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Do you know what they mean saying solder melting point is 110degC?Heat conducted by the connections (of the resistor) must not reach the melting point of the solder at the joints. Therefore a maximum solder joint temperature of 110 °C is advised.
..thanks Warpspeed, do you think that could happen as low as 110degC though?Its not unheard of to find a piece of equipment has stopped working and to discover a vital resistor completely missing from the circuit board.
Then to discover said resistor rattling around loose inside the case.
The RTH(JA) is 1.5degc/w for that fet , so the pad temperatures wont be much less than 150degC...that si7370 fet is meant to cool via the pcb to bottom layer copper, then heetsink, so the 1.5degc/w applies to the route through its opads to the pcb....The junction may be at 150C, but its unlikely the lead temperatures reach that. The thermal resistance junction to case, and power dissipation should tell you.
on a similar note, these SMT fets claim to be able to operate up to 150degC junction temp, but i surely there solder would go soft at 150degC and they could slide off the pads...
The solder used inside fet's etc is a much higher eutectic, typ 220C, 280C .
if solder "suddenly" melts at 183 degC, or does it go 'soft' (like chewing gum) well before that?...say at 100degC?
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