AN9768 Datasheet, PDF (8/8 Pages) Littelfuse – Transient Suppression Devices and Principles

Application Note 9768
As a rule the source impedance of the signal and the
frequency as well as the capacitance of the transient
suppressor should be considered.
The current through C_P is a function of dv/dt and the
distortion is a function of the signal's source impedance.
Each case must be evaluated individually to determine the
maximum allowable capacitance.
The structural characteristics of metal-oxide varistors
unavoidably result in an appreciable capacitance between
the device terminals, depending on area, thickness and
material processing. For the majority of power applications,
this capacitance can be of benefit. In high-frequency
applications, however, the effect must be taken into
consideration in the overall system design.
References
For Littelfuse documents available on the web, see
http://www.littelfuse.com/
[1] Sakshaug, E.C., J.S. Kresge and S.A. Miske, “A New
Concept in Station Arrester Design,” IEEE Trans.
PAS-96, No. 2, March-April 1977, pp. 647-656.
[2] Philipp, H.R. and L.M. Levinson, “Low Temperature
Electrical Studies in Metal Oxide Varistors - A Clue to
Conduction Mechanisms,” Journal of Applied Physics,
Vol. 48, April 1977, pp. 1621-1627.
[3] Philipp, H.R. and L.M. Levinson, “Zinc Oxide for
Transient Suppression,” IEEE Trans. PHP, December
1977.
[4] “Surge Arresters for Alternating Current Power Circuits,”
ANSI Standard C62.1, IEEE Standard 28.
[5] “Lightning Arresters. Part I: Nonlinear Resistor Type
Arresters for AC Systems,” IEC Recommendation
99-1,1970.
[6] Matsuoka, M., T. Masuyama and Y. Iida, “Supplementary
Journal of Japanese Society of Applied Physics,” Vol.
39, 1970, pp. 94-101.
[7] Harnden, J.D., F.D. Martzloff, W.G. Morris and F.B.
Golden, “Metal-Oxide Varistor: A New Way to Suppress
Transients,” Electronics, October 2, 1972.
[8] Martzloff, F.D., “The Development of a Guide on Surge
Voltages in Low - Voltage AC Power Circuits,” Report
81CRD047, General Electric, Schenectady, New York,
1981.
[9] Martzloff, F.D., “Varistor versus Environment: Winning
the Rematch,” Report 85CRD037, General Electric,
Schenectady, New York, May 1985.
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