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Topic: How to pick surface mount components (Read 1 time) previous topic - next topic

fkeel


I need to order some 10uf capacitors and various resistors for a circuit I am working on. The components need to be fairly small, as the circuit will be flexible (it will be an extension of what I posted here: http://arduino.cc/forum/index.php/topic,66649.0.html). However, I am hand soldering them, so they cant be microscopic...

Now when looking at parts at digikey, for every itam I am looking at there are ~100+ very similar itams to choose from. So similar that I find it hard to chose the right one.

Can you give me any generall recommendations on how to chose the right surface mount component? Maybe you could even point me to a specific brand/formfactor that you are comfortable using.

The circuit will be partly arduino powered at 5 volts and ~200milliamps and partly use external power with 9V and ~400milliamps.

If you have any suggestions, they will be very much apreceated.

Cheers

p.

RuggedCircuits

I think people generally consider 1206 components to be easy to solder, 0805 to be generally OK, but many people start to complain about having to solder 0603 components or smaller. It is definitely doable, but one benefits from having some kind of magnifier. With a powerful enough magnifier I have even soldered 0402 components by hand but it is not fun (the biggest problem is losing the components because they are so small).

Why not get an assortment of resistors in various sizes (they are really cheap) and find out what your tolerance is (no pun intended).

--
Beat707: MIDI drum machine / sequencer / groove-box for Arduino

CrossRoads

Look for parts like these.

Resistor, 10K, R0805   R1      P10.0KCCT-ND
Resistor, 1K, R0805   R4      P1.00KCCT-ND
Capacitor, 100nF, C080RND   C1    08053G104ZAT2A   478-1423-1-ND
Designing & building electrical circuits for over 25 years. Check out the ATMega1284P based Bobuino and other '328P & '1284P creations & offerings at  www.crossroadsfencing.com/BobuinoRev17.
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James C4S

Keep in mind that ceramics aren't really meant to be hand soldered.  So you have to make a tradeoff between being big enough to solder and small enough that the entire SMD heats up evenly.  When I was new to soldering SMD I did 1206.  At this point, I am comfortable with 0805.  If I am using lead(Pb) solder, I'll go down to 0603.  (Lower melting points.)

For narrowing down the selection...  pick the package size, pick the voltage (give yourself headroom... remember ceramics have a voltage coefficient), select your Capacitance, click the "In-Stock" option, and sort by price.
Capacitor Expert By Day, Enginerd by night.  ||  Personal Blog: www.baldengineer.com  || Electronics Tutorials for Beginners:  www.addohms.com

cyclegadget


  This is a handy thread, I wish we could have some sticky threads like this.


Thanks guys,
Mark

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