11:31 PM	(permalink)
mneary	If you shop at http://www.ROHM.co.jp you would be looking for digital transistors.

3rd May 2008, 11:21 PM	(permalink)
Hero999	I'm sure there are lots of them. They're just designed to buffer microcontroller outputs for things like relays. It'd be handy if you could get them in four pin packages, with a built-in freewheel diode so relays can be switched with no external components. __________________ I also post at the following sites: http://www.stop-microsoft.org http://www.heated-debates.com Screen name: Aloone_Jonez

4th May 2008, 03:47 PM	(permalink)
Boncuk	Most of them have a TO-92 package. They are available from 100mA to 800mA collector current, enough to control a relay. Examples: RN2221 800mA, DTB113E 500mA to hero999: They are available with free wheeling diodes as arrays of the "ULN"-family. Hans Last edited by Boncuk; 4th May 2008 at 03:50 PM.

5th May 2008, 11:51 PM	(permalink)
mneary	Rohm makes devices they call "complex transistors", including some with both 100mA digital transistor and freewheeling diode. Look for EML17 and EML20. They are in 5-pin packages, outside dimensions 1.6 x 1.6 mm.