Electronics > Beginners
SMD Inductor Soldering Tips wanted
laus:
I had these little boards to solder. The inductors were a pain since the soldering pads on them are on the bottom side. On top of that, the PCB didn't allow for any exposed pads on it either. Capacitors were easy, The PCB had extra large pads for them and the component has the pads on all sides as well.
Are there any tips to solder these inductors with an iron or do I need to invest into a hot air gun for that kind of work? Package size of these are 1008 (2520 metric).
cur8xgo:
pads look like they are on the bottom and a little bit on the side
regardless
put a bump of solder on ONE of the pads
clean tip very well
tweezer on inductor hold onto pads
broadside tip onto pad that has bump of solder, once it flows drag tip along joint until its free
on other pad, put a small blob of solder onto tip then immediately touch to pad/pin joint
feed small amount of solder into that joint if needed
EDIT: looks like your joint on those other parts are pretty cold lumpy. practice your broadside on them so they are smooth and shiny
"broadside drag" that is
EDIT2: As a separate strategy: could pre-blob solder onto the inductor pins and then hold them down onto the pads and broad side each to flow..but I wouldnt do this unless you had no choice
thinkfat:
A hot air station is not an investment, it's a 50 bucks delivered on Amazon. Do yourself a favor and get one.
Gesendet von meinem Nokia 6.1 mit Tapatalk
T3sl4co1l:
Pretty general advice should pay off I think.
In addition to the above:
Use flux liberally. Practice with leaded solder if possible (the lower melting point and viscosity help greatly).
After tinning one pad, position the part with tweezers, and solder that pad. This way the part sits flat on the board, you can center it perfectly over its footprint, and complete one solder joint. Move to the other side and solder that.
If you're doing the PCB design as well, prefer longer pads -- more open soldering area means more contact for the iron's tip. This is less important on side-metallized parts (most chip R/L/Cs), but bottom-metallized parts like this (and a lot of LEDs, and some diodes) absolutely require it -- else you need a hot-air machine.
Also, get a soldering iron tip that's wedge shaped rather than rounded or conical. The larger radius rounded tips won't even reach smaller pads!
If you're doing a lot of SMT, seriously consider a hot air machine. The cheap ones are quite affordable (if sketchy as hell to operate*..), and being able to shove around parts without having to poke an iron at it, without wasting solder, and without burning anything, is so much better. (By all means, do get good with the soldering iron first, though!)
*Thin wiring, poor grounding -- safety stuff like that. Expect it to burst into flames at any time, and plan accordingly. :P
Tim
laus:
--- Quote from: cur8xgo on June 15, 2019, 09:55:46 pm ---put a bump of solder on ONE of the pads
clean tip very well
tweezer on inductor hold onto pads
broadside tip onto pad that has bump of solder, once it flows drag tip along joint until its free
on other pad, put a small blob of solder onto tip then immediately touch to pad/pin joint
feed small amount of solder into that joint if needed
--- End quote ---
That's what I tried to do first. That solders the inductor nicely to the first pad. But the second pad is totally covered. The soldering iron tip now has no chance to touch and head up the second pad. I could't get heat and solder onto it, even with flux pre-applied to the pads.
--- Quote ---EDIT: looks like your joint on those other parts are pretty cold lumpy. practice your broadside on them so they are smooth and shiny
"broadside drag" that is
--- End quote ---
The first one (top center R100) I messed to long with it and melted the top cover. That's why I was afraid applying heat for to long. I've been using 650 degrees Fahrenheit, pre-soldered both pads, and put them kind of angled on there so I could touch some of the soldering location.
I'm now thinking of getting a hot air station, heat the inductors and move them into place. In my head it sounds easy and looks much nicer. I don't have a clue if the reality plays out like that.
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