Schottky Diode

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RRITESH KAKKAR

Joined Jun 29, 2010
2,829
That IC has two completely-separate components in it.

The Schottky diode has each lead connected to two pins of the IC, probably for higher current-carrying capacity.

What's not to understand? It's a lot like a regular diode, but with a smaller voltage drop. This one should let current flow into IC pins 1 and 2 and out through pins 7 and 8, but NOT in the other direction.

You could probably test it with a multimeter, using the resistance (or "continuity", or "diode") test mode, trying it in both directions. One direction (i.e. pin 7 or 8 positive/red probe and pin 1 or 2 negative/black probe) should have a LOT more resistance than the other direction.

If you have an oscilloscope, you could also test it with the "quick and dirty curve tracer", using a small transformer (or signal generator) and a couple of resistors, like they describe at: http://www.repairfaq.org/REPAIR/F_semitest.html#stqdc .

A simple "continuity" test should also work, in one direction only, assuming it uses a voltage that's above the Schottky's rated forward voltage of 0.51 Volts. A battery and a small lamp or LED circuit would also work, for that test.
so, what about the Mosfet in the ic..?
 

gootee

Joined Apr 24, 2007
447
so, what about the Mosfet in the ic..?
The MOSFET? If it's not been destroyed already, maybe you could put 2.5 V DC from gate to source and then test the resistance between the drain and the source (try both directions). Or, you could wire a small lamp and battery in series with the source-drain pins and then try putting 2.5V or more (not more than 20V) between gate and source, and see if the lamp lights up.
 
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