My articulating lamp died and I thought I might be able to fix it. I opened the controller and found a PCB with what looks like two output (FET?) transistors on the lamp end. I searched the numbers (AO9T) and found nothing. Is this a legitimate item number? Or, is it some kind of shorthand for a longer number? The 'brain' chip has no number at all that I can see.
The scale is millimeters.
Thanks for looking.
Did you try A09T?
Gaahh! 
I thought I had checked A09T. Apparently I flubbed it somehow.
Thanks! 
Yes it is.
That "TOP" marking is used by several manufacturers. The MOSFETs may have different specificaions
It appears to be an AO3400 that you can get from DigiKey and others.
It's curious, to me, why a search on AO3400 turns up a page which shows A09T as the product.
Referring to @jim-p's post, is it actually a two-part part number?
It’s my understanding that the shorter number is used because it fits better and there is a database somewhere that knows how to cross reference. I’ve seen the cross reference detailed on some TI data sheets, for example,
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