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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 three 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 USB OTG and SIM interfaces. They may be used to meet the ESD immunity requirements of IEC 61000-4-2, Level 4 (15kV air, 8kV contact discharge).
RailClamp TVS Array for USB OTG Interfaces
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 three I/O lines & power line Low capacitance (<3pF) for high-speed interfaces Low clamping voltage Low operating voltage: 5.0V Solid-state silicon-avalanche technology
RCLAMP0503F
Mechanical Characteristics
EIAJ SC-70 5L package Molding compound flammability rating: UL 94V-0 Lead Finish: Matte Tin RoHS/WEEE Compliant Marking : F53 Packaging : Tape and Reel per EIA 481
Applications
USB OTG interfaces SIM Ports Video Graphics Cards Personal Digital Assistants (PDAs) Monitors and Flat Panel Displays Portable Electronics Microcontroller Input Protection
Circuit Diagram
Schematic & PIN Configuration
5
1
3
4
2
SC-70 5L (Top View)
Revision 04/05/2005 1 www.semtech.com
RCLAMP0503F
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=25C)
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 6 3 15 25 3 1.5 Minimum Typical Maximum 5 Units V V A V V pF pF
Note 1: I/O pins are pin 1, 3, and 4
2005 Semtech Corp.
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RCLAMP0503F
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
5
PP
Clamping Voltage vs. Peak Pulse Current
Waveform Parameters: tr = 8s td = 20s
25 Waveform Parameters: tr = 8s td = 20s
Clamping Voltage - VC (V)
20
Any I/O to pin 2
Percent of I
e-t
15
Pin 5 to pin 2
td = IPP/2
10
0
1
2 3 4 Peak Pulse Current - IPP (A)
5
6
Forward Voltage vs. Forward Current
5
Capacitance vs. Reverse Votlage (Normalized to 0V)
2 f = 1MHz
Clamping Voltage (V)
Pin 2 to I/O I/O to Pin 5
Normalized Capacitance
4
1.5
Any I/O Pin to Pin 2
3
1
2 Waveform Parameters: tr = 8s td = 20s
1
0.5
0 0 1 2 3 4 5 6 Peak Pulse Current (A)
0 0 1 2 3 4 5 Reverse Voltage - VR (V)
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RCLAMP0503F
PROTECTION PRODUCTS
Insertion Loss S21 (I/O to Pin 2)
CH1 S21 LOG 6 dB / REF 0 dB CH1 S21
Insertion Loss S21 (I/O to I/O)
LOG 6 dB / REF 0 dB
START . 030 MHz
. STOP 3000 000000 MHz
START . 030 MHz
. STOP 3000 000000 MHz
Analog Crosstalk
CH1 S21 LOG 20 dB/ REF 0 dB
START . 030 MHz
. STOP 3000 000000 MHz
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RCLAMP0503F
PROTECTION PRODUCTS Applications Information
Device Connection Options for Protection of Three High-Speed Data Lines This device is designed to protect three data lines from transient over-voltages by clamping them to a fixed reference. When the voltage on the protected line exceeds the reference voltage (plus diode VF) the steering diodes are forward biased, conducting the transient current away from the sensitive circuitry. Data lines are connected at pins 1, 3, and 4. The negative reference is connected at pin 2. This pin should be connected directly to a ground plane on the board for best results. The path length is kept as short as possible to minimize parasitic inductance. 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. Protecting USB On-The-Go (OTG) Interfaces The USB OTG interface consists of the Data (D+ and D) lines, 5.25V voltage bus, and an ID pin. Since these pins are part of the connector, they are vulnerable to ESD and cable discharge events. The RCLAMP0503F is designed to protect all four USB OTG connections. The lines can be easily routed through the device as shown in the layout example. 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. USB On-The-Go Port Protection Data Line and Power Supply Protection Using Vcc as reference
USB On-The-Go Port Layout Example
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RCLAMP0503F
PROTECTION PRODUCTS Outline Drawing - SC70-5L
DIMENSIONS INCHES MILLIMETERS MIN NOM MAX MIN NOM MAX
.043 .000 .004 .028 .035 .039 .006 .012 .003 .009 .075 .079 .083 .045 .049 .053 .083 BSC .026 BSC .051 .010 .014 .018 (.017) 5 0 8 .004 .004 .012 1.10 0.00 0.10 0.70 0.90 1.00 0.15 0.30 0.08 0.22 1.90 2.00 2.10 1.15 1.25 1.35 2.10 BSC 0.65 BSC 1.30 BSC 0.26 0.36 0.46 (0.42) 5 0 8 0.10 0.10 0.30
A e1 N 2X E/2 EI E GAGE PLANE 0.15 L (L1) e B D aaa C SEATING PLANE A2 A SIDE VIEW C A1 bxN bbb C A-B D DETAIL c D H
DIM
A A1 A2 b c D E1 E e e1 L L1 N 01 aaa bbb ccc
01
ccc C 2X N/2 TIPS
1
2
A
SEE DETAIL
A
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. 4. REFERENCE JEDEC STD MO-203, VARIATION AA.
Land Pattern - SC70-5L
X
DIM
C Y P G Z C G P X Y Z
DIMENSIONS MILLIMETERS INCHES
(.073) .039 .026 .016 .033 .106 (1.85) 1.00 0.65 0.40 0.85 2.70
NOTES: 1. THIS LAND PATTERN IS FOR REFERENCE PURPOSES ONLY. CONSULT YOUR MANUFACTURING GROUP TO ENSURE YOUR COMPANY'S MANUFACTURING GUIDELINES ARE MET.
2005 Semtech Corp.
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RCLAMP0503F
PROTECTION PRODUCTS Marking Codes Ordering Information
Part Number Lead Finish Matte Tin Qty per Reel 3,000 Reel Size 7 Inch
F53
1
RCLAMP0503F.TCT
RailClamp and RClamp are registered marks of Semtech Corporation
Tape and Reel Specification
F53
F53
F53
F53
F53
F53
F53
F53
Device Orientation in Tape
Tape Width
B, (Max)
D 1.5 + 0.1 mm - 0.0 mm (0.59 +.005 - .000)
D1 ( M IN )
E 1.750.10 mm (.069.004)
F
K (MAX)
P 4.00.1 mm (.157.004)
P0 4.00.1 mm (.157.004)
P2
T(MAX)
W
8 mm
4.2 mm (.165)
1.0 mm (.039)
3.50.05 mm (.138.002)
2.4 mm (.094)
2.00.05mm (.079.002)
0.4 mm (.016)
8.3 mm (.312.012)
Contact Information
Semtech Corporation Protection Products Division 200 Flynn Rd., Camarillo, CA 93012 Phone: (805)498-2111 FAX (805)498-3804
2005 Semtech Corp. 7 www.semtech.com

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