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PROTECTION PRODUCTS - RailClamp(R) Description
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(R)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.
(R)
RailClamp(R) 2.5V TVS for GbE Applications
Features
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 (1.2/50s) 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=8/20s) Low operating voltage: 2.5V Easy layout Solid-state silicon-avalanche technology
RCLAMP2502L
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
10/100/1000 Ethernet Interfaces CPE Equipment GPON Systems VoIP Phones Video Surveillance Systems
Functional Circuit Diagram
Package Configuration
1.27
Pin 1
Pin 8
4.00 6.00
1
2
Pin 2, 3, 6, 7
5.00 1.75
Pin 4
Pin 5
SO-8 (Max Dimensions in mm)
Revision 10/22/2009 1 www.semtech.com
RCLAMP2502L
PROTECTION PRODUCTS 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 800 40 25 15 -40 to +85 -55 to +150 Units Watts A kV C C
Electrical Characteristics (T=25oC)
R Clamp2502L Parameter Reverse Stand-Off Voltage Punch-Through Voltage Snap -Back Voltage Reverse Leakage Current Clamp ing Voltage Clamp ing Voltage Clamp ing Voltage Junction Cap acitance Symbol VRWM V PT VSB IR VC VC VC Cj IPT = 2A ISB = 50mA VRWM = 2.5V, T=25C IPP = 12A, tp = 8/20s Between p ins 1, 8 and 4,5 IPP = 24A, tp = 8/20s Between p ins 1, 8 and 4,5 IPP = 40A, tp = 8/20s Between p ins 1, 8 and 4,5 Between p ins 1,8 or 4,5 and 2,3 VR = 0V, f = 1MHz Between p ins 1, 8 and 4,5 VR = 0V, f = 1MHz 2.7 2.8 1 9.5 12.5 20 10 Conditions Minimum Typical Maximum 2.5 Units V V V A V V V pF
5
pF
(c) 2009 Semtech Corp.
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RCLAMP2502L
PROTECTION PRODUCTS Typical Characteristics
Non-Repetitive Peak Pulse Power vs. Pulse Time
10
110 100 90 80 70 60 50 40 30 20 10 0
Power Derating Curve
Peak Pulse Power - PPP (kW)
1
0.1 0.1 1 10 Pulse Duration - tp (us) 100 1000
% of Rated Power or PP I
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 td = IPP/2
PP
Normalized Junction Capacitance vs. Reverse Voltage (I/O to I/O)
2
Waveform Parameters: tr = 8s td = 20s e-t
Cj(VR) / Cj(VR=0V)
1.8 1.6 1.4 1.2 1 0.8 0.6 0.4 0.2 0 0 0.5 1 1.5 2 2.5
Percent of I
f = 1 MHz
Reverse Voltage - VR (V)
Clamping Voltage vs. Peak Pulse Current I/O to I/O
20
ESD Clamping (8kV Contact per IEC 61000-4-2)
Clamping Voltage - VC (V)
15
10
5
Waveform Parameters: tr = 8s td = 20s 0 5 10 15 20 25 30 35 40
0 Peak Pulse Current - IPP (A)
Note: Data is taken with a 10x attenuator (c) 2009 Semtech Corp. 3 www.semtech.com
RCLAMP2502L
PROTECTION PRODUCTS Typical Characteristics
Insertion Loss S21 (I/O to I/O)
CH1 S21 LOG 6 dB / REF 0 dB 1: -.1438 dB 174.506 MHz 0 dB
1 2 3
Insertion Loss S21 (I/O to Ground)
CH1 S21 LOG 6 dB / REF 0 dB 1: -.16500 dB 122.418 MHz 0 dB
1
5
2: -1.2515 dB 800 MHz 3: -3.1365 dB 1.30415 GHz
3
2: -2.6848 dB 800 MHz
5
-6 dB -12 dB -18 dB -24 dB -30 dB -36 dB
-6 dB -12 dB
2
3: -3.1819 dB 920.165M Hz 4: -13.925 dB 1.8 GHz 5: -5.4107 dB 2.7 GHz
4
4: -9.3869 dB 1.8 GHz 5: -2.1395 dB 2.7 GHz
4
-18 dB -24 dB -30 dB -36 dB
1 MHz START . 030 MHz
10 MHz
100 MHz
3 1 GHz GHz STOP 3000. 000000 MHz
1 MHz START . 030 MHz
10 MHz
100 MHz
3 1 GHz GHz STOP 3000. 000000 MHz
(c) 2009 Semtech Corp.
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RCLAMP2502L
PROTECTION PRODUCTS Applications Information
Device Connection Options for Protection of Two High-Speed Data Lines 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. 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 2s and a decay time of 10s 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.
Pin 1
Circuit Diagram
Pin 8
Pin 2, 3, 6, 7
Pin 4
Pin 5
Connection for Differential Protection (Line-to-Line)
1 8
Line in
Line out
Line in
4 5
Line out
(c) 2009 Semtech Corp.
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RCLAMP2502L
PROTECTION PRODUCTS Applications Information
TPA+
R1
1
C1
C5
TPA-
RCLAMP2502L D1
Gigabit Ethernet PHY
TPB+
R2
1
C2 RCLAMP2502L D2
C6
TPC+
R3
1
C3
C7
TPC-
RCLAMP2502L D3
TPD+
R4
1
C4 RCLAMP2502L D4
C8
TPD-
Schematic Diagram for Gigabit Ethernet Telcordia GR-1089 Intra-Building Protection (PHY Operating Temp 10/100 Ethernet PHY
TPA+
R1
1
D1
TPB+
R2
1
TPB-
RCLAMP2502L D2
Schematic Diagram for 10/100 Ethernet Telcordia GR-1089 Intra-Building Protection
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(c) 2009 Semtech Corp.
6
RJ-45
TPA-
RCLAMP2502L
Transformer
RJ-45
TPB-
Transformer
RCLAMP2502L
PROTECTION PRODUCTS Applications Information - Spice Model
D2 I/O D1 D3
RCLAMP2502L Spice Model
R Clamp2502L Spice Parameters Parameter IS BV VJ RS IB V CJO TT M N EG Unit Amp Volt Volt Ohm Amp Farad sec --eV D1 1E-14 100 0.6 0.09 1E-3 2E-12 2.541E-9 0.01 1.1 1.11 D2 1E-14 100 0.6 0.15 1E-3 2E-12 2.541E-9 0.01 1.1 1.11 D3 1.66E-13 2.89 0.53 0.06 1E-3 288E-12 2.541E-9 0.17 1.1 1.11
(c) 2009 Semtech Corp.
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RCLAMP2502L
PROTECTION PRODUCTS Outline Drawing - SOIC-8
DIMENSIONS INCHES MILLIMETERS MIN NOM MAX MIN NOM MAX
.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 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
A N 2X E/2 E1 E 1 ccc C 2X N/2 TIPS 2 e/2 B D aaa C SEATING PLANE A2 A C bxN bbb A1 C A-B D e D
DIM
A A1 A2 b c D E1 E e h L L1 N 01 aaa bbb ccc
h h
H GAGE PLANE 0.25
c
SEE DETAIL SIDE VIEW
NOTES: 1.
A
L (L1) DETAIL
01
A
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 Z C G P X Y Z
DIMENSIONS INCHES MILLIMETERS
(.205) .118 .050 .024 .087 .291 (5.20) 3.00 1.27 0.60 2.20 7.40
Y 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.
(c) 2009 Semtech Corp.
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RCLAMP2502L
PROTECTION PRODUCTS Marking Ordering Information
Part Number Working Voltage 2.5 Volts Qty per Reel 500 R eel Size 7 Inch
SC YYWW RC2502L CHINA
YYWW = Date Code
RClamp 2502L.TBT
RailClamp and RClamp are marks of Semtech Corporation
Tape and Reel Specification
User Direction of feed
Device Orientation in Tape
A0 6.50 +/-0.20 mm B0 5.40 +/-0.20 mm K0 2.00 +/-0.10 mm
Tape Width
B, (Max)
D
D1
E
F
K (MAX)
P
P0
P2
T(MAX)
W
12 mm
8.2 mm (.476)
1.5 + 0.1 mm - 0.0 mm
1.5 mm
1.750.10 mm
5.50.05 mm
4.5 mm
4.00.1 mm
4.00.1 mm
2.00.05 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
(c) 2009 Semtech Corp. 9 www.semtech.com

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