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PDF SR05 Data sheet ( Hoja de datos )
| Número de pieza | SR05 | |
| Descripción | RailClamp Low Capacitance TVS Diode Array | |
| Fabricantes | Semtechoration | |
| Logotipo |  |
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Hay una vista previa y un enlace de descarga de SR05 (archivo pdf) en la parte inferior de esta página. Total 9 Páginas | ||
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PROTECTION PRODUCTS
Description
RailClamps are surge rated diode arrays designed to
protect high speed data interfaces. The SR series has
been specifically designed to protect sensitive compo-
nents which are connected to data and transmission
lines from overvoltage caused by ESD (electrostatic
discharge), EFT (electrical fast transients), and light-
ning.
The unique design of the SR series devices incorpo-
rates four 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 compo-
nents.
The low capacitance array configuration allows the user
to protect two high-speed data or transmission lines.
The low inductance construction minimizes voltage
overshoot during high current surges.
SR05
RailClamp
Low Capacitance TVS Diode Array
Features
! ESD protection to IEC 61000-4-2, Level 4
! Array of surge rated diodes with internal TVS Diode
! Protects two I/O lines
! Low capacitance (<10pF) for high-speed interfaces
! Low clamping voltage
! Low operating voltage: 5.0V
! Solid-state silicon-avalanche technology
Mechanical Characteristics
! JEDEC SOT-143 package
! UL 497B listed
! Molding compound flammability rating: UL 94V-0
! Marking : R05
! Packaging : Tape and Reel per EIA 481
Applications
! USB Power & Data Line Protection
! Ethernet 10BaseT
! I2C Bus Protection
! Video Line Protection
! T1/E1 secondary IC Side Protection
! Portable Electronics
! Microcontroller Input Protection
! WAN/LAN Equipment
! ISDN S/T Interface
Circuit Diagram
Pin 4
Pin 2
Pin 3
Schematic & PIN Configuration
4
1
Revision 9/2000
Pin 1
23
SOT-143 (Top View)
1 www.semtech.com
1 page  
SR05
PROTECTION PRODUCTS
Applications Information (continued)
For negative events, the bottom diode will be biased
when the voltage exceeds the VF of the diode. At first
approximation, the clamping voltage due to the charac-
teristics of the protection diodes is given by:
VPCIN= VDCCe+scVrFipt(ifoonr spositive duration pulses)
VC = -VF
(for negative duration pulses)
However, for fast rise time transient events, the
effects of parasitic inductance must also be consid-
ered as shown in Figure 2. Therefore, the actual
clamping voltage seen by the protected circuit will be:
VC = VCC + VF + LP diESD/dt (for positive duration pulses)
VC = -VF - LG diESD/dt
(for negative duration pulses)
ESD current reaches a peak amplitude of 30A in 1ns
for a level 4 ESD contact discharge per IEC 1000-4-2.
Therefore, the voltage overshoot due to 1nH of series
inductance is:
Figure 1 - “Rail-To-Rail” Protection Topology
(First Approximation)
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.
Figure 2 - The Effects of Parasitic Inductance
When Using Discrete Components to Implement
Rail-To-Rail Protection
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
Figure 3 - Rail-To-Rail Protection Using
RailClamp TVS Arrays
2000 Semtech Corp.
5
www.semtech.com
5 Page | ||
| Páginas | Total 9 Páginas | |
| PDF Descargar | [ Datasheet SR05.PDF ] | |
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