One of their dirty secrets is that the capacitance is not just a function of voltage, but package size also. You can compare 0402 to 0805 10uF caps with Murata SimSurfing tool and see that you will get less actual capacitance with the smaller packages. Still, it's a lot of capacitance for that package.
Thanks, I hadn't realized Murata had gotten ahead of TDK. Last time I compared the ranges TDK looked to give more comprehensive data about capacitance under bias. Now I see Murata's search capability is more powerful than TDK's but not quite as intuitive to use at first.
Very interesting to see an effective 3.4uF under bias from an 0402 size. WTG Murata.
Playing with the SimSurfing I am shocked (not being sarky either) to notice that's not always true for all package sizes. Very hard to believe but there's an 0805 showing almost twice the capacitance under bias (25V) of the highest capacitance 1206. Needs more investigation!
<later>Looks like someone screwed up as the plot of this miracle 0805 for cap vs bias looks very lack-lustre. I'm rapidly falling out of love with SimSurfing....
Last edited:
It may only hold true for the same series (i.e. GRM to GRM). There might be other factors that dominate, but I'm used to seeing that effect within the same family anyway. Might not hold true all the time.
Could be finger trouble from me - here's what I am doing.
I want to find the most capacitance at 25V DC bias. So I put '25' in the box in the 'advanced search' (top right) and put in a range below that (1-100uF). All the other boxes I don't touch. Press 'Search'
The top two caps based on the third column 'Effective cap' now show 88.5uF in 2220 package. That's to me a very optimistic amount of capacitance left for a 100uF cap at 25V. So click on the top one then click on 'Product detail' to see its data. Scroll down for the DC bias graph and read off 44uF at 25V. Looks like an example of lying to me, what am I missing?
I want to find the most capacitance at 25V DC bias. So I put '25' in the box in the 'advanced search' (top right) and put in a range below that (1-100uF). All the other boxes I don't touch. Press 'Search'
The top two caps based on the third column 'Effective cap' now show 88.5uF in 2220 package. That's to me a very optimistic amount of capacitance left for a 100uF cap at 25V. So click on the top one then click on 'Product detail' to see its data. Scroll down for the DC bias graph and read off 44uF at 25V. Looks like an example of lying to me, what am I missing?
Ah, I'd never sorted by effective cap before. I usually just look at the graphs once I find a part via DigiKey search.
Yeah it’s a bit weird. I typically have assumed similar effective capacitances among all major manufacturers like TDK, Kemet, Murata, Taiyo Yuden, and AVX... but maybe that’s a mistake. Samsung has some very competitive offerings now but they have the smallest amount of available data.
I haven’t tried Yageo caps, though their thick film resistors are ubiquitous in designs I see at work without issue.
For the most uses, the manufacturer of the X5R and X7R decoupling isn’t critical to device functionality, so we pick whatever is available due to the supply issues with the larger caps and let the parts guys know to prefer Murata, TDK, or Kemet parts if available.
The reason for me to choose 0306 is that 03 fits on the chip terminal directly.
And 0306 is just the biggest cap you can find at that whit.
If the capacitance is 10uF or 6uF really doesn´t matter as long as it is 60 times bigger than 100nF!
AWK107BJ106MV-T Taiyo Yuden | Mouser Sverige
My question is if the voltage regulation of the Pro-Jekt Pre s2 can handle the cap without oscillation.
And 0306 is just the biggest cap you can find at that whit.
If the capacitance is 10uF or 6uF really doesn´t matter as long as it is 60 times bigger than 100nF!
AWK107BJ106MV-T Taiyo Yuden | Mouser Sverige
My question is if the voltage regulation of the Pro-Jekt Pre s2 can handle the cap without oscillation.
- Status
- This old topic is closed. If you want to reopen this topic, contact a moderator using the "Report Post" button.