Can SOIC components be used with DIP? - diyAudio
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Old 23rd June 2006, 12:19 PM   #1
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Default Can SOIC components be used with DIP?

Hello
I have SMT opamps which i would like to use.
but i have only opamps in SMT packages and all other components like bypass caps,res. and other caps etc are all the classic thru hole.
can i use the other components with the SMT ICs?
Even the 100nf cap for supply bypass is bigger than the SMT IC.

Sagar
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Old 23rd June 2006, 12:34 PM   #2
cetoole is offline cetoole  United States
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Probably the easiest way is using Brown Dog adapters. I have used them a few times, and they are pretty good. You could also bend the leads out and solder them to a dip socket, or airwire it.
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Old 23rd June 2006, 12:42 PM   #3
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you can also use copper foil -- the adhesive variety from 3M -- with a hobbyist knife cut the foil into a thin strip -- apply just as the doctor ordered.

i use SMT ceramic caps in DIP designs for bypass caps -- just tack to the solder pad of the DUT, other end to the ground plane.
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Old 23rd June 2006, 12:49 PM   #4
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what i exactly want to know is.....the opamp will need bypassing,since i dont have SOIP caps so can i use the regular caps for that?

Sagar
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Old 23rd June 2006, 12:55 PM   #5
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100nF and 10nF ceramic bypass caps are on 100 mil lead spacing -- no reason that they can't be used -- here's a hint from Analog Devices -- the ground connection for the bypass cap should be as short as possible -- elsewise it's a radiator --
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Old 23rd June 2006, 12:56 PM   #6
paulb is offline paulb  Canada
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Quote:
Originally posted by sagarverma
what i exactly want to know is.....the opamp will need bypassing,since i dont have SOIP caps so can i use the regular caps for that?

Sagar
Yes.
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Old 23rd June 2006, 01:02 PM   #7
Wynand is offline Wynand  South Africa
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You can mix them as you want/need to.

Take the Mute resistor on the LM3886/876 chips as an example.
Most use a 1206 size SMD resistor.
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Old 23rd June 2006, 01:05 PM   #8
Wynand is offline Wynand  South Africa
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The only problem I've found is that if you use for example a SMD opamp and push-through caps and you design your own PCB. The soldering of the caps is a problem, unless you have the options of having the PCB professionally made, or if you don't mind soldering the caps/opamp on the bottom side of the pcb
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Old 23rd June 2006, 01:07 PM   #9
Wynand is offline Wynand  South Africa
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On the topic, does anyone know how to make diy vias?

It's easy to make pads on both sides of the pcb and joining them with a peice of wire, but my problem is having vias under, for example, an SMD opamp. The height of the solder will lift the chip too high.
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Old 23rd June 2006, 01:10 PM   #10
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i dont have any probs with soldering the SMT ,i can make adapters etc etc and all that, but what i fear is that the normal big bulky 100nf cap(as compared to SOIP very small opamp)
,,can it have a damaging effect on the IC,,like destruction due to static on the leads of cap,or other factors(the bypass cap is placed close to IC,so its worrying me)

Sagar
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