1www.semtech.com
RClamp0502B
Ultra-Low Capacitance TVS
for ESD and CDE Protection
PROTECTION PRODUCTS - RailClamp
Description Features
Dimensions Schematic & PIN Configuration
Revision 04/05/2005
RailClamps are ultra low capacitance TVS arrays
designed to protect high speed data interfaces. This
series has been specifically designed to protect sensi-
tive 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 RClampTM0502B has a typical capacitance of only
0.50pF (pin 1 to 2). This means it can be used on
circuits operating in excess of 3GHz without signal
attenuation. They may be used to meet the ESD
immunity requirements of IEC 61000-4-2, Level 4
(±15kV air, ±8kV contact discharge). Each device can
be configured to protect 1 bidirectional line or two
unidirectional lines.
These devices are in a small SC-75 (SOT-523) package
and feature a lead-free, matte tin finish. They are com-
patible with both lead free and SnPb assembly tech-
niques. They are designed for use in applications where
board space is at a premium. The combination of small
size, low capacitance, and high level of ESD protection
makes them a flexible solution for applications such as
HDMI, MDDI, antenna circuits, Automatic Test Equipment,
USB 2.0, and Infiniband circuits.
Applications
Mechanical Characteristics
High-Definition Multimedia Interface (HDMI)
Mobile Display Digital Interface (MDDI)
RF/Antenna Circuits
USB 2.0 & Firewire Ports
GaAs Photodetector Protection
HBT Power Amp Protection
Infiniband Transceiver Protection
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)
Designed to replace polymer TVS
Protects up to two I/O lines
Ultra-Low capacitance (<1pF)
No insertion loss to >3.0GHz>3.0GHz
>3.0GHz>3.0GHz
>3.0GHz
Low profile (<1mm)
Low leakage current and clamping voltage
Low operating voltage: 5.0V
Solid-state silicon-avalanche technology
SC-75 (SOT-523) package
Lead Finish: Matte Tin
RoHS/WEEE Compliant
Molding compound flammability rating: UL 94V-0
Marking: P5
Packaging: Tape and Reel per EIA 481
SC-75 3L (Top View)
12
3
1.60
1.60
1.00
BSC
0.50 BSC
0.75
0.80
Nominal Dimensions (mm)
2 2005 Semtech Corp. www.semtech.com
PROTECTION PRODUCTS
RClamp0502B
Absolute Maximum Rating
Electrical Characteristics (T=25oC)
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3
2005 Semtech Corp. www.semtech.com
PROTECTION PRODUCTS
RClamp0502B
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 Temperature - TA (oC)
% of Rated Power or IPP
Clamping Voltage vs. Peak Pulse Current
Pin 1 or Pin 2 to Pin 3
Normalized Capacitance vs. Reverse Voltage
Pin 1 or Pin 2 to Pin 3
0
5
10
15
20
25
0123456
Peak Pulse Current - I
PP
(A)
Clamping Voltage - V
C
(V)
Waveform
Parameters:
tr = 8µs
td = 20µs
Normalized Capacitance vs. Reverse Voltage
Pin 1 to Pin 2
0
2
4
6
8
10
12
14
16
18
20
0123456
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 Pulse Power - PPP (kW)
Clamping Voltage vs. Peak Pulse Current
Pin 1 to Pin 2
0.2
0.4
0.6
0.8
1
1.2
012345
Reverse Voltage - VR (V)
Normalized Capacitance - Cj
f = 1 MHz
0
0.2
0.4
0.6
0.8
1
1.2
1.4
012345
Reverse Voltage - VR (V)
NormalizedCapacitance - Cj
f = 1 MHz
4 2005 Semtech Corp. www.semtech.com
PROTECTION PRODUCTS
RClamp0502B
Insertion Loss S21 (Pin 1 to Pin 2)
ESD Response (4kV Contact per IEC 61000-4-2)
Typical Characteristics
ESD Response (8kV Contact per IEC 61000-4-2)
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
Insertion Loss S21 (Pin 1 or Pin 2 to Pin 3)
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
Analog Crosstalk
START
.
030 MHz 3
STOP 000
.
000 000 MHz
CH1 S21 LOG 20 dB / REF 0 dB
5
2005 Semtech Corp. www.semtech.com
PROTECTION PRODUCTS
RClamp0502B
Device Connection Options
This device is optimized for protection of 1 line
operating in excess of 3GHz. It may also be used to
protect two lines operating in excess of 2.0GHz. The
device is connected as follows:
Protection for one line with <1pF capacitance can be
achieved by connecting one data line to either pin 1 or
pin 2 with the other pin connected to ground. Pin 3 is
not connected. 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.
Protection of two lines is achieved by connecting data
lines at pins 1 & 2. Pin 3 is connected to ground. 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.
Matte Tin Lead Finish
Matte tin has become the industry standard lead-free
replacement for SnPb lead finishes. A matte tin finish
is composed of 100% tin solder with large grains.
Since the solder volume on the leads is small com-
pared to the solder paste volume that is placed on the
land pattern of the PCB, the reflow profile will be
determined by the requirements of the solder paste.
Therefore, these devices are compatible with both
lead-free and SnPb assembly techniques. In addition,
unlike other lead-free compositions, matte tin does not
have any added alloys that can cause degradation of
the solder joint.
Figure 1. Pin Configuration
Applications Information
6 2005 Semtech Corp. www.semtech.com
PROTECTION PRODUCTS
RClamp0502B
Applications Information
HDMI DisplayHDMI Transmitter HDMI DisplayHDMI Transmitter
The HDMI Compliance Test Specification (CTS) requires
sink (receiver) ports maintain a differential impedance
of 100 Ohms +/- 15%. The measurement is taken
using a Time Domain Reflectometry (TDR) method that
utilizes a pulse with a risetime <= 200ps.
ESD protection devices have an inherent junction
capacitance. Even a small amount of added
capacitance on an HDMI port will cause the
impedance of the differential pair to drop. As such,
some form of compensation to the layout will be
required to bring the differential pairs back within the
required 100 Ohm +/- 15% range. The higher the
added capacitance, the more extreme the
modifications will need to be. If the added
capacitance is too high, compensation may not even
be possible. The RClamp0502B presents <1pF
capacitance between the pairs while being rated to
handle >8kV ESD contact discharges (>15kV air
discharge) as outlined in IEC 61000-4-2. As such, it is
possible to make minor adjustments to the board
layout parameters to compensate for the added
capacitance of the RClamp0502B. Figure 2 shows
how to implement the RClamp0502B in an HDMI
application (transmitter and receiver). Figure 3 shows
impedance test results using a Semtech evaluation
board with layout compensation. As shown, the device
meets the HDMI CTS impedance requirements.
Figure 2 - HDMI Schematic
Figure 3 - TDR Measurement using Semtech
Evaluation Board
A B
X-axis 1.640 1.855 (nsec)
Y-axis 99.2 104.6
(Ohm)
AB
AB
7
2005 Semtech Corp. www.semtech.com
PROTECTION PRODUCTS
RClamp0502B
Applications Information - Spice Model
RClamp0502B Spice Model
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8 2005 Semtech Corp. www.semtech.com
PROTECTION PRODUCTS
RClamp0502B
Outline Drawing -SC-75 (SOT-523)
Land Pattern -SC-75 (SOT-523)
-A- -B-
2. -H-
bbb .008 0.20
aaa .004 0.10
12
3
PLANE
SEATING
SEATING PLANE
DETAIL A
H
C
aaa C
C
0c
SEE DETAIL A
D
E1 E
bxN
e
A1
A2
INCHES
.063
E
D
b
e
c
.005
.003
.057
A1
DIM
A
MIN
.000
.023
0.30
0.20
1.75
0.15
0.10
1.45
-
.039 BSC
-
.063
.012
.008
.069
1.00 BSC
-
-
1.60
1.60
MILLIMETERS
MAX
0.10
0.90
MIN
DIMENSIONS
0.00
MAXNOM
-
-.004
.035
NOM
0.60 -
-
CONTROLLING DIMENSIONS ARE IN MILLIMETERS (ANGLES IN DEGREES).
NOTES:
OR GATE BURRS.
DIMENSIONS "E1" AND "D" DO NOT INCLUDE MOLD FLASH, PROTRUSIONS
3.
1.
1.701.50.059 .067
e1 .020 BSC 0.50 BSC
L(.009) (0.22)
A2 .023 .030 0.750.60.031 0.80
E1 .031 0.80
SIDE VIEW
A
bbb C A B
B
0.850.75
N3 3
0-8°0°8°0° -
.033.029
DATUMS AND TO BE DETERMINED AT DATUM PLANE
L
A
e1
Y
P 1.00.039
X
Y
P
p1
p1 .020 0.50
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
C
MILLIMETERSINCHES
(1.40)
.031
.087
.016
.024
(.055)
0.80
2.20
0.40
0.60
DIMENSIONS
ZCG
9
2005 Semtech Corp. www.semtech.com
PROTECTION PRODUCTS
RClamp0502B
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
P 5
Device Orientation in Tape
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)561.(
mm1.0+5.1
mm0.0-
500.+95.0(
)000.-
mm0.1
)930.(
01.±057.1
mm
)400.±960.(
50.0±5.3
mm
)200.±831.(
mm4.2
)490.(
1.0±0.4
mm
-00.±751.(
)4
1.0±0.4
mm
-00.±751.(
)4
-m50.0±0.2
m
)200.±970.(
mm4.0
)610.(
mm3.8
)210.±213.(
