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Diptrace pcb design4/13/2023 ![]() ![]() If you do need to make a new footprint you shouldn't be working from the chip's dimensions, but from the provided recommended footprint or "landing pattern" in the data sheet. ![]() In this case the -5 refers to a 5-pin version of the SOT23, which would be a 2mm small outline transistor with 5 pins, which by the above numbering scheme should be SOT25.Ĭhances are you will have a generic SOT23-5 or SOT25 footprint in Diptrace since it is one of the most common size of surface mount transistors / small devices around. ![]() The SOT23-5 is actually an incorrect designation, and should really be SOT25, though SOT23-5 is commonly used. The "3" portion refers to the number of pins on the package, so an SOT23 is a 2mm small outline transistor with 3 pins. The "SOT" is a "Small Outline Transistor", with 2mm distance between outer pins on one edge. ![]()
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