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NPN transistor substitute

Digital_S80

Aug 18, 2023
1
Joined
Aug 18, 2023
Messages
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Hello
i want to replace this transistor

KTN2222S
Collector-Base Voltage 60v
Collector-Emitter Voltage 30v
Emitter-Base Voltage 5v
Collector Current 600ma
Collector Power Dissipation 350mw

with MMBT2222A
Collector-Base Voltage 75v
Collector-Emitter Voltage 40v
Emitter-Base Voltage 6v
Collector Current 600ma
Collector Power Dissipation 250mw

is it suitable?the transistor is used to feed a monitor's led backlight
 

Bluejets

Oct 5, 2014
6,977
Joined
Oct 5, 2014
Messages
6,977
Usual approach is to go higher not lower, in specs.
Then again, it all depends on the application, which is not shown.
Best advise under those conditions, suck it and see....2cent part.
 

kellys_eye

Jun 25, 2010
6,514
Joined
Jun 25, 2010
Messages
6,514
It's only the dissipation that's 'lacking' in those specs but any decent system designer wouldn't be running a transistor close to its limits anyway so you'll probably get away with it.
 

73's de Edd

Aug 21, 2015
3,633
Joined
Aug 21, 2015
Messages
3,633
Sir Digital_S80

You say . . .
the transistor is used to feed a monitor's led back light

I am VERY thoroughly questioning the above's last words.
Since M-U-U U-U U-U U-L T I P L E ---- M-U-U U-U U-U U-L T I P L E---- M-U-U U-U U-U U-L T I P L E . . . . LED's would be used for a LCD displays backlight . . . .and operating at hefty CURRENTS.
Therefore, like hefty powered transistors would be needed for switching power to them.
More likely . . . . . with that KTN ( Korean sourced_) 2222A being initially used, a back light application is NOT being its fare.

HOWEVER . . .if that back light . . .in reality . . . is being the front of monitor power Red or Green on LED indicator and being driven by this transistor, then . . . not to worry . . . it will be consuming a mere 50mw of power, not even tickling that secondary option of a surface mount 2222. That's considering a conservative 20 ma current pull of the LED.
In the presence of the triple foil pads used with the original TO-92 cased transistor versus making the fit of the surface mount version, you might look around all of your electronics surplus /parts chassis and see the possibility of the use of one of these 2222 - TO-18 TO-92 family subs.
Count the grains of sand in . . . . .
Count the acceptable subs in this non critical application . . . . .
REFERENCE


73's de Edd . . . . .


My wife said that if I don't get off my computer and do my honey do's for her, she's going to slam my head on the keyboard . . . . . . . .
but I really think that she's just jok
i. . . . . BLAM. . . . . #fjreoiwjrtwe4to#8rkljreun8 . . . . BLAM. . . . . . 4ny8*4c8y4t58***lym4wthyl . . . . BLAM.
t4mylt4a***. . . . . BLAM. . . . .

.
 
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