Bypass/Decoupling Capacitor Characteristics

NOTES.

A series resonance occurs with an IC external local bypass capacitor, between it's capacitance and inherent  inductance. So often bypassing operates in the capacitors inductive region. It's therefore advantageous to minimise the associated inductance using multiple capacitors (generally of the same value) in order to provide a low impedance.

Capacitors are also available with increased width for reduced inductance see:
Low-inductance MLCCs for ligh-speed digital systems. Phycomp-Yageo  an08432. (PDF)

When considering capacitors fabricated with Y5V high dielectric material, be aware that capacitance varies significantly with temperature. 
Typical cap. characteristics vs. temp. with X7R, Z5U, Y5V. (PDF)

Also note that with ceramic capacitors, capacitance changes (reduces) with DC voltage applied.
Capacitance change with voltage applied 0201 X5R 100nF. (PDF)

ELECTRICAL CHARACTERISTICS

• One 100nF X5R ceramic chip 0201 SM cap, Murata GRM033R60J104KE19. (PDF)
• One 100nF X5R ceramic chip 0201 SM capacitor, Samsung CL03A104KQ3NNN. (PDF)

• One 2n2 nF X7R ceramic chip 0402 SM capacitor, Phycomp Farnell 301-9408 (PDF)
• Two 2n2 nF X7R ceramic chip 0402 SM capacitors, Phycomp Farnell 301-9408 (PDF)
• One 100nF X5R ceramic chip 0402 SM cap.  Murata GRM155R61A104KA01. (PDF)
• One 100nF Y5V ceramic chip 0402 SM capacitor, Phycomp (Farnell 301-9482) (PDF)
• Three 100nF Y5V ceramic chip 0402 SM capacitors, Phycomp (Farnell 301-9482) (PDF)
• Two 47nF Y5V ceramic chip 0402 SM capacitors, Phycomp (Farnell 301-9469) (PDF)
• Three 33nF Y5V ceramic chip 0402 SM capacitors, Phycomp (Farnell 301-9547) (PDF)

• One 22nF X7R ceramic chip 0603 SM capacitor, Philips Farnell 301-9755 (PDF)
• One 100nF Y5V ceramic chip 0603 SM 50V. capacitor, Philips Farnell 431-989 (PDF)
• Three 100nF Y5V ceramic chip 0603 SM 50V.capacitors, Philips Farnell 431-989 (PDF)

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