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Technical content

Features

Applications

The SLVU2.8 series was designed to protect low voltage, CMOS devices from ESD and lightning induced transients. There is a compensating diode in parallel with the low voltage TVS to protect one unidirectional line or a high speed data pair when two devices are paired together. These robust structures can safely absorb repetitive ESD strikes at ±30kV (contact discharge) per the IEC61000-4-2 standard and each structure can safely dissipate up to 40A (IEC61000-4-5, t P=8/20μs) with very low clamping voltages. Pinout Functional Block Diagram

  • ESD, IEC61 000-4-2, ±30kV contact, ±30kV air EFT, IEC61 000-4-4, 40A (5/50ns)
  • Lightning , IEC61 000-4-5, 40A (8/20μs)
  • L ow capacit ance of 2pF per line (Pin 2 to 1)
  • L ow leakage cur rent of 1μA (MAX) at 2.8V
  • Small SO T23-3 (JEDEC TO-236) pac kage saves
  • 10/100/1000 Ethernet WAN/LAN Equipment Switching S ystems
  • Desktops, Ser vers, and Notebooks
  • Analog Inputs Base St ations 1 2 1 2 RoHS Pb GREEN Ethernet PHY RJ-45 Connector NC NC Application Example See Application Example Detail section on page 135 for more information SLVU2.8 Series 2.8V 40A TVS Array

3©2012 Littelfuse, Inc. Specifications are subject to change without notice. Please refer to www.littelfuse.com/SPA for current information. TVS Diode Arrays (SPA™ Family of Products) Revision: February 15, 2012 SL VU2.8 Series SLVU2.8 Lightning Surge Protection - SLVU2.8 Series Product Characteristics Lead Plating Matte Tin Lead Material Copper Alloy Lead Coplanarity 0.0004 inches (0.102mm) Substitute Material Silicon Body Material Molded Epoxy Flammability UL 94 V-0 Notes : 1 . All dimensions are in millimeters 2. Dimensions include solder plating. 3. Dimensions are exclusive of mold flash & metal burr. Blo is f acing up f or mold and f acing do wn f or trim/f orm, i.e. re verse trim/f orm. 5. Package surface matte finish VDI 11-13. Time Temperature TP TL TS(max) TS(min) tP tL tS time to peak temperature PreheatPreheat Ramp-upRamp-up Ramp-downRamp-do Critical Zone TL to TP Critical Zone TL to TP Reflow Condition Pb – F ree assembly P re Heat - Temperature Min (Ts(min)) 150°C - Temperature Max (Ts(max)) 200°C - Time (min to max) (ts) 60 – 180 secs Average ramp up rate (Liquidus) Temp (TL) to peak 3°C/second max TS(max) to TL - Ramp-up Rate 3°C/second max Reflow - Temperature (TL) (Liquidus) 217°C - Temperature (tL) 60 – 150 seconds Peak Temperature (TP) 260+0/-5 °C Time within 5°C of actual peak Temperature (t p) 20 – 40 seconds Ramp-down Rate 6°C/second max Time 25°C to peak Temperature (TP) 8 minutes Max. Do not exceed 260°C Soldering Parameters NC Data Line Protection of one unidirectional line Low capacitance protection of one high speed data pair Ethernet PHY RJ-45 Connector NC NC Protection of one unidirectional data line is realized by connecting pin 3 to the protected line, and pins 1 and 2 to GND. In this configuration, the de vice presents a maximum loading capacitance of tens of picof arads. During positive transients, the internal TVS diode will conduct and steer current from pin 3 to 1 (GND), clamping the dat a line at or below the specifi ed voltages for the device (see Electrical Characteristics section). F or negativ e transients, the internal compensating diode is for ward biased, steering the current from pin 2 (GND) to 3. Application Example Detail Low capacitance protection of a high-speed data pair is realized by connecting two devices in antiparallel. As shown, pin 1 of the first device is connected to D1 and pin 2 is connected to D2. Additionally, pin 2 of the second device is connected to D1 and pin 1 is connected to D2. Pin 3 must be NC (or not connected) f or both de vices. When the potential on D1 ex ceeds the potential on D2 (by the rated standoff voltage), pin 2 on the second device will steer current into pin 1 . The compensating diode will conduct in the forward direction steering current into the avalanching TVS diode which is operating in the re verse direction. F or the opposite transient, the first device will beha ve in the same manner. In this two device arrangement, the total loading capacitance is two times the rated capacitance from pin 2 to pin 1 which will typically be muc h less than 1 0pF making it suit able f or high- speed dat a pair such as 10/100/1000 Ethernet. NC Data Line Protection of one unidirectional line Low capacitance protection of one high speed data pair

©2012 Littelfuse, Inc. Specifications are subject to change without notice. Please refer to www.littelfuse.com/SPA for current information. TVS Diode Arrays (SPA™ Family of Products) Revision: February 15, 2012 SL VU2.8 Series Lightning Surge Protection - SLVU2.8 Series Package Dimensions — SOT -23 Pins 3 JEDEC TO-236 Millimetres Inches Min Max Min Max A 0.89 1. 12 0.035 0.044 A1 0.01 0.1 0.0004 0.004 b 0.3 0.5 0.012 0.020 c 0.08 0.2 0.003 0.008 D 2.8 3.04 0.110 0.120 E 2.1 2.64 0.083 0.104 E1 1. 2 1. 4 0.047 0.055 e 0.95 BSC 0.038 BSC e1 1 .90 BSC 0.075 BSC L1 0.54 REF 0.021 REF M 2.29 .90 N 0.95 0.038 O 0.78 0.30 TYP P 0.78 0.30 TYP b E1 E e D A C M N O P Recommended Pad Layout Embossed Carrier T ape & Reel Specification — SOT23-3 Package [.009 ± .0005] .229 ± .013 [.028] 13.5º MAX8º MAX9º MAX .71 [.081] 2.06 .99 [.039].46 [.018] A0 K0 P0 P1 P D E F W Symbol Millimetres Inches Min Max Min Max A0 3.05 3.25 0.12 0.128 B0 2.67 2.87 0.105 0.113 D 3.9 4.1 0.153 0.161 D1 1 .95 2.05 0.788 0.792 E 1 .65 1 .85 0.065 0.073 F 3.45 3.55 0.136 0.14 K0 1. 12 1 .32 0.476 0.484 P 0.95 1 .05 0.037 0.041 P0 3.9 4.1 0.153 0.161 P1 1. 6 0.063 W 7. 9 8.3 0.311 0.327

Ordering Information

Part Number Package Marking Min. Order Qty. SLVU2.8HTG SOT23-3 U2.8 3000 Part Numbering System Part Marking System SLVU2.8 HT G Series Package H = SOT23-3 T= Tape & Reel G= Green U2.8 U 2.8 Product Series U = SLVU2.8 Voltage Level