Document
PPRROOTTEECCTTIIOONN PPRROODDUUCCTTSS - RailClamp® Description
RailClamp is an ultra low capacitance Transient Voltage Suppressor (TVS) designed to protect high speed data interfaces. This device 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).
The RClampTM0531T has a maximum capacitance of only 0.80pF. This allows it to be used on circuits operating in excess of 2.5GHz without signal attenuation. They may be used to meet the ESD immunity
requirements of IEC 61000-4-2.
The RClamp0531T is in a 2-pin SLP1006P2T package measuring 1.0 x 0.6 x 0.4mm. The leads are spaced at a pitch of 0.65mm and feature a lead-free finish. Each device will protect one high-speed line operating at 5 volts. It gives the designer the flexibility to protect single lines in applications where arrays are not practical. The combination of small size, low capacitance, and high ESD surge capability makes them ideal for use in applications such as cellular phones and digital video interfaces.
RClamp0531T
Ultra-Low Capacitance 1-Line ESD protection
Features
Transient protection for data lines to IEC 61000-4-2 (ESD) ±20kV (air), ±12kV (contact) IEC 61000-4-4 (EFT) 40A (tp = 5/50ns) Cable Discharge Event (CDE)
Ultra-small package (1.0 x 0.6 x 0.4mm) Protects one I/O line Low capacitance: 0.8pF Low clamping voltage Low operating voltage: 5.0V Solid-state silicon-avalanche technology
Mechanical Characteristics
SLP1006P2T package Molding compound flammability rating: UL 94V-0 Marking: Marking code + date code Packaging : Tape and Reel Lead Finish: NiPdAu Pb-Free, Halogen Free, RoHS/WEEE Compliant
Applications
Cellular Handsets & Accessories Digital Visual Interface (DVI) FM Antenna MDDI Ports USB Ports PCI Express Serial ATA
Dimensions
Schematic & PIN Configuration
1.0
0.60 0.65
0.40
Maximum Dimensions (mm)
SLP1006P2T (Bottom View)
Revision 03/07/2011
1
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PROTECTION PRODUCTS Absolute Maximum Rating
Rating Peak Pulse Power (tp = 8/20μs) Peak Pulse Current (tp = 8/20μs) ESD per IEC 61000-4-2 (Air) ESD per IEC 61000-4-2 (Contact) Operating Temperature Storage Temperature
Electrical Characteristics (T=25oC)
RClamp0531T
Symbol Ppk IPP VESD
TJ TSTG
Value 80 4
+/- 20 +/- 12 -55 to +125 -55 to +150
Units Watts
A kV
°C °C
Parameter Reverse Stand-Off Voltage Reverse Breakdown Voltage
Reverse Leakage Current
Clamping Voltage
Clamping Voltage
Symbol VRWM VBR
IR
VC
VC
Junction Capacitance
Cj
Conditions
It = 1mA VRWM = 5V, T=25°C IPP = 1A, tp = 8/20μs IPP = 4A, tp = 8/20μs VR = 0V, f = 1MHz
Minimum 6
Typical 9.3
Maximum 5 11
Units V V
0.010
0.100
μA
12 V
20 V
0.50 0.80 pF
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RClamp0531T
PROTECTION PRODUCTS Typical Characteristics
Non-Repetitive Peak Pulse Power vs. Pulse Time
10
Peak Pulse Power - PPP (kW)
1
0.1
0.01 0.1
1 10 Pulse Duration - tp (us)
100
% of Rated Power or IPP
110 100
90 80 70 60 50 40 30 20 10
0 0
Power Derating Curve
25 50 75 100 125 Ambient Temperature - TA (oC)
150
Clamping Voltage -VC (V)
Clamping Voltage vs. Peak Pulse Current
16 14 12 10
8 6 4 2 0
0
123 Peak Pulse Current - IPP (A)
Waveform Parameters:
tr = 8µs td = 20µs
45
Cj(VR) / Cj(VR=0V)
Normalized Capacitance vs. Reverse Voltage
1.100 1.050 1.000 0.950 0.900 0.850 0.800
0
f = 1 MHz
1234 Reverse Voltage (VR)
5
Insertion Loss S21
CH1 S21 LOG 6 dB / REF 0 dB
0 dB
-6 dB
-12 dB -18 dB
-24 dB
-30 dB
-36 dB
-42 dB
-48 dB
1 MHz
START. 030 MHz
10 MHz
1: -0.15390 dB 800 MHz
5 2: -0.1480 dB
12 3 4
900 MHz
3: 0.01210 dB 1.8 GHz
4: 0.09410 dB 2.5 GHz
100 MHz
13 GHz GHz
STOP 3000.000000 MHz
© 2011 Semtech Corp.
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USB 2.0 Eye Pattern with RClamp0531T
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PROTECTION PRODUCTS
ESD Clamping (+8kV Contact per IEC 61000-4-2)
RClamp0531T
ESD Clamping (-8kV Contact per IEC 61000-4-2)
Note: Data is taken with a 10x attenuator
Note: Data is taken with a 10x attenuator
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PROTECTION PRODUCTS
Applications Information
Device Connection Options
These low capacitance TVS diodes are designed to provide common mode protection for one high-speed line or differential protection for one line pair. The device is bidirectional and may be used on lines where the signal polarity is positive and negative.
Circuit Board Layout Recommendations for Suppression of ESD.
Good circuit board layout is critical for the suppression of ESD induced transients. The following guidelines are recommended: z Place the TVS near the input terminals or connec-
tors to restrict transient coupling. z Minimize the path length between the TVS and the
protected line. z Minimize all conductive loops including power and
ground loops. z The ESD transient return path to ground should be
kept as short as possible. z Never ru.