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SR3.3 Dataheets PDF



Part Number SR3.3
Manufacturers Semtechoration
Logo Semtechoration
Description RailClamp Low Capacitance TVS Diode Array
Datasheet SR3.3 DatasheetSR3.3 Datasheet (PDF)

PROTECTION PRODUCTS Description RailClamps are surge rated diode arrays designed to protect high speed data interfaces. The SR series has been specifically designed to protect sensitive components which are connected to data and transmission lines from overvoltage caused by ESD (electrostatic discharge), EFT (electrical fast transients), and tertiary lightning. The unique design of the SR series devices incorporates four surge rated, low capacitance steering diodes and a TVS diode in a single pa.

  SR3.3   SR3.3


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PROTECTION PRODUCTS Description RailClamps are surge rated diode arrays designed to protect high speed data interfaces. The SR series has been specifically designed to protect sensitive components which are connected to data and transmission lines from overvoltage caused by ESD (electrostatic discharge), EFT (electrical fast transients), and tertiary lightning. The unique design of the SR series devices incorporates four surge rated, low capacitance steering diodes and a TVS diode in a single package. The TVS diode is constructed using Semtech’s proprietary low voltage EPD technology for superior electrical characteristics at 3.3 volts. 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 two high-speed data or transmission lines. The low inductance construction minimizes voltage overshoot during high current surges. RailClamp Low Capacitance TVS Diode Array PRELIMINARY Features ! ESD protection to IEC 61000-4-2, Level 4 ! Array of surge rated diodes with internal ! ! ! ! ! ! ! ! ! EPD TVS diode Protects two I/O lines Low capacitance (<10pF) for high-speed interfaces Low leakage current (< 1µA) Low operating voltage: 3.3V Solid-state technology SR3.3 Mechanical Characteristics JEDEC SOT-143 package Molding compound flammability rating: UL 94V-0 Marking : R3.3 Packaging : Tape and Reel per EIA 481 Applications ! ! ! ! ! ! Data and I/O lines Sensitive Analog Inputs Video Line Protection Portable Electronics Microcontroller Input Protection WAN/LAN Equipment Circuit Diagram Pin 4 Schematic & PIN Configuration 4 1 Pin 2 Pin 3 2 3 Pin 1 SOT-143 (Top View) Revision 9/2000 1 www.semtech.com SR3.3 PROTECTION PRODUCTS Absolute Maximum Rating R ating Peak Pulse Power (tp = 8/20µs) Peak Pulse Current (tp = 8/20µs) Peak Forward Voltage (IF = 1A, tp=8/20µs) Lead Soldering Temperature Operating Temperature Storage Temperature Symbol Pp k IP P VFP TL TJ TSTG Value 150 10 1.5 260 (10 sec.) -55 to +125 -55 to +150 PRELIMINARY Units Watts A V °C °C °C Electrical Characteristics SR 3.3 Par ame te r Reverse Stand-Off Voltage Punch-Through Voltage Snap -Back Voltage Reverse Leakage Current Clamp ing Voltage Clamp ing Voltage Maximum Peak Pulse Current Junction Cap acitance Symbo l VRWM V PT VSB IR VC VC IP P Cj IPT = 2µ A ISB = 50mA VRWM = 3.3V, T=25°C IPP = 1A, tp = 8/20µ s IPP = 10A, tp = 8/20µ s tp = 8/20µ s Between I/O p ins and Gnd VR = 0V, f = 1MHz Between I/O p ins VR = 0V, f = 1MHz 6 3.5 2.8 1 7 15 10 10 Co nditio ns Minimum Typical Maximum 3.3 Units V V V µA V V A pF 3 pF  2000 Semtech Corp. 2 www.semtech.com SR3.3 PROTECTION PRODUCTS Typical Characteristics Non-Repetitive Peak Pulse Power vs. Pulse Time 10 Peak Pulse Power - PPP (kW) 110 100 % of Rated Power or P IP 90 80 70 60 50 40 30 20 10 0.01 0.1 1 10 Pulse Duration - tp (µs) 100 1000 0 0 25 50 75 100 125 150 Ambient Temperature - TA (oC) PRELIMINARY Power Derating Curve 1 0.1 Pulse Waveform 110 100 90 80 Percent of IPP 70 60 50 40 30 20 10 0 0 5 10 15 Time ( µs) 20 25 30 td = IPP/2 e -t Clamping Voltage vs. Peak Pulse Current 16 Waveform Parameters: tr = 8µs td = 20µs Line-To-Line 14 Clamping Voltage (V) 12 10 8 6 4 2 0 0 2 4 6 8 Line-To-Ground 10 12 Peak Pulse Current (A) Forward Voltage vs. Forward Current 10 9 Forward Voltage - VF (V) 8 7 6 5 4 3 2 1 0 0 5 10 15 20 25 30 35 40 45 50 Forward Current - I F (A) Waveform Parameters: tr = 8µs td = 20µs  2000 Semtech Corp. 3 www.semtech.com SR3.3 PROTECTION PRODUCTS Applications Information Device Connection Options for Protection of Tw o High-Speed Data Lines The SR3.3 TVS is designed to protect two 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 2 and 3. The negative reference (REF1) is connected at pin 1. 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 4. The options for connecting the positive reference are as follows: 1. To protect data lines and the power line, connect pin 4 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. 2. The SR3.3 can be isolated from the power supply by adding a series resistor between pin 4 and VCC. A value of 10kΩ is recommended. The internal TVS and steering diodes remain biased, providing the advantage of lower capacitance. 3. In applications wh.


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