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| PROTECTION PRODUCTS - RailClamp(R) Description The RailClamp(R) series consists of ultra low capacitance TVS arrays designed to protect high speed data interfaces. This series 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). They are designed for use in applications where board space is at a premium. Each device requires less than 2.9mm2 of PCB area and will protect two high speed data lines. The monolithic design incorporates surge rated, low capacitance steering diodes and a TVS diode in a single package. Each line has a typical capacitance of 0.9pF to ground and 0.3pF between lines. The capacitance of each line is well matched for consistant signal balance. Signal integrity is further preserved with the flow through design. A connection to the TVS is provided for protection of external voltage busses, such as those found in USB applications. 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). The RCLAMP0502A is in a 6-pin, RoHS/WEEE compliant, SC-89 (SOT-666) package. It measures 1.6 x 1.6 x 0.6mm. The leads are finished with lead-free matte tin. The small package makes it ideal for use in portable electronics such as cell phones, laptops, and digital still cameras. RailClamp(R) 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) Flow through design for ease of layout for high speed data line application Protects up to two I/O lines & power line Low capacitance (<0.9pF) for high-speed interfaces Ultra-small package requires less than 2.9mm2 of PCB area Low leakage current and clamping voltage Low operating voltage: 5.0V Solid-state silicon-avalanche technology RCLAMP0502A Mechanical Characteristics SC-89 (SOT-666) package RoHS/WEEE Compliant Lead Finish: matte tin Molding compound flammability rating: UL 94V-0 Marking: A Packaging: Tape and Reel Applications USB 2.0 High Speed 10/100/1000 Ethernet Ports High-Definition Multimedia Interface (HDMI) Digital Visual Interface (DVI) Monitors and Flat Panel Displays Video Graphics Cards IEEE 1394 Firewire Ports High Speed Circuit Diagram Schematic & PIN Configuration Pin 5 1 Pin 3 & 4 Pin 1 & 6 6 5 4 2 3 Pin 2 SC-89 6L (Top View) Revision 06/28/2008 1 www.semtech.com RCLAMP0502A 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) 1 ESD p er IEC 61000-4-2 (Contact) Op erating Temp erature Storage Temp erature Note 1: Between any I/O and GND Symbol Pp k IP P VESD TJ TSTG Value 50 3 20 15 -55 to +125 -55 to +150 Units Watts A kV C C Electrical Characteristics (T=25oC) Parameter Reverse Stand-Of f Voltage Reverse Breakdown Voltage Reverse Leakage Current Symbol VRWM VBR IR Conditions Between I/O lines to Gnd or I/O to I/O It = 1mA Between I/O lines to Gnd VRWM = 5V, T=25C Between I/O lines to Gnd or I/O to I/O IPP = 1A, tp = 8/20s Between I/O lines to Gnd IPP = 3A, tp = 8/20s Between I/O to Gnd IPP = 3A, tp = 8/20s Between I/O to I/O VR = 0V, f = 1MHz Between I/O to Gnd VR = 0V, f = 1MHz Between I/O to I/O 0.3 6 1 Minimum Typical Maximum 5 Units V V A Clamping Voltage Clamping Voltage Clamping Voltage VC VC VC 14 16 18 0.9 0.7 V V V pF pF Junction Capacitance Junction Capacitance Cj Cj (c) 2008 Semtech Corp. 2 www.semtech.com RCLAMP0502A PROTECTION PRODUCTS Typical Characteristics Non-Repetitive Peak Pulse Power vs. Pulse Time 10 Peak Pulse Power - PPP (kW) 110 100 % of Rated Power or IPP 90 80 70 60 50 40 30 20 10 Power Derating Curve 1 0.1 0.01 0.1 1 10 Pulse Duration - tp (s) 100 1000 0 0 25 50 75 100 125 150 Ambient Temperature - TA (oC) Clamping Voltage vs. Peak Pulse Current I/O to Gnd - Pin 1, 3, 4, 6 to Pin 2 16 14 Clamping Voltage - VC (V) Clamping Voltage - VC (V) 12 10 8 6 4 2 0 0 1 2 Peak Pulse Current - IPP (A) 3 4 15 20 Clamping Voltage vs. Peak Pulse Current I/O to I/O 10 Waveform Parameters: tr = 8s td = 20s 5 Waveform Parameters: tr = 8s td = 20s 0 1 2 Peak Pulse Current - Ipp (A) 3 4 0 Normalized Capacitance vs. Reverse Voltage I/O to Gnd - Pin 1, 3, 4, or 6 to Pin 2 1.4 NormalizedCapacitance - Cj 1.2 1 0.8 0.6 0.4 0.2 Normalized Capacitance vs. Reverse Voltage I/O to I/O 1.2 f = 1 MHz Normalized Capacitance - Cj 1 0.8 0.6 0.4 f = 1 MHz 0 0 1 2 3 Reverse Voltage - VR (V) 4 5 0.2 0 1 2 3 Reverse Voltage - VR (V) 4 5 (c) 2008 Semtech Corp. 3 www.semtech.com RCLAMP0502A PROTECTION PRODUCTS Typical Characteristics Insertion Loss S21 (I/O to I/O) CH1 S21 LOG 6 dB / REF 0 dB 1: .03430 dB 900 MHz 2: .07870 dB 1.8 GHz 3: .28040 dB 2.5 GHz 0 dB 1 2 1 2 Insertion Loss S21 (I/O to Gnd) CH1 S21 LOG 6 dB / REF 0 dB 1: .00460 dB 900 MHz 2: .02010 dB 1.8 GHz 3: -.08180 dB 2.5 GHz 3 3 0 dB -6 dB -12 dB -18 dB -24 dB -30 dB -36 dB 1 MHz START . 030 MHz 10 MHz 100 MHz 3 1 GHz GHz STOP 3000. 000000 MHz -6 dB -12 dB -18 dB -24 dB -30 dB -36 dB 1 MHz START . 030 MHz 10 MHz 100 MHz 3 1 GHz GHz STOP 3000. 000000 MHz ESD Response (4kV Contact per IEC 61000-4-2) ESD Response (8kV Contact per IEC 61000-4-2) Note: Data is taken with a 10x attenuator Note: Data is taken with a 10x attenuator (c) 2008 Semtech Corp. 4 www.semtech.com RCLAMP0502A PROTECTION PRODUCTS Applications Information Device Connection Options for Protection of Two 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 & 6 and pins 3 & 4. Pins 5 and 2 can be connected to ground or Vcc based on application and location of those connections. The connection to ground should be made directly to a ground plane. The path length should also be kept as short as possible to minimize parasitic inductance. Figure 1 shows the layout configuration to send data input at pins 6 and 4 and output at pins 1 and 3. This device is designed for ease of PCB layout by allowing the traces run straight through the device. Figure 2 shows the proper way to design the PCB board trace in order to use the flow through layout for two line pairs. The solid line represents the PCB trace. Note the PCB traces are used to connect the pin pairs for each I/O (pin 1 to pin 6 and pins 3 to pin 4). For example, I/O 1 enters at pin 6 and exits at pin 1 and the PCB trace connects pins 6 and 1 together. This is also true for I/O 2. The negative reference (Gnd) is connected at pin 2. The positive reference is connected at pin 5. Universal Serial Bus ESD Protection The RCLAMP0502A may also be used to protect both upstream and downstream USB ports on monitors, computers, peripherals or portable systems. Each device will protect up to one USB port (Figure 3). When the voltage on the data lines exceed the bus voltage (plus one diode drop), the internal rectifiers are forward biased conducting the 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. Figure 1. Protection of Two Data Lines and One Power Supply Line Figure 2. Flow Through Layout for Two Data Lines and one Power Line Figure 3. USB 2.0 (up to 480Mbps) Upstream or Downstream Port Protection D+ to protected Circuit Gnd Dto protected Circuit 1 2 3 6 5 4 D+ Vcc D- (c) 2008 Semtech Corp. 5 www.semtech.com RCLAMP0502A PROTECTION PRODUCTS Applications Information - Spice Model RCLAMP0502A Spice Model Table 1 - R Clamp0502A 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) 1E-20 110 0.67 0.339 1E-3 0.7E-12 2.541E-9 0.01 1.1 1.11 D2 (LCR D) 1E-20 20 0.67 0.568 1E-3 0.7E-12 2.541E-9 0.01 1.1 1.11 D3 (T VS) 2.43E-13 8 0.64 1.24 1E-3 83E-12 2.541E-9 0.222 1.1 1.11 (c) 2008 Semtech Corp. 6 www.semtech.com RCLAMP0502A PROTECTION PRODUCTS Outline Drawing - SC-89 (SOT-666) D A N E/2 E1 E D L 1 e Nxb B aaa C A-B D 2 c A DIM C L1 A b c D E E1 e L L1 N aaa DIMENSIONS INCHES MILLIMETERS MIN NOM MAX MIN NOM MAX .019 .024 .005 .012 .003 .007 .059 .063 .067 .061 .063 .067 .043 .047 .049 .020 BSC .003 .008 .012 .003 .006 .008 6 .004 0.50 0.60 0.15 0.30 0.10 0.18 1.50 1.60 1.70 1.55 1.60 1.70 1.10 1.20 1.25 0.50 BSC 0.10 0.20 0.30 0.10 0.15 0.20 6 0.10 NOTES: 1. CONTROLLING DIMENSIONS ARE IN MILLIMETERS (ANGLES IN DEGREES). 2. DIMENSIONS "E1" AND "D" DO NOT INCLUDE MOLD FLASH, PROTRUSIONS OR GATE BURRS. Land Pattern - SC-89 (SOT-666) X Y C DIM C P G X Y Z DIMENSIONS INCHES MILLIMETERS (.057) .020 .024 .012 .033 .090 (1.45) 0.50 0.60 0.30 0.85 2.30 Z G Y P NOTES: 1. THIS LAND PATTERN IS FOR REFERENCE PURPOSES ONLY CONSULT YOUR MANUFACTURING GROUP TO ENSURE YOUR COMPANY'S MANUFACTURING GUIDELINES ARE MET. (c) 2008 Semtech Corp. 7 www.semtech.com RCLAMP0502A PROTECTION PRODUCTS Marking Ordering Information Part Number Lead Finish Pb Free Qty per Reel 3,000 Reel Size 7 Inch A Tape and Reel Specification RClamp 0502A.TCT RailClamp and RClamp are registered marks of Semtech Corporation A A A Tape Specification and Device Orientation Contact Information Semtech Corporation Protection Products Division 200 Flynn Rd., Camarillo, CA 93012 Phone: (805)498-2111 FAX (805)498-3804 (c) 2008 Semtech Corp. 8 www.semtech.com |
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