- 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 000-4-, Level 4 (±kv air, ±8kV contact discharge). Circuit Diagram RailClamp Low Capacitance TVS Array Features Transient protection for high-speed data lines to IEC 000-4- (ESD) ±kv (air), ±8kV (contact) IEC 000-4-4 (EFT) 40A (/0ns) Array of surge rated diodes with internal TVS Diode Small package (.4 x.mm) saves board space Protects up to four I/O lines & power line Low capacitance (<3pF) for high-speed interfaces No insertion loss to.0ghz Low leakage current and clamping voltage Low operating voltage:.0v Solid-state silicon-avalanche technology Mechanical Characteristics EIAJ SC-70 L package Lead Finish: Matte Tin RoHS/WEEE Compliant Molding compound flammability rating: UL 94V-0 Marking : F4 Packaging : Tape and Reel per EIA 48 Applications USB.0 USB OTG Monitors and Flat Panel Displays Digital Visual Interface (DVI) High-Definition Multimedia Interface (HDMI) Gigabit Ethernet SIM Ports IEEE 394 Firewire Ports Schematic & PIN Configuration 3 4 3 4 SC-70 L (Top View) Revision /8/008
Absolute Maximum Rating Rating Symbol Value Units Peak Peak Pulse Power (tp = 8/0μs) Pulse Current (tp = 8/0μs) P pk 0 Watts I PP A ESD per IEC 000-4- (Air) ESD per IEC 000-4- (Contact) V ESD 8 kv Operating Temperature T J - to + C Storage Temperature T STG to +0 - C Electrical Characteristics (T= o C) Parameter Symbol Conditions Minimum Typical Maximum Units Reverse Stand-Off Voltage V WM R in to P V Reverse Breakdown Voltage B I t = ma Pin to V R V Reverse Leakage Current I R V RWM = V, T= C Pin to Clamping Voltage V C I PP = A, tp = 8/0μs Any pin to pin Clamping Voltage V C I PP = A, tp = 8/0μs Any pin to pin Junction Capacitance C j V R = 0V, f = MHz Any I/O pin to pin V R = 0V, f = MHz Between I/O pins 3 μa V V 3 pf. pf Note : I/O pins are pin, 3, 4, and 008 Semtech Corp.
Typical Characteristics Non-Repetitive Peak Pulse Power vs. Pulse Time Power Derating Curve Peak Pulse Power - P PP (kw) 0 0. 0.0 0. 0 00 000 Pulse Duration - tp (μs) % of Rated Power or IPP 0 00 90 80 70 0 0 40 30 0 0 0 0 0 7 00 0 Ambient Temperature - T A ( o C) Pulse Waveform Clamping Voltage vs. Peak Pulse Current Percent of I PP 0 00 90 80 70 0 0 40 30 0 0 0 e -t td = I PP / Waveform Parameters: tr = 8µs td = 0µs 0 0 0 30 Time (µs) Clamping Voltage - V C (V) 0 0 Waveform Parameters: tr = 8µs td = 0µs Pin, 3, 4, or to pin Pin to pin 0 3 4 Peak Pulse Current - I PP (A) Forward Voltage vs. peak Pulse Current Capacitance vs. Reverse Voltage (Normalized to 0V) 8 7 f = MHz Forward Voltage - V F (V) 4 3 Waveform Parameters: tr = 8µs td = 0µs Normalized Capacitance. 0. Any I/O Pin to Pin 0 0 3 4 Peak Pulse Current - I PP (A) 0 0 3 4 Reverse Voltage - V R (V) 008 Semtech Corp. 3
Typical Characteristics Insertion Loss S (I/O to Pin ) CH S LOG db / REF 0 db Insertion Loss S (I/O to I/O) CH S LOG db / REF 0 db START. 030 MHz STOP 3000. 000 000 MHz START. 030 MHz STOP 3000. 000 000 MHz Analog Crosstalk ESD Response (8kV Contact per IEC 000-4-) CH S LOG 0 db/ REF 0 db START. 030 MHz STOP 3000. 000 000 MHz Note: Data is taken with a 0x attenuator 008 Semtech Corp. 4
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, 3, 4 and. Pin 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. The options for connecting the positive reference are as follows:. To protect data lines and the power line, connect pin directly to the positive supply rail (V CC ). In this configuration the data lines are referenced to the supply voltage. The internal TVS diode prevents over-voltage on the supply rail.. In applications where the supply rail does not exit the system, the internal TVS may be used as the reference. In this case, pin 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 V CC 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, 3, 4, and. Pin is connected to ground and pin is not connected. Protection of Four Data Lines and Power Supply Line Protection of Four Data Lines Using Internal TVS Diode as Reference 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 00% 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. 008 Semtech Corp.
Typical Applications SIM Port - Protection of Three Data Lines and VCC USB OTG Receptable Carkit To Phone Mini B Receptable VBus D - D + ID GND Shield Gnd 3 4 Mini A Receptable USB OTG Carkit Protection 008 Semtech Corp.
Typical Applications SD IEEE 394 Firewire Protection Gigabit Ethernet Protection 008 Semtech Corp. 7
Outline Drawing - SC70-L E/ ccc C X N/ TIPS A N B D e e E D E DIMENSIONS INCHES MILLIMETERS DIM MIN NOM MAX MIN NOM MAX A - -.043 - -.0 A A.000.08 -.03.004.039 0.00 0.70-0.90 0.0.00 b.00 -.0 0. - 0.30 c D.003.07 -.079.009.087 0.08.80 -.00 0..0 E.04.049.03...3 E.083 BSC.0 BSC e.0 BSC 0. BSC e.0.30 BSC L.00.04.08 0. 0.3 0.4 L N (.07) (0.4) 0 0-8 0-8 aaa.004 0.0 bbb ccc.004.0 0.0 0.30 aaa C A A SEATING PLANE C A bxn bbb C A-B D GAGE PLANE H c SIDE VIEW SEE DETAIL A 0. DETAIL A L (L) 0 NOTES:. CONTROLLING DIMENSIONS ARE IN MILLIMETERS (ANGLES IN DEGREES).. DATUMS -A- AND -B- TO BE DETERMINED AT DATUM PLANE -H- 3. DIMENSIONS "E" AND "D" DO NOT INCLUDE MOLD FLASH, PROTRUSIONS OR GATE BURRS. 4. REFERENCE JEDEC STD MO-03, VARIATION AB. Land Pattern - SC70-L C X Y G Z DIM C G P X Y Z DIMENSIONS INCHES MILLIMETERS (.073) (.8).039.00.0 0..0 0.40.033 0.8.0.70 P NOTES:. THIS LAND PATTERN IS FOR REFERENCE PURPOSES ONLY. CONSULT YOUR MANUFACTURING GROUP TO ENSURE YOUR COMPANY'S MANUFACTURING GUIDELINES ARE MET. 008 Semtech Corp. 8
Marking Ordering Information Part Number Qty per Reel Reel Size F4.TCT 3,000 7 Inch RailClamp and RClamp are trademarks of Semtech Corporation Tape and Reel Specification F4 F4 F4 F4 F4 F4 F4 F4 Device Orientation in Tape Tape Width B, (Max) D D (MIN) E F K (MAX) P P0 P T(MAX) W 8 mm 4. mm (.). + 0. mm - 0.0 mm (0.9 +.00 -.000).0 mm (.039).70±.0 mm (.09±.004) 3.±0.0 mm (.38±.00).4 mm (.094) 4.0±0. mm (.7±.00-4) 4.0±0. mm (.7±.00-4).0±0.0mm (.079±.00) 0.4 mm (.0) 8.3 mm (.3±.0) Contact Information Semtech Corporation Protection Products Division 00 Flynn Rd., Camarillo, CA 930 Phone: (80)498- FAX (80)498-3804 008 Semtech Corp. 9