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Resistance of TO220 resistor leg?

cupoftea

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Hi,
Do you know the resistance of one leg of this TO220 resistor?

TO220 resistor

Depending on what material it is made of (datasheet doesnt say), the resistance coudl be from 46.5uOhms, to 1.91mR ?

mmm
TO220 LEG RESE-Fmmm^2
widththicklengthMAT'LRHOLAREARES
7.80E-04​
5.10E-04​
0.00975​
copper
1.68E-08​
1.38E-02​
4.97E-06​
4.65E-05
7.80E-04​
5.10E-04​
0.00975​
tin
1.09E-07​
1.38E-02​
4.97E-06​
3.01E-04
7.80E-04​
5.10E-04​
0.00975​
GOE steel
4.60E-07​
1.38E-02​
4.97E-06​
1.27E-03
7.80E-04​
5.10E-04​
0.00975​
s steel
6.90E-07​
1.38E-02​
4.97E-06​
1.91E-03

..So i realise the qu is "what is a res leg made of"?
 

KlausST

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Hi,

I defintely expect them to be less than a milliohm.

If you go for high accuracy, low resistance, high current, you also should use short legs and kelvin wiring on the PCB.

Klaus
 

dick_freebird

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I'd expect most of the resistance to be in the bond wire(s),
you could probably figure rough pin material resistance as
dimensional copper with a pair of calipers. Crack a package
and see what the wire bond looks like, for length and diameter,
and there's tables for that.
 

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