1www.semtech.com
PROTECTION PRODUCTS - RailClamp®®
®®
®
RClamp0502N
RailClamp®®
®®
®
Low Capacitance TVS Diode Array
Description Features
Circuit Diagram Pin Configuration
Revision 09/19/2008
The RailClamp® series is a family of ultra low capaci-
tance TVS arrays designed to protect high speed data
interfaces. 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
1.2mm2 of PCB area and will protect up to 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
<0.5pF to ground. The capacitance of each line is well
matched for consistant signal balance. A connection
to the TVS is provided for protection of external
voltage buses, such as those found in USB applica-
tions. 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 RClamp0502N is in a 6-pin, RoHS/WEEE compli-
ant, SLP1210N6 package. It measures 1.2 x 1.0 x
0.58mm. The small package makes it ideal for use in
portable electronics such as cell phones, laptops, and
digital still cameras.
Applications
Mechanical Characteristics
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)
Array of surge rated diodes with internal TVS Diode
Small package saves board space
Protects two I/O lines and a power line
Low capacitance: 0.3pF typical
Low clamping voltage
Solid-state silicon-avalanche technology
SLP1210N6 Package
RoHs/WEEE Compliant
Nominal Dimensions: 1.2 x 1.0 x 0.58 mm
Lead Pitch: 0.4mm
Lead Finish: NiPdAu
Marking : Marking Code
Packaging : Tape and Reel
SLP1210N6 package (Top Side View)
Device Schematic
USB
MMC Port
Serial ATA
Video Port
GND (Pin 1)
NC (Pin 2)
NC (Pin 3) I/O 1 (Pin 4)
VBus (Pin 6)
I/O 2 (Pin 5)
6
145
2© 2008 Semtech Corp. www.semtech.com
PROTECTION PRODUCTS
RClamp0502N
Absolute Maximum Rating
Electrical Characteristics (T = 25oC)
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3© 2008 Semtech Corp. www.semtech.com
PROTECTION PRODUCTS
RClamp0502N
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
Ambient Temperat ure - TA (oC)
% of Rated Power or I
PP
Foward Voltage vs. Forward Current
Pin 1 to Pin 4, 5
Clamping Voltage vs. Peak Pulse Current
I/O to Gnd - Pin 4, 5 to Pin 1
Normalize Capacitance vs. Reverse Voltage
I/O to Gnd - Pin 4, 5 to Pin 1
0.01
0.1
1
10
0.1 1 10 100 1000
Pulse Duration - tp (µs)
Peak Pulse Power - PPk (kW)
0
5
10
15
20
25
30
35
40
00.511.522.533.54
Peak Pulse Current - IPP (A)
Clamping Voltage - VC (V)
Waveform
Parameters:
tr = 8μs
td = 20μs
0
1
2
3
4
5
6
7
8
00.511.522.533.54
Forward Current - IF (A)
Forward Voltage - VF V)
Waveform
Parameters:
tr = 8μs
td = 20μs
0
0.2
0.4
0.6
0.8
1
1.2
1.4
1.6
01234567
Reverse Voltage - VR (V)
CJ(VR) / CJ(VR=0)
f = 1 MHz
Normalize Capacitance vs. Reverse Voltage
I/O to I/O - Pin 4 to Pin 5
0
0.2
0.4
0.6
0.8
1
1.2
1.4
1.6
01234567
Reverse Voltage - VR (V)
CJ(VR) / CJ(VR=0)
f = 1 MHz
4© 2008 Semtech Corp. www.semtech.com
PROTECTION PRODUCTS
RClamp0502N
Device Connection Options for Protection of Two High-
Speed Data Lines
Data line inputs are normally connected at pins 4 & 5
with the outputs connected at pins 2 & 3. Pin 1 is
connected to ground. Note that the circuit at the ground
pin is identical to the circuit at each data input/output
pin. This is done to further reduce capacitance. 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. Pin
6 can be connected to Vcc biased or left not connected
depending upon the application.
Protecting USB 2.0 Interfaces
The USB interface consists of Data (D- and D+) lines and
a 5.25V voltage bus. Since these pins are part of the
connector, they are vulnerable to ESD and cable
discharge events. The RClamp0502N is designed to
protect all four USB connections (VCC, D-, D+, and Gnd).
Each device will protect one USB port. 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.
Applications Information
Figure 1- Pin Configuration & Circuit Diagram
Figure 2 - USB 2.0 High Speed Protection
6
145
Gnd
Vbus
D-
D+
USB Connector
USB Controller
Pin 1
D+
D- Pin 2
Pin 3 Pin 4
Pin 5
Pin 6
GND (Pin 1)
NC (Pin 2)
NC (Pin 3) D+ or D- (Pin 4)
VBus (Pin 6)
D+ or D- (Pin 5)
5© 2008 Semtech Corp. www.semtech.com
PROTECTION PRODUCTS
RClamp0502N
Figure 3 - RClamp0502N Spice Model
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Applications Information - Spice Model
6© 2008 Semtech Corp. www.semtech.com
PROTECTION PRODUCTS
RClamp0502N
Outline Drawing - SO-8
Land Pattern -SLP1210N6
Outline Drawing -SLP1210N6
1.00
.039
E
1.301.10
.051.043
0.90 1.10
.043.035
E
DA
A2
aaa C
A1
PIN 1
INDICATOR
(LASER MARK)
B
A
C
SEATING
PLANE
12
D/2
E/2
INCHES
.016 BSC
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L
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D
.012
DIM
A1
A2
A
MIN
0.00
.020
0.250.15.010 0.20.008
0.4250.30
.004
.003
6
.015
.047
.017
0.08
0.10
6
0.38
1.20
0.40 BSC
MILLIMETERS
MAX
0.05
0.65
DIMENSIONS
MIN
0.00
NOM
(.005)
.023
.001
MAX
.002
.026
NOM
0.50
0.03
(0.13)
0.58
CONTROLLING DIMENSIONS ARE IN MILLIMETERS (ANGLES IN DEGREES).
NOTES:
1.
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ebbb C A B
LxN
THIS LAND PATTERN IS FOR REFERENCE PURPOSES ONLY.
CONSULT YOUR MANUFACTURING GROUP TO ENSURE YOUR
NOTES:
2.
DIM
X
Y
P
G
C
MILLIMETERSINCHES
(0.875)
.008
.027
.008
.016
(.034)
0.20
0.675
0.40
0.20
DIMENSIONS
COMPANY'S MANUFACTURING GUIDELINES ARE MET.
1.55.061Z
1. CONTROLLING DIMENSIONS ARE IN MILLIMETERS (ANGLES IN DEGREES).
P
Z
X
Y
G
(C)
7© 2008 Semtech Corp. www.semtech.com
PROTECTION PRODUCTS
RClamp0502N
Contact Information
Semtech Corporation
Protection Products Division
200 Flynn Road, Camarillo, CA 93012
Phone: (805)498-2111 FAX (805)498-3804
Marking Codes Ordering Information
Tape and Reel Specification
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RailClamp and RClamp are marks of Semtech Corporation
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)400.±960.(
50.0±5.3
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)200.±831.(
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)4
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Pin 1 Location
User Direction of feed
Device Orientation in Tape
0502N
