1 ?2012 littelfuse, inc. specifcations 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 slvu2.8 series slvu2.8 lightning surge protection - slvu2.8 series description 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 =8/20s) 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 (8/20s) ? l ow capacit ance of 2pf per line (pin 2 to 1) ? l ow leakage cur rent of 1a (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 3 3 1 2 rohs pb green ethe rnet ph y j1 j8 rj -4 5 co nn ecto r nc nc application example see application example detail section on page 135 for more information slvu2.8 series 2.8v 40a tvs array
?2012 littelfuse, inc. specifcations are subject to change without notice. please refer to www.littelfuse.com/spa for current information. 2 tvs diode arrays (spa ? family of products) revision: february 15, 2012 slvu2.8 series lightning surge protection - slvu2.8 series absolute maximum ratings parameter rating units peak pulse power (t p =8/20s) 600 w peak pulse current (t p =8/20s) 40 a operating temperature -40 to 85 oc storage temperature -60 to 150 oc electrical characteristics (t op = 25c) parameter symbol test conditions min typ max units reverse standoff voltage v rwm i r 1a 2.8 v reverse breakdo wn volt age v br i t =2a 3.0 v snap b ack volt age v sb i t =50ma 2.8 v reverse leakage current i leak v r =2.8v (pin 2 or 3 to 1) 1 a clamping voltage 1 v c i pp =5a, t p =8/20s (pin 3 to 1) 5.7 7. 0 v clamping voltage 1 i pp =24a, t p =8/20s (pin 3 to 1) 8.3 12.5 v clamping voltage 1 i pp =5a, t p =8/20s (pin 2 to 1) 7. 0 8.5 v clamping voltage 1 i pp =24a, t p =8/20s (pin 2 to 1) 13.9 15.0 v dynamic resistance r dyn (v c2 - v c1 ) / (i pp2 - i pp1 ) (pin 2 to 1) 0.4 esd withst and volt age 1 v esd iec61000-4-2 (contact) 30 kv iec61000-4-2 (air) 30 kv diode capacitance 1 c d v r =0v, f=1mhz (pin 2 to 1) 2.0 2.5 pf caution: stresses above those listed in absolute maximum ratings may cause permanent damage to the device. this is a stress only rating and operation of the device at these or any other conditions above those indicated in the operational sections of this specifcation is not implied. note: 1 parameter is guaranteed by design and/or device characterization. figure 2: clamping voltage vs. i pp figure 1: capacitance vs. reverse voltage figure 3: pulse waveform 0.0 0.5 1.0 1.5 2.0 2.5 3.0 3.5 4.0 0.0 0.5 1.0 1.5 2.0 2.5 dc bias (v) capacitance (pf) 0% 10 % 20% 30% 40% 50% 60% 70% 80% 90% 10 0% 11 0% 0.0 5.0 10.0 15.0 20.0 25.0 30.0 time (s) pe rc e nt of i pp 0 2 4 6 8 10 12 14 05 10 15 20 25 peak pulse current-i pp (a) clamping voltage-v c (v)
3 ?2012 littelfuse, inc. specifcations 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 slvu2.8 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 fash & metal burr. 4. 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 fnish vdi 11-13. ti me temperature t p t l t s(max) t s(min) 25 t p t l t s time to peak temperature preheat p rehea t ramp-up r amp-up ramp-down r amp-d o critical zone t l to t p c ritical zon e t l to t p refow condition pb C f ree assembly p re heat - temperature min (t s(min) ) 150c - temperature max (t s(max) ) 200c - time (min to max) (t s ) 60 C 180 secs average ramp up rate (liquidus) temp (t l ) to peak 3c/second max t s(max) to t l - ramp-up rate 3c/second max refow - temperature (t l ) (liquidus) 217c - temperature (t l ) 60 C 150 seconds peak temperature (t p ) 260 +0/-5 c time within 5c of actual peak temperature (t p ) 20 C 40 seconds ramp-down rate 6c/second max time 25c to peak temperature (t p ) 8 minutes max. do not exceed 260c soldering parameters nc data line protection of one unidirectional line low capacitance protection of one high speed data pair d1 d2 ethe rnet ph y j1 j8 rj -4 5 co nn ecto r 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 confguration, 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 specif 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 frst 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 frst 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 d1 d2
?2012 littelfuse, inc. specifcations are subject to change without notice. please refer to www.littelfuse.com/spa for current information. 4 tvs diode arrays (spa ? family of products) revision: february 15, 2012 slvu2.8 series lightning surge protection - slvu2.8 series package dimensions sot-23 package sot23-3 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 3 e1 e 2 1 e e1 d a a1 c l1 m n o p recommended pad layout embossed carrier tape & reel speci?cation sot23-3 package [.009 .0005] .229 .013 [.028] 13.5o max 8o max 9o max .71 [.081] 2.06 .99 [.039] .46 [.018] a 0 k 0 b 0 p0 p1 p d d1 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 h t g series package h = sot23-3 t= tape & reel g= green u2.8 u 2.8 product series u = slvu2.8 voltage level
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