Timeline for SMT soldering for QFN package without legs
Current License: CC BY-SA 4.0
16 events
| when toggle format | what | by | license | comment | |
|---|---|---|---|---|---|
| Jan 11, 2021 at 20:29 | comment | added | varun | I'll put other SMT parts that have legs to keep an eye on the process. I don't want to put all the components. Some of the are through hole. Thanks for the advice. | |
| Jan 11, 2021 at 20:22 | comment | added | Maple | @varun if you have other SMD components on a board you can do them all in one go. with added benefit that exposed pads/leads will give you better view of the melting process. It is hard to know when QFN is ready, unless your oven has thermal profile control | |
| Jan 11, 2021 at 20:21 | comment | added | jwh20 | It takes some practice. Don't start with your good stuff! Get some "SMT practice" boards and parts and get a feel for how this works. | |
| Jan 11, 2021 at 20:17 | comment | added | varun | Alright. I'll just use solder paste. Put it in a toaster Oven. The moment I see solder flowing, I'll turn it off. Wait till It cools off then solder other components manually after. And this oven will only be used for this. Nothing else ever again. | |
| Jan 11, 2021 at 20:16 | comment | added | jwh20 | When doing it this way I have found that using flux yields a better result. But this is hardly a production ready process. Your mileage may vary! | |
| Jan 11, 2021 at 20:14 | comment | added | Maple | There is absolutely no need to use flux with solder paste, because solder paste already has flux in it. In fact, excess of flux can create extra problems when soldering QFN, just as excess of paste would. | |
| Jan 11, 2021 at 20:00 | comment | added | jwh20 | Search for "Arduino smt oven control" | |
| Jan 11, 2021 at 19:57 | comment | added | varun | Thank all you for the suggestions. And yes, I will be careful. | |
| Jan 11, 2021 at 19:36 | comment | added | jwh20 | Be VERY careful with a toaster oven. It's easy for it to get WAY too hot. That's why I like the hot air method. You can see the solder flow and stop heating right away. | |
| Jan 11, 2021 at 19:35 | comment | added | jwh20 | I've used this: digikey.com/en/products/detail/chip-quik-inc/SMD291AX10/2057271 and also this: digikey.com/en/products/detail/chemtronics/CW8400/768491 | |
| Jan 11, 2021 at 19:32 | comment | added | varun | Me too. Alright. I'll use a toaster oven. About the paste, is this the right one? digikey.com/en/products/detail/chip-quik-inc/TS391AX50/7802229 I'll apply this to the pads, place the components, then place the board in a toaster oven for a few minutes. | |
| Jan 11, 2021 at 19:31 | comment | added | jwh20 | There are many ways to do it. You asked for how one does it. I explained how I've done it with reasonable success. The soldering iron "swipe" method also works but I've had a lot of trouble with solder bridging with that method. | |
| Jan 11, 2021 at 19:27 | comment | added | jwh20 | But an oven will work, toaster oven, or a paint stripper heat gun from the hardware store. | |
| Jan 11, 2021 at 19:26 | comment | added | jwh20 | I got a small heat gun that is sold in craft stores. Less than US$20. | |
| Jan 11, 2021 at 19:18 | comment | added | varun | They seem pretty pricey. I just need to solder this one component this way. I can solder other SMT packages without any issues. Unless there is no other option, I would not wanna buy a heat gun. | |
| Jan 11, 2021 at 18:49 | history | answered | jwh20 | CC BY-SA 4.0 |