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SR05 Datasheet(PDF) 6 Page - Semtech Corporation

Part No. SR05
Description  RailClamp Low Capacitance TVS Diode Array
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Maker  SEMTECH [Semtech Corporation]
Homepage  http://www.semtech.com

SR05 Datasheet(HTML) 6 Page - Semtech Corporation

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 2000 Semtech Corp.
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:
C = VF(RailClamp) + VTVS
This is given in the data sheet as the rated clamping
voltage of the device. For a SR05 the typical clamping
voltage is <16V at I
The diodes internal to the
RailClamp are low capacitance, fast switching devices
that are rated to handle transient currents and main-
tain excellent forward voltage characteristics.
Universal Serial Bus ESD Protection
The figure below illustrates how to use the SR05 to
protect one upstream USB port and the SRDA05-4 to
protect two downstream USB ports. When the voltage
on the data lines exceed the bus voltage (plus one
diode drop), the internal rectifiers are forward biased
conducting the transient current away from the pro-
tected controller chip. The TVS diode directs the surge
to ground. The TVS diode also acts to suppress ESD
strikes directly on the voltage bus. Thus, both power
and data pins are protected with a single device.
Reference Semtech application note SI96-18 for
further information.

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