[sdiy] "Zerolytics"

ColinMuirDorward colindorward at gmail.com
Sun May 10 18:13:33 CEST 2020

Well now I know where to get technical data, just ask Steve!

Following your lead I'm checking characteristics of  CL31A106KBHNNNE
(1206,50v, 10uf, JLC "basic part").
it's looking like we get around -60% capacitance around 12v.
Not sure why, but in this
catalogue it shows different data for the same part (look for the blue XR5
line on the chart neat the end).

Assuming the first one is accurate, I guess you could try asking the robot
to put down three on each power rail and you'd have your 10uf. But that's
quite pointless when you could just pay the $3 "extended part" acquisition
fee and get a seven cent electrolytic.

On Sat, May 9, 2020 at 6:23 AM Steve Lenham <steve at bendentech.co.uk> wrote:

> On 08/05/2020 17:31, ColinMuirDorward wrote:
> > Thanks for spelling that out for me, Steve!
> >
> > It only occurred to me to try 10uf ceramic when I noticed them available
> > in the "basic parts" catalog at JLCPCB.
> > The one I'm looking at is "CL21A106KAYNNNE". It's $0.03, 25v, X5R, 0805.
> > I'm looking through the datasheet
> > <
> https://datasheet.lcsc.com/szlcsc/Samsung-Electro-Mechanics-CL21A106KAYNNNE_C15850.pdf>and
> > can't find anything to describe it's voltage dependent characteristics.
> > Do I not know what I'm looking for, or do they leave that bit out?
> With apologies to Douglas Adams:
> “But the voltage dependency characteristics were on display…”
> “On display? I eventually had to go down to the cellar to find them.”
> “That’s the display department.”
> “With a flashlight.”
> “Ah, well, the lights had probably gone.”
> “So had the stairs.”
> “But look, you found the data, didn’t you?”
> “Yes,” said Arthur, “yes I did. It was on display in the bottom of a
> locked filing cabinet stuck in a disused lavatory with a sign on the
> door saying ‘Beware of the Leopard.”
> That document you linked to is more of a brochure than a datasheet. It
> lists the hundreds of MLCC capacitors that Samsung make without much in
> the way of parameters for each one. There is usually an individual
> datasheet for each cap but it is not always easy to find.
> I Googled for that exact part number and, interestingly, most of the
> results were for distributors and none for Samsung themselves.
> Undeterred, I tried the datasheet offered by Farnell - and found that it
> identified itself as a "Spec Sheet" and contained no graphs or
> characteristic data.
> Eventually, Digikey provided this "Characteristics" sheet, which is what
> I was looking for:
> https://media.digikey.com/pdf/Data%20Sheets/Samsung%20PDFs/CL21A106KAYNNNE_Char.pdf
> Have a look at graph 3. It shows that this 10uF/25V cap drops to around
> 2uF with 12V DC bias and around 1uF with 20V.
> Cheers,
> Steve L.
> Benden Sound Technology
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