BZA408B 查看數據表（PDF） - NXP Semiconductors.
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BZA408B Datasheet PDF : 10 Pages
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NXP Semiconductors
Quadruple bidirectional ESD transient
voltage suppressor
Product data sheet
BZA408B
APPLICATION INFORMATION
Typical bidirectional application
A quadruple bidirectional transient suppressor in a SOT457 package makes it possible to protect four separate lines
using only one package. One simplified example is shown in Fig.6.
handbook, full pagewidth
audio in L
audio in R
audio out L
audio out R
SCART
CONNECTOR
TVSET/VCR
BZA408B
GND
MGR559
Fig.6 Scart connector protection.
Device placement and printed-circuit board layout
Circuit board layout is of extreme importance in the suppression of transients. The clamping voltage of the BZA408B 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.
1998 Oct 15
6
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