SMD Electrolytics

[D from BC]

I was looking for a 2.2uF 100V electrolytic cap and ....there's no SMD
version available from Digikey??
Also, seems like many electrolytics are through hole.

I guess the pads probably rip off with G shock.

I've been converting throughhole components to 'quasi-SMD'. I use glue
gun glue, silicone, big pads and kinky lead bending. What a pita...

How about an adhesive under the capacitor that melts during plate
soldering? That way the capacitor is fastened to the pcb.

Wouldn't it be nice if every component were SMD?


D from BC
British Columbia
Canada.

 

[Joerg]

I was looking for a 2.2uF 100V electrolytic cap and ....there's no SMD
version available from Digikey??
Also, seems like many electrolytics are through hole.

I guess the pads probably rip off with G shock.

I've been converting throughhole components to 'quasi-SMD'. I use glue
gun glue, silicone, big pads and kinky lead bending. What a pita...

How about an adhesive under the capacitor that melts during plate
soldering? That way the capacitor is fastened to the pcb.

Wouldn't it be nice if every component were SMD?

Vishay P/N 2222-139-69228. 2.2uF/100V SMT. Mouser carries them but 9wks
leadtime and expensive. Not for new designs but I bet Vishay has a
replacement.

http://www.vishay.com/docs/28301/139cll.pdf

 

[Spehro Pefhany]

I was looking for a 2.2uF 100V electrolytic cap and ....there's no SMD
version available from Digikey??
Also, seems like many electrolytics are through hole.

I guess the pads probably rip off with G shock.
EEV-EB2W2R2Q


I've been converting throughhole components to 'quasi-SMD'. I use glue
gun glue, silicone, big pads and kinky lead bending. What a pita...

Why don't you try slipping the leads through small holes in the PCB
and soldering the opposite side?

How about an adhesive under the capacitor that melts during plate
soldering? That way the capacitor is fastened to the pcb.

Wouldn't it be nice if every component were SMD?
Nah.


D from BC
British Columbia
Canada.

Best regards,
Spehro Pefhany

 

[[email protected]]

Why don't you try slipping the leads through small holes in the PCB
and soldering the opposite side?

Ah, the dry repartee in here is great lately.

 

[D from BC]

Why don't you try slipping the leads through small holes in the PCB
and soldering the opposite side?

Really!

Best regards,
Spehro Pefhany

D from BC
British Columbia
Canada.

 

[sycochkn]

I was looking for a 2.2uF 100V electrolytic cap and ....there's no SMD
version available from Digikey??
Also, seems like many electrolytics are through hole.

I guess the pads probably rip off with G shock.

I've been converting throughhole components to 'quasi-SMD'. I use glue
gun glue, silicone, big pads and kinky lead bending. What a pita...

How about an adhesive under the capacitor that melts during plate
soldering? That way the capacitor is fastened to the pcb.

Wouldn't it be nice if every component were SMD?


D from BC
British Columbia
Canada.

http://www.niccomp.com/

aluminum 2.2uf 100vdc smt.
Bob

 

[linnix]

Why don't you try slipping the leads through small holes in the PCB
and soldering the opposite side?

Is that quasi-quasi-SMD or quasi-TH? Some bean counters might charge
you double for soldering both sides. Just solder the component side.

 

[Martin Riddle]

I've noticed this also.
Since it was a supply cap, I picked the next size. You could always parallel them up.

Cheers

 

[D from BC]

Why don't you try slipping the leads through small holes in the PCB
and soldering the opposite side?



Best regards,
Spehro Pefhany

Hey ...that 2.2uF EEV-EB2W2RQ is a 450V SMT electrolytic with a big
ass 10mm diameter.
A 2.2uF 100V throughhole has a 5mm diameter..
0.21 cents for the pita throughhole or $1.21 for a big ass SMT..
Huhhh...decisions decisions...

I wonder if there's little bases I can put on throughhole capacitors
to turn them to SMD?
Call it a SMD conversion kit..
1st solder the throughhole part to the base, then surface mount
solder.
___________
| cap |
Idea: | |
| | <throughhole cap
----------
--------| -----|---------
+========| -----|=========+ < trace from via
====+-------/ \----/ \--------+===== <smd foot
^
solder in this socket

Am I rich?


D from BC
British Columbia
Canada.

 

[linnix]

Hey ...that 2.2uF EEV-EB2W2RQ is a 450V SMT electrolytic with a big
ass 10mm diameter.
A 2.2uF 100V throughhole has a 5mm diameter..
0.21 cents for the pita throughhole or $1.21 for a big ass SMT..
Huhhh...decisions decisions...

I wonder if there's little bases I can put on throughhole capacitors
to turn them to SMD?
Call it a SMD conversion kit..
1st solder the throughhole part to the base, then surface mount
solder.
___________
| cap |
Idea: | |
| | <throughhole cap
----------
--------| -----|---------
+========| -----|=========+ < trace from via
====+-------/ \----/ \--------+===== <smd foot
^
solder in this socket

Yes, you can just feed the pins through the base and bend them
sideway. The base should be made of plastic with high melting
temperature. It should cost only pennies each, except for the first
piece.

Am I rich?

Yes, if you don't have to pay for the first piece.

 

[MooseFET]

Really!



D from BC
British Columbia
Canada.

Why don't you change your circuit to use other part instead? Be flexible
like me, sometimes I can change caps, resistors, or combine the two. Do you
know the RC trick? it will save you lots of hassles. I bet Jim Crook and
his gang don't know it.

 

[Eeyore]

Wouldn't it be nice if every component were SMD?

Some people feel EXACTLY the opposite. SMT is lousy for small runs.

Graham

 

[Eeyore]

Is that quasi-quasi-SMD or quasi-TH? Some bean counters might charge
you double for soldering both sides. Just solder the component side.

And what about when you have components both sides ?

Graham

 

[D from BC]

Some people feel EXACTLY the opposite. SMT is lousy for small runs.

Graham

I like that I don't have to drill holes and flip a board around and
around and around.
Often my designs are single layer which allows me to do hot plate
soldering.
SMD/SMT chip components are smaller for a compact design.


D from BC
British Columbia
Canada.

 

[Eeyore]

I like that I don't have to drill holes and flip a board around and
around and around.

I don't drill holes either. At least not since 30 something years ago.
Why are you making your own boards ?

Graham

 

[Mike Harrison]

I was looking for a 2.2uF 100V electrolytic cap and ....there's no SMD
version available from Digikey??

Ceramics are available in this value - a bit pricy in low volumes but you may be able to find them
somewhere else with better low-volume pricing

 

[Spehro Pefhany]

Hey ...that 2.2uF EEV-EB2W2RQ is a 450V SMT electrolytic with a big
ass 10mm diameter.

It'll be great if you have a lot of ripple current, which those
ratings make me suspect. What's it for anyway? Film caps could last
forever, but will be the largest way to go.

A 2.2uF 100V throughhole has a 5mm diameter..
0.21 cents for the pita throughhole or $1.21 for a big ass SMT..
Huhhh...decisions decisions...

Okay, 3.3uF or 4.7uF looks to be more available (14 different part
numbers in stock). Eg. EEE-HA2A3R3P, which is 105°C-rated.


Best regards,
Spehro Pefhany

 

[linnix]

I like that I don't have to drill holes

I don't either. The PCB factory does.

and flip a board around and around and around.

I don't have to solder the bottom, just solder the top (component
side).

Often my designs are single layer which allows me to do hot plate
soldering.

You can still do the same. We trim the lead to flush mount with the
PCB on the bottom, with the pins holding them in place.

SMD/SMT chip components are smaller for a compact design.

Not always. Sometimes, vertical clearance is important as well.

And for the most important reason, the holes allow more precise
component placements by hand, as opposed to pick and place machines.
The components I am dealing with are too big and irregular for
machines anyway. Not until we do 10Ku, we are doing by hands.

 

[Greg Neff]

I was looking for a 2.2uF 100V electrolytic cap and ....there's no SMD
version available from Digikey??
Also, seems like many electrolytics are through hole.

I guess the pads probably rip off with G shock.

I've been converting throughhole components to 'quasi-SMD'. I use glue
gun glue, silicone, big pads and kinky lead bending. What a pita...

How about an adhesive under the capacitor that melts during plate
soldering? That way the capacitor is fastened to the pcb.

Wouldn't it be nice if every component were SMD?


D from BC
British Columbia
Canada.

We use some SMD electrolytics in military applications. We have not
seen any mechanical problems in shake-and-bake testing or battlefield
use.

We glue the cases to the PCB after the PCB is soldered and washed,
using two-part Loctite E-20NS epoxy.


================================

Greg Neff
VP Engineering
*Microsym* Computers Inc.
[email protected]

 

[D from BC]

It'll be great if you have a lot of ripple current, which those
ratings make me suspect. What's it for anyway? Film caps could last
forever, but will be the largest way to go.


Okay, 3.3uF or 4.7uF looks to be more available (14 different part
numbers in stock). Eg. EEE-HA2A3R3P, which is 105°C-rated.


Best regards,
Spehro Pefhany

8mm diameter for the EEE-HA2A3R3P SMT. Uh...maybe I'll get it.
A 5mm diameter throughhole SMD'ize still has a smaller footprint.
I'll look around. Thanks..

There's low cap self heating in the app and the ambient temp is ~40C.
The cap is doing a stabilization role. On the freaky side, I have a
case where lots of ESR is actually useful. Wide tolerance allowed too.

About that SMT electrolytic with the 450V rating..
I'll guess that cap is fat with dielectric and thin with foil. So
maybe the ripple handling is poor compared to a 100V version of the
same diameter. But just guessing without looking at the dissipation
factors on the datasheets.


D from BC
British Columbia
Canada.