Become an expert on doing quick searches to find the right ceramic part for your design, create plots for capacitance, ESR and other electrical properties, and estimate aging effect on ceramic capacitors
5. KEMET.com
• Use this tool to:
http://www.kemet.com
See New Product launches Access Product Catalogs
6. Engineering Center
• Use this tool for: technical search (KEMET products, terminology,
definitions, product characteristics, applications, webinars)
https://ec.kemet.com
• How does temperature affect capacitance change in ceramic
capacitors?
EXAMPLE
8. Aging calculator
Exhibited by Ferroelectric dielectrics
Class II, III, and IV
(X7R, X5R, Y5V)
Over time,
molecular structure
changes
Material’s dielectric
constant changes
Holds less
electrical charge
Capacitance will
decline over time
What does Aging mean?
9. Aging calculator
For Class II and Class III diel
X7R, X5R, Y5V and so on
Cap decreases over time
KEMET part number C0603C105K8PACTU
But, how much?
10. Aging calculator
• Use this tool to: Create a chart of expected capacitance over
time for a specific KEMET PN.
https://ec.kemet.com/tools
https://search.kemet.com
Available in Engineering Center “Design Tools”
12. Component Edge
• Use this tool to search any KEMET PN and
to cross competitors parts.
https://search.kemet.com
1. Enter KEMET Part Number
2. Enter description or key words
3. Browse by menus
10nF 250VAC
15. Component Edge
• What’s the temperature coefficient and insulation resistance for PN
C1812C145J5JLC7800? Does it meet RoHS? Which are the benefits of the
series?
EXAMPLE
16. Component Edge
• How does C1206C102KDGACTU compare to C1206C102KDRACTU in
terms of electrical specs and which one would you rather use for pulse
applications?
EXAMPLE
17. KSIM
• Use this tool for: capacitor simulation and to export SPICE models
http://ksim.kemet.com
Determine:
• Impedance and ESR
• Capacitance and Inductance
• Current and Voltage
• Temperature Rise
• SPICE model
• Effect of combined Impedances
• Export of SPICE models
18. KSIM
Optional: external
resistance, inductance
Operating Voltage or
“DC bias”
Operating
Temperature
Start and stop
operating Frequency
PN
INPUT OUTPUT
Temp rise vs Ripple
Current
Capacitance vs Vbias
Current & Voltage
Capacitance &
Inductance (SRF)
Impedance & ESR
19. KSIM
• What’s a SPICE model and why is so import to our customers?
Simulation Program with Integrated Circuit
Emphasis
SPICE
Open-source software that simulates the operating
conditions of analog circuits.
Simulating the circuit with SPICE is the industry-
standard way to verify circuit operation at the
transistor level before committing to manufacturing
an integrated circuit.
SPICE for C1812C474J5JAC @ 25°C and 0VDC bias
20. KSIM
• What is the
impedance and ESR
of
C1206C154K2RAC
at a frequency of
1MHz with a bias of
50V at 85°C?
EXAMPLE
Impedance = 1.263 Ohms
ESR = 25.222 mOhms
21. KSIM
• What is the
maximum allowable
ripple current for
C1206C105K3RAC
at 130°C and
3MHz?
HINT: Use Current &
Voltage plot
EXAMPLE
NOTE: Temperature must be
changed to 125°C since this
is a X7R diel
Max current = 2.423 Arms
