There are certainly electrical engineering jobs for where soldring is required and won't help. For example, if you worlk on high-speed digital signals -- you know the 10Gbps kind and faster -- hand soldering on a board can have devastating effects on signal integrity. But even if that's your world, you should still know how to solder.
> Do today's engineers do all their work using software simulation and don't build prototypes anymore?
Not always. Simulation can be very handy for flushing the bugs out of an idea, but once the simulation works it's time to heat up the soldering iron and breadboard it. Am in the simulation stage of a project right now, today will finish the schematic and order the components. Will be interesting to see how close the simulation correlates with the real thing.
I have been an EE for over 13 years. I can solder, if I have to, but the technicians are trained and better and it is their job anyway. A lot of stuff requires specialized rework fixtures anyway and they aren't going to bother training engineers for all of this. But, I can sucessfully remove or install an 0402 if I absolutely have to.
Well, I would generally use a microscope or magnifying glass. The problem with a magnifying glass is that I can't usually get it to be still enough for me to stay focused.
Sometimes the resistor or capacitor is a rare value and I just have them hang one end off a pad to save it.
I don't usually try to remove ICs unless I am not interested in saving them. My technicians can do the job and get the board back to me before I could get set up to do the work so I just get them to do it. My skills lie elsewhere, I suppose.
A lot of new graduates would argue soldering is not necessary because of SMT. "Who can really solder SMT?"
To me, soldering is a must have skill to all electrical/ electronics engineers, seriously, even software engineers in the embedded field. To my experience, there will always be a moment that you need to remove a componet to replace a component to test for example, the bootstrap configuration. At that moment, I would rather do it quick w/o waiting for any helps.
No doubt, soldering a SMT component isn't easy. Too much heat for too long might destroy the pad, too much solder will short the circuit. Not enough heat and time will keep the solder properly "glueing" the component to the pad. I encourage any new graduates who want to make a career in the field to take the course. It is fun to get your hand dirty and see the prototype board working.
SMT covers a pretty broad range of parts, some of which are more easily soldered or de-soldered with an iron, but others...not so much.
An 0402 chip resistor or chip cap is 0.4mm x 0.2mm -- roughly the size of each digit in the year on a U.S. dime. Sure, you can work with that if you have tweezers, a microscope and a fine tip on your iron. Temperature control & time is important too, since it's far too easy to lift the pads right off the PCB if you're not careful. But soldering these components is feasible -- techs do it all the time, so why not engineers?
On the other hand, try working with a high pin count BGA -- hundreds of solder bumps (balls), none of which is visible after soldering. There is a reason we have machines for that -- complete with optics & cameras for proper alignment to the PCB pads, a vacuum picker to handle the IC, and controlled, even heating to ensure all the hundreds of solder bumps melt at essentially the same time.
Yes, a soldering iron has its use for certain types of circuits -- mostly lower frequency stuff -- and certain types of components like passives, as well as ICs in soldering-friendly packages like through-hole, QFP, LCC and others where you actually have visibility and access to the pins that are to be soldered.
But is expert skill with a soldering iron a requirement for EEs working on hardware? Not always. It depends a great deal on the types of products you're working on.
Your size for 0402 seemed pretty small....but it is right if you're using Metric sizes. 0402 imperial is actually 1 x 0.5 mm which is about the smallest thing I'd like to try soldering with my smallest 1mm tip.
Wikipedia has a nice table showing both sizes, if this does not come out here it'a at
Everyone complains about how hard it is to solder SMD, but I think that this has prevented a lot from trying. The truth is that it is really not all that hard. The reason I think that most fail at it is that they are trying to do it with a soldering iron. The first SMD device that I soldered was a 2mm x 2mm DFN8 part. I did it with solder past and a hot air rework station. I have yet to kill a part, and now and again, I need to retouch a single pin, but almost all the things that I have soldered in this fashion have functioned as expected right out of the box.
I've reached a point where it's hard to solder almost anything. I really need a lighted magnifier to solder. One time, I had to take off my glasses to see what I was doing. I could feel the heat from the iron on my face. That's a little too close.
I think the emphasis on soldering is somewhat embarassing.
First off, I can't imagine too many EEs who didn't start out, before college, being tinkerers of one sort or another. So I can't imagine too many that haven't mastered the basic skills in soldering. But it's a basic skill. Like tying your shoelaces, or I dunno, riding a bike. It's not something to dwell on.
As much as the average joe has no idea what engineers do to begin with, putting any emphasis on soldering is just, you know, embarassing. "Oh! That's what you do. You're the guys who solder those little thngies on little boards. Now I understand."
@Bert.... WE know that there is more to electronics than soldering itty-bitty thingies on boards. But the unwashed don't, and it';s still something that impresses them. So if it happens, quit while you're ahead. :-)
Sadly, I think that there are a lot of engineers that became engineers not because they loved engineering, but they were good at math and science. This is not to say that they are bad engineers, just that they do not have the experience and passion that drove others to choose engineering. For me, engineering is not just my profession, but my hobby and my passion. I go home at night and I never take off my engineer's hat, I just replace my company's hat with my own.
(Sorry if I made a spelling error, the browser spell sheck is not working. Engineers may have come up with spell check, but it was someone else that came up with the dictionary to check it against).
Excellent analogy. Let's take it further: Even among architects who do know how to use a table saw, not all of them are skilled at fabricating the table-top scale models of their designs, or the tiny wood, plastic or glass pieces required to build that scale model.
We old-timers of the electronics business fondly remember the days of through-hole leaded components, when as a hobbyist you could design & build your own project, etch your own PCB and mount the whole thing in a plastic or aluminum box in which you had drilled holes for connectors, switches, knobs & LEDs. But now we work with tiny SMD components, multi-layer PCBs and ICs that have mind-boggling numbers of fine pitch pins (or solder bumps) and advanced packaging designs that don't lend themselves to those old-fashioned assembly techniques. We work with components that are so small, you need a microscope to inspect them on a PCB, and if you happen to accidentally drop one on the floor while sitting at your lab bench, forget about it -- you're not likely to even find it.
Just my 5 cents, but I have started electronics by building circuitry from the book (Elektor) and explore my way around it: "Would the sound improve if I solder 2 transistors in place of 1 transistor?" and more silly experiments. This was a very learning period around my 14th and 15th year of age. Now I see -with tears in my eyes- people simulating their brains out. They have no clue and just 'turn the knobs' to get to the end result they want or need. They all miss the 'exploration period' as I did in my starting years. But hey, I am basically an analog engineer, should be without a job because analog is done, it's out.... But fortunately for me the whole world is analog. Around me I see big projects fail due to the fact of lousy managers not recognizing this point. They certainly never had that exploration period in their life as most of us engineers did.
@Navelpluis... I also learned a lot from Elektor in the old days. It was a great magazine...good projects and most had PCB layouts with them. I still have a lot of my old copies. Analog is, if anything, more important these days - unless you present a good signal to a DAC you can get some terrible results.
Blog Make a Frequency Plan Tom Burke 17 comments When designing a printed circuit board, you should develop a frequency plan, something that can be easily overlooked. A frequency plan should be one of your first steps ...