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BZA420A Datasheet(PDF) 7 Page - NXP Semiconductors

Part No. BZA420A
Description  Quadruple ESD transient voltage suppressor
Download  12 Pages
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Maker  PHILIPS [NXP Semiconductors]
Homepage  http://www.nxp.com
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BZA420A Datasheet(HTML) 7 Page - NXP Semiconductors

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1999 May 20
7
Philips Semiconductors
Product specification
Quadruple ESD transient voltage suppressor
BZA420A
Device placement and printed-circuit board layout
Circuit board layout is of extreme importance in the
suppression of transients. The clamping voltage of the
BZA420A is determined by the peak transient current and
the rate of rise of that current (di/dt). Since parasitic
inductances can further add to the clamping voltage
(V = L di/dt) the series conductor lengths on the
printed-circuit board should be kept to a minimum. This
includes the lead length of the suppression element.
In addition to minimizing conductor length the following
printed-circuit board layout guidelines are recommended:
1. Place the suppression element close to the input
terminals or connectors
2. Keep parallel signal paths to a minimum
3. Avoid running protection conductors in parallel with
unprotected conductors
4. Minimize all printed-circuit board loop areas including
power and ground loops
5. Minimize the length of the transient return path to
ground
6. Avoid using shared transient return paths to a common
ground point.


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