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PDF RCLAMP0504N Data sheet ( Hoja de datos )
| Número de pieza | RCLAMP0504N | |
| Descripción | TVS Array | |
| Fabricantes | Semtech Corporation | |
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PROTECTION PRODUCTS - RailClamp
www.DataSheet4U.com
Description
RailClamps are surge rated diode arrays designed to
protect high speed data interfaces. The RClamp series
has been specifically designed to protect sensitive
components which are connected to data and trans-
mission lines from overvoltage caused by electrostatic
discharge (ESD), electrical fast transients (EFT), and
lightning.
The unique design of the RClamp series devices
incorporates eight surge rated, low capacitance steer-
ing diodes and a TVS 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 down-
stream components.
The RClampTM0504N has a low typical capacitance of
3pF and operates with virtually no insertion loss to
1GHz. This makes the device ideal for protection of
high-speed data lines such as USB 2.0, Firewire, DVI,
and gigabit Ethernet interfaces.
The RClamp0504N is in a 6-pin, RoHS compliant,
SLP2020P6 package. It measures 2.0 x 2.0 x
0.60mm. The leads are spaced at a pitch of 0.5mm
and are finished with lead-free NiPdAu. Each device
may be used to protect four high-speed data or trans-
mission lines. They may be used to meet the ESD
immunity requirements of IEC 61000-4-2, Level 4
(±15kV air, ±8kV contact discharge).
RClamp0504N
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) 12A (8/20µs)
Array of surge rated diodes with internal TVS Diode
Small package saves board space
Protects four I/O lines
Low capacitance: 3pF typical
Low clamping voltage
Low operating voltage: 5.0V
Solid-state silicon-avalanche technology
Mechanical Characteristics
SLP2020P6 Package
RoHS/WEEE Compliant
Nominal Dimensions: 2.0 x 2.0 x 0.60 mm
Lead Pitch: 0.65mm
Lead Finish: NiPdAu
Marking : Marking Code and 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)
10/100/1000 Ethernet
Notebook Computers
Circuit Diagram
Package Dimensions
Pin 5
Pin 1
Pin 3
Pin 4
Pin 6
2.00
1
2.00
0.65 BSC
Pin 2
0.60
Device Schematic
Revision 01/16/2008
6 Pin SLP package (Bottom Side View)
Nominal Dimensions in mm
1 www.semtech.com
1 page  
PROTECTION PRODUCTS
Appwlwiwc.aDatitaoSnheset4IUn.cfoomrmation (continued)
PIN Descriptions
RClamp0504N
Figure 2 - The Effects of Parasitic Inductance
When Using Discrete Components to Implement
Rail-To-Rail Protection
Figure 3 - Rail-To-Rail Protection Using
RailClamp TVS Arrays
Therefore, the voltage overshoot due to 1nH of series
inductance is:
V = LP diESD/dt = 1X10-9 (30 / 1X10-9) = 30V
Example:
Consider a VCC = 5V, a typical VF of 30V (at 30A) for the
steering diode and a series trace inductance of 10nH.
The clamping voltage seen by the protected IC for a
positive 8kV (30A) ESD pulse will be:
VC = 5V + 30V + (10nH X 30V/nH) = 335V
This does not take into account that the ESD current is
directed into the supply rail, potentially damaging any
components that are attached to that rail. Also note
that it is not uncommon for the VF of discrete diodes to
exceed the damage threshold of the protected IC. This
is due to the relatively small junction area of typical
discrete components. It is also possible that the
power dissipation capability of the discrete diode will
be exceeded, thus destroying the device.
The RailClamp is designed to overcome the inherent
disadvantages of using discrete signal diodes for ESD
suppression. The RailClamp’s integrated TVS diode
helps to mitigate the effects of parasitic inductance in
the power supply connection. During an ESD event,
the current will be directed through the integrated TVS
diode to ground. The maximum voltage seen by the
protected IC due to this path will be the clamping
voltage of the device.
ETHERNET PROTECTION
Ethernet ICs are vulnerable to damage from electro-
static discharge (ESD), lightning, and cable discharge
events (CDE). The internal protection in the PHY chip,
if any, often is not enough due to the high energy of
these disturbances. The fatal discharge can occur
differentially across the transmit or receive line pair or
between any line and ground (common mode).
Common mode and differential mode protection
against ESD and CDE discharges can be achieved by
connecting the RClamp0504N on the PHY side of the
Ethernet circuit as shown in Figure 4. Pins 1, 3, 4, and
6 are connected to the transmit and receive line pairs.
Since there is no Vcc connection at the connector, pin
5 of the RClamp0504N should not be connected. Pin
2 is connected to ground. This connection should be
made directly to the ground plane. All path lengths
should be kept as short as possible to minimize para-
sitic inductance. This configuration can be used to
meet the ESD immunity requirements of IEC 61000-4-
2 and cable discharge events.
2008 Semtech Corp.
5
www.semtech.com
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| Páginas | Total 9 Páginas | |
| PDF Descargar | [ Datasheet RCLAMP0504N.PDF ] | |
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