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[email protected] ggherold@gmail.com is offline
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Default mosfet replacement for tip120?

On Wednesday, September 13, 2017 at 8:29:21 PM UTC-4, Jeff Liebermann wrote:
On Wed, 13 Sep 2017 08:33:57 -0700 (PDT), wrote:

im working on a arcade game board . the tip 120 for an eject soleniod is driven right off the processor leg, no pre -driver transistor. didnt even think that was possible, maybe that why it blew. is there a mosfet i can replace the tip120 with?
thanks


I don't like using darlingtons for power drivers. A momentary shorted
load, and the darlington blows up from too much current. This article
should provide some detail:
http://www.sensitiveresearch.com/elec/DoNotTIP/index.html
I can't offer any specific recommendations without some clue as to the
processor output voltage and current capabilities, the solenoid specs,
and the operating voltage.


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Jeff Liebermann

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I use a TIP120 in a lamp heater (Rubidium lamp). It's nailed
right to the lamp housing (besides a power resistor that shares the work.)
Works great. It must be a fairly robust piece of silicon, 'cause I've used it to raise the lamp temperature to 150 C and let it run for days like that.
(typical operation temp is 120 C.. for years.)

George H.