I’m looking to cool a couple of thick film resistors that keep overheating. Can I cool more than one (2) with this heat sink?

I would think so. It depends on how much power they are dissipating and how much airflow is on the heatsinc

Is this anodized? Also what is the alloy?

It's very shiny which might lead one to believe that it has been clear anodized because it doesn't have that dull grey look of raw aluminum that's been left out for a while. I have no clue about the alloy. The packaging says nothing about the finish or the alloy.

Can you make anodized 200 x 138 x 36mm block? Thanks.

Hi 69x36mm HeatsinK, already all silver oxide item surface, you can use two side by side to dissipate heat for electronic products, thank you

What is the thermal resistance of this heat sink in the 400mm version?

Short answer: About 0.4 oC/W/16in (still air). For others who purchased a different length, they will need to adjust this number. From my review below, a more detailed answer: I found a dimensionally-similar (2.581" wide instead of 2.71", 1.340" tall instead of 1.41" tall) heat sink in an online AAvid catalog, model # 83220. The AAvid heatsink specs were 1.01 oC/W/3in (still air), so I'm expecting this heatsink could be 10% better (lower). Note that if you bought a length other than 3", the thermal resistance does not scale linearly with 1/Length, assuming a centrally located thermal point source. For the 15.75" length I'm using, the improvement is only a 50% reduction in thermal resistance. Also note that the thermal resistance decreases (improves) with moving air. While the documentation I found for the #83220 did not provide thermal resistance versus air flow, I found another AAvid catalog and heatsink #72070 (dimensions 3.008" wide, 1.02" tall, similar fin aspect ratio, 1.4 oC/W/3in) that provided a thermal performance versus airflow table; for a modest airflow (quiet muffin fan) of ~700 LFM, the thermal resistance drops by about another 70%. Net result, for the 15.75 inch length option, operating with 700 LFM forced air flow, is expected to be about (1oC/W/3in * 90% * 50% * 30%) = 0.14oC/W. My heat source is distributed along the 15.75" length, rather than being a point source in the center, so I expect the actual performance to be 2-3x better (lower resistance) than the above calculation.

Large Aluminum Heat Sink 2.71"x2.71"x1.41"/ 69x69x36mm Heatsink High Power Cooling Plate 27 Fin Radiator GPU Cooler IC Module PC Computer Led PCB Charger Electronics Amplifier

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