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PDF RCLAMP3354S Data sheet ( Hoja de datos )
| Número de pieza | RCLAMP3354S | |
| Descripción | Low Voltage RClamp Surge Protection | |
| Fabricantes | Semtech | |
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RClamp®3354S
Low Voltage RClamp®
Surge Protection for GbE Interfaces
PROTECTION PRODUCTS - RailClamp®
Description
RailClamp® TVS diodes are specifically designed to
protect sensitive components which are connected to
high-speed data and transmission lines from
overvoltage caused by ESD (electrostatic discharge),
CDE (cable discharge events), and EFT (electrical fast
transients).
The RClamp®3354S incorporates surge rated, low
capacitance steering diodes and a TVS diode in a single
package. Each device will protect up to four high-speed
lines. The RClamp3354S can withstand a high level of
surge current (25A, 8/20us) while maintaining a low
loading capacitance of less than 5pF. The high surge
capability means it can be used in high threat environ-
ments in applications such as Gigabit Ethernet, telecom-
munication lines, and LVDS interfaces.
The RClamp3354S is constructed using Semtech’s pro-
prietary EPD process technology. The EPD process pro-
vides low stand-off voltages with significant reductions in
leakage current and capacitance over silicon-avalanche
diode processes. It features a low operating voltage of
3.3 volts for superior protection.
The RClamp3354S is in a 5-lead SOT-23 package. The
leads are finished with lead-free matte tin.
Features
u Transient protection for high-speed data lines to
IEC 61000-4-2 (ESD) 30kV (air), 30kV (contact)
IEC 61000-4-4 (EFT) 40A (5/50ns)
IEC 61000-4-5 (Lightning) 25A (8/20µs)
u Array of surge rated diodes with internal TVS Diode
u Protects up to four I/O lines
u Low capacitance (<5pF) for high-speed interfaces
u Low Dynamic Resistance: 0.25 Ohms
u Low operating voltage: 3.3V
u Solid-state silicon-avalanche technology
Mechanical Characteristics
u JEDEC SOT-23 5L package
u Pb-Free, Halogen Free, RoHS/WEEE Compliant
u Molding compound flammability rating: UL 94V-0
u Marking : Marking code + date code
u Packaging : Tape and Reel
Applications
u 10/100/1000 Ethernet
u Central Office Equipment
u LVDS Interfaces
u MagJacks / Integrated Magnetics
u Notebooks / Desktops / Servers
Circuit Diagram
Pin Configuration
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Free Datasheet http://www.datasheet4u.com/
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PROTECTION PRODUCTS
Applications Information
Gigabit Ethernet Protection Solutions
Ethernet systems with connections external to the build-
ing are subject to high-level transient threats. This type
of equipment may even be required to meet the surge
immunity requirements of Telcordia GR-1089. Reli-
able protection of the Ethernet transceiver requires a
device that can absorb the expected transient energy,
clamp the incoming surge to a safe level, and yet remain
transparent to the system under normal operation. The
RClamp3354S has been designed to meet these de-
manding requirements.
Transient Protection
When designing Ethernet protection, the entire system
must be considered. An Ethernet port includes interface
magnetics in the form of transformers and common
mode chokes. Transformers and chokes can be discrete
components, but integrated solutions that include the
RJ-45 connector, resistors, capacitors, and protection
are also available. In either case, the transformer will
provide a high level of common mode isolation to exter-
nal voltages, but no protection for metallic (line-to-line)
surges. During a metallic transient event, current will
flow into one line, through the transformer and back to
the source. As the current flows, it charges the windings
of the transformer on the line side. Once the surge is
removed, the windings on the line side will stop charging
and will transfer its stored energy to the IC side where
the PHY IC is located. The magnitude and duration of
the surge is attenuated by the inductance of the mag-
netics. The amount of attenuation will vary by vendor
and configuration of the magnetics. It is this transferred
energy that must be clamped by the protection circuitry.
RClamp3354S
2013. Semtech Corporation.
5
www.semtech.com
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| Páginas | Total 7 Páginas | |
| PDF Descargar | [ Datasheet RCLAMP3354S.PDF ] | |
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