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參數(shù)資料
| 型號(hào)： | 934055171115 |
| 廠商： | NXP SEMICONDUCTORS |
| 元件分類： | TVS二極管 - 瞬態(tài)電壓抑制 |
| 英文描述： | 20 W, BIDIRECTIONAL, 4 ELEMENT, SILICON, TVS DIODE |
| 封裝： | PLASTIC, SMD, SMT6, SSOT6, SC-74, TSOP-6 |
| 文件頁(yè)數(shù)： | 9/12頁(yè) |
| 文件大?。?/td> | 74K |
| 代理商： | 934055171115 |
1998 Oct 15
6
Philips Semiconductors
Product specication
Quadruple bidirectional ESD transient
voltage suppressor
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.
Fig.6 Scart connector protection.
handbook, full pagewidth
MGR559
BZA408B
GND
SCART
CONNECTOR
TVSET/VCR
audio in L
audio in R
audio out L
audio out R
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.
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