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RClamp0502A
RailClamp®®
®®
®
Low Capacitance TVS Array
PROTECTION PRODUCTS - RailClamp®®
®®
®
Description Features
Circuit Diagram Schematic & PIN Configuration
Revision 06/28/2008
The RailClamp® series consists of ultra low capacitance
TVS arrays designed to protect high speed data inter-
faces. This series has been 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).
They are designed for use in applications where board
space is at a premium. Each device requires less than
2.9mm2 of PCB area and will protect two high speed
data lines.
The monolithic design incorporates surge rated, low
capacitance steering diodes and a TVS diode in a single
package. Each line has a typical capacitance of 0.9pF to
ground and 0.3pF between lines. The capacitance of
each line is well matched for consistant signal balance.
Signal integrity is further preserved with the flow through
design. A connection to the TVS is provided for protec-
tion of external voltage busses, such as those found in
USB applications. This device is optimized for ESD
protection of portable electronics. They may be used to
meet the ESD immunity requirements of IEC 61000-4-2,
Level 4 (±15kV air, ±8kV contact discharge).
The RClamp0502A is in a 6-pin, RoHS/WEEE compli-
ant, SC-89 (SOT-666) package. It measures 1.6 x 1.6
x 0.6mm. The leads are finished with lead-free matte
tin. The small package makes it ideal for use in por-
table electronics such as cell phones, laptops, and
digital still cameras.
Applications
Mechanical Characteristics
USB 2.0 High Speed
10/100/1000 Ethernet Ports
High-Definition Multimedia Interface (HDMI)
Digital Visual Interface (DVI)
Monitors and Flat Panel Displays
Video Graphics Cards
IEEE 1394 Firewire Ports High Speed
Transient protection for high-speed data lines to
IEC 61000-4-2 (ESD) ±15kV (air), ±8kV (contact)
IEC 61000-4-4 (EFT) 40A (5/50ns)
Flow through design for ease of layout for high
speed data line application
Protects up to two I/O lines & power line
Low capacitance (<0.9pF) for high-speed interfaces
Ultra-small package requires less than 2.9mm2 of
PCB area
Low leakage current and clamping voltage
Low operating voltage: 5.0V
Solid-state silicon-avalanche technology
SC-89 (SOT-666) package
RoHS/WEEE Compliant
Lead Finish: matte tin
Molding compound flammability rating: UL 94V-0
Marking: A
Packaging: Tape and Reel
SC-89 6L (Top View)
Pin 1 & 6
Pin 3 & 4
Pin 2
Pin 5
2
1
34
5
6
2© 2008 Semtech Corp. www.semtech.com
PROTECTION PRODUCTS
RClamp0502A
Absolute Maximum Rating
Electrical Characteristics (T=25oC)
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Note 1: Between any I/O and GND
3
© 2008 Semtech Corp. www.semtech.com
PROTECTION PRODUCTS
RClamp0502A
Typical Characteristics
Non-Repetitive Peak Pulse Power vs. Pulse Time Power Derating Curve
0
10
20
30
40
50
60
70
80
90
100
110
0 25 50 75 100 125 150
Ambien t Temperat ure - T A (oC)
% of Rated Power or IPP
Clamping Voltage vs. Peak Pulse Current
I/O to Gnd - Pin 1, 3, 4, 6 to Pin 2
Normalized Capacitance vs. Reverse Voltage
I/O to Gnd - Pin 1, 3, 4, or 6 to Pin 2
0
0.2
0.4
0.6
0.8
1
1.2
1.4
012345
Reverse Vo ltage - VR (V)
NormalizedCapacitance - Cj
f = 1 MHz
Clamping Voltage vs. Peak Pulse Current
I/O to I/O
Normalized Capacitance vs. Reverse Voltage
I/O to I/O
0.2
0.4
0.6
0.8
1
1.2
012345
Reverse Voltage - VR (V)
Normalized Capacitance - Cj
f = 1 MHz
0
2
4
6
8
10
12
14
16
01234
Peak Pulse Current - IPP (A)
Clamping Voltage - VC (V)
Waveform
Parameters:
tr = 8µs
td = 20µs
0
5
10
15
20
01234
Peak Pulse Current - Ipp (A)
Clamping Voltage - VC (V)
Waveform
Parameters:
tr = 8µs
td = 20µs
0.01
0.1
1
10
0.1 1 10 100 1000
Pulse Duration - tp (µs)
Peak Pul se Po wer - PPP (kW)
4© 2008 Semtech Corp. www.semtech.com
PROTECTION PRODUCTS
RClamp0502A
Insertion Loss S21 (I/O to I/O) Insertion Loss S21 (I/O to Gnd)
Typical Characteristics
1 2
3
START
. 030 MHz 3
STOP 000
. 000 000 MHz
CH1 S21 LOG 6 dB / REF 0 dB
1: .00460 dB
900 MHz
2: .02010 dB
1.8 GHz
3: -.08180 dB
2.5 GHz
0 dB
-6 dB
-12 dB
-18 dB
-24 dB
-30 dB
-36 dB 1
GHz
100
MHz 3
GHz
10
MHz
1
MHz
1 2
3
START
. 030 MHz 3
STOP 000
.
000 000 MHz
CH1 S21 LOG 6 dB / REF 0 dB
1: .03430 dB
900 MHz
2: .07870 dB
1.8 GHz
3: .28040 dB
2.5 GHz
0 dB
-6 dB
-12 dB
-18 dB
-24 dB
-30 dB
-36 dB 1
GHz
100
MHz 3
GHz
10
MHz
1
MHz
ESD Response (4kV Contact per IEC 61000-4-2) ESD Response (8kV Contact per IEC 61000-4-2)
Note: Data is taken with a 10x attenuator Note: Data is taken with a 10x attenuator
5
© 2008 Semtech Corp. www.semtech.com
PROTECTION PRODUCTS
RClamp0502A
Applications Information
Device Connection Options for Protection of Two
High-Speed Data Lines
This device is designed to protect data lines by
clamping them to a fixed reference. When the voltage
on the protected line exceeds the reference voltage
the steering diodes are forward biased, conducting the
transient current away from the sensitive circuitry.
Data lines are connected at pins 1 & 6 and pins 3 & 4.
Pins 5 and 2 can be connected to ground or Vcc based
on application and location of those connections. The
connection to ground should be made directly to a
ground plane. The path length should also be kept as
short as possible to minimize parasitic inductance.
Figure 1 shows the layout configuration to send data
input at pins 6 and 4 and output at pins 1 and 3.
This device is designed for ease of PCB layout by
allowing the traces run straight through the device.
Figure 2 shows the proper way to design the PCB
board trace in order to use the flow through layout for
two line pairs. The solid line represents the PCB trace.
Note the PCB traces are used to connect the pin pairs
for each I/O (pin 1 to pin 6 and pins 3 to pin 4). For
example, I/O 1 enters at pin 6 and exits at pin 1 and
the PCB trace connects pins 6 and 1 together. This is
also true for I/O 2. The negative reference (Gnd) is
connected at pin 2. The positive reference is
connected at pin 5.
Universal Serial Bus ESD Protection
The RClamp0502A may also be used to protect both
upstream and downstream USB ports on monitors,
computers, peripherals or portable systems. Each
device will protect up to one USB port (Figure 3). 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 protected 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.
Figure 1. Protection of Two Data Lines
and One Power Supply Line
Figure 2. Flow Through Layout for
Two Data Lines and one Power Line
Figure 3. USB 2.0 (up to 480Mbps)
Upstream or Downstream Port Protection
2
1
34
5
6
Vcc
Gnd
D+
D-
D+
to protected Circuit
D-
to protected Circuit
6© 2008 Semtech Corp. www.semtech.com
PROTECTION PRODUCTS
RClamp0502A
Applications Information - Spice Model
RClamp0502A Spice Model
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© 2008 Semtech Corp. www.semtech.com
PROTECTION PRODUCTS
RClamp0502A
Outline Drawing - SC-89 (SOT-666)
Land Pattern - SC-89 (SOT-666)
INCHES
.063
N
c
E1
E
L
D .059
.043
DIM
AMIN
.019
1.70
1.25
1.50
1.10
6
-
.008
.063
.047
.067
.049
6
-
0.20
1.60
1.20
1.60
MILLIMETERS
MAX
0.60
MIN
DIMENSIONS
MAXNOM
-.024 NOM
0.50 -
1
A
B
C
CONTROLLING DIMENSIONS ARE IN MILLIMETERS (ANGLES IN DEGREES).
NOTES:
OR GATE BURRS.
DIMENSIONS "E1" AND "D" DO NOT INCLUDE MOLD FLASH, PROTRUSIONS
2.
1.
1.701.55.061 .067
0.300.10.012.003
L1 .003 .006 0.150.10.008 0.20
b .005 --
0.15.012 0.30
e.020 BSC 0.50 BSC
0.180.10.007.003
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NOTES:
1. THIS LAND PATTERN IS FOR REFERENCE PURPOSES ONLY
CONSULT YOUR MANUFACTURING GROUP TO ENSURE YOUR
COMPANY'S MANUFACTURING GUIDELINES ARE MET.
DIM
Y
Z
G
X
CMILLIMETERSINCHES (1.45)
.033
.090
.012
.024
(.057)
0.85
2.30
0.30
0.60
DIMENSIONS
Z
X
Y
CG
Y
P 0.50.020
P
8© 2008 Semtech Corp. www.semtech.com
PROTECTION PRODUCTS
RClamp0502A
Contact Information
Semtech Corporation
Protection Products Division
200 Flynn Rd., Camarillo, CA 93012
Phone: (805)498-2111 FAX (805)498-3804
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Ordering Information
Tape and Reel Specification
RailClamp and RClamp are registered marks of Semtech Corporation
Marking
A
Tape Specification and Device Orientation
AA A
