1 4/15/2015 rclamp ? tvs diodes are designed to protect sensitive electronics from damage or latch-up due to esd. they are designed to replace multilayer varistors (mlvs) in portable applications such as cell phones, notebook computers, and other portable electronics. this device offers desirable characteristics for board level protection including fast response time, low operating and clamp - ing voltage, and no device degradation. rclamp ? 1851za is specifcally designed for protection of near field communications (nfc) interfaces. it features extremely good esd protection characteristics includ - ing a low typical dynamic resistance of 0.16 ohms, low peak esd clamping voltage, and high esd withstand voltage (+/-17kv contact per iec 61000-4-2). low typi - cal capacitance (0.35pf at vr=0v) means that harmon - ic distortion the the rf signal is minimized. this device is bidirectional and has a working voltage of 18v for use on nfc resonator circuits without signal clipping. RCLAMP1851ZA is in a 2-pin slp0603p2x3f package measuring 0.6 x 0.3 mm with a nominal height of only 0.25mm. leads are fnished with niau. the small pack - age gives the designer the fexibility to protect single lines in applications where arrays are not practical. the combination of small size and high esd surge capability makes them ideal for use in portable applications such as cellular phones, digital cameras, and tablet pcs. ? high esd withstand voltage: +/-17kv (contact) and +/- 20kv (air) per iec 61000-4-2 ? ultra-small package ? protects one high speed data line ? low esd clamping voltage ? working voltage: 18v ? low capacitance: 0.35pf typical ? low leakage current ? extremely low dynamic resistance: 0.16 ohms (typ) ? solid-state silicon-avalanche technology description package dimensions features applications schematic & pin confguration ? slp0603p2x3f package ? pb-free, halogen free, rohs/weee compliant ? nominal dimensions: 0.6 x 0.3 x 0.25 mm ? lead finish: niau ? marking: marking code ? packaging: tape and reel ? near field communication (nfc) lines ? rf signal lines ? cellular handsets ? tablets ? fm antenna mechanical characteristics 0.300 0.600 0.250 0.160 0.355 bsc 0.220 1 2 nominal dimensions in mm slp0603p2x3f (bottom view) www.semtech.com RCLAMP1851ZA ultra small rclamp ? 1-line, 18v esd protection protection products - railclamp ?
2 absolute maximum ratings electrical characteristics (t=25 o c unless otherwise specifed) rating symbol value units peak pulse current (tp = 8/20s) i pp 3 a esd per iec 61000-4-2 (air) (1) esd per iec 61000-4-2 (contact) (1) v esd 20 17 kv operating temperature t j -40 to +85 o c storage temperature t stg -55 to +150 o c notes 1)measured with a 40db attenuator, 50 ohm scope input impedance, 2ghz bandwidth. esd gun return path connected to esd ground plane. 2)transmission line pulse test (tlp) settings: tp = 100ns, tr = 0.2ns, i tlp and v tlp averaging window: t1 = 70ns to t2 = 90ns. 3)dynamic resistance calculated from i tlp = 4a to i tlp = 16a 4)device is electrically symmetrical parameter symbol conditions min. typ. max. units reverse stand-off voltage v rwm t = -40 to +85 o c 18 v breakdown voltage v br i br = 10a 18.5 22.5 26.5 v reverse leakage current i r v rwm = 18v <1 50 na esd clamping voltage 2 v c i pp = 4a tp = 0.2/100ns 5.5 v esd clamping voltage 2 v c i pp = 16a tp = 0.2/100ns 7. 5 v dynamic resistance 2, 3 r dyn tp = 0.2/100ns 0.16 ohms junction capacitance c j vr = 0v; f = 1mhz 0.35 0.45 pf ? 2015 semtech corporation. www.semtech.com RCLAMP1851ZA protection products
3 typical characteristics esd clamping (8kv contact per iec 61000-4-2) esd clamping (-8kv contact per iec 61000-4-2) tlp characteristic (positive pulse) tlp characteristic (negative pulse) capacitance vs. reverse voltage 0 0.1 0.2 0.3 0.4 0.5 0.6 0.7 0.8 0 4 8 12 16 20 junction capacitance - c j (pf) voltage (v) f ? =? 1mhz -10 0 10 20 30 40 50 60 70 80 90 100 -10 0 10 20 30 40 50 60 70 80 clamping voltage - v c (v) time (ns) measured ? with ?50? ohm ? scope? input impedance,? 2ghz ? bandwidth. ? corrected for ? 50? ohm,? 40db? attenuator. ? esd ?gun return ? path ? connected ? to ? esd ?ground ? plane. -90 -80 -70 -60 -50 -40 -30 -20 -10 0 10 -10 0 10 20 30 40 50 60 70 80 clamping voltage - v c (v) time (ns) measured ? with ? 50 ? ohm ? scope ? input impedance, ? 2ghz ? bandwidth. ? corrected for ? 50 ? ohm, ? 40db? attenuator. ? esd ? gun return ? path ? connected ? to ? esd ? ground? plane. -35 -30 -25 -20 -15 -10 -5 0 5 -25 -20 -15 -10 -5 0 tlp current (a) clamping voltage (v) transmission ? line ? pulse ? test (tlp) ? settings: t p =? 100ns, ? t r =? 0.2ns, i tlp and ? v tlp averaging ? window: t 1 =? 70ns ? to ? t 2 =? 90ns insertion loss - s21 (db) \5 \4.5 \4 \3.5 \3 \2.5 \2 \1.5 \1 \0.5 0 0 1 10 insertion ? loss ?\ il ? (db) frequency ? (ghz) -5 0 5 10 15 20 25 30 0 5 10 15 20 25 tlp current (a) clamping voltage (v) transmission ? line ? pulse ? test (tlp) ? settings: t p =? 100ns, ? t r =? 0.2ns, i tlp and ? v tlp averaging ? window: t 1 =? 70ns ? to ? t 2 =? 90ns ? 2015 semtech corporation. www.semtech.com RCLAMP1851ZA protection products
4 applications information esd protection of nfc interfaces the near field communication (nfc) antenna is usually connected to the nfc controller ic via contact points on the phone. these contact points are user accessable and therefore may be subjected to esd strikes. external protection (tvs) devices should be placed between the antenna and the nfc chip interface. the working volt - age of the tvs should be high enough as not to clip the nfc signal. additionaly, the capacitance of the device should be minimized in order to avoid harmonic disc - tortion of the rf signal. RCLAMP1851ZA meets these requirements and also features extremely low dynamic resistance resulting in low esd clamping voltage. the low dynamic resistance also helps insure protection for schottky diodes that may be used in the nfc circuit. RCLAMP1851ZA is designed to work on nfc circuits with ac signals as high as 18v. an example protection ciruit is shown below in figure 1. figure 1 - nfc protection example tx+ tx- rec RCLAMP1851ZA RCLAMP1851ZA antenna+ antenna- gnd nfc controller antenna matching ckt emi filter ckt antenna matching ckt emi filter ckt rx+ rx- c r ? 2015 semtech corporation. www.semtech.com RCLAMP1851ZA protection products
5 applications information assembly guidelines the small size of this device means that some care must be taken during the mounting process to insure reliable solder joint. the table below provides semtechs recom - mended assembly guidelines for mounting this device. the fgure at the right details semtechs recommended aperture based on the below recommendations. note that these are only recommendations and should serve only as a starting point for design since there are many factors that affect the assembly process. the exact manufacturing parameters will require some experimen - tation to get the desired solder application. assembly parameter recommendation solder stencil design laser cut, electro-polished aperture shape rectangular with rounded corners solder stencil thickness 0.100 mm (0.004") solder paste type type 4 size sphere or smaller solder reflow profile per jedec j-std-020 pcb solder pad design non-solder mask defined pcb pad finish osp or niau recommended mounting pattern 0.270 0.250 0.298 0.272 0.175 stencil aperture mounting pad package ? 2015 semtech corporation. www.semtech.com RCLAMP1851ZA protection products
6 outline drawing - slp0603p2x3f land pattern - slp0603p2x3f controlling dimensions are in millimeters (angles in degrees). notes: 1. aaa n e l e dim a 0.180 0.320 0.140 0.280 0.08 2 0.160 0.300 0.355 bsc millimeters max 0.240 0.265 dimensions min 0.200 nom 0.235 0.220 0.250 bottom view b d 0.580 0.620 0.600 bbb 0.10 d e a b aaa c c a seating plane e bbb cab top view a1 0.000 0.010 0.050 bxn a1 e/2 2x l r0.025 typ controlling dimensions are in millimeters (angles in degrees). this land pattern is for reference purposes only. consult your manufacturing group to ensure your notes: company's manufacturin g guidelines are met. dim y g millimeters 0.671 0.247 0.177 dimensions z x 0.272 x y z g ? 2015 semtech corporation. www.semtech.com RCLAMP1851ZA protection products
7 marking tape and reel specifcation ordering information notes: device is electrically symmetrical notes: 1) railclamp and rclamp are trademarks of semtech corporation. part number qty per reel reel size RCLAMP1851ZAtft 15000 7 t t t t contact information semtech corporation protection products division 200 flynn rd., camarillo, ca 93012 phone: (805)498-2111 fax (805)498-3804 ? 2015 semtech corporation. www.semtech.com RCLAMP1851ZA protection products
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