Electronics Forum | Sat Apr 05 21:51:42 EDT 2014 | garym4569
The 237*C is under the inductor with aTAL of 48s. I worked on the profiles this morning an got the max temp up a few degrees and the TAL to 62s. I will check the body temp of the Elec caps. The rest of the board has a max temp of 247. Thanks Gm
Electronics Forum | Mon Apr 07 13:12:02 EDT 2014 | cyber_wolf
Gary, We are missing something here. I see no evidence of reflow at all. If you have a thermo couple under the inductor, 237 deg with a TAL of 48 seconds should work all day long.(even though it may be on lower end of process window) SAC melts at 21
Electronics Forum | Mon Apr 07 15:14:41 EDT 2014 | garym4569
I drilled a small hole from the other side in order to get my thermocouple under the inductor pad. I did not have anything on hand to fill the hole, so I covered with kapton tape the best I could. I suspect that is why it looks like it should work.
Electronics Forum | Tue Jun 03 16:18:54 EDT 2014 | patel_daxa29
I have not seen expiration date on parts so far. I have seen people uses 10 year old parts too as long as it solders good.
Electronics Forum | Tue Jun 10 11:56:52 EDT 2014 | rway
It's hard to say. My guess is it's a cap or inductor. Have you tried measuring it? Is it me, or does this part appear to have a transparent package? It could be the flux I'm seeing.
Electronics Forum | Thu Dec 15 07:38:33 EST 2016 | emeto
Passive components are the one's that don't gain power on the output. The one's that do are called active components. Diodes, resistors, caps and inductors are examples of passive. Transistor is active component.
Electronics Forum | Fri Oct 06 01:08:17 EDT 2017 | tsvetan
potting the board with epoxy will make it non repairable the same insulation effect you would achieve if you just put around the inductors some styrofoam or other sound insulator without messing with epoxy
Electronics Forum | Thu Aug 01 04:57:10 EDT 2019 | ameenullakhan
hi Team, observed component skew during reflow process. Inductor location. I have attached the image for the same. Please provide your valuable feedback. Attached are the images for the same. Its SAC305 alloy , R0L1 flux chemistry. Regards, Am
Electronics Forum | Wed Sep 23 12:30:49 EDT 2020 | kylehunter
You'll be searching for a while... There's no way you can have that large of inductance in an 0805 package. You'd be hard-pressed to even have a 1mH in an 0805.
Electronics Forum | Mon Jan 09 12:34:00 EST 2023 | stephendo
Molten metal has a high surface tension. If the pads are uneven you can have uneven forces. Decades ago if part were not placed exactly right, they would come out of the oven centered. (or tombstoned)
