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PROTECTION PRODUCTS - RailClamp Description
RailClamps are surge rated diode arrays designed to protect high speed data interfaces. This series has been specifically designed to protect sensitive components which are connected to data and transmission lines from overvoltage caused by ESD (electrostatic discharge), CDE (Cable Discharge Events), and EFT (electrical fast transients). The unique design incorporates 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 components. The low capacitance array configuration allows the user to protect four high-speed data or transmission lines. The low inductance construction minimizes voltage overshoot during high current surges. 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).
RailClamp Low Capacitance TVS Array
Features
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) Array of surge rated diodes with internal TVS Diode Small package saves board space Protects up to four I/O lines & power line Low capacitance (<3pF) for high-speed interfaces No insertion loss to 2.0GHz Low leakage current and clamping voltage Low operating voltage: 5.0V Solid-state silicon-avalanche technology
RClamp0504S
Mechanical Characteristics
JEDEC SOT-23 6L package Nominal Dimensions: 2.9x2.8mm RoHS/WEEE Compliant Molding compound flammability rating: UL 94V-0 Marking: Marking Code Packaging: Tape and Reel
Applications
USB 2.0 USB OTG Monitors and Flat Panel Displays Digital Visual Interface (DVI) Gigabit Ethernet IEEE 1394 Firewire Ports
Circuit Diagram
Schematic & PIN Configuration
5
1
3
4
6
2
SOT-23 6L (Top View)
Revision 01/17/2008 1 www.semtech.com
RClamp0504S
PROTECTION PRODUCTS Absolute Maximum Rating
R ating Peak Pulse Power (tp = 8/20s) Peak Pulse Current (tp = 8/20s) ESD p er IEC 61000-4-2 (Air) ESD p er IEC 61000-4-2 (Contact) Op erating Temp erature Storage Temp erature Symbol Pp k IP P VESD TJ TSTG Value 150 6 15 8 -55 to +125 -55 to +150 Units Watts A kV C C
Electrical Characteristics (T=25oC)
Parameter Reverse Stand-Off Voltage Reverse Breakdown Voltage Reverse Leakage Current Clamp ing Voltage Clamp ing Voltage Junction Cap acitance
Symbol VRWM V BR IR VC VC Cj
Conditions Pi n 5 to 2 It = 1mA Pi n 5 to 2 VRWM = 5V, T=25C Pi n 5 to 2 IPP = 1A, tp = 8/20s A n y p i n to p i n 2 IPP = 6A, tp = 8/20s A n y p i n to p i n 2 VR = 0V, f = 1MHz Any I/O p in to p in 2 VR = 0V, f = 1MHz Between I/O p ins
Minimum
Typical
Maximum 5
Units V V
6 3 15 25 3 1.5
A V V pF pF
Note 1: I/O pins are pin 1, 3, 4, and 6
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RClamp0504S
PROTECTION PRODUCTS Typical Characteristics
Non-Repetitive Peak Pulse Power vs. Pulse Time
10
110 100 90 80 70 60 50 40 30 20 10 0
Power Derating Curve
Peak Pulse Power - P PP (kW)
1
0.1
0.01 0.1 1 10 Pulse Duration - tp (s) 100 1000
% of Rated Power or IPP
0
25
50
75
100
125
150
Ambient Temperature - TA (oC)
Pulse Waveform
110 100 90 80 70 60 50 40 30 20 10 0 0 5 10 15 Time (s) 20 25 30
0
PP
Clamping Voltage vs. Peak Pulse Current
Waveform Parameters: tr = 8s td = 20s
30 25 Clamping Voltage - VC (V) 20 15
Line to Ground
Line to Line
Percent of I
e-t
td = IPP/2
10 5
Waveform Parameters: tr = 8s td = 20s
0
1
2 3 4 5 Peak Pulse Current - IPP (A)
6
7
Forward Voltage vs. Peak Pulse Current
8 7 Forward Voltage - V F (V) 6
Normalized Junction Capacitance vs. Reverse Voltage
1.4 1.2 CJ(VR) / CJ(VR=0) 1 0.8 0.6 0.4 0.2
5 4 3 2 1 0 0 1 2 3 4 5 6 Peak Pulse Current - IPP (A) Waveform Parameters: tr = 8s td = 20s
f = 1 MHz
0 0 1 2 3 Reverse Voltage - VR (V) 4 5
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RClamp0504S
PROTECTION PRODUCTS
Insertion Loss S21 (I/O to Pin 2)
CH1 S21 LOG 6 dB / REF 0 dB 1: -0.1801 dB 900 MHz 2: -0.6816 dB 1.8 GHz 3: -3.0407 dB 2.448 GHz 0 dB
1 2 3 4
Insertion Loss S21 (I/O to I/O)
CH1 S21 LOG 6 dB / REF 0 dB 1: -0.1063 dB 900 MHz 2: -0.2660 dB 1.8 GHz 3: -0.5657 dB 2.5 GHz 0 dB
1 2 3
-6 dB -12 dB -18 dB -24 dB -30 dB -36 dB 1 MHz START . 030 MHz 10 MHz 100 MHz
4: -3.3538 dB 2.5 GHz
-6 dB -12 dB -18 dB -24 dB -30 dB
3 1 GHz GHz STOP 3000. 000000 MHz
-36 dB
1 MHz START . 030 MHz
10 MHz
100 MHz
3 1 GHz GHz STOP 3000. 000000 MHz
Analog Crosstalk
CH1 S21 LOG 20 dB / REF 0 dB
ESD Clamping (+8kV Contact per IEC 61000-4-2)
START . 030 MHz
. STOP 3000 000000 MHz
Note: Data is taken with a 10x attenuator
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RClamp0504S
PROTECTION PRODUCTS Applications Information
Device Connection Options for Protection of Four 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, 3, 4 and 6. Pin 2 should be connected directly to a ground plane. The path length is kept as short as possible to minimize parasitic inductance. The positive reference is connected at pin 5. The options for connecting the positive reference are as follows: 1. To protect data lines and the power line, connect pin 5 directly to the positive supply rail (VCC). In this configuration the data lines are referenced to the supply voltage. The internal TVS diode prevents over-voltage on the supply rail. 2. In applications where the supply rail does not exit the system, the internal TVS may be used as the reference. In this case, pin 5 is not connected. The steering diodes will begin to conduct when the voltage on the protected line exceeds the working voltage of the TVS (plus one diode drop). 3. In applications where complete supply isolation is desired, the internal TVS is again used as the reference and VCC is connected to one of the I/O inputs. An example of this configuration is the protection of a SIM port. The Clock, Reset, I/O, and VCC lines are connected at pins 1, 3, 4, and 6. Pin 2 is connected to ground and pin 5 is not connected. 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 compared 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.
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Protection of Four Data Lines and Power Supply Line
Protection of Four Data Lines Using Internal TVS Diode as Reference
RClamp0504S
PROTECTION PRODUCTS Applications Information - Spice Model
0.7 nH
RClamp0504S Spice Model
R Clamp0504S Spice Parameters Parameter IS BV VJ RS IB V CJO TT M N EG Unit Amp Volt Volt Ohm Amp Farad sec --eV D1 (LCR D) 1.29E-18 100 0.83 0.787 1E-3 1.0E-12 2.541E-19 0.215 1.1 1.11 D2 (LCR D) 1.53E-16 100 0.81 0.951 1E-3 0.8E-12 2.541E-19 0.100 1.1 1.11 D3 (T VS) 1.78E-10 7.75 0.59 0.771 1E-3 111E-12 2.541E-9 0.313 1.1 1.11
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RClamp0504S
PROTECTION PRODUCTS Outline Drawing - SOT-23 6L
A e1 N EI 1 ccc C 2X N/2 TIPS B 2 E D
DIM
A A1 A2 b c D E1 E e e1 L L1 N 01 aaa bbb ccc
DIMENSIONS INCHES MILLIMETERS MIN NOM MAX MIN NOM MAX
.057 .035 .000 .006 .035 .045 .051 .010 .020 .009 .003 .110 .114 .122 .060 .063 .069 .110 BSC .037 BSC .075 BSC .012 .018 .024 (.024) 6 0 10 .004 .008 .008 1.45 0.90 0.00 0.15 .90 1.15 1.30 0.25 0.50 0.08 0.22 2.80 2.90 3.10 1.50 1.60 1.75 2.80 BSC 0.95 BSC 1.90 BSC 0.30 0.45 0.60 (0.60) 6 0 10 0.10 0.20 0.20
2X E/2
e
D aaa C A2 SEATING PLANE C A1 bxN bbb C A-B D A
H GAGE PLANE 0.25 L (L1) SEE DETAIL c
01
A
DETAIL
A
SIDE VIEW
NOTES: 1. CONTROLLING DIMENSIONS ARE IN MILLIMETERS (ANGLES IN DEGREES). 2. DATUMS -A- AND -B- TO BE DETERMINED AT DATUM PLANE -H3. DIMENSIONS "E1" AND "D" DO NOT INCLUDE MOLD FLASH, PROTRUSIONS OR GATE BURRS.
Land Pattern - SOT-23 6L
X
DIM
(C) G Y P Z C G P X Y Z
DIMENSIONS MILLIMETERS INCHES
(.098) .055 .037 .024 .043 .141 (2.50) 1.40 0.95 0.60 1.10 3.60
NOTES: 1. THIS LAND PATTERN IS FOR REFERENCE PURPOSES ONLY. CONSULT YOUR MANUFACTURING GROUP TO ENSURE YOUR COMPANY'S MANUFACTURING GUIDELINES ARE MET.
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RClamp0504S
PROTECTION PRODUCTS Marking Ordering Information
Part Number RClamp 0504S.TCT Qty per Reel 3,000 Reel Size 7 Inch
S54
Tape and Reel Specification
Note: This is a lead-free RoHS/WEEE compliant device RailClamp and RClamp are marks of Semtech Corporation
User Direction of feed
A0 3.23 +/-0.05 mm
B0 3.17 +/-0.05 mm
K0 1.37 +/-0.05 mm
Tape Width
B, (Max)
D
D1
E
F
K (MAX)
P
P0
P2
T(MAX)
W 8.0 mm + 0.3 mm - 0.1 mm
8 mm
4.2 mm (.165)
1.5 + 0.1 mm - 0.0 mm
1.0 mm 0.05
1.750.10 mm
3.50.05 mm
2.4 mm
4.00.1 mm
4.00.1 mm
2.00.05 mm
0.4 mm
Contact Information
Semtech Corporation Protection Products Division 200 Flynn Rd., Camarillo, CA 93012 Phone: (805)498-2111 FAX (805)498-3804
2008 Semtech Corp. 8 www.semtech.com

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