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chromatid · 04-25-2008, 08:54 AM

That burned surface-mount component is really a transistor (N-channel FET), even though its package looks like an IC (notice the silkscreened label Q4 rather than U4).

It's identical to Q3, on the other side of coil L1 in the square gray can.

Full markings:

F (Fairchild logo) AG1AN
FDS
6680A

Datasheet at http://www.fairchildsemi.com/ds/FD/FDS6680A.pdf

Since it's really just a 3-terminal device (top 4 pins tied together as Drain, 3 of 4 on the bottom as Source), if you locate a matching FET in some other case, like a TO-220 it should be possible to bend the pins and fit it in.

Of course, there might be something else wrong that caused that FET to blow in the first place... it's part of the +12V buck/boost regulator circuit, if that's any clue.

Good luck!

04-25-2008, 08:54 AM	#3
chromatid Newbie Join Date: Aug 2003 Posts: 6	Fairchild FDS6680A FET That burned surface-mount component is really a transistor (N-channel FET), even though its package looks like an IC (notice the silkscreened label Q4 rather than U4). It's identical to Q3, on the other side of coil L1 in the square gray can. Full markings: F (Fairchild logo) AG1AN FDS 6680A Datasheet at http://www.fairchildsemi.com/ds/FD/FDS6680A.pdf Since it's really just a 3-terminal device (top 4 pins tied together as Drain, 3 of 4 on the bottom as Source), if you locate a matching FET in some other case, like a TO-220 it should be possible to bend the pins and fit it in. Of course, there might be something else wrong that caused that FET to blow in the first place... it's part of the +12V buck/boost regulator circuit, if that's any clue. Good luck! Last edited by chromatid; 04-25-2008 at 01:28 PM.