uclamp2512t Lightning and ESD Protection for Gigabit Ethernet Interfaces PROTECTION PRODUCTS - MicroClamp Description Features

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1 - MicroClamp Description The μclamp 5T TVS diode is specifically designed to meet the performance requirements of Gigabit Ethernet interfaces. They are designed to protect sensitive PHY chips from damage or upset due to electrostatic discharge (ESD), lightning, electrical fast transients (EFT), and cable discharge events (CDE). The μclamp5t is constructed using Semtech s low voltage EPD process technology. The EPD process provides low operating voltages with significant reductions in leakage current and capacitance over siliconavalanche diode processes. The device features low variation in capacitance over bias for stable operation on GbE lines. This means the μclamp5t will introduce zero traffic frame errors on GbE interfaces up to a PHY temperature of 0 o C (00M Cat 5/5e Cable). The μclamp5t also features high surge capability and is designed to be placed between the magnetics and the PHY chip. In this configuration, the device can withstand intra-building lightning surges per Telcordia GR-089. The μclamp5t is in a 8-pin SLP00N8T package. It measures.0 x.0 x 0.4. The leads are spaced at a pitch of 0.5 and are finished with lead-free NiPdAu. Each device will protect two line pairs operating at.5 volts. It gives the designer the flexibility to protect multiple lines in applications where space is at a premium. The small size and easy layout of the uclamp5t make it ideal for use in RJ-45 connectors with integrated magnetics. Typical Application uclamp5t Lightning and ESD Protection for Gigabit Ethernet Interfaces Features High ESD withstand : +/-0kV (Contact/Air) per IEC Able to withstand over 000 ESD strikes per IEC Level 4 Flow-through design simplifies layout Protects two line pairs Low reverse current: 0nA typical (VR=.5V) Low variation in capacitance vs. bias voltage:.pf Typical (VR = 0 to.5v) Working voltage:.5v Solid-state silicon-avalanche technology Mechanical Characteristics SLP00N8T package Pb-Free, Halogen Free, RoHS/WEEE Compliant Nominal Dimensions:.0 x.0 x 0.4 Lead Finish: NiPdAu Molding compound flaability rating: UL 94V-0 Marking: Marking code Packaging: Tape and Reel Applications 0/00/000 Ethernet Integrated magnetics/rj-45 connectors LAN/WAN Equipment Security Cameras Industrial Controls Notebooks & Desktop Computers Schematic & PIN Configuration RJ-45 Connector TP4- TP+ TP- TP TP- TP+ TP- TP4+ Revision /8/00 GBE Integrated Magnetics Module SLP00N8T

2 uclamp5t Absolute Maximum Rating Rating Symbol Value Units Peak Pulse Power (tp = 8/0μs) M aximum Peak Pulse Current ( tp = 8/0μs) P pk 00 Watts I pp 0 Amps ESD per IEC ESD per IEC (Air) (Contact) V ESD +/- 0 +/- 0 kv Operating Temperature T J -40 to +85 C Storage Temperature T STG 55 to C Electrical Characteristics (T=5 o C) Parameter Symbol Conditions Minimum Typical Maximum Units Reverse Stand-Off V WM R. 5 V Punch-Through Snap-Back V PT V SB I PT I SB = μa V = 50mA. 8 V Reverse Leakage Current I R V RWM =.5V μa Clamping V C I PP = A, tp = 8/0μs 4. 8 V Clamping V C I PP = 0A, tp = 8/0μs 0. V Variation in capacitance with reverse bias Pins, 8 to, 7 and pins, 6 to 4, 5 VR = 0 to.5v f = MHz. pf Pins, 8 to, 7 and Junction Capacitance C j pins, 6 to 4, 5 =.5V, f = MHz V R pf Notes: ) This parameter guaranteed by design and characterization and is not production tested 00 Semtech Corp.

3 uclamp5t Non-Repetitive Peak Pulse Power vs. Pulse Time Clamping vs. Peak Pulse Current 0 9 Peak Pulse Power - P PP (kw) Pulse Duration - tp ( s) Clamping -V C (V) Waveform Parameters: tr = 8µs td = 0µs Peak Pulse Current - I PP (A) Normalized Junction Capacitance vs. Reverse Typical Insertion Loss (S) CH S LOG 6 db / REF 0 db : db 800 MHz Cj(V R ) / Cj(V R =0V) db -6 db - db -8 db -4 db -0 db 4 5 : -.47 db 900 MHz : db.8 GHz 4: db.5 GHz 0. f = MHz Reverse (V R) -6 db -4 db -48 db MHz 0 MHz 00 MHz GHz GHz START. 00 MHz STOP MHz ESD Clamping (8kV Contact per IEC ) ESD Clamping (-8kV Contact per IEC ) Note: Data is taken with a 0x attenuator Note: Data is taken with a 0x attenuator 00 Semtech Corp.

4 uclamp5t Applications Information 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 iunity requirements of Telcordia GR 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 uclamp5t has been designed to meet these demanding requirements. Typical IEEE 80. template test results for a GbE circuit with uclamp5t are shown in Figure. Transient Protection When designing Ethernet protection, the entire system must be considered. An Ethernet port includes interface magnetics in the form of transformers and coon 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 coon 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 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. A typical protection scheme which utilizes the uclamp5t is shown in Figure. 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 coon mode lightning surges. High voltage capacitors and resistors are coonly 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 uclamp5t. The uclamp5t 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. TP+ RJ-45 Connector TP4- TP- TP+ TP- TP+ TP- TP4+ Ethernet PHY Figure - GbE Protection to Lightning, ESD, and CDE 00 Semtech Corp. 4

5 uclamp5t Applications Information Point A Point B Point C Point D Point F Point H Figure - Typical IEEE 80. Template Test Results (With uclamp5t) 00 Semtech Corp. 5

6 uclamp5t Applications Information - Spice Model Spice Model uclamp5t Spice Parameters Parameter IS BV VJ RS IBV CJO TT U nit D (TVS) D (TVS) Amp E-0 E-0 Volt.. Volt Ohm Farad E- E- Amp E- E- sec.54e- 9.54E- 9 M N --.. EG ev.. 00 Semtech Corp. 6

7 uclamp5t Outline Drawing - SLP00N8T aaa C A PIN INDICATOR (LASER MARK) A D A B E A C SEATING PLANE DIMENSIONS MILLIMETERS DIM MIN NOM MAX A A A (0.) 0.05 b D E e 0.50 BSC L R N 8 aaa bbb E/ LxN R N e/ bxn bbb C A B e D/ NOTES:. CONTROLLING DIMENSIONS ARE IN MILLIMETERS (ANGLES IN DEGREES). Land Pattern - SLP00N8T (C) G P/ P X Y Z DIMENSIONS DIM MILLIMETERS C (0.90) G 0.5 P 0.50 X 0.0 Y 0.65 Z.55 NOTES:. CONTROLLING DIMENSIONS ARE IN MILLIMETERS (ANGLES IN DEGREES).. THIS LAND PATTERN IS FOR REFERENCE PURPOSES ONLY. CONSULT YOUR MANUFACTURING GROUP TO ENSURE YOUR COMPANY'S MANUFACTURING GUIDELINES ARE MET. 00 Semtech Corp. 7

8 uclamp5t Marking Code Ordering Information PIN INDICATOR YYWW = Date Code 5T YYWW Part Number uclamp5t.tct Working Qty per Reel Reel Size.5V,000 7 Inch Notes: ) MicroClamp, uclamp and μclamp are trademarks of Semtech Corporation Tape and Reel Specification Pin Location User Direction of feed Device Orientation in Tape A0 B0 K0. +/ / /-0.05 Tape Width B, (Max) D D E F P P0 P T W 8 4. (.65) ( ) 0.4 ±0.5 (.0).750±.0 (.069±.004).5±0.05 (.8±.00) 4.0±0.0 (.57±.00-4) 4.0±0. (.57±.00-4).0±0.05 (.079±.00) 0.54±0.0 (.06) (.±.0) Contact Information Semtech Corporation Protection Products Division 00 Flynn Rd., Camarillo, CA 90 Phone: (805)498- FAX (805) Semtech Corp. 8

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