Webinar showing engineers how the capacitance of different capacitors change. Your applications voltage, temperature, and frequency can cause shifts in the critical specification. Here's how to calculate your applications effect on polymer type capacitors.

1. if ( 47µF == 47µF)
{ true; }
else
{false;}

2. It's in what’s printed(on)?
if ( 47µF == 47µF)
{
true;
}
else
{
False;
}

3. one slide statement
capacitance product group
< 4.7µF MLCC
application specific
>220uF Polymer respective
Tantalum

4. search.kemet.com

5. EIA-198-D
• Testsetup and conditions for :
• Ceramic dielectric capacitors classes I, II, III
• Polymer and Alu measured the same way
C_min C_max Test
Frequency
V_rms V_DC
0,1pF 1nF 1kHz 1V 0V
1nF 10µF 1kHz 1V 0V
10µF 1800µF 120Hz 0,5V 0V

6. MLCC construction

7. VCC
• VCC = voltage change capacitance
• Proportional with electric field in the dielectric
• thinner dielectric same voltage increase E-field

8. Net capacitance 47µF/6.3V
compare case sizes 0805/ 1206/ 1210
0V 5V dC %
0805 42,3µF 11,3µF 26 %
1206 42,8µF 22,9µF 52 %
1210 48,3µF 29,4µF 69 %

9. dielectric physics
• VCC = voltage change capacitance
• Force applied on charged particles caused by an
electrical field
• thinner dielectric same voltage increase E-field
( Downsizing!)

10. Design improvements
• Print Quantity Reduced ~30% prints
• Chip Thickness Reduced ~ 0.42mm
1210 0805
Dieletric ~1,75µm ~1,40µm

11. Example 0805/10µF 6,3V
Comparison between manufacturer A,B,C & D
allvaluesareaverages
Property UNIT A B C D
Cap µF 11,1 10,8 9,3 9,1
DF % 7,3 8,0 4,6 4,6
UVBD V 65 96 144 114
IR @25°C MΩ 148 105 174 216
IR@125°C MΩ 112 13 46 94
Dielectric Thickness µm 1,38 1,55 1,74 1,78
Electrode Thickness µm 1,27 1,67 1,57 1,44
Active Layers [1] 395 323 371 333
Stress V/µm 66 98 146 115
K [1] 2690 3176 2817 3434
Grainsize µm 240 490 350 360

12. VCC 0805 47µF 6.3V

13. compare VCC measured versus simulated

14. precision of the VCC chart
VCC K-SIM measured Cap_delta
1 0,2 % 2 % 1,8 %
5 -5,0 % -1 % 4,0 %
10 -20,0 % -20 % 0,0 %
16 -50,0 % -37 % 13,0 %
20 -60,0 % -52 % 8,0 %
25 -68,0 % -62 % 6,0 %
35 -77,0 % -75 % 2,0 %
50 -84,0 % -83 % 1,0 %
0 %
3,5 %
7 %
10,5 %
14 %
5 10 16 20 25 35 50

15. LTSpice capacitor simulation

16. C - Model in LT-SPICE
• VCC is not yet included in this models

17. Compare MLCC / Polymer @120Hz, RT
• AluPolymer in preparation for K-SIM
MLCC
0805
MLCC
1210
Polymer
B
Cap/µF 11,8 29,1 47

18. Compare technologies 47µF/6V @5V
AluPoly
1)
TaPoly MLCC
0805
MLCC
1206
MLCC
1210
net Cap/µF 41 49 11,3 22,3 29,4
max Temp/°C 105 125 85 85 125
max Height
/mm
9,7 2,1 1,45 1,8 2,8
Price2)/pcs
@2000pcs
0,3868 0,3984 0,2293 0,2475 0,4925
net c€/µF 0,9434 0,8131 2,0292 1,1099 1,6752
1) AluPoly Vr = 35V 2) price by Digikey for 2kpcs)

19. It's in what’s printed(on)?
if ( 47µF == 47µF)
{
true = Polymer; AluPoly;
}
else
{
false = MLCC; Downsizing ++ ; netCap - - ;
}

20. Thank You!
Axel Schmidt
Field application Engineer
Cell +49 172 89 25 284
email: AxelSchmidt@kemet.com
Hermann-Köhl-Str. 2
86899 Landsberg am Lech
Germany
www.kemet.com

21. VCC explanation
• Nominal capacitance is measured 1kHz/0VDC/1VAC
• Capacitance drop thru locked dipoles
• Ripple current decrease
• E-Field is voltage between electrode plates (distance)
• Downsizing requires thinner dielectric
• Thinner dielectric increase electrical field
• capacitane loss is higher