TClamp2472S. Low Capacitance TransClamp Surge Protection for xdsl Interfaces. PROTECTION PRODUCTS Description. Features. Mechanical Characteristics

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1 Low apacitance Translamp Surge Protection for xdsl Interfaces PROTETION PRODUTS Description Tlamp 47S is specifically designed to provide secondary surge and ESD protection for lass-h VDSL line drivers. integrates low capacitance, surge-rated steering diodes with a high power transient voltage suppressor (TVS). The TVS utilizes snap-back or crow-bar technology to minimize device clamping voltage and features high surge current capability of A (tp=8/us). capacitance is limited to 3.pF maximum with a typical capacitance variation of.pf over the operating voltage range. This ensures correct signal transmission on VDSL lines. The biased bridge structure allows the device to be used in VDSL applications that utilize asymetrical lass-h line drivers with operating voltages up to 4Vp-p. is in a -pin SOT-3 package. The leads are finished with lead-free matte tin. The flow- through package design simplifies PB layout. Features Transient Protection to IE -4- (ESD) Level 4 IE -4-4 (EFT) kv (/ns) IE -4- (Lightning) A (8/µs) Bias diodes prevent charging of TVS capacitance Working Voltage: 4V Low apacitance: 3.pF Maximum apacitance variation <.pf (V to 4V) Solid-State Silicon-Avalanche Technology Mechanical haracteristics JEDE SOT-3 L package Pb-Free, Halogen Free, RoHS/WEEE ompliant Nominal Dimensions:. x. x.4 mm Lead Finish: matte Tin Molding ompound Flammability Rating: UL 94V- Marking : Marking ode + Date ode Packaging : Tape and Reel Applications ADSLx / VDSLx Secondary Protection VDSL lass-h Line Driver Secondary Protection Modems Access Equipment entral Office Equipment ustomer Premise Equipment ircuit Diagram Pin onfiguration Line A 3 - Bias + Bias Line B 3 4 Final Datasheet Rev. April 7, Page

2 Absolute Maximum Ratings Rating Symbol Value Units Peak Pulse Power (tp =./µs) P PK W Peak Pulse urrent (tp =./µs) I PP A ESD per IE -4- (ontact) (), (3) V ESD ±8 kv Operating Temperature T J -4 to +8 O Storage Temperature T STG - to + O Electrical haracteristics (T= O unless otherwise specified) Parameter Symbol onditions Min. Typ. Max. Units Reverse Stand-Off Voltage V RWM -4 O to 8 O Pin to Pin, Pin 3 to Pin, Reverse Breakdown Voltage V BR I BR = ma, T = -4 O to 8 O Reverse Leakage urrent I R V RWM = 4V 4 V V T = O.. μa T = 8 O.. μa Holding urrent (3) I H ma (), (3) lamping Voltage V I PP = A, tp =./µs, 8/µs ombination Waveform I PP = A, tp =./µs, 8/µs ombination Waveform Breakover Voltage (3) V BO I BO = ma Junction apacitance J V R = V, f = MHz Pin to or Pin 3 to Pin V R = V, f = MHz Variation in Junction V D R = V - 4V, f = MHz apacitance (3) J T = O V 7. V 3 V 3. pf. pf.. pf Notes: (): ESD Gun return path to Ground Reference Plane (GRP) (): Measured using a./us voltage, 8/us current combination waveform, RS = 8 Ohms. lamping is defined as the peak voltage across the device after the device snaps back to a conducting state. (3): Guaranteed by design. Not production tested Final Datasheet Rev. April 7, Page

3 Typical haracteristics Non-Repetitive Peak Pulse Power vs. Pulse Time Power Derating urve % of Rated Peak Pulse urrent (IPP) Peak Pulse Power - PPP (kw) TA = O Waveform Parameters:./µS (Voltage) / 8/µS (urrent) combination waveform with 8Ω Source Impedance BR944::8: DR44-. Pulse Duration - tp (µs) lamping haracteristic (A, ombination Waveform) Time (µs) apacitance - j (pf) apacitance - j (pf). Pin to or Pin 3 to. Pin to 3.. Final Datasheet April 7, Reverse Voltage - VR (V) Rev. 4 Time (µs) f = MHz T = o apacitance vs. Temperature 3.. apacitance vs. Reverse Voltage. Waveform Parameters:./µs (Voltage) / 8/µS (urrent) combination waveform with 8Ω source impedance. Injected current = A 3 lamping Voltage - Vc(V) lamping Voltage - Vc(V) 3 7 Ambient Temperature - TA (O) lamping haracteristic (A, ombination Waveform) Waveform Parameters:./µs (Voltage) / 8/µS (urrent) combination waveform with 8Ω source impedance. Injected current = A 3 VR = V f = MHz Pin to Temperature - TA (o) 7 9 Page 3

4 Typical haracteristics ESD lamping (+8kV ontact per IE -4-), Pin to 3 ESD lamping (-8kV ontact per IE -4-), Pin to 3 Measured with Ohm scope input impedance, GHz bandwidth. orrected for Ohm, 4dB attenuator. ESD gun return path connected to ESD ground plane. Voltage (V) Voltage (V) Time (ns) - Measured with Ohm scope input impedance, GHz bandwidth. orrected for Ohm, 4dB attenuator. ESD gun return path connected to ESD ground plane Time (ns) Device Operation This device utilizes a multi-junction structure that is designed to switch to a low voltage state when triggered by ESD, EOS, or other transient events. During normal operation, the device will present a high-impedance to the circuit for voltage up to the working voltage (V RWM ) of the device. When the voltage across the device terminals exceeds the breakdown voltage (V BR ), avalanche breakdown occurs in the blocking junction causing the device to snap-back or switch to a low impedance on-state. This has the advantage of lowering the overall clamping voltage (V ) as ESD peak pulse current (I PP ) flows through the device. Once the current decreases below the holding current (I H ), the device will return to a high-impedance off-state. urrent (ma) Typical Low urrent IV haracteristic Turn Off Turn On Transmission Line Pulse Test (TLP) Settings: t p = ns, t r =.ns, I TLP and V TLP averaging window: t = 7ns to t = 9ns DUT Voltage (V) haracteristic urve Table - Parameter Definition IPP Symbol V RWM V BR V I H I R I PP Parameter Maximum Working Voltage Breakdown Voltage lamping Voltage Holding urrent Reverse Leakage urrent Peak Pulse urrent IH IR VH V Snap-Back VRWM VBR Final Datasheet Rev. April 7, Page 4

5 Applications Information VDSL Protection Design is designed to protect VDSL interfaces from transient over-voltages which result from lightning and ESD. An example of how to implement the for secondary (line driver side) protection is shown in Figure below. When connected as shown, it will limit the differential voltage across the driver inputs during ESD and high current surge events. Pins and 3 of the device are connected directly to the transmit and receive lines. Steering diodes at these pins route the surge current through the internal transient voltage suppressor (TVS). Pins and are connected to the voltage supply lines via resistors R and R. This connection serves to limit capacitance fluctuation of the TVS. The resistors should be large enough value as to minimize leakage current (typically Meg Ohm). For single supply applications, only one resitor (R) would be needed. Depending on immunity requirements, A primary protection device, such as a gas discharge tube (GDT), may be required to limit the voltage (and thus current) delivered to the line side of the transformer. Series resistors (RS) with a value of - Ohms may be needed to reduce current flow into the driver I. V RS R VDSL Driver RS 3 R VEE Figure - Typical VDSL Protection ircuit Device onnection and PB Routing The flow-through design of simplifies board layout and PB trace routing. Figure shows an example of how to connect the differential lines and bias voltages to the device. Line A is connected at pin and its trace can continue under the part and connect to pin, which is not connected internally to the part. A similar connection can be made for Line B. This layout makes it easy to keep the differential signal traces symmetrical. Bias voltage should be applied at pins (positive polarity voltage) and (negative polarity voltage). For single supply applications, Pin can be connected to ground. Line A Bias Line B 3 4 Bias Figure - Layout Diagram Final Datasheet Rev. April 7, Page

6 Outline Drawing - SOT-3 L X E/ ccc X N/ TIPS aaa SEATING PLANE A N B bxn bbb A-B D D SIDE VIEW e A DIMENSIONS DIM MILLIMETERS MIN NOM MAX e A D A. -. A.9..3 b. -. c.8 -. E E D E...7 E e.8 BS.9 BS e.9 BS L.3.4. L (.) N - aaa. bbb. ccc. A A SEE DETAIL A GAUGE PLANE. H DETAIL A L (L) c NOTES:. ONTROLLING DIMENSIONS ARE IN MILLIMETERS (ANGLES IN DEGREES).. DATUMS -A- AND -B- TO BE DETERMINED AT DATUM PLANE -H- 3. DIMENSIONS "E" AND "D" DO NOT INLUDE MOLD FLASH, PROTRUSIONS OR GATE BURRS. Land Pattern - SOT-3 L X () P Y G Z DIM G P X Y Z DIMENSIONS MILLIMETERS (.) NOTES:. ONTROLLING DIMENSIONS ARE IN MILLIMETERS (ANGLES IN DEGREES).. THIS LAND PATTERN IS FOR REFERENE PURPOSES ONLY. ONSULT YOUR MANUFATURING GROUP TO ENSURE YOUR OMPANY'S MANUFATURING GUIDELINES ARE MET. Final Datasheet Rev. April 7, Page

7 Marking ode 4 3 Notes: YW = Alphanumeric character Date ode Tape and Reel Specification t Ø D P P E F W 4 YW 4 YW 4 YW B K A P ØD Pin Marker User Direction of feed DR93-3 R Tape Width 8. ±. D D E F K (Max) P P P T (Max) mm mm mm mm mm mm mm mm mm mm. ±..7 ±. 3. ± ±. 4. ±.. ±. W Ordering Information Part Number Qty per Reel Reel Size.TT 3 7 Inch Translamp and Tlamp are registered trademarks of orporation. Final Datasheet Rev. April 7, Page 7

8 IMPORTANT NOTIE Information relating to this product and the application or design described herein is believed to be reliable, however such information is provided as a guide only and assumes no liability for any errors in this document, or for the application or design described herein. reserves the right to make changes to the product or this document at any time without notice. Buyers should obtain the latest relevant information before placing orders and should verify that such information is current and complete. warrants performance of its products to the specifications applicable at the time of sale, and all sales are made in accordance with s standard terms and conditions of sale. SEMTEH PRODUTS ARE NOT DESIGNED, INTENDED, AUTHORIZED OR WARRANTED TO BE SUITABLE FOR USE IN LIFE-SUPPORT APPLIATIONS, DEVIES OR SYSTEMS, OR IN NULEAR APPLIATIONS IN WHIH THE FAILURE OULD BE REASONABLY EXPETED TO RESULT IN PERSONAL INJURY, LOSS OF LIFE OR SEVERE PROPERTY OR ENVIRONMENTAL DAMAGE. INLUSION OF SEMTEH PRODUTS IN SUH APPLIATIONS IS UNDERSTOOD TO BE UNDERTAKEN SOLELY AT THE USTOMER S OWN RISK. Should a customer purchase or use products for any such unauthorized application, the customer shall indemnify and hold and its officers, employees, subsidiaries, affiliates, and distributors harmless against all claims, costs damages and attorney fees which could arise. The name and logo are registered trademarks of the orporation. All other trademarks and trade names mentioned may be marks and names of or their respective companies. reserves the right to make changes to, or discontinue any products described in this document without further notice. makes no warranty, representation or guarantee, express or implied, regarding the suitability of its products for any particular purpose. All rights reserved. ontact Information orporation Flynn Road, amarillo, A 93 Phone: (8) 498-, Fax: (8) Final Datasheet Rev. April 7, Page 8