Are there any guidance on recommended package size and type for a surface mount linear regulator IC on my board that will be hand-soldered?

I am designing a board that needs a couple linear regulators (5.5v to 3v and 3v to 1.6v) but I am having difficulty selecting a suitable surface mount package type and size that will allow me to hand solder the IC to the PCB without too much difficulty.

My preference for higher power is a DPAK. Second to that is a SOT-223. These both have tabs that will transfer a lot of heat. Unless it is 50mA or less, don’t bother with packages that only attach to the board with pins or legs. These things tend to heat up like crazy. T hey don’t dissipate much power at all.

Ook, don’t forget to give a good copper area on top. Bovendien, you can do a pad on the bottom and attach with several vias, but the one on the component side will be most important.

For hand soldering packages like this with significant thermal mass, nothing beats a hot-air gun. A metcal with a big spade tip is also great, but the hot air gun will save your bacon many times over. They can be had on ebay for $300 or so.

#PCB-assemblage

https://www.youtu.be/kX4gCs9szeA?si=qH55dtWIMFy2Bv31

Picture of Olivier Smit

Olivier Smit

Oliver is een ervaren elektronica-ingenieur met kennis van PCB-ontwerp, analoge circuits, ingebedde systemen, en prototyping. Zijn diepgaande kennis omvat schematisch vastleggen, firmware-codering, simulatie, indeling, testen, en probleemoplossing. Oliver blinkt uit in het omzetten van projecten van concept naar massaproductie met behulp van zijn elektrische ontwerptalenten en mechanische vaardigheden.
Picture of Olivier Smit

Olivier Smit

Oliver is een ervaren elektronica-ingenieur met kennis van PCB-ontwerp, analoge circuits, ingebedde systemen, en prototyping. Zijn diepgaande kennis omvat schematisch vastleggen, firmware-codering, simulatie, indeling, testen, en probleemoplossing. Oliver blinkt uit in het omzetten van projecten van concept naar massaproductie met behulp van zijn elektrische ontwerptalenten en mechanische vaardigheden.

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What are the black spots in lead-free solder joints on PCB?

I am prototyping a PCB, using Chip Quik’sSMDSWLF.031, a Sn96.5/ Ag3.0/ Cu0.5 solder with 2.2% no-clean flux. I find that the black spots appears frequently in larger pads on my board. I wonder if it is because I left the soldering iron more time heating the solder and that burnt the flux. What is that black residue? Is that a sign of a bad joint or maybe bad soldering technique?

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