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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9
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1answer
2k views

Soldering BGA components DIY

If I understood correctly, current BGA components contain solder balls under the package. Do I still need additional solder paste to put on the board, or the amount of solder on the component contacts ...
3
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2answers
2k views

GPU reflow soldering profile

I've had my ENGTX480/2DI/1536MD5 GPU for 3 and half years now. Over the past 2 months it started causing trouble. At first, it started seldom displaying big zones with weird color, but simply ...
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2answers
565 views

Re-reflowing a populated PCB

I've printed, populated and baked a test PCB with most components that I needed. I left off a GPS chip and associated passives because the GPS chip itself costs more than the rest of the board, and I'...
2
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2answers
1k views

Consequences of not following reflow profile

I found many questions about how to perform reflow soldering, but my main concern is What are the consequences of not following the recommended reflow profile. Would there be any risk going the ...
0
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2answers
181 views

Is airbath + air gun reflow appropriate for low-volume commercial production?

I understand there are a number of ways of reflowing individual SMT boards. I've seen small temperature profile ovens, hotplates, skillets, airbaths, and hot air guns used. I'm trying to determine ...
1
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1answer
2k views

Difference between infrared heating tube coatings?

I'm converting a toaster oven to a SMD reflow oven and have found the thermal momentum of the resistive elements to be a problem (standard dark-grey type). So I've been searching online for some ...
1
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1answer
239 views

DIY SMD - options for covering exposed vias?

I printed a PCB + got a kapton stencil made for a project I'm working on. One of the components is a BGA chip, and has vias close to the bga pads. The vias on the board don't have solder mask on them, ...
4
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3answers
1k views

What's a good plastic for self-cutting solder paste stencils on a laser?

I've tried making my own solder paste stencil using 4 mil polyester (for overhead projection slides) on a 45W Epilog laser cutter at the local TechShop maker space. I could not "cut" the stencil ...
4
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1answer
1k views

Are thermal reliefs on SMD pads beneficial when reflow soldering?

I know that thermal reliefs have benefits when hand-soldering through-hole components. For some high-frequency or high-current components, I understand why it's a good idea not to use thermal reliefs....
5
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3answers
836 views

Insulating a via during reflow?

I have a PCB that I'm sending off for assembly, which includes going through a reflow oven. The last batch had a problem because the solder mask on some PCBs does not completely insulate a via that ...
5
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1answer
503 views

Soldering pins underneath a connector

I wish to solder this type of HDMI connector (Datasheet) to matching pads on a PCB: So half the pins are protruding out into the clear, and that row is easy to solder. But just behind that row, as ...
6
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1answer
255 views

Non-wet open solder fault on the same ball of two different devices of the same part?

Sophisticated PCBA, with a DM6446 using two 16 bits DDR2 devices to implement a 32 bit memory space. On some boards, we see a stuck bit on either bit 24 or bit 8, which map to the same BGA ball (C8) ...
0
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1answer
336 views

Reflow oven - resistive heating element or infra-red

I'm looking at making a reflow oven and have just found out the toaster oven I have bought uses a standard conduction heating element rather than infra-red. The knob used for temperature control goes ...
2
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0answers
676 views

Solder paste issues

I am using the smallest sized readily available lead paste I could find (15-25 micron size) and printing using a metal stencil with the smallest pitch being .5mm pitch qfns. Reflow is with a SMTmax ...
3
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5answers
2k views

Why not reflow a PCB before placing parts?

A standard reflow method for low-volume assembly is: Method A Apply solder paste (using stencil or syringe) Hand-place parts (using vacuum pickup pen or tweezers) Oven reflow - But what happens if ...
5
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3answers
19k views

Questions about reflowing solder on a motherboard

One of my laptop's DIMMs is dead and working with less than my usual 8GB of RAM is brutal. Multiple sources suggest reflowing the board. I quite frequently tinker with/hack my electronics, but I've ...
3
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4answers
538 views

Do any SMT components require hand soldering due to heat limitations?

It has been claimed on another board that some SMT components cannot be used in an automated production line (i.e. reflow or wave soldering) because they cannot withstand the heat/temperature. Hand ...
5
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4answers
361 views

Temperature sensor recommendation

I am builing a homemade reflow oven, but I cant find a good and cheap temperature sensor that can survive the temperatures necessary for reflow (~250ºC or 482ºF). Does anyone have a recommendation? I ...
19
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4answers
12k views

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 ...
7
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2answers
2k views

DIY Reflow soldering

This is related to this question. I'm trying to get started with a DIY reflow soldering station intended for my personal use. I'm planning on starting small and improving the system as time goes on (...
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2answers
343 views

Reflow oven AC cable splicing insulation and thermocouple readings

I'm building a reflow oven. I know what I'm doing, I just want to verify my plans to make sure I'm not doing anything stupid before I start. The idea is to have an arduino (powered externally) ...
7
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1answer
1k views

What causes components to “jump” during reflow soldering?

I've been using a hot plate technique (with a PID controller / thermocouple / SSR setup) to get into making SMD boards. I had an interesting experience earlier today, and I was hoping some more ...
6
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2answers
1k views

How well do reflowed connectors self align?

I am thinking of using some Hirose DF40 PCB stacking connectors to stack together a bunch of PCBs. Each pair of PCBs would be connected by two connectors for mechanical stability. These connectors do ...
3
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2answers
8k views

how to solve the solder joints not shiny?

I have met a problem, need your help. I had used Sn62Pb32Ag2 (liquid temperature is 179℃)solder paste to solder components for many years,solder joints always are shiny. but recently,when I used it to ...
14
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2answers
21k views

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 ...
4
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2answers
2k views

Have I cooked my caps?

Recently been calibrating my solder reflow oven to work with a higher temperature solder paste. Had a few boards come out that were slightly over done. At 250 degrees Celsius I noticed that the silk ...
10
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2answers
1k views

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 ...
12
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3answers
5k views

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 ...
12
votes
2answers
29k views

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 ...
7
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3answers
4k views

Is it advisable to use lead-free PCB and solder paste on a first SMD assembly job?

I am sending my first PCB design to Sunstone for manufacture and I need to decide whether to order the board finish lead-free. All of the components are lead-free, and I have not decided on solder ...
17
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6answers
3k views

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-...
5
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1answer
3k views

Hot air lead-free BGA reflow

I'm experimenting with trying to reflow a 0.8mm BGA myself for prototypes/repairs. I've solved the main problem: alignment. I've used my 3D printer to print custom board guides that align on large ...
3
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2answers
488 views

Are PTC/resettable fuses really moisture senstive?

I recently bought some 0805 Multicomp PTC/resettable fuses from Farnell. They were MC36213 (500mA) and MC36206 (200mA). I plan to use these in product which may exist in a high humidity (~80-90%) ...
8
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2answers
4k views

Components on both sides of the board with reflow

Is it possible to place components on both sides of the board if I'm doing DIY toaster-oven style reflow soldering? I would think that doing the reflow twice (for the other side) might overheat the ...
9
votes
3answers
1k views

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 ...
7
votes
5answers
2k views

SMD solder now or later?

I'm soldering up some boards with smd parts, using a hot plate to reflow, and I'm (inevitably) realizing that I got some of the wrong parts. Now, is it better to leave the boards with smd components ...
13
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2answers
7k views

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,...