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PDF RClamp0554S Data sheet ( Hoja de datos )
| Número de pieza | RClamp0554S | |
| Descripción | Low Capacitance TVS Diode Array | |
| Fabricantes | Semtech | |
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PROTECTION PRODUCTS - RailClamp®
Description
A RailClamp® is a low capacitance TVS array designed
to protect high speed data interfaces. This series has
been specifically designed to protect sensitive compo-
nents which are connected to data and transmission
lines from overvoltage caused by electrostatic dis-
charge (ESD), electrical fast transients (EFT), and
lightning.
The unique design incorporates eight surge rated, low
capacitance steering diodes and a TVS diode in a
single package. During transient conditions, the
steering diodes direct the transient to either the
positive side of the power supply line or to ground. The
internal TVS diode prevents over-voltage on the power
line, protecting any downstream components.
The RClamp®0554S is in a 6-lead SOT-23 package.
The leads are finished with lead-free matte tin. Each
device will protect up to four high-speed lines. They
may be used to meet the ESD immunity requirements
of IEC 61000-4-2, Level 4 (15kV air, 8kV contact
discharge). The combination of small size, low capaci-
tance, and high surge capability makes them ideal for
use in applications such as 10/100 Ethernet, USB 2.0,
and video interfaces.
RClamp0554S
RailClamp®
Low Capacitance TVS Diode Array
Features
ESD protection for high-speed data lines to
IEC 61000-4-2 (ESD) ±15kV (air), ±8kV (contact)
IEC 61000-4-4 (EFT) 40A (5/50ns)
IEC 61000-4-5 (Lightning) 25A (8/20μs)
Array of surge rated diodes with internal TVS Diode
Small package saves board space
Protects four I/O lines and Voltage Bus
Low capacitance: 5pF (VR=0V)
Low clamping voltage
Low operating voltage: 5.0V
Solid-state silicon-avalanche technology
Mechanical Characteristics
JEDEC SOT-23 6L package
Pb-Free, Halogen Free, RoHS/WEEE Compliant
Molding compound flammability rating: UL 94V-0
Marking : Marking code + date code
Packaging : Tape and Reel
Applications
USB 2.0 Power and Data Line Protection
Video Graphics Cards
Monitors and Flat Panel Displays
Digital Video Interface (DVI)
Notebook Computers
IEEE 1394 Firewire Ports
Circuit Diagram
Schematic and PIN Configuration
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13
46
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Revision 10/21/2009
1
SOT-23 6L (Top View)
www.semtech.com
1 page  
RClamp0554S
PROTECTION PRODUCTS
Applications Information
Device Connection Options for Protection of Four
High-Speed Data Lines
The RClamp0554S is designed to protect four data
lines from transient over-voltages by clamping them to
a fixed reference. When the voltage on the protected
line exceeds the reference voltage (plus diode VF) the
steering diodes are forward biased, conducting the
transient current away from the sensitive circuitry.
Data lines are connected at pins 1, 3, 4 and 6. The
negative reference (REF1) is connected at pin 2. This
pin should be connected directly to a ground plane on
the board for best results. The path length is kept as
short as possible to minimize parasitic inductance.
The positive reference (REF2) is connected at pin 5.
The options for connecting the positive reference are
as follows:
1. To protect data lines and the power line, connect
pin 5 directly to the positive supply rail (VCC). In this
configuration the data lines are referenced to the
supply voltage. The internal TVS diode prevents
over-voltage on the supply rail.
2. The RClamp0554S can be isolated from the power
supply by adding a series resistor between pin 5
and VCC. A value of 100kΩ is recommended. The
internal TVS and steering diodes remain biased,
providing the advantage of lower capacitance.
3. In applications where no positive supply reference
is available, or complete supply isolation is desired,
the internal TVS may be used as the reference. In
this case, pin 5 is not connected. The steering
diodes will begin to conduct when the voltage on
the protected line exceeds the working voltage of
the TVS (plus one diode drop).
Data Line and Power Supply Protection Using Vcc as
reference
Data Line Protection with Bias and Power Supply
Isolation Resistor
Data Line Protection Using Internal TVS Diode as
Reference
ESD Protection With RailClamps®
RailClamps are optimized for ESD protection using the
rail-to-rail topology. Along with good board layout,
these devices virtually eliminate the disadvantages of
using discrete components to implement this topology.
Consider the situation shown in Figure 1 where dis-
crete diodes or diode arrays are configured for rail-to-
rail protection on a high speed line. During positive
duration ESD events, the top diode will be forward
biased when the voltage on the protected line exceeds
© 2009 Semtech Corp.
5
www.semtech.com
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| PDF Descargar | [ Datasheet RClamp0554S.PDF ] | |
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