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For a simple regulator you don't need this insulating plate providing you make sure the heatsink doesn't touch parts of the circuit that are not at 0v (centre pin on most regulators) …

As for inside the heatsink or outside the heatsink, personally I don't think it matters. …

I think if you used an up-to-date spec you'll see the above in red - this spec has stuff about RoHS compliance and the device being lead-free so it's probably more recent than the one in the OP link …

The first option is use big solder copper pads and the 2nd option is to mount a heatsink and, as Charles as pointed out that will be on the non-written side of the device. … And this is on page 1 of the data sheet: - This information allows you to calculate how big a heatsink you need for such and such a power dissipation. …

Your heatsink then solders to that same copper pad on the PCB. … This picture (from the question) isn't the intention of the heatsink manufacturer: - Recap The IC's TO-263 footprint (as specified in the heatsink data sheet) has a thermal pad like so: - That thermal …

Make a pyrometer using an infra red photodiode pointed at the heatsink - use its output to determine heatsink temperature. …

So, estimate how much capacitance 5x T0220 bodies have when bolted down to a large large heatsink via insulators. Is this a problem? No. …

If you are using a heatsink the most important figure is \$R_{th(j-c)}\$ and that value is about 2 degC per watt. … So if ambient around heatsink is (25 + 20) degC then the device's junction temperature will rise to 77 degC. …

Wikipedia says: - When a TO-220 package is used without a heatsink, the package acts as its own heatsink, and the heatsink-to-ambient thermal resistance in air for a TO-220 package is approximately … This means that without an external heatsink, the T0-220 heatsink will rise 70 °C for each watt dissipated. Can I get away with a large enough copper plane? …

So, you need to know things about the heatsink that cannot be necessarily determined by vision alone. … Heatsink and component orientation will matter. …

One thing is worth considering and I think this is quite important. Here's the story: - An IP69 product that was shipped to China for taking measurements of metal contaminants on a food line. It was …

If you are insulating then connecting the heatsink to gnd may add to much capacitance to the circuit that's on the tab. I'm thinking of the drain of a switching FET running at MHz as an example. …

Does a larger thermal resistance value indicate it will dissipate more or less heat? The source of the heat is the transistor (e.g.) that is attached to the heat-sink. That heat originates from the …

I did this once: - Use a strap of sturdy metal to push the transistors down onto the base of the heatsink. You'll need to drill holes in the sides of the heatsink to hold the strap in place. … Transistors and PCB can be removed from the heatsink by undoing screws holding strap. …

The “junction to ambient” thermal resistance is equivalent to a resistance parallel to the “junction to solder” thermal resistance and, that parallel resistance is usually much greater than the “junct …