RClamp0554S RailClamp®®®®® Low Capacitance TVS Diode Array ®®®®® PROTECTION PRODUCTS - RailClamp Description Features A RailClamp® is a low capacitance TVS array designed (cid:139) ESD protection for high-speed data lines to to protect high speed data interfaces. This series has IEC 61000-4-2 (ESD) ±15kV (air), ±8kV (contact) been specifically designed to protect sensitive compo- IEC 61000-4-4 (EFT) 40A (5/50ns) nents which are connected to data and transmission IEC 61000-4-5 (Lightning) 25A (8/20μs) lines from overvoltage caused by electrostatic dis- (cid:139) Array of surge rated diodes with internal TVS Diode charge (ESD), electrical fast transients (EFT), and (cid:139) Small package saves board space lightning. (cid:139) Protects four I/O lines and Voltage Bus The unique design incorporates eight surge rated, low (cid:139) Low capacitance: 5pF (VR=0V) capacitance steering diodes and a TVS diode in a (cid:139) Low clamping voltage single package. During transient conditions, the (cid:139) Low operating voltage: 5.0V steering diodes direct the transient to either the (cid:139) Solid-state silicon-avalanche technology positive side of the power supply line or to ground. The Mechanical Characteristics internal TVS diode prevents over-voltage on the power line, protecting any downstream components. (cid:139) JEDEC SOT-23 6L package The RClamp®0554S is in a 6-lead SOT-23 package. (cid:139) Pb-Free, Halogen Free, RoHS/WEEE Compliant The leads are finished with lead-free matte tin. Each (cid:139) Molding compound flammability rating: UL 94V-0 device will protect up to four high-speed lines. They (cid:139) Marking : Marking code + date code may be used to meet the ESD immunity requirements (cid:139) Packaging : Tape and Reel of IEC 61000-4-2, Level 4 (15kV air, 8kV contact Applications discharge). The combination of small size, low capaci- tance, and high surge capability makes them ideal for (cid:139) USB 2.0 Power and Data Line Protection use in applications such as Ethernet, USB 2.0, and (cid:139) 10/100/1000 Ethernet video interfaces. (cid:139) Video Graphics Cards (cid:139) Monitors and Flat Panel Displays (cid:139) Digital Video Interface (DVI) (cid:139) Notebook Computers (cid:139) IEEE 1394 Firewire Ports Circuit Diagram Schematic and PIN Configuration 5 1 3 4 6 2 SOT-23 6L (Top View) Revision 3/17/2011 1 www.semtech.com

RClamp0554S PROTECTION PRODUCTS Absolute Maximum Rating Rating Symbol Value Units PeakPulsePower(tp =8/20μs) P 375 Watts pk PeakPulseCurrent (tp =8/20μs) I 25 A PP ESDperIEC61000-4-2 (Air) VESD +/- 30 kV ESDperIEC61000-4-2 (Contact) +/- 25 Operating Temperature T -55to+125 °C J StorageTemperature T -55to+150 °C STG Electrical Characteristics (T=25oC) Parameter Symbol Conditions Minimum Typical Maximum Units ReverseStand-Off Voltage V 5 V RWM ReverseBreakdown Voltage V I =1mA 6 V BR t ReverseLeakageCurrent I V =5V, T=25°C 0.5 μA R RWM Clamping Voltage V I =1A, tp =8/20μs 9.8 V C PP Any I/OtoGND Clamping Voltage V I =10A, tp =8/20μs 12 V C PP Any I/OtoGND Clamping Voltage V I =25A, tp =8/20μs 15 V C PP Any I/OtoGND Junction Capacitance C Any I/OtoGND 5 pF j V =0V, f =1MHz R I/OtoI/O 3 pF V =0V, f =1MHz R © 2011 Semtech Corp. 2 www.semtech.com

RClamp0554S PROTECTION PRODUCTS Typical Characteristics Non-Repetitive Peak Pulse Power vs. Pulse Time Power Derating Curve 110 10 100 90 er - P (kW)PP Power or IPP 678000 ow 1 ed 50 e P Rat 40 k Puls % of 30 a 20 e P 10 0 0.1 0 25 50 75 100 125 150 0.1 1 10 100 Pulse Duration - tp ((cid:0)s) Ambient Temperature - TA (oC) Pulse Waveform Clamping Voltage vs. Peak Pulse Current 110 Waveform 100 14 Parameters: 90 tr = 8µs 80 td = 20µs (V)C 12 Percent of IPP 45670000 e-t td = IPP/2 ping Voltage -V 1068 30 am 4 Waveform 20 Cl Parameters: 2 tr = 8µs 10 td = 20µs 0 0 0 5 10 15 20 25 30 0 5 10 15 20 25 30 Time (µs) Peak Pulse Current - I (A) PP Forward Voltage vs. Forward Current Normalized Capacitance vs. Reverse Voltage 10 1.2 9 8 1 V) oltage - Vf ( 567 Cj(V=0V)R00..68 orward V 34 Waveform Cj(V) / R0.4 F 2 Parameters: tr = 8µs 0.2 1 td = 20µs f = 1 MHz 0 0 0 5 10 15 20 25 30 0 0.5 1 1.5 2 2.5 3 3.5 4 4.5 5 Peak Pulse Current - Ipp (A) Reverse Voltage (VR) - V © 2011 Semtech Corp. 3 www.semtech.com

RClamp0554S PROTECTION PRODUCTS Applications Information Insertion Loss S21 - Any I/O to GND Insertion Loss S21 - I/O to I/O CH1 S21 LOG 6 dB / REF 0 dB CH1 S21 LOG 6 dB / REF 0 dB 1: -1.0964 dB 1: -0.47220 dB 800 MHz 800 MHz 2: -1.2545 dB 2: -0.5278 dB 0 dB 900 MHz 0 dB 900 MHz -1-26 ddBB 1 2 3 3 4:: --161.8.67. G2424H95z 7d dBB -1-26 ddBB 1 2 3 4 5 3 4:: --129..8.62 G8312H18z dd BB 5 2.5 GHz 2.5 GHz -18 dB 4 -18 dB -24 dB -24 dB -30 dB -30 dB -36 dB -36 dB -42 dB -42 dB -48 dB -48 dB 1 10 100 1 3 1 10 100 1 3 MHz MHz MHz GHz GHz MHz MHz MHz GHz GHz START . 030 MHz STOP 3 000. 0000 00 MHz START . 030 MHz STOP 3 000. 0000 00 MHz ESD Clamping - Between any I/O and GND ESD Clamping - Between any I/O and GND (+8kV Contact per IEC 61000-4-2) (-8kV Contact per IEC 61000-4-2) Note: Data is taken with a 10x attenuator Note: Data is taken with a 10x attenuator © 2011 Semtech Corp. 4 www.semtech.com

RClamp0554S PROTECTION PRODUCTS Applications Information Data Line and Power Supply Protection Using Vcc as Device Connection Options for Protection of Four reference High-Speed Data Lines The RClamp0554S is designed to protect four 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 V) the F 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. The negative reference (REF1) 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. The positive reference (REF2) is connected at pin 5. The options for connecting the positive reference are as follows: Data Line Protection with Bias and Power Supply Isolation Resistor 1. To protect data lines and the power line, connect pin 5 directly to the positive supply rail (V ). In this CC configuration the data lines are referenced to the supply voltage. The internal TVS diode prevents over-voltage on the supply rail. 2. The RClamp0554S can be isolated from the power supply by adding a series resistor between pin 5 and V . A value of 100kΩ is recommended. The CC internal TVS and steering diodes remain biased, providing the advantage of lower capacitance. 3. In applications where no positive supply reference is available, or complete supply isolation is desired, 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 Data Line Protection Using Internal TVS Diode as the TVS (plus one diode drop). Reference ESD Protection With RailClamps®®®®® RailClamps are optimized for ESD protection using the rail-to-rail topology. Along with good board layout, these devices virtually eliminate the disadvantages of using discrete components to implement this topology. Consider the situation shown in Figure 1 where dis- crete diodes or diode arrays are configured for rail-to- rail protection on a high speed line. During positive duration ESD events, the top diode will be forward biased when the voltage on the protected line exceeds © 2011 Semtech Corp. 5 www.semtech.com

RClamp0554S PROTECTION PRODUCTS Applications Information (continued) the reference voltage plus the V drop of the diode. F For negative events, the bottom diode will be biased when the voltage exceeds the V of the diode. At first F approximation, the clamping voltage due to the charac- teristics of the protection diodes is given by: PIN Descriptions V = V + V (for positive duration pulses) C CC F V = -V (for negative duration pulses) C F However, for fast rise time transient events, the effects of parasitic inductance must also be consid- ered as shown in Figure 2. Therefore, the actual clamping voltage seen by the protected circuit will be: FFFFFiiiiiggggguuuuurrrrreeeee 11111 ----- “““““RRRRRaaaaaiiiiilllll-----TTTTTooooo-----RRRRRaaaaaiiiiilllll””””” PPPPPrrrrrooooottttteeeeeccccctttttiiiiiooooonnnnn TTTTTooooopppppooooolllllooooogggggyyyyy V = V + V + L di /dt (for positive duration pulses) (((((FFFFFiiiiirrrrrsssssttttt AAAAApppppppppprrrrroooooxxxxxiiiiimmmmmaaaaatttttiiiiiooooonnnnn))))) C CC F P ESD V = -V - L di /dt (for negative duration pulses) C F G ESD ESD current reaches a peak amplitude of 30A in 1ns for a level 4 ESD contact discharge per IEC 61000-4-2. Therefore, the voltage overshoot due to 1nH of series inductance is: V = L di /dt = 1X10-9 (30 / 1X10-9) = 30V P ESD Example: Consider a V = 5V, a typical V of 30V (at 30A) for the CC F steering diode and a series trace inductance of 10nH. The clamping voltage seen by the protected IC for a positive 8kV (30A) ESD pulse will be: FFFFFiiiiiggggguuuuurrrrreeeee 22222 ----- TTTTThhhhheeeee EEEEEffffffffffeeeeeccccctttttsssss ooooofffff PPPPPaaaaarrrrraaaaasssssiiiiitttttiiiiiccccc IIIIInnnnnddddduuuuuccccctttttaaaaannnnnccccceeeee WWWWWhhhhheeeeennnnn UUUUUsssssiiiiinnnnnggggg DDDDDiiiiissssscccccrrrrreeeeettttteeeee CCCCCooooommmmmpppppooooonnnnneeeeennnnntttttsssss tttttooooo IIIIImmmmmpppppllllleeeeemmmmmeeeeennnnnttttt V = 5V + 30V + (10nH X 30V/nH) = 335V C RRRRRaaaaaiiiiilllll-----TTTTTooooo-----RRRRRaaaaaiiiiilllll PPPPPrrrrrooooottttteeeeeccccctttttiiiiiooooonnnnn This does not take into account that the ESD current is directed into the supply rail, potentially damaging any components that are attached to that rail. Also note that it is not uncommon for the V of discrete diodes to F exceed the damage threshold of the protected IC. This is due to the relatively small junction area of typical discrete components. It is also possible that the power dissipation capability of the discrete diode will be exceeded, thus destroying the device. The RailClamp is designed to overcome the inherent disadvantages of using discrete signal diodes for ESD suppression. The RailClamp’s integrated TVS diode FFFFFiiiiiggggguuuuurrrrreeeee 33333 ----- RRRRRaaaaaiiiiilllll-----TTTTTooooo-----RRRRRaaaaaiiiiilllll PPPPPrrrrrooooottttteeeeeccccctttttiiiiiooooonnnnn UUUUUsssssiiiiinnnnnggggg RRRRRaaaaaiiiiilllllCCCCClllllaaaaammmmmppppp TTTTTVVVVVSSSSS AAAAArrrrrrrrrraaaaayyyyysssss © 2011 Semtech Corp. 6 www.semtech.com

RClamp0554S PROTECTION PRODUCTS Applications Information (continued) helps to mitigate the effects of parasitic inductance in the power supply connection. During an ESD event, the current will be directed through the integrated TVS diode to ground. The maximum voltage seen by the protected IC due to this path will be the clamping RClamp0554S voltage of the device. Universal Serial Bus ESD Protection The RClamp0554S may also be used to protect the USB ports on monitors, computers, peripherals or portable systems. Each device will protect up to two USB ports (Figure 4). When the voltage on the data lines exceed the bus voltage (plus one diode drop), the internal rectifiers are forward biased conducting the Figure 4 - Dual USB Port Protection transient current away from the protected controller chip. The TVS diode directs the surge to ground. The TVS diode also acts to suppress ESD strikes directly on the voltage bus. Thus, both power and data pins are protected with a single device. © 2011 Semtech Corp. 7 www.semtech.com

RClamp0554S PROTECTION PRODUCTS OOuuttlliinnee DDrraawwiinngg --S SOOT-283 6L DIMENSIONS INCHES MILLIMETERS A DIM MIN NOMMAX MIN NOMMAX e1 D A .035 - .057 0.90 - 1.45 A1 .000 - .006 0.00 - 0.15 A2 .035 .045 .051 .90 1.15 1.30 N b .010 - .020 0.25 - 0.50 2X E/2 c .003 - .009 0.08 - 0.22 EI E D .110 .114 .122 2.80 2.90 3.10 E1 .060 .063 .069 1.50 1.60 1.75 1 2 E .110 BSC 2.80 BSC ccc C e .037 BSC 0.95 BSC 2X N/2 TIPS e1 .075 BSC 1.90 BSC e L .012 .018 .024 0.30 0.45 0.60 L1 (.024) (0.60) B N 6 6 01 0° - 10° 0° - 10° aaa .004 0.10 bbb .008 0.20 D ccc .008 0.20 aaa C A2 A SEATING PLANE H C A1 bxN GAGE c bbb C A-B D PLANE 0.25 L 01 (L1) DETAIL A SEE 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-H- 3. DIMENSIONS "E1" AND "D" DO NOT INCLUDE MOLD FLASH, PROTRUSIONS OR GATE BURRS. Land Pattern -SOT23 6L X DDIIMMEENNSSIIOONNSS DDIIMM IINNCCHHEESS MMIILLLLIIMMEETTEERRSS CC (.098) (2.50) GG .055 1.40 (C) G Z PP .037 0.95 Y XX .024 0.60 YY .043 1.10 ZZ .141 3.60 P NOTES: 1. THIS LAND PATTERN IS FOR REFERENCE PURPOSES ONLY. CONSULT YOUR MANUFACTURING GROUP TO ENSURE YOUR COMPANY'S MANUFACTURING GUIDELINES ARE MET. © 2011 Semtech Corp. 8 www.semtech.com

RClamp0554S PROTECTION PRODUCTS Marking Codes Ordering Information Lead Qtyper Part Number ReelSize Finish Reel V54 W RClamp0554S.TCT MatteTin 3,000 7Inch Y YW = 2 - Alphanumeric characters for Date Code Tape and Reel Specification Pin 1 Location User Direction of feed A0 B0 K0 3.23+/-0.05mm 3.17+/-0.05mm 1.37+/-0.05mm Tape K B,(Max) D D1 E F P P0 P2 T(MAX) W Width (MAX) 8.0mm 1.0mm 1.750±.10 4.2mm 1.5+0.1mm 3.5±0.05 4.0±0.1 4.0±0.1 2.0±0.05 +0.3mm 8mm ±0.05 mm 2.4mm 0.4mm (.165) -0.0mm mm mm mm mm -0.1mm Contact Information Semtech Corporation Protection Products Division 200 Flynn Road, Camarillo, CA 93012 Phone: (805)498-2111 FAX (805)498-3804 © 2011 Semtech Corp. 9 www.semtech.com