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PROTECTION PRODUCTS - RailClamp www..com Description
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).
RailClamp Low Capacitance TVS Diode Array
Features
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 (8/20s) 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
RCLAMP0504N
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
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
Circuit Diagram
Package Dimensions
2.00
1
Pin 5
2.00
Pin 1 Pin 3 Pin 4 Pin 6
0.65 BSC
Pin 2
0.60
Device Schematic
Revision 01/16/2008 1
6 Pin SLP package (Bottom Side View) Nominal Dimensions in mm
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RCLAMP0504N
PROTECTION PRODUCTS www..com Absolute Maximum Rating
R ating Peak Pulse Power (tp = 8/20s) Peak Pulse Current (tp = 8/20s) ESD p er IEC 61000-4-2 (Air) ESD p er IEC 61000-4-2 (Contact) Op erating Temp erature Storage Temp erature Symbol Pp k IP P VESD TJ TSTG Value 300 12 15 8 -55 to +125 -55 to +150 Units Watts A kV C C
Electrical Characteristics (T = 25oC)
R Clamp0504N Parameter Reverse Stand-Off Voltage Reverse Breakdown Voltage Reverse Leakage Current Forward Voltage Clamping Voltage Clamping Voltage Junction Capacitance Symbol VRWM V BR IR VF VC VC Cj Conditions Pi n 5 to 2 It = 1mA Pi n 5 to 2 VRWM = 5V, T=25C Pi n 5 to 2 If = 15mA IPP = 1A, tp = 8/20s Any I/O pin to Ground IPP = 5A, tp = 8/20s Any I/O pin to Ground VR = 0V, f = 1MHz Any I/O pin to Ground VR = 0V, f = 1MHz Between I/O pins 3 1.5 6 5 1.2 12.5 17.5 5 Minimum Typical Maximum 5 Units V V A V V V pF pF
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RCLAMP0504N
PROTECTION PRODUCTS www..com Typical Characteristics
Non-Repetitive Peak Pulse Power vs. Pulse Time
10 Peak Pulse Power - PPk (kW)
110 100 % of Rated Power or PP I 90 80 70 60 50 40 30 20 10
Power Derating Curve
1
0.1
0.01 0.1 1 10 Pulse Duration - tp (s) 100 1000
0 0 25 50 75 100 125 150 Ambient Temperature - TA (oC)
Pulse Waveform
110 100 90 80 70 60 50 40 30 20 10 0 0 5 10 15 Time (s) 20 25 30
0
PP
Clamping Voltage vs. Peak Pulse Current
25
Clamping Voltage - VC (V)
Waveform Parameters: tr = 8s td = 20s e-t
20
Percent of I
15
10
td = IPP/2
5
Waveform Parameters: tr = 8s td = 20s
0 2 4 6 8 10 12 14
Peak Pulse Current - IPP (A)
Forward Voltage vs. Forward Current
4 3.5 3 2.5 2 1.5 1 0.5 0 0 2 4 6 8 10 12 14
Normalized Capacitance vs. Reverse Voltage
1.5 1.4 1.3 1.2 1.1 1
Line-Line
Forward Voltage - V F (V)
CJ(VR) / C J(VR =0)
0.9 0.8 0.7 0.6 0.5 0.4 0.3 0.2 0.1 0 0 1 2 3 4 5 f = 1MHz
Line-Gnd
Waveform Parameters: tr = 8s td = 20s
Forw ard Current - IF (A)
Reverse Voltage - VR (V)
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RCLAMP0504N
PROTECTION PRODUCTS www..com Applications Information
Device Connection Options for Protection of Four High-Speed Data Lines 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: 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. 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: VC = VCC + VF VC = -VF (for positive duration pulses) (for negative duration pulses)
In 1 In 2
1
In 4 Vcc In 3
"Rail-T Pro Topology Figure 1 - "Rail-To-Rail" Pr o t ection Topology (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.
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: VC = VCC + VF + LP diESD/dt (for positive duration pulses) VC = -VF - LG diESD/dt (for negative duration pulses) ESD current reaches a peak amplitude of 30A in 1ns for a level 4 ESD contact discharge per IEC 61000-4-2.
In 1 In 2
1
In 4 NC In 3
4
2008 Semtech Corp.
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RCLAMP0504N
PROTECTION PRODUCTS www..com Applications Information (continued)
PIN Descriptions
Figure 2 - The Effects of Parasitic Inductance When Using Discrete Components to Implement Rail- To-Rail Pr o t ection Rail-T Pro Therefore, the voltage overshoot due to 1nH of series inductance is: 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: 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
Rail-T Pro Figure 3 - Rail- To-Rail Pr o t ection Using Arrays RailClamp RailClam p T V S Arra ys 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). 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.
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RCLAMP0504N
PROTECTION PRODUCTS
www..com Applications Information (continued)
RCLAMP0504N
RCLAMP0504N
Figure 4 - 10/100/1000 Ethernet Protection to IEC 61000-4-2
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RCLAMP0504N
PROTECTION PRODUCTS
www..com Applications Information - Spice Model
RCLAMP0504N Spice Model
R Clamp0504N Spice Parameters Parameter IS BV VJ RS IB V CJO TT M N EG Unit Amp Volt Volt Ohm Amp Farad sec --eV D1 (LCR D) 1E-20 180 0.63 0.195 1E-3 2E-12 2.541E-9 0.01 1.1 1.11 D2 (LCR D) 1E-20 20 0.59 0.357 1E-3 2E-12 2.541E-9 0.01 1.1 1.11 D3 (T VS) 8.57E-14 8 0.66 0.512 1E-3 277E-12 2.541E-9 0.231 1.1 1.11
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RCLAMP0504N
PROTECTION PRODUCTS
www..com SO-8 Outline Outline Drawing -SLP2020P6
A
E
B 1 E E/2
C 2 LxN
DIM
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
PIN 1 INDICATOR (LASER MARK) A2
D
N A e SEATING PLANE C bxN E/2 bbb CAB
aaa c A1
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
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
Z
G
F
(C)
Y
DIM B C F G P X Y Z
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.
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RCLAMP0504N
PROTECTION PRODUCTS www..com Marking Codes Ordering Information
Part Number RClamp 0504N .TCT Working Voltage 5V Qty per Reel 3,000 Reel Size 7 Inch
PIN 1 INDICATOR
0504N YYWW
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 2.25 +/-0.10 mm
K0 0.75 +/-0.10 mm
Device Orientation in Tape
Tape Width
B, (Max)
D 1.5 + 0.1 mm - 0.0 mm (0.59 +.005 - .000)
D1
E 1.750.10 mm (.069.004)
F
K (MAX)
P 4.00.1 mm (.157.004)
P0 4.00.1 mm (.157.004)
P2
T(MAX)
W 8.0 mm + 0.3 mm - 0.1 mm (.312.012)
8 mm
4.2 mm (.165)
0.8 mm 0.05 (.031)
3.50.05 mm (.138.002)
2.4 mm (.094)
2.00.05mm (.079.002)
0.4 mm (.016)
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

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