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SRDA05-4 and SRDA12-4
PROTECTION PRODUCTS
Applications Information (continued)
the power supply connection. During an ESD event,
the current will be directed through the integrated TVS
diode to ground. The total clamping voltage seen by
the protected IC due to this path will be:
V =V
C
F(RailClamp)
+V
TVS
internal to the RailClamp are low capacitance, fast
This is given in the data sheet as the rated clamping
voltage of the device. For an SRDA05-4 the typical
clamping voltage is <16V at I =30A. The diodes
PP
switching devices that are rated to handle high tran-
sient currents and maintain excellent forward voltage
characteristics.
Using the RailClamp does not negate the need for good
board layout. All other inductive paths must be consid-
ered. The connection between the positive supply and
the SRDA and from the ground plane to the SRDA
must be kept as short as possible. The path between
the SRDA and the protected line must also be mini-
mized. The protected lines should be routed directly to
the SRDA. Placement of the SRDA on the PC board is
also critical for effective ESD protection. The device
should be placed as close as possible to the input
connector. The reason for this is twofold. First,
inductance resists change in current flow. If a signifi-
cant inductance exists between the connector and the
TVS, the ESD current will be directed elsewhere (lower
resistance path) in the system. Second, the effects of
radiated emissions and transient coupling can cause
upset to other areas of the board even if there is no
direct path to the connector. By placing the TVS close
to the connector it will divert the ESD current immedi-
ately and absorb the ESD energy before it can be
coupled into nearby traces.
? 2007 Semtech Corp.
7
www.semtech.com
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相关PDF资料
SRDA05-4R2G TVS ARRAY LO CAP 500W 8-SOIC
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相关代理商/技术参数
SRDA05-4.TBT 制造商:Semtech Corporation 功能描述:TVS DIODE
SRDA05-4.TBT-CUT TAPE 制造商:SEMTECH 功能描述:SRDA Series 20 V 8 pF SMT RailClamp?Low Capacitance TVS Diode Array - SOIC-8
SRDA05-4.TE 制造商:Semtech Corporation 功能描述:
SRDA05-4BTG 功能描述:TVS二极管阵列 4CH 30A 5V 8pF Lightning Protection RoHS:否 制造商:Littelfuse 极性: 通道:4 Channels 击穿电压: 钳位电压:11.5 V 工作电压:2.5 V 峰值浪涌电流:20 A 安装风格:SMD/SMT 端接类型:SMD/SMT 系列: 最小工作温度:- 40 C 最大工作温度:+ 85 C
SRDA05-4R2 功能描述:TVS二极管阵列 6V 500W 8pF 4 Line RoHS:否 制造商:Littelfuse 极性: 通道:4 Channels 击穿电压: 钳位电压:11.5 V 工作电压:2.5 V 峰值浪涌电流:20 A 安装风格:SMD/SMT 端接类型:SMD/SMT 系列: 最小工作温度:- 40 C 最大工作温度:+ 85 C
SRDA05-4R2/D 制造商:未知厂家 制造商全称:未知厂家 功能描述:Low Capacitance Surface Mount TVS for High-Speed Data Interfaces
SRDA05-4R2G 功能描述:TVS二极管阵列 LO CAPACITANCE SURF MNT TVS RoHS:否 制造商:Littelfuse 极性: 通道:4 Channels 击穿电压: 钳位电压:11.5 V 工作电压:2.5 V 峰值浪涌电流:20 A 安装风格:SMD/SMT 端接类型:SMD/SMT 系列: 最小工作温度:- 40 C 最大工作温度:+ 85 C
SRDA05-4T 制造商:Semtech Corporation 功能描述:ESD Suppressor Diode Arrays 制造商:Semtech Corporation 功能描述:TVS Diode