protection products preliminary 1 www.semtech.com protection products LCDA15-1 low capacitance tvs diode array description features circuit diagram schematic & pin configuration revision 2/18/2002 the LCDA15-1 is a low capacitance transient voltage suppressor (tvs) diode array. it is designed to protect sensitive cmos ics from the damaging effects of esd and lightning. each device will protect one line in common (line-to-ground) mode. they are low capaci- tance (< 15pf) making them suitable for use on high- speed telecom and datacom interfaces without signal degradation. the configuration of the LCDA15-1 has been optimized for easy layout on high density boards. the small sot- 143 package minimizes required board space. these devices will handle up to 15 amps for an 8/20s lightning impulse. the low inductance construction minimizes voltage overshoot during high current surges. the LCDA15-1 may be used to protect adsl inter- faces, portable electronics, and wireless systems. applications mechanical characteristics ? adsl interfaces ? serial/parallel interfaces ? high-speed data lines ? portable electronics ? wan/lan equipment ? wireless systems ? esd protection to iec 61000-4-2, level 4 ? lightning protection per iec 61000-4-5 (15a, tp=8/20s) ? configuration optimized for easy board layout ? protects one line ? low capacitance (<15pf) for high-speed interfaces ? low clamping voltage ? low leakage current ? operating voltage: 15v ? solid-state silicon-avalanche technology ? jedec sot-143 package ? molding compound flammability rating: ul 94v-0 ? marking : marking code ? packaging : tape and reel per eia 481 sot-143 (top view)
2 ? 2002 semtech corp. www.semtech.com protection products protection products LCDA15-1 absolute maximum rating electrical characteristics g n i t a rl o b m y se u l a vs t i n u ) s 0 2 / 8 = p t ( r e w o p e s l u p k a e pp k p 0 0 5s t t a w ) s 0 2 / 8 = p t ( t n e r r u c e s l u p k a e pi p p 5 1a e r u t a r e p m e t g n i r e d l o s d a e lt l ) . c e s 0 1 ( 0 6 2c e r u t a r e p m e t g n i t a r e p ot j 5 2 1 + o t 5 5 -c e r u t a r e p m e t e g a r o t st g t s 0 5 1 + o t 5 5 -c 1 - 5 1 a d c l r e t e m a r a pl o b m y ss n o i t i d n o cm u m i n i ml a c i p y tm u m i x a ms t i n u e g a t l o v f f o - d n a t s e s r e v e rv m w r 5 1v e g a t l o v n w o d k a e r b e s r e v e rv r b i t a m 1 =7 . 6 1v t n e r r u c e g a k a e l e s r e v e ri r v m w r c 5 2 = t , v 5 1 =5a e g a t l o v d r a w r o f e d o i d g n i r e e t sv f i f a 1 =5 . 1v e g a t l o v g n i p m a l cv c i p p s 0 2 / 8 = p t , a 1 =4 2v e g a t l o v g n i p m a l cv c i p p s 0 2 / 8 = p t , a 5 1 =3 3v e c n a t i c a p a c n o i t c n u jc j d n a s n i p o / i n e e w t e b d n g v r z h m 1 = f , v 0 = 85 1f p
3 ? 2002 semtech corp. www.semtech.com protection products preliminary protection products LCDA15-1 typical characteristics non-repetitive peak pulse power vs. pulse time power derating curve 0 10 20 30 40 50 60 70 80 90 100 110 0 25 50 75 100 125 150 ambient temperature - t a ( o c) % of rated power or i pp clamping voltage vs. peak pulse current 0 10 20 30 40 50 60 70 80 90 100 110 0 5 10 15 20 25 30 time ( s) percent of i pp e -t td = i pp /2 waveform parameters: tr = 8 s td = 20 s pulse waveform variation of capacitance vs. reverse voltage 0.01 0.1 1 10 0.1 1 10 100 1000 pulse duration - tp ( s) peak pulse power - p pp (kw) diode forward voltage vs. forward current 0 5 10 15 20 25 30 35 0 5 10 15 20 25 peak pulse current - ipp (a) clamping voltage - vc (v) waveform parameters: tr = 8 s td = 20 s 7 7.5 8 8.5 9 0123456789101112 reverse voltage (v) capacitance (pf) f=1mhz 0 1 2 3 4 5 6 7 8 9 10 0 5 10 15 20 25 30 35 40 45 50 forward current - i f (a) forward voltage - v f (v) waveform parameters: tr = 8 s td = 20 s
4 ? 2002 semtech corp. www.semtech.com protection products protection products LCDA15-1 applications information device connection for protection of high-speed data lines the LCDA15-1 is designed to protect high-speed data lines from transient over-voltages which result from lightning and esd. the device is designed to protect one unidirectional line in common mode (line-to- ground). for common mode protection, the signal is input at pins 2 and 3. pins 1 & 4 are connected to ground. the ground connection should be made directly to the ground plane for best results. adsl protection figure 2 shows a typical adsl schematic diagram with the LCDA15-1 configured to provide lightning and esd protection for the sensitive adsl line driver. the LCDA15-1 is connected from each line to ground on the ic side of the line. the LCDA15-1 should to be grounded to the system ground to provide a proper reference. 1 2 3 4 line in line out figure 1 - connection for common mode protection (line-to-ground) figure 2 - adsl protection circuit LCDA15-1 +15 +15 LCDA15-1
5 ? 2002 semtech corp. www.semtech.com protection products preliminary protection products LCDA15-1 land pattern - sot-143 outline drawing - sot-143 notes: (1) controlling dimension: inch (unless otherwise specified). (2) dimension a and b do not include mold protrusions. mold protrusions are .006? max.
6 2002 semtech corp. www.semtech.com protection products protection products LCDA15-1 contact information semtech corporation protection products division 200 flynn road, camarillo, ca 93012 phone: (805)498-2111 fax (805)498-3804 ordering information r e b m u n t r a p g n i k r o w e g a t l o v r e p y t q l e e r e z i s l e e r c t . 1 - 5 1 a d c lv 5 10 0 0 , 3h c n i 7 marking codes r e b m u n t r a p g n i k r a m e d o c 1 - 5 1 a d c lu 5 1
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