I removed the old chip and cleaned up the area with wick and methyl hydrate.. now I need to solder in the new chip. It's a voltage regulator for my Motu 828mk2.
It has a metal tab underneath though that solders to a little heatsink under it. How do I correctly go about installing this? Tin both sides where the heatsink and contact point on the chip meet then attach and heat up the tab til the solder melts between them and bonds? Any caution needed with amount of solder used?
+1 to what Dan says. Only thing I would add is with a surface mount part like this, some no-clean paste flux makes everything easier. DO NOT pre-tin the part, as SMD is always easier if the parts fit flush to the board prior to soldering. No thermal compound is required as the tab is making a direct thermal connection to the board through being soldered to it. You should be able to find all sorts of SMD soldering tutorials on-line.
tinning the part shouldn't be a bad idea. it will also warm it up.
Absolutely the worst thing you can do..no need,
The reflow flux paste is an *absolute* for good smd replacement.
As Ike has already stated.
Only "bolted or screwed" power devices need a thermal paste (with insulate,and/or silicone gasket)...
Smd power devices have the tag soldered to the pcb pad for heatsinking as per design.
I only ever solder once in a blue moon so I don't have solder paste or flux unfortunately. It's just one little chip though so hoping I can get the job done with just an iron and your typical rosin core solder.
Well, I needed to get this dealt with and wasn't into taking more downtime so I made it happen with what I have.
I put solder on the underside of the chip where it connects with the heatsink and some on the tab as well.. making sure it was all connected.. hoping that when I went to bond the chip to heatsink I could heat the tab to melt the solder straight through to the inaccessible center part. Seems to have worked like a charm. I checked the test point and am getting a steady 3.285v for this 3.3v tp which is good yes?
Also, just to check.. When you have chips marked LM1117DT or LM1117DTX they are both the same chip right? The last part is just for type of distribution packaging for ordering purposes?