SRV05-4 SEMTECH | Alldatasheet
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1 www.semtech.com PROTECTION PRODUCTS SRV05-4 Low Capacitance TVS Diode Array Description Features Circuit Diagram Schematic and PIN Configuration Revision 08/11/04 RailClamps are surge rated diode arrays designed to protect high speed data interfaces. The SR series has been specifically designed to protect sensitive compo- nents which are connected to data and transmission lines from overvoltage caused by electrostatic dis- charge (ESD), electrical fast transients (EFT), and lightning. The unique design of the SR series devices incorpo- rates eight 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 down- stream components. The SRV05-4 has a low typical capacitance of 3pF and operates with virtually no insertion loss to 1GHz. This makes the device ideal for protection of high-speed data lines such as USB 2.0, Firewire, DVI, and gigabit Ethernet interfaces. 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. They may be used to meet the ESD immunity requirements of IEC 61000-4-2, Level 4 (±15kV air, ±8kV contact dis- charge).
Applications
Mechanical Characteristics USB 2.0 Power and Data Line Protection Video Graphics Cards Monitors and Flat Panel Displays Digital Video Interface (DVI) 10/100/1000 Ethernet Notebook Computers SIM Ports ATM Interfaces IEEE 1394 Firewire Ports ESD protection for high-speed data lines to IEC 61000-4-2 (ESD) ±15kV (air), ±8kV (contact) IEC 61000-4-4 (EFT) 40A (5/50ns) IEC 61000-4-5 (Lightning) 12A (8/20µs) Array of surge rated diodes with internal TVS Diode Small package saves board space Protects four I/O lines Low capacitance: 3pF typical Low clamping voltage Low operating voltage: 5.0V Solid-state silicon-avalanche technology JEDEC SOT-23 6L package Molding compound flammability rating: UL 94V-0 Marking : V05 Packaging : Tape and Reel per EIA 481 SOT-23 6L (Top View) 13 4 6
2 2004 Semtech Corp. www.semtech.com PROTECTION PRODUCTS SRV05-4 Absolute Maximum Rating
Electrical Characteristics
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3 2004 Semtech Corp. www.semtech.com PROTECTION PRODUCTS SRV05-4 Typical Characteristics Non-Repetitive Peak Pulse Power vs. Pulse Time Power Derating Curve 100 110 0 25 50 75 100 125 150 Ambient Temperature - T A (oC) % of Rated Power or IPP Clamping Voltage vs. Peak Pulse CurrentPulse Waveform Forward Voltage vs. Forward Current Capacitance vs. Reverse Voltage 012345 Reverse Voltage - V R (V) Capacitance - Cj (pF) 0.00 5.00 10.00 15.00 20.00 25.00 30.00 Peak Pulse Current - I PP (A) Clamping Voltage -VC (V) Waveform Parameters: tr = 8µs td = 20µs 0.00 1.00 2.00 3.00 4.00 5.00 6.00 7.00 Forward Current - IF (A) Forward Voltage -VF (V) Waveform Parameters: tr = 8µs td = 20µs 0.01 0.1 0.1 1 10 100 1000 Pulse Duration - tp (µs) Peak Pulse Power - PPk (kW) 100 110 0 5 10 15 20 25 30 Time (µs) Percent of I PP e-t td = IPP/2 Waveform Parameters: tr = 8µs td = 20µs
4 2004 Semtech Corp. www.semtech.com PROTECTION PRODUCTS SRV05-4 3 dB/CH1 S21 LOG REF 0 dB START .030 000 MHz STOP 3 000 . 000 000 MHz CH1 S21 LOG 20 dB/ REF 0 dB START .030 000 MHz STOP 3 000 . 000 000 MHz Insertion Loss S21 Analog Cross Talk Applications Information
5 2004 Semtech Corp. www.semtech.com PROTECTION PRODUCTS SRV05-4 Device Connection Options for Protection of Four High-Speed Data Lines The SRV05-4 TVS 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 F) 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. 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: 1. To protect data lines and the power line, connect pin 5 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. 2. The SRV05-4 can be isolated from the power supply by adding a series resistor between pin 5 and V CC. A value of 100k Ω is recommended. The 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 the TVS (plus one diode drop). 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 Data Line and Power Supply Protection Using Vcc as reference Data Line Protection with Bias and Power Supply Isolation Resistor Data Line Protection Using Internal TVS Diode as Reference Applications Information
10 2004 Semtech Corp. www.semtech.com PROTECTION PRODUCTS SRV05-4 10/100 ETHERNET PROTECTION CONT’ Ethernet circuit to provide differential and common mode protection. The SRV05-4 can not be grounded on the line side because the hi-pot test requires the line side not to be grounded. GIGABIT ETHERNET PROTECTION The clock rate of gigabit Ethernet is the same 125MHz as the 10/100 Ethernet. However, it uses a complex five level signaling and transmits at a faster data rate that makes it more susceptible to capacitance and insertion loss. The low capacitance and low insertion loss of the SRV05-4 allow it to sit on the gigabit Ethernet line without loss of signal integrity. Figure 10 shows how to connect the SRV05-4 into a gigabit ethernet on the IC side for common and differential mode protection. Notice that pin 5 of the SRV05-4 is not connected. Some may be tempted to connect it to Vcc. In the ethernet application, the Vcc lines does Figure 10 - Gigabit Ethernet Protection for Bellcore 1089 Intra-Building Protection not come out through the connector and does not need to be protected. Figure 10 shows the LC03-3.3 on the line side for the secondary line protection to Bellcore 1089 intrabuilding. If the designer only needs to meet ESD, CDE and low level lightning, the LC03- 3.3 can be omitted.
11 2004 Semtech Corp. www.semtech.com PROTECTION PRODUCTS SRV05-4 Outline Drawing - SO-8 Land Pattern Outline Drawing .110 BSC .037 BSC DETAIL aaa C SEATING ccc C 2X N/2 TIPS 2X E/2 SEE DETAIL AA2 bxN A .008 N E .060 .114 .063 .118 .010 - A 0.20 1.60 3.00
2.80 BSC
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.069 1.50 2.90 .020 0.25 1.75 0.50- EI L (L1) c 0.25 PLANE GAGE H 2.80.110 bbb C A-B D .008 .004 .012 .003 (.024) .018 .035 .000 .035 .045 0.10 0.20 10° 0° - 10° 1.15 (0.60) 0.45.024 .009 0.30 0.08 .057 .051 .006 0.00 .90 0.90 0.22 0.60 0.15 1.45 1.30 1.90 BSC.075 BSC A e1 D e B C H NOM INCHES DIMENSIONS aaa bbb ccc N DIM c e L E D b A MIN MILLIMETERS MAX MIN NOM MAX PLANE D DATUMS AND TO BE DETERMINED AT DATUM PLANE CONTROLLING DIMENSIONS ARE IN MILLIMETERS (ANGLES IN DEGREES). DIMENSIONS "E1" AND "D" DO NOT INCLUDE MOLD FLASH, PROTRUSIONS3. OR GATE BURRS. NOTES: 2. -A- -B- -H- SIDE VIEW THIS LAND PATTERN IS FOR REFERENCE PURPOSES ONLY. CONSULT YOUR MANUFACTURING GROUP TO ENSURE YOUR COMPANY'S MANUFACTURING GUIDELINES ARE MET. NOTES: DIMENSIONS INCHES Y Z DIM G P X C MILLIMETERS .043 .141 .055 (.098) .037 .024 1.40 (2.50) 0.95 0.60 1.10 3.60 DIMENSIONS INCHES Y Z DIM G P X C MILLIMETERS P (C) Z Y G X
12 2004 Semtech Corp. www.semtech.com PROTECTION PRODUCTS SRV05-4 Contact Information Semtech Corporation Protection Products Division
200 Flynn Road, Camarillo, CA 93012
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