RClamp 3354S Low Voltage RClamp Surge Protection for GbE Interfaces

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1 - RailClamp Description RailClamp TVS diodes are specifi cally designed to protect sensitive components which are connected to high-speed data and transmission lines from overvoltage cased by ESD (electrostatic discharge), CDE (cable discharge events), and EFT (electrical fast transients). The RClamp 3354S incorporates srge rated, low capacitance steering diodes and a TVS diode in a single package. Each device will protect p to for high-speed lines. The RClamp3354S can withstand a high level of srge crrent (25A, 8/2s) while maintaining a low loading capacitance of less than 5pF. The high srge capability means it can be sed in high threat environments in applications sch as Gigabit Ethernet, telecommnication lines, and LVDS interfaces. The RClamp3354S is constrcted sing Semtech s proprietary EPD process technology. The EPD process provides low stand-off voltages with signifi cant redctions in leakage crrent and capacitance over silicon-avalanche diode processes. It featres a low operating voltage of 3.3 volts for sperior protection. The RClamp3354S is in a 5-lead SOT-23 package. The leads are fi nished with lead-free matte tin. RClamp 3354S Low Voltage RClamp Srge Protection for GbE Interfaces Featres Transient protection for high-speed data lines to IEC (ESD) 3kV (air), 3kV (contact) IEC (EFT) 4A (5/5ns) IEC (Lightning) 25A (8/2µs) Array of srge rated diodes with internal TVS Diode Protects p to for I/O lines Low capacitance (<5pF) for high-speed interfaces Low Dynamic Resistance:.25 Ohms Low operating voltage: 3.3V Solid-state silicon-avalanche technology Mechanical Characteristics JEDEC SOT-23 5L package Pb-Free, Halogen Free, RoHS/WEEE Compliant Molding compond fl ammability rating: UL 94V- Marking : Marking code + date code Packaging : Tape and Reel Applications // Ethernet Central Offi ce Eqipment LVDS Interfaces MagJacks / Integrated Magnetics Notebooks / Desktops / Servers Circit Diagram Pin Configration * % ) * /*%)22 % ) /*%)2%2 /24/23

2 Absolte Maximm Ratings Rating Symbol Vale Units Peak Plse Power (tp = 8/2µs) P PK 4 W Peak Plse Crrent (tp = 8/2µs) I PP 25 A ESD per IEC (Air) 3 V ESD ESD per IEC (Contact) 3 kv Operating Temperatre T J -55 to +85 O C Storage Temperatre T STG -55 to +5 O C Electrical Characteristics (T=25 O C nless otherwise specified) Parameter Symbol Conditions Min. Typ. Max. Units Reverse Stand-Off Voltage V RWM 3.3 V Pnch-Throgh Voltage V PT I PT = 2µA V Snap-Back Voltage V SB I SB = 5mA 2.8 V Reverse Leakage Crrent I R V RWM = 3.3V, T=25 C.5 µa I PP = A, tp = 8/2µs Any I/O to Grond 5.5 Clamping Voltage V C I PP = A, tp = 8/2µs Any I/O to Grond V I PP = 25A, tp = 8/2µs Any I/O to Grond 6 Jnction Capacitance C J Between I/O pins and Grond V R = V, f = MHz Between I/O pins V R = V, f = MHz pf 23 Semtech Corporation. 2

3 RClamp3354S Typical Characteristics Non-Repetitive Peak Plse Power vs.plse Time Power Derating Crve 2 % of Rated Power or IPP Peak Plse Power - PPP (kw) DR452:25:25:5 DR Plse Dration - tp (µs) 25 ESD Clamping (+8kV Contact per IEC 6-4-2) ESD Clamping (-8kV Contact per IEC 6-4-2) 5 +8kV ESD Plse per IEC6-4-2 Corrected for 4dB attenation. Measred with 5Ω, 4dB attenator; 5Ω Scope Inpt Impedance Voltage (V) kV ESD Plse per IEC6-4-2 Corrected for 4dB attenation. Measred with 5Ω, 4dB attenator; 5Ω Scope Inpt Impedance - -5 AR_RC3354S_ESD -8kV AR_RC3354S_ESD +8kV Time (ns) Positive TLP Characteristic 4 Time (ns) 6 8 Negative TLP Characteristic 3 TLP Parameters tp = ns; tr = 2ps Pins, 3, 4 or 5 to Gnd TLP Parameters tp = ns; tr = 2ps Pins, 3, 4 or 5 to Gnd -5 TLP Crrent - IDUT (A) 25 TLP Crrent - IDUT (A) Voltage (V) 5 75 Ambient Temperatre - TA (OC) 2 5 RDYN =.9Ω Best Fit 4A to 6A - -5 RDYN =.34Ω Best Fit 4A to 6A AR_RC3354S_TLP- AR_RC3354S_TLP Clamping Voltage - VC (V) 23. Semtech Corporation Clamping Voltage - VC (V) -4-2

4 Typical Characteristics (Contined) 5 Typical Insertion Loss S2 Analog Crosstalk Pin to Pin5-2 Insertion Loss - IL (db) Crosstalk - CT (db) -4-2 Pin to Gnd AR_RC3354S_IL Freqency - f (MHz) -8 AR_RC3354S_CT Freqency - f (MHz) 5 4 Capacitance v Reverse Voltage (Line to GND) f = MHz.5 Capacitance v Reverse Voltage (Line to Line) f = MHz Capacitance - CJ (pf) 3 2 Capacitance - C J (pf)..5 AR_RC3354S_CAP (LG) Reverse Voltage - VR(V). AR_RC3354S_CAP (LL) Reverse Voltage - VR(V) 23 Semtech Corporation. 4

5 Applications Information Gigabit Ethernet Protection Soltions Ethernet systems with connections external to the bilding are sbject to high-level transient threats. This type of eqipment may even be reqired to meet the srge immnity reqirements of Telcordia GR-89. Reliable protection of the Ethernet transceiver reqires a device that can absorb the expected transient energy, clamp the incoming srge to a safe level, and yet remain transparent to the system nder normal operation. The RClamp3354S has been designed to meet these demanding reqirements. Transient Protection When designing Ethernet protection, the entire system mst be considered. An Ethernet port incldes interface magnetics in the form of transformers and common mode chokes. Transformers and chokes can be discrete components, bt integrated soltions that inclde 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, bt no protection for metallic (line-to-line) srges. Dring a metallic transient event, crrent will fl ow into one line, throgh the transformer and back to the sorce. As the crrent fl ows, it charges the windings of the transformer on the line side. Once the srge 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 magnitde and dration of the srge is attenated by the indctance of the magnetics. The amont of attenation will vary by vendor and confi gration of the magnetics. It is this transferred energy that mst be clamped by the protection circitry. 23. Semtech Corporation. 5

6 Otline Drawing - SOT-23 5L ' % + % /*%)2 ) -. %, %+% %++! +" '%+' ) %&&&&%%'%()*+%+'%%+ '++ Land Pattern - SOT-23 5L / / /*%)22 % + %, %+% %++! +" )+(%++(+'+%%/ %'/%'+'('+ +%'%'+/%'+ %/'('+ '+ 23 Semtech Corporation. 6

7 Marking Ordering Information Part Nmber Lead Finish Qty per Reel Reel Size RClamp3354S.TCT Matte Tin 3, 7 inch /*%)2-2 RailClamp and RClamp are Trademarks of Semtech Corporation YW = Alphanmeric character Date Code Tape and Reel Specification,! :3";:3(<= " -. >!,!8"9**5!5 6 D /*%)2/2 All dimensions in mm A B K B (Max) D D E F K (Max) P P P2 T (MAX) W 3.23 ± ±.5.37 ± ±.5.75 ±. 3.5 ± ±. 4. ±. 2. ± Contact Information Semtech Corporation Protection Prodcts Division 2 Flynn Rd., Camarillo, CA 932 Phone: (85)498-2 FAX (85) Semtech Corporation. 7