I'm using the FDC637 in several of my projects. RDSon (max) is 0.032=20 Ohms for 2.5V gate drive; 0.024 Ohms for 4.5V gate drive. dwayne At 11:38 AM 3/16/2017, Josh Koffman wrote: >Hi all, > >Time for a new dimmer project! Actually, this is to dim an Ikea Jansjo >LED lamp for reading. They're a great product, but can be a bit bright >for beside reading. > >I'd like to make a simple PIC controlled dimmer for them. Should be a >fun project. But...most of my dimmers work at 12V or higher. So now >I'd like to find a MOSFET to use when dimming 3.3V to 5V loads. These >will be smallish loads, no more than 1A. I'm hoping to find an SOT23 >package for compact size. > >In the past I've used the Vishay Si2318DS, so I have some of those in >stock already. Datasheet here: >http://www.vishay.com/docs/72322/72322.pdf . What I'm having trouble >figuring out is whether 3V will be enough gate drive. I recognize that >at low voltage levels the Rds will be higher. I would prefer to not >use a separate gate driver if possile, again because of size. > >So, does anyone have an parts suggestions? I'm happy to look to >different parts, I'm just not 100% sure what the most important >electrical characteristic is, so if anyone have experience I'd love to >hear about it. > >Thanks! > >Josh >-- >A common mistake that people make when trying to design something >completely foolproof is to underestimate the ingenuity of complete >fools. > -Douglas Adams >-- >http://www.piclist.com/techref/piclist PIC/SX FAQ & list archive >View/change your membership options at >http://mailman.mit.edu/mailman/listinfo/piclist --=20 Dwayne Reid Trinity Electronics Systems Ltd Edmonton, AB, CANADA 780-489-3199 voice 780-487-6397 fax 888-489-3199 Toll Free www.trinity-electronics.com Custom Electronics Design and Manufacturing --=20 http://www.piclist.com/techref/piclist PIC/SX FAQ & list archive View/change your membership options at http://mailman.mit.edu/mailman/listinfo/piclist .