Electrical Engineering Stack Exchange
Electrical Engineering Stack Exchange

Questions tagged [reflow]

Reflow soldering is a type of soldering where solder paste is applied to the pads, after which the components are placed on top and then it is baked in an oven.

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Why does solder not conduct sometimes?

I was reflowing and a 2K 603 resistor partially tombstoned. There was solder connecting the lead to the pad, yet my DMM showed an open. When I heated both ends and the resistor came down and contacted the pad, the DMM read 2k ohms like it should.…
Bill
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SMT solder reflow temperature profile

I have read many website and forums about DIY reflow ovens for SMT soldering. I have also seen many solder profiles as specified by the solder manufacturers, component manufacturers, and other self-proclaimed experts. I am having trouble…
PICyourBrain
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Can leaded BGA chips be reflow soldered with lead-free process?

We have a board with two BGA chips. Due to the current shortage of many parts, one of the chips is next-to-impossible to find; except that we found a supplier with a good stock of the non-RoHS / leaded version of the chip (which is a discontinued…
Cal-linux
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Why and when to use reflow soldering?

I was looking at an instructable and they suggested using "reflow soldering" for a certain section. "Reflow" wasn't a concept i was familiar with, so I did some Googling... I got a basic description of the process, but I still can't figure out why…
Zak Kus
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Is it safe to repeat reflow soldering?

I have a board that is partially reflow soldered with a QFN and a couple of 0603 capacitors and resistors. I wanted to test functionality with this stage before I go ahead and place the other components whose working depends on this stage working…
user3418620
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Any drawbacks to "low temp" lead-free solder paste?

I am about to try my first "reflow skillet" soldering job, and as I look at the available types of solder paste I see there are lead-free pastes with much lower melting temperatures than others. For example, this one from ChipQuik. The advantages…
Kaelin Colclasure
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DIY BGA soldering feasability

BGA seems to be somewhat of a showstopper for the diy community, especially with the newer more powerful parts being almost exclusively bga. I know it can be done with the skillet/toaster oven method, but it seems like there is no way of inspecting…
stbtra
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Soldering heatsink pad on bottom of IC

I am attempting to make a board for the tlc5951 24-channel led driver to drive an 8x8 rgb led array. I have made what I think is a good eagle library for the sop-38 package, but I am not sure what to do about the pad on the underside of the ic. The…
captncraig
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Do electrolytic capacitors lose lifetime during soldering in reflow oven?

Electrolytic capacitors service time is based on maximum operating temperature, among other things. When they are inside an SMD soldering oven, the temperature increases to over 375°C. Most of the capacitors are rated at 105°C. Although there is no…
Sadat Rafi
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Will "hot plate" reflow soldering work without a solder resist coating?

With a successful through-hole design under my belt I am now ready to try fabricating a board that uses surface-mount components. I have been reading about this, and have gathered that the DIY crowd has gotten reasonable results with "hot plate"…
Kaelin Colclasure
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Can you program a surface mount IC with flash memory and then reflow solder them?

I know that many chips, such as the ATMEGA328P-AU list flash storage lifetimes at certain temperatures, but they usually cap out at 100° C. I know that, ideally, one should include leads on their board to program the chip after soldering, but I…
Gabe S.
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Solder paste not wetting at all

I have an issue with solder paste, I would like to know its origin so I can fix the problem and solder by components properly. I use a lead free Sn42/Bi57.6/Ag0.4 solder paste, manufactured by ChipQuick. Here is the datasheet. The syringe I'm using…
MaximGi
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How do components not get knocked off or fall off during reflow?

I am looking at reflow ovens. A lot of them have a metal conveyor belt the boards sit on. On a double sided board, when you put the board on the metal belt, won't the metal belt knock components off as they are only held on by paste? In the case…
SA_A30
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Reflow at home or solder manually?

I'm considering doing DIY SMT Reflow for production of my Super OSD project. An overview of the component count: Resistors: ~50 x 0603; precision 0.1% resistors as well as 1% and 5% components Capacitors: 17 x 0603, 2 x 0805, 1 x 1206 (all…
Thomas O
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Assembly of PCBs containing a mix of SMT and thru-hole parts?

I have a batch of beta PCBs which we have to assemble in our lab. We have an APS manual pick-and-place machine and a tabletop reflow oven so I thought assembly tomorrow would be easy and straight forward until our technician bought up a point. The…
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