RClamp3374N High Power TVS for Ethernet Interfaces PROTECTION PRODUCTS - RailClamp® Description PRELIMINARY Features RailClamp TVS diodes are 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). The unique design incorporates surge rated, low capacitance steering diodes and a TVS diode in a single package. The RClamp®3374N is designed to replace up to two components for board level GbE protection. Each device is designed to protect two line pairs. This is accomplished by routing traces through the device. When connected in this fashion, the device can withstand a high level of surge current (40A, 8/ 20us) while maintaining a low loading capacitance of less than 5pF. The high surge capability means it can be used in high threat environments in applications such as Gigabit Ethernet, telecommunication lines, and LVDS interfaces. The RClamp3374N 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. It features a true operating voltage of 3.3 volts for superior protection. The RClamp3374N is in a 10-pin SLP3020N10 package. It measures 3.0 x 2.0 x 0.60mm. The leads are finished with lead-free NiPdAu. ® Transient protection for high-speed data lines to IEC 61000-4-2 (ESD) ±30kV (air), ±30kV (contact) IEC 61000-4-4 (EFT) 40A (5/50ns) IEC 61000-4-5 (Lightning) 40A (8/20μs) Array of surge rated diodes with internal TVS Diode Qualified to AEC-Q100 Grade 1 (-45 to +125oC) Protects up to eight lines Low capacitance for high-speed interfaces Low variation in capacitance vs. bias voltage Low clamping voltage Low operating voltage: 3.3V Solid-state silicon-avalanche technology Mechanical Characteristics SLP3020N10 10L package Pb-Free, Halogen Free, RoHS/WEEE Compliant Nominal Dimensions: 3.0 x 2.0 x 0.60 mm Lead Finish: NiPdAu Molding compound flammability rating: UL 94V-0 Marking : Marking code + Date code Packaging : Tape and Reel Applications Circuit Diagram 10/100/1000 Ethernet Automotive Central Office Equipment LVDS Interfaces MagJacks / Integrated Magnetics Notebooks / Desktops / Servers Pin Configuration Pin 1 LINE 1 In Pin 4 LINE 3 In Line 1 In 1 10 Line 1 Out GND Line 2 In Pin 10 LINE 1 Out Pin 7 LINE 3 Out Pin 2 LINE 2 In Pin 5 LINE 4 In Line 2 Out GND GND GND Line 3 In Line 3 Out GND Line 4 In Center Tabs and Pins 3, 8 Revision 7/24/2012 6 5 Line 4 Out Pin 6 LINE 4 Out Pin 9 LINE 2 Out Top View 1 www.semtech.com RClamp3374N PRELIMINARY PROTECTION PRODUCTS Absolute Maximum Rating R ating Symbol Value Units Peak Pulse Power (tp = 8/20μs)1 Pp k 1000 Watts Peak Pulse Current (tp = 8/20μs)1 IP P 40 A VESD +/-30 +/-30 kV TJ -40 to +125 °C TSTG -55 to +150 °C ESD p er IEC 61000-4-2 (Air) ESD p er IEC 61000-4-2 (Contact) Op erating Temp erature Storage Temp erature Electrical Characteristics (T=25oC unless otherwise specified) Parameter Reverse Stand-Off Voltage Symbol Conditions Minimum Typical VRWM Maximum Units 3.3 V Punch-Through Voltage V PT IPT = 2μA 3.5 V Snap -Back Voltage VSB ISB = 50mA 2.8 V Reverse Leakage Current IR VRWM = 3.3V, T=25°C 0.5 μA Reverse Leakage Current IR VRWM = 3.3V, T=125°C 1 μA Clamp ing Voltage2 VC IPP = 1A, tp = 8/20μs Any I/O to Ground 5.5 V Clamp ing Voltage2 VC IPP = 10A, tp = 8/20μs Any 1 I/O to Ground 10.5 V Clamp ing Voltage2 VC IPP = 25A, tp = 8/20μs Any I/O to Ground 18 V Clamp ing Voltage1,2 VC IPP = 40A, tp = 8/20μs Line-to-Line, two I/O p ins connected together on each line (N ote 1) 25 V Junction Cap acitance2 Cj VR = 0V, f = 1MHz Any I/O to Ground 3.6 5 pF VR = 0V, f = 1MHz Between I/O p ins 1.7 pF Notes: 1) Ratings with 2 pins connected together per the recommended configuration (ie pin 1 connected to pin 10, pin 2 connected to pin 9, pin 4 connected to pin 7, and pin 5 connected to pin 6). 2) Guaranteed by design (not production tested) © 2012 Semtech Corporation 2 www.semtech.com RClamp3374N PRELIMINARY PROTECTION PRODUCTS Typical Characteristics Non-Repetitive Peak Pulse Power vs. Pulse Time Power Derating Curve Peak Pulse Power - P PP (kW) 10 120 % of Rated Power or IPP 100 1 80 60 40 20 0.1 0.1 1 10 100 0 1000 0 Pulse Duration - tp (us) 25 50 75 100 125 150 O Ambient Temperature - TA ( C) Clamping Voltage vs. Peak Pulse Current Forward Clamping Voltage vs. Peak Pulse Current 15 25 I/O to GND I/O to I/O 2 I/O to GND 2 I/O to 2 I/O Clamping Voltage - Vc(V) Clamping Voltage - Vc(V) 20 GND to 1 I/O GND to 2 I/O 15 10 10 5 Waveform Parameters: tr = 8µs td = 20µs 5 0 0 0 10 20 30 40 0 50 10 20 Capacitance vs. Reverse Voltage 40 50 Typical TLP Characteristic 30 5.0 TLP Parameters: tp = 100ns tr = 200ps I/O to GND I/O to I/O 25 4.0 20 3.0 Current (A) Capacitance - Cj(pf) 30 Peak Pulse Current - Ipp (A) Peak Pulse Current - Ipp (A) 2.0 15 Rdyn=0.23 Ohms 10 1.0 5 f = 1 MHz 0.0 0 1 2 3 0 4 0 Reverse Voltage - VR(V) © 2012 Semtech Corporation 2 4 6 8 10 12 Voltage (V) 3 www.semtech.com RClamp3374N PRELIMINARY PROTECTION PRODUCTS Typical Characteristics (Con’t) Insertion Loss S21 (I/O to I/O) Insertion Loss S21 (I/O to Gnd) CH1 S21 LOG 6 dB / REF 0 dB CH1 S21 LOG 6 dB / REF 0 dB 1: - 0.5954 dB 800 MHz 0 dB 1: - 0.3708 dB 800 MHz 2: - 0.6386 dB 900 MHz 0 dB 3: - 1.9606 dB 1.8 GHz -6 dB 2: - 0.3976 dB 900 MHz 3 5 4 -12 dB 3 -18 dB -30 dB -36 dB -36 dB -42 dB -42 dB 10 MHz 100 MHz -48 dB 3 1 GHz GHz STOP 3000. 000000 MHz START . 030 MHz LOG 1 MHz 10 MHz 100 MHz 3 1 GHz GHz STOP 3000. 000000 MHz START . 030 MHz Insertion Loss S21 (2 I/O to Gnd) CH1 S21 5: - 4.3385 dB 2.7 GHz -24 dB -30 dB 1 MHz 4: - 3.4436 dB 2.5 GHz -18 dB 5: - 5.2975 dB 2.7 GHz -24 dB 3: - 1.3979 dB 1.8 GHz 4 -12 dB 4: - 4.3959 dB 2.5 GHz -48 dB 5 12 12 -6 dB Insertion Loss S21 (2 I/O to 2 I/O) 6 dB / REF 0 dB CH1 S21 LOG 6 dB / REF 0 dB 1: - 2.3263 dB 800 MHz 1: - 1.1102 dB 800 MHz 2: - 2.5056 dB 900 MHz 0 dB 12 -6 dB 3 5 12 3: - 5.7891 dB 1.8 GHz -6 dB 3 5 3: - 3.4256 dB 1.8 GHz 4 -12 dB 4 -18 dB -12 dB 4: - 9.2386 dB 2.5 GHz 4: - 6.8820 dB 2.5 GHz -18 dB 5: - 10.111 dB 2.7 GHz -24 dB -30 dB -36 dB -36 dB -42 dB -42 dB 1 MHz START . 030 MHz © 2012 Semtech Corporation 10 MHz 100 MHz 5: - 7.9734 dB 2.7 GHz -24 dB -30 dB -48 dB 2: - 1.1958 dB 900 MHz 0 dB -48 dB 3 1 GHz GHz STOP 3000. 000000 MHz 1 MHz START . 030 MHz 4 10 MHz 100 MHz 3 1 GHz GHz STOP 3000. 000000 MHz www.semtech.com RClamp3374N PRELIMINARY PROTECTION PRODUCTS Typical Characteristics (Con’t) Analog Crosstalk (I/O to GND) CH1 S21 LOG Analog Crosstalk (I/O to I/O) 20dB / REF 0 dB CH1 S21 0 dB 0 dB -20 dB -20 dB -40 dB -40 dB -60 dB -60 dB -80 dB -80 dB -100 dB -100 dB -120 dB -120 dB -140 dB -140 dB -160 dB LOG 20dB / REF 0 dB -160 dB STOP 3000. 000000 MHz START . 030 MHz START . 030 MHz STOP 3000. 000000 MHz ESD Clamping - I/O to Gnd (8kV Contact per IEC 61000-4-2) 60 Clamping Voltage (V) 50 40 30 20 10 0 -20 0 20 40 60 80 Time (ns) © 2012 Semtech Corporation 5 www.semtech.com RClamp3374N PRELIMINARY PROTECTION PRODUCTS Applications Information Pin Configuration Device Connection Options for Protection of Four High-Speed Data Lines This device is designed to protect four high-speed data lines (two line pairs). It has been optimized for use on Ethernet interfaces where large magnitude lightning and ESD surges are expected. The RClamp3374N is constructed using Semtech’s proprietary EPD process technology. The EPD process provides low stand-off (turn-on) voltages with significant reductions while maintaining good clamping characteristics and high surge capability. They feature a true operating voltage of 3.3 volts. Each I/O pin pair features a low capacitance steering diode bridge that is designed to route harmful surge current into the internal low voltage TVS diode. Each data pair is rated to withstand 1000 Watts of surge power (8/20us impulse waveform). When placed on the PHY side of the magnetics, it can be used to meet the requirements of Telcordia GR-1089, K.20, K.21, and other high energy surge standards. The RClamp3374N is designed with a flow through pin configuration for easy layout. In a GbE application, TX+ and TX- lines would enter at pins 1, 2, 4, and 5 and exit at pins 10, 9, 7, and 6 respectively. The traces should be unbroken and run under the device as shown. Pins 3 and 8 are electrically connected to the three center ground tabs. In a typical Ethernet application, these pins as well as the tabs should be left floating (i.e. not connected to ground). © 2012 Semtech Corporation Tx1+ In 1 10 Tx1+ Out GND Tx1- In Tx1- Out GND GND GND Tx2+ In Tx2+ Out GND Tx2- In 5 6 Tx2- Out Layout Example 6 www.semtech.com RClamp3374N PRELIMINARY PROTECTION PRODUCTS Applications Information duration of the surge is attenuated by the inductance of the magnetics. The amount of attenuation will vary by vendor and configuration of the magnetics. It is this transferred energy that must be clamped by the protection circuitry. Gigabit Ethernet Protection Solutions Ethernet systems with connections external to the building are subject to high-level transient threats. This type of equipment may even be required to meet the surge immunity requirements of Telcordia GR1089. Reliable protection of the Ethernet transceiver requires a device that can absorb the expected transient energy, clamp the incoming surge to a safe level, and yet remain transparent to the system under normal operation. The RClamp3374N has been designed to meet these demanding requirements. A typical protection scheme which utilizes the RClamp3374N is shown in Figure 1. One device is placed across two line pairs and is located on the PHY side of the transformer as close to the magnetics as possible. This is done to minimize parasitic inductance and improve clamping performance. In this design, the isolation voltage of the transformer is relied upon to suppress common mode lightning surges. High voltage capacitors and resistors are commonly utilized from the center tap to ground to aid in transient protection. Metallic surges will be transferred in some form to the PHY side and clamped by the RClamp3374N. The RClamp3374N will turn on when the voltage across it exceeds the punch-through voltage of the device. Low voltage turn on is important since many PHY chips have integrated ESD protection structures. These structures are for protection of the device during manufacture and are not designed to handle large amounts of energy. Should they turn on before the external protection, they can be damaged resulting in failure of the PHY chip. Transient Protection When designing Ethernet protection, the entire system must be considered. An Ethernet port includes interface magnetics in the form of transformers and common mode chokes. Transformers and chokes can be discrete components, but integrated solutions that include the RJ-45 connector, resistors, capacitors, and protection are also available. In either case, the transformer will provide a high level of common mode isolation to external voltages, but no protection for metallic (line-to-line) surges. During a metallic transient event, current will flow into one line, through the transformer and back to the source. As the current flows, it charges the windings of the transformer on the line side. Once the surge is removed, the windings on the line side will stop charging and will transfer its stored energy to the IC side where the PHY IC is located. The magnitude and RClamp3374N TP1+ RJ-45 Connector TP1TP2+ 1 2 TP2- 3 4 TP3+ 5 GbE Ethernet PHY 6 7 TP3- 8 TP4+ TP4- RClamp3374N Figure 1 - GbE Protection to Lightning, ESD, and CDE © 2012 Semtech Corporation 7 www.semtech.com RClamp3374N PRELIMINARY PROTECTION PRODUCTS Outline OutlineDrawing Drawing- -SO-8 SLP3020N10 A D B DIMENSIONS DIM PIN 1 INDICATOR (LASER MARK) A A1 A2 b b1 D E e e1 e2 L L1 N aaa bbb E A SEATING PLANE aaa C C A1 A2 MILLIMETERS MIN NOM MAX 0.50 0.60 0.65 0.00 0.03 0.05 (0.15) 0.15 0.20 0.25 0.25 0.35 0.45 2.90 3.00 3.10 1.90 2.00 2.10 0.60 BSC 0.65 BSC 0.95 BSC 0.25 0.30 0.35 0.95 1.00 1.05 10 0.08 0.10 D/2 3X b1 1 2 LxN 3X L1 L1 /2 E/2 N bxN e bbb C A B e1 e2 NOTES: 1. CONTROLLING DIMENSIONS ARE IN MILLIMETERS (ANGLES IN DEGREES). Land Pattern - SLP3020N10 P1 X1 P DIMENSIONS 0.50 (C) Y1 G Y Z DIM C G P P1 P2 X X1 Y Y1 Z MILLIMETERS (1.98) 1.40 0.60 0.65 0.95 0.25 0.40 0.58 1.00 2.56 P2 X NOTES: 1. CONTROLLING DIMENSIONS ARE IN MILLIMETERS (ANGLES IN DEGREES). 2. THIS LAND PATTERN IS FOR REFERENCE PURPOSES ONLY. CONSULT YOUR MANUFACTURING GROUP TO ENSURE YOUR COMPANY'S MANUFACTURING GUIDELINES ARE MET. © 2012 Semtech Corporation 8 www.semtech.com RClamp3374N PRELIMINARY PROTECTION PRODUCTS Marking Codes Ordering Information 3374N YYWW Part Number Working Voltage Qty per Reel R eel Size RClamp 3374N .TCT 3.3 Volts 3,000 7 Inch RailClamp and RClamp are trademarks of Semtech Corporation 1 YYWW = Date Code Carrier Tape Specification 3374N YYWW 3374N YYWW 3374N YYWW Pin 1 Location (Towards Sprocket Holes) User Direction of feed Device Orientation in Tape A0 2.24 +/-0.05 mm B0 K0 3.23 +/-0.05 mm Tape Width B, (Max) D 8 mm 4.2 mm 1.5 + 0.1 mm - 0.0 mm ) 0.93 +/-0.05 mm D1 E 0.5 mm ±0.05 1.750±.10 mm F K (MAX) P P0 P2 T(MAX) 3.5±0.05 mm 2.4 mm 4.0±0.1 mm 4.0±0.1 mm 2.0±0.05 mm 0.4 mm W 8.0 mm + 0.3 mm - 0.1 mm Contact Information Semtech Corporation Protection Products Division 200 Flynn Road, Camarillo, CA 93012 Phone: (805)498-2111 FAX (805)498-3804 © 2012 Semtech Corporation 9 www.semtech.com