| Electronics > Beginners |
| Who inventes SOIC16? |
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| uc:
--- Quote from: wraper on June 02, 2018, 02:54:01 pm --- --- Quote from: uc on June 02, 2018, 02:48:06 pm ---In order to soldering the next generation electronic components I need: 1. Electron microscope ... --- End quote --- Sure you don't need that (look at the picture). Even if you meant digital microscope, it sucks for soldering. Optical stereo microscope is much better for the task. EDIT, ok I didn't get the joke because missed iron tip size. But seriously, there are a lot of components which are just a bare silicon die (second pic) and they are soldered a usual way. By usual I mean reflow soldering. I hand solder them with hot air without an issue. Soldering iron is completely useless for any BGA or LGA type package (unless you make a dead bug). --- End quote --- Thanks wrapper, It was not a joke in respect to insult the intelligence. I just highlighted the technology progress that proof me obsolete. ;) |
| Rick Law:
--- Quote from: uc on June 02, 2018, 02:48:06 pm ---The conclusion of my Q is that I feel really behind regarding electronic technology. I probably will stay at “through hole to surface mount” and SOIC until am master it. But I must make an amusing comment. So if I understand the correct technical progress toward future! 8) In order to soldering the next generation electronic components I need: 1. Electron microscope 2. Soldering iron tip of 200 nm 3. Steady hand Take care --- End quote --- UC, I am a hobbyist. I might have encountered what you are encountering. I think you may be caught where I was, so this may help encourage/energize you... that's the motive of me writing this reply anyhow... Looking at the miniature SMDs on a board looks both overwhelming and intimidating. I am retirement age - so I don't have steady hands nor do I have good vision. Two or three years back (there about) - approx 1-2 years into my EE as hobby venture, I had a board (ADA Fruit ADS1115) with a blown SMD and finally decided to deal with the intimidation I felt that held me back. If you are intimidated by the apparent difficulty in dealing with tiny tiny SMDs, the best thing to do is really just to over-power it. Practice is probably the best tool to increase your confident and a success (even within many failures) is the best way to overcome that feeling of intimidation. I use reading glasses normally. Basically the 2.00x reading glass = 2x magnifying glass. I also have a 10x loupe magnifying glass. I watched a few of the SMD soldering videos and went to work. Using an old StarTec phone, I removed any of those SMDs chips and other SMD components I can reach. I resoldered them back. I know a lot of them I probably fried (overheated). Some even had their legs melted away. I didn't care, because I was just practicing the soldering/desoldering. After about 5-10 hours of practice (over many days), I can solder on one quick enough that it probably didn't overheat, and the legs didn't self-destruct. With that, I did my real solder repair work. (I set good speed as less than 1-second continuous contact between soldering tip and IC's leg. The actual soldering limit is typically in the component's datasheet.) To overcome my own sense of feeling intimidated, I actually did my first repair with the TSSOP (0.65mm pitch, that's about 9x smaller than SOIC 16's 6mm pitch). I did both a TSSOP and an SOT23-8 (also 0.65 pitch) one after the other. I told myself if I did this one right and even with just one out of two works, other chips (with much larger pitch) would be cake walks. Both actually worked - it was luck for sure that both worked my first repair job, but practice certainly helped. I am no expert. The repair worked but it looked far less than perfect. Following that pair of repair work, I feel I can do it. The next few times with similar size were at perhaps 75% success rate, but that helpless/hopeless feeling of "this is damn near impossible" is gone. I am confident I may not get it right the first time, but I will. Go to it, use something cheap or worthless as practice (so there is no financial reason to hold back). My equipment list: - my vision is aided by a 2.00x reading glass. - I used a 10x loupe for inspection of work done. (Now I also use a 40x as well). - I used a 1mm width chisel head soldering tip. - 1mm multi-core solder-wire - Cheapo tweezer (hair removal tweezer from a "personal grooming kit" sold with finger nail clip for $1) - A screw driver (to press down on the IC to hold it in place) That was enough to get me to do my first two real work the first go. Give it a try. Just brush aside the reservation and hit it. Hitting it is the best way to wipe away the "this is freaking impossible" feeling. |
| RoGeorge:
--- Quote from: uc on June 02, 2018, 03:40:46 pm --- --- Quote from: bitwelder on June 02, 2018, 03:13:02 pm ---Perhaps you can also start to dab (pun intended) into solder paste and ways to reflow it. Warning: a steady hand is still required, unless you can afford a P&P machine --- End quote --- Sorry I do not understand, please explain? --- End quote --- Usually, SMD (Sourface Mounted Device) parts are not soldered pin by pin using soldering wire and soldering iron. Instead of soldering wire, there is a paste made out of microscopic soldering alloy balls mixed with flux. It looks like a grey metallic goo. The soldering paste can be spread only over the solder pads of a PCB (Printed Circuit Board), then plant all the SMD parts. Later, all the PCB together with the parts and the soldering paste are put in an oven, and heated for a specific thermal curve. This will melt the tiny balls of soldering alloy inside the soldering pasted that was spread over the PCB pads. The solder paste will melt, thus soldering all pins and all parts at once. Sometimes, instead of a heating oven, a stream of hot air can be used to solder (or rework) only small parts of a PCB. |
| kerouanton:
Yesterday I've discovered a new class of SMD components... This is a 008004 size capacitor. Try to solder that by hand ;D More info and pics here: https://imgur.com/gallery/cEvDrYP |
| bd139:
I reckon I could solder that. I might lose half a reel of them on the floor first :) |
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