RClamp0504N RailClamp Low Capacitance TVS Diode Array PROTECTION PRODUCTS - RailClamp Description Features RailClamps are surge rated diode arrays designed to protect high speed data interfaces. The RClamp series has been specifically designed to protect sensitive components which are connected to data and transmission lines from overvoltage caused by electrostatic discharge (ESD), electrical fast transients (EFT), and lightning. The unique design of the RClamp series devices incorporates eight surge rated, low capacitance steering diodes and a TVS 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 downstream components. The RClampTM0504N 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 RClamp0504N is in a 6-pin, RoHS compliant, SLP2020P6 package. It measures 2.0 x 2.0 x 0.60mm. The leads are spaced at a pitch of 0.5mm and are finished with lead-free NiPdAu. Each device may be used to protect four high-speed data or transmission lines. They may be used to meet the ESD immunity requirements of IEC 61000-4-2, Level 4 (±15kV air, ±8kV contact discharge). 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 Mechanical Characteristics SLP2020P6 Package RoHS/WEEE Compliant Nominal Dimensions: 2.0 x 2.0 x 0.60 mm Lead Pitch: 0.65mm Lead Finish: NiPdAu Marking : Marking Code and Date Code Packaging : Tape and Reel Applications Circuit Diagram 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 Package Dimensions 2.00 1 Pin 5 2.00 Pin 1 Pin 3 Pin 4 Pin 6 0.65 BSC Pin 2 0.60 6 Pin SLP package (Bottom Side View) Nominal Dimensions in mm Device Schematic Revision 01/16/2008 1 www.semtech.com RClamp0504N PROTECTION PRODUCTS Absolute Maximum Rating R ating Symbol Value Units Peak Pulse Power (tp = 8/20µs) Pp k 300 Watts Peak Pulse Current (tp = 8/20µs) IP P 12 A ESD p er IEC 61000-4-2 (Air) ESD p er IEC 61000-4-2 (Contact) VESD 15 8 kV TJ -55 to +125 °C TSTG -55 to +150 °C Op erating Temp erature Storage Temp erature Electrical Characteristics (T = 25oC) R Clamp0504N Parameter Symbol Conditions Reverse Stand-Off Voltage VRWM Pi n 5 to 2 Reverse Breakdown Voltage V BR It = 1mA Pi n 5 to 2 Reverse Leakage Current IR VRWM = 5V, T=25°C Pi n 5 to 2 5 µA Forward Voltage VF If = 15mA 1.2 V Clamping Voltage VC IPP = 1A, tp = 8/20µs Any I/O pin to Ground 12.5 V Clamping Voltage VC IPP = 5A, tp = 8/20µs Any I/O pin to Ground 17.5 V Junction Capacitance Cj VR = 0V, f = 1MHz Any I/O pin to Ground 3 5 pF VR = 0V, f = 1MHz Between I/O pins 1.5 2008 Semtech Corp. 2 Minimum Typical Maximum Units 5 V 6 V pF www.semtech.com RClamp0504N PROTECTION PRODUCTS Typical Characteristics Non-Repetitive Peak Pulse Power vs. Pulse Time Power Derating Curve 110 100 90 % of Rated Power or PI P Peak Pulse Power - PPk (kW) 10 1 0.1 80 70 60 50 40 30 20 10 0.01 0 0.1 1 10 100 0 1000 25 50 Pulse Waveform 125 150 25 Waveform Parameters: tr = 8µs td = 20µs 90 80 70 20 Clamping Voltage - VC (V) 100 PP 100 Clamping Voltage vs. Peak Pulse Current 110 Percent of I 75 Ambient Temperature - TA (oC) Pulse Duration - tp (µs) e-t 60 50 40 td = IPP/2 30 20 15 10 Waveform Parameters: tr = 8µs td = 20µs 5 10 0 0 0 0 5 10 15 20 25 2 4 30 6 8 10 12 14 Peak Pulse Current - IPP (A) Time (µs) Normalized Capacitance vs. Reverse Voltage Forward Voltage vs. Forward Current 1.5 4 1.4 1.3 3.5 Line-Line 1.1 2.5 0.9 1 CJ(VR) / C J(VR =0) Forward Voltage - V F (V) 1.2 3 2 1.5 1 Waveform Parameters: tr = 8µs td = 20µs 0.5 2 4 6 8 10 12 0.6 0.5 0.4 0.2 f = 1MHz 0.1 0 0 14 1 2 3 4 5 Reverse Voltage - VR (V) Forw ard Current - IF (A) 2008 Semtech Corp. 0.7 0.3 0 0 Line-Gnd 0.8 3 www.semtech.com RClamp0504N PROTECTION PRODUCTS Applications Information Device Connection Options for Protection of Four High-Speed Data Lines 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 discrete diodes or diode arrays are configured for rail-torail 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 the reference voltage plus the VF drop of the diode. For negative events, the bottom diode will be biased when the voltage exceeds the VF of the diode. At first approximation, the clamping voltage due to the characteristics of the protection diodes is given by: This device 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 VF) 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 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 is connected at pin 5. The options for connecting the positive reference are as follows: VC = VCC + VF VC = -VF 1. To protect data lines and the power line, connect pin 5 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. In 1 1 (for positive duration pulses) (for negative duration pulses) In 4 Vcc In 2 In 3 Figure 1 - “RailTo-Rail” Pr o t ection TTopology opology “Rail-T Pro (First Approximation) 2. In applications where the supply rail does not exit the system, 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).3. In 1 1 However, for fast rise time transient events, the effects of parasitic inductance must also be considered as shown in Figure 2. Therefore, the actual clamping voltage seen by the protected circuit will be: In 4 VC = VCC + VF + LP diESD/dt (for positive duration pulses) VC = -VF - LG diESD/dt (for negative duration pulses) NC In 2 2008 Semtech Corp. ESD current reaches a peak amplitude of 30A in 1ns for a level 4 ESD contact discharge per IEC 61000-4-2. In 3 4 www.semtech.com RClamp0504N PROTECTION PRODUCTS Applications Information (continued) PIN Descriptions Figure 2 - The Effects of Parasitic Inductance When Using Discrete Components to Implement RailTo-Rail Pr o t ection Rail-T Pro Figure 3 - RailTo-Rail Pr o t ection Using Rail-T Pro RailClam p T V S Arra ys Arrays RailClamp Therefore, the voltage overshoot due to 1nH of series inductance is: ETHERNET PROTECTION Ethernet ICs are vulnerable to damage from electrostatic discharge (ESD), lightning, and cable discharge events (CDE). The internal protection in the PHY chip, if any, often is not enough due to the high energy of these disturbances. The fatal discharge can occur differentially across the transmit or receive line pair or between any line and ground (common mode). V = LP diESD/dt = 1X10-9 (30 / 1X10-9) = 30V Example: Consider a VCC = 5V, a typical VF of 30V (at 30A) for the steering diode and a series trace inductance of 10nH. The clamping voltage seen by the protected IC for a positive 8kV (30A) ESD pulse will be: Common mode and differential mode protection against ESD and CDE discharges can be achieved by connecting the RClamp0504N on the PHY side of the Ethernet circuit as shown in Figure 4. Pins 1, 3, 4, and 6 are connected to the transmit and receive line pairs. Since there is no Vcc connection at the connector, pin 5 of the RClamp0504N should not be connected. Pin 2 is connected to ground. This connection should be made directly to the ground plane. All path lengths should be kept as short as possible to minimize parasitic inductance. This configuration can be used to meet the ESD immunity requirements of IEC 61000-42 and cable discharge events. VC = 5V + 30V + (10nH X 30V/nH) = 335V This does not take into account that the ESD current is directed into the supply rail, potentially damaging any components that are attached to that rail. Also note that it is not uncommon for the VF of discrete diodes to exceed the damage threshold of the protected IC. This is due to the relatively small junction area of typical discrete components. It is also possible that the power dissipation capability of the discrete diode will be exceeded, thus destroying the device. The RailClamp is designed to overcome the inherent disadvantages of using discrete signal diodes for ESD suppression. The RailClamp’s integrated TVS diode helps to mitigate the effects of parasitic inductance in the power supply connection. During an ESD event, the current will be directed through the integrated TVS diode to ground. The maximum voltage seen by the protected IC due to this path will be the clamping voltage of the device. 2008 Semtech Corp. 5 www.semtech.com RClamp0504N PROTECTION PRODUCTS Applications Information (continued) RClamp0504N RClamp0504N Figure 4 - 10/100/1000 Ethernet Protection to IEC 61000-4-2 2008 Semtech Corp. 6 www.semtech.com RClamp0504N PROTECTION PRODUCTS Applications Information - Spice Model RClamp0504N Spice Model R Clamp0504N Spice Parameters 2008 Semtech Corp. Parameter Unit D1 (LCR D) D2 (LCR D) D3 (T VS) IS Amp 1E-20 1E-20 8.57E-14 BV Volt 180 20 8 VJ Volt 0.63 0.59 0.66 RS Ohm 0.195 0.357 0.512 IB V Amp 1E-3 1E-3 1E-3 CJO Farad 2E-12 2E-12 277E-12 TT sec 2.541E-9 2.541E-9 2.541E-9 M -- 0.01 0.01 0.231 N -- 1.1 1.1 1.1 EG eV 1.11 1.11 1.11 7 www.semtech.com RClamp0504N PROTECTION PRODUCTS Outline Drawing -SLP2020P6 - SO-8 Outline A B E C 1 2 E/2 E PIN 1 INDICATOR (LASER MARK) DIM LxN D N A2 e A SEATING PLANE aaa c A1 bxN bbb E/2 C C A B A A1 A2 b C D E e L N aaa bbb DIMENSIONS INCHES MILLIMETERS MIN NOM MAX MIN NOM MAX .020 .024 .026 .000 .001 .002 (.007) .007 .010 .012 .055 .061 .065 .028 .034 .038 .074 .079 .083 .025 BSC .011 .014 .016 6 .003 .003 0.50 0.60 0.65 0.00 0.03 0.05 (0.17) 0.20 0.25 0.30 1.40 1.55 1.65 0.71 0.86 0.96 1.90 2.00 2.10 0.65 BSC 0.30 0.35 0.40 6 0.08 0.08 NOTES: 1. CONTROLLING DIMENSIONS ARE IN MILLIMETERS (ANGLES IN DEGREES). 2. COPLANARITY APPLIES TO THE EXPOSED PAD AS WELL AS THE TERMINALS. Land Pattern -SLP2020P6 X P Z G F (C) Y DIM B C F G P X Y Z DIMENSIONS INCHES MILLIMETERS .065 1.65 (.075) (1.90) .034 0.86 .049 1.25 .026 0.65 .014 0.35 .026 0.65 .100 2.55 B NOTES: 1. THIS LAND PATTERN IS FOR REFERENCE PURPOSES ONLY. CONSULT YOUR MANUFACTURING GROUP TO ENSURE YOUR COMPANY'S MANUFACTURING GUIDELINES ARE MET. 2008 Semtech Corp. 8 www.semtech.com RClamp0504N PROTECTION PRODUCTS Marking Codes Ordering Information 0504N YYWW PIN 1 INDICATOR Part Number Working Voltage Qty per Reel Reel Size RClamp 0504N .TCT 5V 3,000 7 Inch Notes: 1) This is a lead-free, RoHs compliant product RailClamp and RClamp are marks of Semtech Corporation YYWW = Date Code (YY = Year, WW = Work Week) Tape and Reel Specification Pin 1 Location User Direction of feed A0 2.25 +/-0.10 mm B0 Device Orientation in Tape K0 2.25 +/-0.10 mm 0.75 +/-0.10 mm Tape Width B, (Max) D D1 8 mm 4.2 mm (.165) 1.5 + 0.1 mm - 0.0 mm (0.59 +.005 - .000) 0.8 mm ±0.05 (.031) E 1.750±.10 mm (.069±.004) F K (MAX) P P0 P2 T(MAX) W 3.5±0.05 mm (.138±.002) 2.4 mm (.094) 4.0±0.1 mm (.157±.004) 4.0±0.1 mm (.157±.004) 2.0±0.05mm (.079±.002) 0.4 mm (.016) 8.0 mm + 0.3 mm - 0.1 mm (.312±.012) Contact Information Semtech Corporation Protection Products Division 200 Flynn Road, Camarillo, CA 93012 Phone: (805)498-2111 FAX (805)498-3804 2008 Semtech Corp. 9 www.semtech.com