Equivalent PNP-transistor

[Boncuk]

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]

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]

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]

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

 

[Boncuk]

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 **broken link removed**.

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

Hans

 

[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.

 

[Nigel Goodwin]

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]

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]

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