RClamp2502L RailClamp® 2.5V TVS for GbE Applications PROTECTION PRODUCTS - RailClamp® Description Features A RailClamp is a low capacitance TVS array 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 Lightning. 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 current away from the protected IC. The internal TVS diode clamps the transient voltage to a safe level. The low capacitance array configuration allows the user to protect up to two high-speed data lines. The RClamp®2502L is constructed using Semtech’s proprietary EPD process technology. The EPD process provides low stand-off voltages with significant reductions in leakage current and capacitance over siliconavalanche diode processes. They feature a true operating voltage of 2.5 volts for superior protection. The RClamp2502L is in a 8-pin SOIC package. The leads are finished with lead-free matte tin. The combination of low clamping voltage, high surge capability, and low loading capacitance makes the RClamp2502L an ideal solution for protecting GbE systems to the lightning immunity requirements of GR-1089. 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) IEC 61000-4-5 (Lightning) 24A (1.2/50μs) Array of surge rated diodes with internal TVS Diode Protects up to two I/O lines Low capacitance: <5pF (Line-to-Line) High surge capability: 40A ((tp=8/20μs) Low operating voltage: 2.5V Easy layout Solid-state silicon-avalanche technology Mechanical Characteristics JEDEC SO-8 package Pb-Free, Halogen Free, RoHS/WEEE Compliant Lead Finish: Matte tin Molding compound flammability rating: UL 94V-0 Marking : Marking Code, date code Packaging : Tape and Reel Applications Functional Circuit Diagram 10/100/1000 Ethernet Interfaces CPE Equipment GPON Systems VoIP Phones Video Surveillance Systems Package Configuration 1.27 Pin 1 Pin 8 4.00 6.00 1 2 Pin 2, 3, 6, 7 5.00 Pin 4 1.75 Pin 5 SO-8 (Max Dimensions in mm) Revision 10/22/2009 1 www.semtech.com RClamp2502L PROTECTION PRODUCTS Absolute Maximum Rating R ating Symbol Value Units Peak Pulse Power (tp = 8/20μs) Pp k 800 Watts Peak Pulse Current (tp = 8/20μs) IP P 40 A ESD p er IEC 61000-4-2 (Air) ESD p er IEC 61000-4-2 (Contact) VESD 25 15 kV TJ -40 to +85 °C TSTG -55 to +150 °C Op erating Temp erature Storage Temp erature Electrical Characteristics (T=25oC) R Clamp2502L Parameter Reverse Stand-Off Voltage Symbol Conditions Minimum VRWM Typical Maximum Units 2.5 V Punch-Through Voltage V PT IPT = 2μA 2.7 V Snap -Back Voltage VSB ISB = 50mA 2.8 V Reverse Leakage Current IR VRWM = 2.5V, T=25°C 1 μA Clamp ing Voltage VC IPP = 12A, tp = 8/20μs Between p ins 1, 8 and 4,5 9.5 V Clamp ing Voltage VC IPP = 24A, tp = 8/20μs Between p ins 1, 8 and 4,5 12.5 V Clamp ing Voltage VC IPP = 40A, tp = 8/20μs Between p ins 1, 8 and 4,5 20 V Junction Cap acitance Cj Between p ins 1,8 or 4,5 and 2,3 VR = 0V, f = 1MHz 10 pF Between p ins 1, 8 and 4,5 VR = 0V, f = 1MHz 5 pF © 2009 Semtech Corp. 2 www.semtech.com RClamp2502L PROTECTION PRODUCTS Typical Characteristics Non-Repetitive Peak Pulse Power vs. Pulse Time Power Derating Curve 10 110 % of Rated Power or PI P Peak Pulse Power - PPP (kW) 100 1 90 80 70 60 50 40 30 20 10 0 0.1 0.1 1 10 100 0 1000 25 Pulse Duration - tp (us) Pulse Waveform 100 125 150 2 Waveform Parameters: tr = 8µs td = 20µs 100 90 70 1.8 1.6 Cj(VR) / Cj(VR=0V) 80 PP 75 Normalized Junction Capacitance vs. Reverse Voltage (I/O to I/O) 110 Percent of I 50 Ambient Temperature - TA (oC) e-t 60 50 40 td = IPP/2 30 1.4 1.2 1 0.8 0.6 20 0.4 10 0.2 0 0 5 10 15 20 25 f = 1 MHz 0 30 0 Time (µs) 0.5 1 1.5 2 2.5 Reverse Voltage - VR (V) Clamping Voltage vs. Peak Pulse Current I/O to I/O ESD Clamping (8kV Contact per IEC 61000-4-2) Clamping Voltage - VC (V) 20 15 10 Waveform Parameters: tr = 8μs td = 20μs 5 0 0 5 10 15 20 25 30 35 40 Peak Pulse Current - IPP (A) Note: Data is taken with a 10x attenuator © 2009 Semtech Corp. 3 www.semtech.com RClamp2502L PROTECTION PRODUCTS Typical Characteristics Insertion Loss S21 (I/O to I/O) CH1 S21 LOG Insertion Loss S21 (I/O to Ground) 6 dB / REF 0 dB CH1 S21 LOG 6 dB / REF 0 dB 1: -.1438 dB 174.506 MHz 0 dB 5 1: -.16500 dB 122.418 MHz 2: -1.2515 dB 800 MHz 0 dB 2: -2.6848 dB 800 MHz 3 1 1 2 3: -3.1365 dB 1.30415 GHz 3 -6 dB 4 -12 dB 4 -18 dB 5: -2.1395 dB 2.7 GHz -24 dB -30 dB -36 dB -36 dB START . 030 MHz © 2009 Semtech Corp. 10 MHz 100 MHz 1 MHz 3 1 GHz GHz STOP 3000. 000000 MHz START . 030 MHz 4 3: -3.1819 dB 920.165M Hz 4: -13.925 dB 1.8 GHz 5: -5.4107 dB 2.7 GHz -24 dB -30 dB 1 MHz 5 -12 dB 4: -9.3869 dB 1.8 GHz -18 dB 2 -6 dB 10 MHz 100 MHz 3 1 GHz GHz STOP 3000. 000000 MHz www.semtech.com RClamp2502L PROTECTION PRODUCTS Applications Information Circuit Diagram Device Connection Options for Protection of Two High-Speed Data Lines Pin 1 The RClamp2502L is designed to protect two highspeed data lines (one differential pair) from transient over-voltages which result from lightning and ESD. Data line inputs/outputs are connected at pins 1 to 8, and 4 to 5. The device is designed such that PCB traces can remain unbroken and routed thru the device as shown. Differential protection is achieved by leaving pins 2, 3, 6, and 7 not connected. Pin 2, 3, 6, 7 Pin 4 Protecting Ethernet-based Systems to the ShortHaul/Intrabuilding Lightning Immunity Requirements of GR-1089 The Telcordia Technologies (Bellcore) GR-1089-CORE specification defines a set of requirements for lightning and AC power cross immunity for intrabuilding equipment. The lightning tests are applied as ±800 volt metallic (line-to-line) or ±1500 volt longitudinal (line-toground) surges. The waveforms are defined with a rise time of 2µs and a decay time of 10µs with a short circuit current of 100A. One surge of positive and one of negative polarity are applied. To pass the test, the equipment must continue to operate after the test. The combination of low clamping voltage, high surge capability, and low loading capacitance makes the RClamp2502L an ideal solution for protecting GbE systems to the lightning immunity requirements of GR1089. In a typical system the RClamp2502L is located on the PHY side of the transformer (see schematic on next page). One device is required for each transmit and receive line pair. This configuration relies on the transformer isolation voltage to suppress the 1500 volt common mode surge. While this negates the need for longitudinal line side protection, it is important to make sure the resistor/capacitor termination networks are rated accordingly. During metalic mode surges, energy will be transferred through the magnetics until the transformer saturates. The RClamp2502L will clamp the transferred voltage to a safe level, protecting the Ethernet PHY. The amount of energy will vary depending on the transformer, but will be well within the surge handling capability of the RClamp2502L. As always, the final design should be verified with testing. © 2009 Semtech Corp. Pin 8 Pin 5 Connection for Differential Protection (Line-to-Line) Line in 1 8 Line out Line in 4 5 Line out 5 www.semtech.com RClamp2502L PROTECTION PRODUCTS Applications Information TPA+ 1 R1 TPA- C1 C5 C2 C6 RClamp2502L TPB+ 1 TPB- RClamp2502L D2 TPC+ 1 R3 TPC- RJ-45 R2 Transformer Gigabit Ethernet PHY D1 C3 C7 C4 C8 RClamp2502L D3 TPD+ 1 R4 TPD- RClamp2502L D4 TPA+ 1 TPA- RClamp2502L D1 TPB+ 1 RJ-45 R1 Transformer 10/100 Ethernet PHY Schematic Diagram for Gigabit Ethernet Telcordia GR-1089 Intra-Building Protection (PHY Operating Temp </= 90°C with 100m of CAT 5) R2 TPB- RClamp2502L D2 Schematic Diagram for 10/100 Ethernet Telcordia GR-1089 Intra-Building Protection © 2009 Semtech Corp. 6 www.semtech.com RClamp2502L PROTECTION PRODUCTS Applications Information - Spice Model D2 D3 I/O D1 RClamp2502L Spice Model R Clamp2502L Spice Parameters © 2009 Semtech Corp. Parameter Unit D1 D2 D3 IS Amp 1E-14 1E-14 1.66E-13 BV Volt 100 100 2.89 VJ Volt 0.6 0.6 0.53 RS Ohm 0.09 0.15 0.06 IB V Amp 1E-3 1E-3 1E-3 CJO Farad 2E-12 2E-12 288E-12 TT sec 2.541E-9 2.541E-9 2.541E-9 M -- 0.01 0.01 0.17 N -- 1.1 1.1 1.1 EG eV 1.11 1.11 1.11 7 www.semtech.com RClamp2502L PROTECTION PRODUCTS Outline Drawing - SOIC-8 A D e N DIM E1 E 1 .053 .069 .004 .010 .049 .065 .020 .012 .007 .010 .189 .193 .197 .150 .154 .157 .236 BSC .050 BSC .010 .020 .016 .028 .041 (.041) 8 0° 8° .004 .010 .008 A A1 A2 b c D E1 E e h L L1 N 01 aaa bbb ccc 2X E/2 2 ccc C 2X N/2 TIPS DIMENSIONS INCHES MILLIMETERS MIN NOM MAX MIN NOM MAX e/2 B D aaa C h A2 A SEATING PLANE C A1 bxN bbb 1.75 1.35 0.25 0.10 1.65 1.25 0.31 0.51 0.17 0.25 4.80 4.90 5.00 3.80 3.90 4.00 6.00 BSC 1.27 BSC 0.25 0.50 0.40 0.72 1.04 (1.04) 8 0° 8° 0.10 0.25 0.20 h H C A-B D c GAGE PLANE 0.25 SEE DETAIL L (L1) A DETAIL SIDE VIEW 01 A NOTES: 1. CONTROLLING DIMENSIONS ARE IN MILLIMETERS (ANGLES IN DEGREES). 2. DATUMS -A- AND -B- TO BE DETERMINED AT DATUM PLANE -H3. DIMENSIONS "E1" AND "D" DO NOT INCLUDE MOLD FLASH, PROTRUSIONS OR GATE BURRS. 4. REFERENCE JEDEC STD MS-012, VARIATION AA. Land Pattern - SOIC-8 X DIM (C) G C G P X Y Z Z Y DIMENSIONS INCHES MILLIMETERS (.205) .118 .050 .024 .087 .291 (5.20) 3.00 1.27 0.60 2.20 7.40 P NOTES: 1. THIS LAND PATTERN IS FOR REFERENCE PURPOSES ONLY. CONSULT YOUR MANUFACTURING GROUP TO ENSURE YOUR COMPANY'S MANUFACTURING GUIDELINES ARE MET. 2. REFERENCE IPC-SM-782A, RLP NO. 300A. © 2009 Semtech Corp. 8 www.semtech.com RClamp2502L PROTECTION PRODUCTS Marking Ordering Information SC YYWW RC2502L CHINA Part Number Working Voltage Qty per Reel R eel Size RClamp 2502L.TBT 2.5 Volts 500 7 Inch RailClamp and RClamp are marks of Semtech Corporation YYWW = Date Code Tape and Reel Specification User Direction of feed Device Orientation in Tape A0 6.50 +/-0.20 mm B0 K0 5.40 +/-0.20 mm Tape Width B, (Max) D 12 mm 8.2 mm (.476) 1.5 + 0.1 mm - 0.0 mm 2.00 +/-0.10 mm D1 E 1.5 mm 1.750±.10 mm F K (MAX) P P0 P2 T(MAX) W 5.5±0.05 mm 4.5 mm 4.0±0.1 mm 4.0±0.1 mm 2.0±0.05 mm 0.4 mm 12 mm ± 0.3 mm Contact Information Semtech Corporation Protection Products Division 200 Flynn Rd., Camarillo, CA 93012 Phone: (805)498-2111 FAX (805)498-3804 © 2009 Semtech Corp. 9 www.semtech.com