I would treat the PTC as a very loose-tolerance resistor. Make sure your circuit will work properly if the PTC resistance is anywhere between 1.5 and 10 ohms. It's probably close to 10 ohms soon after tripping or being soldered, and may drift back down toward 1.5 ohms after hours or days at room temperature.
In reference to the part number 1206L010/60 (second one down in top
list), I have a question.
Resistance R (min) = 1.5 ohms
Resistance R (1max) = 10 ohms
R min = Minimum resistance of device in initial (un-soldered) state.
Rtyp = No spec given.
R 1max =? Maximum resistance of device at 20°C measured one hour after
tripping or reflow soldering of 260°C for 20 sec.
Question: If I were to figure in the resistance for the PTC fuse as part
of my equation for selecting the correct resitors further down the
circuit...What number in ohms should I use? In other words, when the
circuit is in normal operation, what will the resistance of the PTC
actually be?
Thanks,
Dave
