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1 www.semtech.com rclamp ? 1521pq ultra-low capacitance 1-line esd protection protection products - railclamp ? revised 3/15/2013 the railclamp family is a series of ultra low capacitance transient voltage suppressors (tvs) designed to protect high speed data interfaces. this series has been speci? - cally designed to protect sensitive components which are connected to high-speed data and transmission lines from overvoltage caused by esd (electrostatic dis- charge), cde (cable discharge events), and eft (electri- cal fast transients). the rclamp ? 1521pq has a maximum capacitance of only 0.5pf. this allows it to be used on circuits operat- ing in excess of 3ghz without signal attenuation. they may be used to meet the esd immunity requirements of iec 61000-4-2, level 4 (15kv air, 8kv contact dis- charge). the RCLAMP1521PQ is in a 2-pin, rohs/weee compli- ant, slp1006p2 package measuring 1.0 x 0.6 x 0.5mm. the leads are spaced at a pitch of 0.65mm and feature a lead-free ? nish. each device will protect one high- speed line operating at 15 volts. it gives the designer the ? exibility to protect single lines in applications where arrays are not practical. the combination of small size, low capacitance, and high esd surge capability makes them ideal for use in applications such as cellular phones and high-power usb. the RCLAMP1521PQ is quali? ed to aec-q100 grade 1 for automotive use. transient protection for data lines to u iec 61000-4-2 (esd) 15kv (air), 8kv (contact) iec 61000-4-4 (eft) 40a (tp = 5/50ns) cable discharge event (cde) ultra-small package (1.0 x 0.6 x 0.5mm). u protects one data or i/o line. u low capacitance: 0.3pf typical. u low clamping voltage. u low operating voltage: 15v. u solid-state silicon-avalanche technology. u aec-q100 grade1 quali? ed. u description package dimensions features applications schematic & pin con? guration slp1006p2 package. u molding compound ? ammability rating: ul 94v-0. u marking: marking code. u packaging : tape and reel. u lead finish: nipdau. u rohs/weee compliant u cellular handsets & accessories. u usb ports. u pci express. u serial ata. u automotive applications. u mechanical characteristics #1%-&-2%2 #7 7/- 7/ 7- #1%-&-2#2
2 ? 2013 semtech corporation. www.semtech.com RCLAMP1521PQ protection products absolute maximum ratings electrical characteristics (t=25 o c unless otherwise speci? ed) parameter symbol conditions min. typ. max. units reverse stand-off voltage v rwm t = -40 to +125c 15 v reverse breakdown voltage v br it = 1ma t = -40 to +125c 16.7 v reverse leakage current i r v rwm = 15v, t = 25c 1 ua t = 125c 5 clamping voltage v c i pp = 1a, tp = 8/20s 30 v clamping voltage v c i pp = 4a, tp = 8/20s 35 v junction capacitance c j v r = 0v, f = 1mhz t = 25c 0.30 0.50 pf t = 125c 1.00 rating symbol value units peak pulse power (tp = 8/20s) p pk 120 w peak pulse current (tp = 8/20s) i pp 4 a esd per iec 61000-4-2 (air) v esd 15 kv esd per iec 61000-4-2 (contact) 8 operating temperature t j -40 to +125 o c storage temperature t stg -55 to +150 o c
3 ? 2013 semtech corporation. www.semtech.com RCLAMP1521PQ protection products typical characteristics non-repetitivepeak pulse power vs. pulse time power derating curve reverse leakage vs. temperature reverse leakage vs. reverse voltage capacitance vs. temperature 0.0 0.5 1.0 1.5 -50 0 50 100 150 leakage current - i r (ua) temperature ( o c) v r = 15v ar_irvt 0.0 0.5 1.0 1.5 2.0 2.5 -50 0 50 100 150 junction capacitance - c j (pf) temperature ( o c) vr = 15v vr = 0v ar_cjvt 0.01 0.1 1 10 0.1 1 10 100 1000 peak pulse power - p pp (kw) pulse duration - tp (s) dr040412-120 t a = 25 o c 0 20 40 60 80 100 120 0 25 50 75 100 125 150 % of rated power or i pp ambient temperature - t a ( o c) dr040512:25:125:150 0.00 0.05 0.10 0.15 0.20 0 5 10 15 leakage current - i r (ua) reverse voltage - v r (v) t a = 25 o c ar_irvv 18 19 20 21 22 -50 0 50 100 150 breakdown voltage - v br (v) temperature ( o c) ir = 1ma ar-bvvt breakdown voltage vs. temperature
4 ? 2013 semtech corporation. www.semtech.com RCLAMP1521PQ protection products typical characteristics (continued) -100 0 100 200 300 400 -20 0 20 40 60 80 100 clamping voltage - v c (v) time (ns) t a = 25 o c corrected for 40db attenuation. measured with 50, 40db attenuator; 50 scope input impedance. ar_esd pos esd positive clamp (8kv contact per iec 61000-4-2) -400 -300 -200 -100 0 100 -20 0 20 40 60 80 100 clamping voltage - v c (v) time (ns) ar_esd neg t a = 25 o c corrected for 40db attenuation. measured with 50, 40db attenuator; 50 scope input impedance. esd negative clamp (8kv contact per iec 61000-4-2) 0 10 20 30 0 10 20 30 40 50 60 tlp current - i dut (a) clamping voltage - v c (v) t a = 25 o c typical either direction ar_tlp_bi rdyn = 1.07 4a to 16a tlp iv curve (typical either direction)
5 ? 2013 semtech corporation. www.semtech.com RCLAMP1521PQ protection products applications information device connection options these low capacitance tvs diodes are designed to provide common mode protection for one high-speed line or differential protection for one line pair. the device is bidirectional and may be used on lines where the signal polarity is positive and negative. circuit board layout recommendations for suppression of esd. good circuit board layout is critical for the suppression of esd induced transients. the following guidelines are recommended: place the tvs near the input terminals or connectors u to restrict transient coupling. minimize the path length between the tvs and the u protected line. minimize all conductive loops including power and u ground loops. the esd transient return path to ground should be u kept as short as possible. never run critical signals near board edges. u use ground planes whenever possible. u #1%-&-2&2 equivalent circuit diagram
6 ? 2013 semtech corporation. www.semtech.com RCLAMP1521PQ protection products applications information - spice model % # % # ; & 4<
#1%-&-2,2 RCLAMP1521PQ spice model RCLAMP1521PQ spice parameters parameter unit d1 (lcrd) d2 (lcrd) d3 (tvs) is (a) 1.0e-20 1.0e-20 2.0e-12 bv (v) 100 100 19.5 vj (v) 0.7 0.7 0.6 rs (ohm) 0.458 0.89 0.8 ibv (a) 1e-3 1e-3 1e-3 cjo (f) 0.4e-12 0.4e-12 56e-12 tt (s) 2.541e-9 2.541e-9 2.541e-9 m -- 0.01 0.01 0.23 n -- 1.1 1.1 1.1 eg (ev) 1.11 1.11 1.11
7 ? 2013 semtech corporation. www.semtech.com RCLAMP1521PQ protection products outline drawing - {insert package type} land pattern - {insert package type}

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8 ? 2013 semtech corporation. www.semtech.com RCLAMP1521PQ protection products marking tape and reel speci? cation ordering information note: lead ? nish is lead-free nipdau railclamp and rclamp are marks of semtech corporation. part number qty per reel reel size RCLAMP1521PQtct 3000 7 inch #1%-&-2-2 " !
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? contact information semtech corporation protection products division 200 flynn rd., camarillo, ca 93012 phone: (805)498-2111 fax (805)498-3804
9 ? 2013 semtech corporation. www.semtech.com RCLAMP1521PQ protection products date description by 1/8/2013 raised from pm document rclamp1521p.pmd rev 8/22/07 djr 1/30/2013 released to plm as preliminary djr 2/1/2013 corrected p1. date (was 2012); added high temp. parameters to electrical characteristics table. djr 3/1/2013 changed 8/20 clamping voltage. was 28v @ 1a; 30v @ 4a: is 30v @ 1a; 35v @ 4a: reason necessary for yield. djr 3/15/2013 added esd and tlp curves, raised to final; released to plm as final djr

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