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Engineering
Electrical Engineering
Thermal Resistance between Chip to Gold Tin Solder
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[QUOTE="Windadct, post: 5990373, member: 311008"] Well I SHOULD know how to do this off the top of my head, and if you really want to work in a field where this is a relevant issue, then maybe you should also? So - thanks Google: [IMG]https://wikimedia.org/api/rest_v1/media/math/render/svg/76f0a5abbd2a53d4a86005490f2e011668b333ae[/IMG] So a 1 Sq cm die and 1mm thick ( seems to be very thick to me..) and AuSN k = 57 W/ m*C ( I prefer to reference Kelvin in these - but that is for another discussion) ... = 0.001 / (0.01)^2 * 57 = 1/57 A 1 Sq CM Die will have a Rth of 1/57 = 0.0175 C/W... so... 100W -- will have deltaT of 1.75 C rise across the junction... BUT you say "attached"- is the solder actually soldered to BOTH the die and the heatsink? If so then this should be a good number, if not, you have to consider the junctions chip->solder Solder->HS [/QUOTE]
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Thermal Resistance between Chip to Gold Tin Solder
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