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
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
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/components/2N2219_Transistor.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
Hi Peter,
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
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
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