Need Assistance: To220 replacement for MJE720 or 2N2219a

[qsa]

Hello


Did somebody know replacement in TO220 case for MJE720 and 2n2219a devices.

MJE 720 is from Central Semiconductor buts its impossibile to get


2SD669a could be a good replacement but its not pin compatible,

This are High Speed devices and used in PA Power Amplifier as VBE


regards

Peter

[ostripper]

MJE 720 is from Central Semiconductor buts its impossibile to get

Original-
http://parts.usbid.com/MJE720.html
modern-
same as BD135/137/139G (Hfe 40 1.5A 40-80V)


2n2219 (in a can)

https://www.littlediode.com/componen...ransistor.html
(10pf cob /50v/gain of 50)
This one isn't too fast either , even a 2n2222 (common) is
faster.. are these for a old amp?
OS

[mjf]

hallo.
2n2219a available at reichelt.de
ca. 0,3 euro per unit
grüsse.............

[anatech]

Hi Peter,

2SD669a could be a good replacement but its not pin compatible,

Okay, so rotate the part so the leads line up.

The 2N2219 was a fast little thing, so if you can get by with a 50 mA device, a 2SC3423 would work well (200 MHz). The 2SC3421 has a transition frequency of 120 MHz, compared to the 2N2219A's 300 MHz rating and the 2SD669A's rating of 140 MHz.

The 2N2219A was a very common transistor, so you should still be able to scare one up somewhere. Many students taking electronics had these in there kits for their course. I imagine there must be thousands of these in closets around the world!

-Chris