1 www.semtech.com protection products sms05 through sms24 tvs diode array for esd and latch-up protection ? transient protection for data lines to iec 61000-4-2 (esd) 15kv (air), 8kv (contact) iec 61000-4-4 (eft) 40a (5/50ns) iec 61000-4-5 (lightning) 24a (8/20s) ? small package for use in portable electronics ? protects four i/o lines ? working voltages: 5v, 12v, 15v and 24v ? low leakage current ? low operating and clamping voltages ? solid-state silicon avalanche technology description features circuit diagram schematic & pin configuration revision 01/31/03 applications mechanical characteristics the sms series of tvs arrays are designed to protect sensitive electronics from damage or latch-up due to esd and other voltage-induced transient events. each device will protect up to four lines. they are available with operating voltages of 5v, 12v, 15v and 24v. they are unidirectional devices and may be used on lines where the signal polarities are above ground. tvs diodes are solid-state devices designed specifically for transient suppression. they feature large cross- sectional area junctions for conducting high transient currents. they offer desirable characteristics for board level protection including fast response time, low operating and clamping voltage and no device degrada- tion. the sms series devices may be used to meet the immunity requirements of iec 61000-4-2, level 4. the low cost sot23-6l package makes them ideal for use in portable electronics such as cell phones, pda?s, and notebook computers. sot23-6l (top view) ? eiaj sot23-6l package ? molding compound flammability rating: ul 94v-0 ? marking : marking code ? packaging : tape and reel per eia 481 ? cell phone handsets and accessories ? microprocessor based equipment ? personal digital assistants (pda?s) and pagers ? desktops pc and servers ? notebook, laptop, and palmtop computers ? portable instrumentation ? peripherals ? mp3 players ? cordless phones
2 ? 2003 semtech corp. www.semtech.com protection products protection products sms05 through sms24 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 5 3s t t a w ) 2 - 4 - 0 0 0 1 6 c e i r e p m b h ( e g a t l o v d s ev d s e 5 2 >v k 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 5 0 s m s 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 5v 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 =6 v 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 =0 2a e g a t l o v g n i p m a l cv c i p p t , a 5 = p s 0 2 / 8 =8 . 9v e g a t l o v g n i p m a l cv c i p p t , a 4 2 = p s 0 2 / 8 =5 . 4 1v t n e r r u c e s l u p k a e pi p p t p s 0 2 / 8 =4 2a 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 u o r g v r z h m 1 = f , v 0 = 5 2 30 0 4f p 2 1 s m s 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 2 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 =3 . 3 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 2 1 =1a e g a t l o v g n i p m a l cv c i p p t , a 5 = p s 0 2 / 8 =9 1v e g a t l o v g n i p m a l cv c i p p t , a 5 1 = p s 0 2 / 8 =3 2v t n e r r u c e s l u p k a e pi p p t p s 0 2 / 8 =5 1a 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 u o r g v r z h m 1 = f , v 0 = 5 3 10 5 1f p
3 ? 2003 semtech corp. www.semtech.com protection products protection products sms05 through sms24 5 1 s m s 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 =1a e g a t l o v g n i p m a l cv c i p p t , a 5 = p s 0 2 / 8 =4 2v e g a t l o v g n i p m a l cv c i p p t , a 2 1 = p s 0 2 / 8 =9 2v t n e r r u c e s l u p k a e pi p p t p s 0 2 / 8 =2 1a 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 u o r g v r z h m 1 = f , v 0 = 0 0 15 2 1f p electrical characteristics (continued) 4 2 s m s 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 4 2v 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 2v 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 4 2 =1a e g a t l o v g n i p m a l cv c i p p t , a 5 = p s 0 2 / 8 =0 4v e g a t l o v g n i p m a l cv c i p p t , a 8 = p s 0 2 / 8 =4 4v t n e r r u c e s l u p k a e pi p p t p s 0 2 / 8 =8a 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 u o r g v r z h m 1 = f , v 0 = 0 65 7f p
4 ? 2003 semtech corp. www.semtech.com protection products protection products sms05 through sms24 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 5 10 15 20 25 30 time (s) percent of i pp e -t td = i pp /2 waveform parameters: tr = 8s td = 20s pulse waveform forward voltage vs. forward current 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 0.5 1 1.5 2 2.5 3 3.5 4 4.5 5 0 5 10 15 20 25 30 35 40 45 forward current - i f (a) forward voltage - v f (v) waveform parameters: tr = 8s td = 20s 0 5 10 15 20 25 30 35 40 45 0 5 10 15 20 25 30 peak pulse current - i pp (a) clamping voltage - v c (v) sms12 sms05 waveform parameters: tr = 8s td = 20s sms15 sms24 0.01 0.1 1 10 0.1 1 10 100 1000 pulse duration - t p (s) peak pulse power - p pk (kw)
5 ? 2003 semtech corp. www.semtech.com protection products protection products sms05 through sms24 smsxx circuit diagram protection of four unidirectional lines device connection for protection of four data lines the smsxx is designed to protect up to four unidirec- tional data lines. the device is connected as follows: 1. unidirectional protection of four i/o lines is achieved by connecting pins 1, 3, 4 and 6 to the data lines. pin 2 and 5 are connected to ground. the ground connections should be made directly to the ground plane for best results. the path length is kept as short as possible to reduce the effects of parasitic inductance in the board traces. circuit board layout recommendations for suppres- sion of esd good circuit board layout is critical for the suppression of esd induced transients. the following guidelines are recommended: z place the smsxx near the input terminals or con- nectors to restrict transient coupling. z minimize the path length between the smsxx and the protected line. z minimize all conductive loops including power and ground loops. z the esd transient return path to ground should be kept as short as possible. z never run critical signals near board edges. z use ground planes whenever possible. applications information
6 ? 2003 semtech corp. www.semtech.com protection products protection products sms05 through sms24 outline drawing - so-8 land pattern outline drawing
7 ? 2003 semtech corp. www.semtech.com protection products protection products sms05 through sms24 contact information semtech corporation protection products division 200 flynn road, camarillo, ca 93012 phone: (805)498-2111 fax (805)498-3804 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 . 5 0 s m sv 50 0 0 , 3h c n i 7 g t . 5 0 s m sv 50 0 0 , 0 1h c n i 3 1 c t . 2 1 s m sv 2 10 0 0 , 3h c n i 7 g t . 2 1 s m sv 2 10 0 0 , 0 1h c n i 3 1 c t . 5 1 s m sv 5 10 0 0 , 3h c n i 7 g t . 5 1 s m sv 5 10 0 0 , 0 1h c n i 3 1 c t . 4 2 s m sv 4 20 0 0 , 3h c n i 7 g t . 4 2 s m sv 4 20 0 0 , 0 1h c n i 3 1 note: (1) no suffix indicates tube pack. marking codes ordering information r e b m u n t r a p g n i k r a m e d o c 5 0 s m s5 0 / 5 0 2 1 s m s2 1 / 2 1 5 1 s m s5 1 / 5 1 4 2 s m s4 2 / 4 2
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