1 www.semtech.com protection products sm05 through sm36 tvs diode array description features circuit diagram schematic & pin configuration revision 07/12/04 the sm series of transient voltage suppressors (tvs) are designed to protect components which are connected to data and transmission lines from voltage surges caused by electrostatic discharge (esd) , electrical fast transients (eft) , and lightning . tvs diodes are characterized by their high surge capability, low operating and clamping voltages, and fast response time. this makes them ideal for use as board level protection of sensitive semiconductor components. the dual-junction common-anode design allows the user to protect one bidirectional data line or two unidirectional lines. the low profile sot23 package allows flexibility in the design of ?crowded? circuit boards. the sm series will meet the surge requirements of iec 61000-4-2 (formerly iec 801-2), level 4, ?human body model? for air and contact discharge. applications mechanical characteristics ? cellular handsets and accessories ? portable electronics ? industrial controls ? set-top box ? servers, notebook, and desktop pc ? 300 watts peak pulse power (t p = 8/20s) ? transient protection for data & power lines to iec 61000-4-2 (esd) 15kv (air), 8kv (contact) iec 61000-4-4 (eft) 40a (5/50ns) iec 61000-4-5 (lightning) 12a (8/20s) ? protects one bidirectional line or two unidirectional lines ? working voltages: 5v, 12v, 15v, 24 and 36v ? low clamping voltage ? solid-state silicon avalanche technology ? jedec sot23 package ? molding compound flammability rating: ul 94v-0 ? marking : marking code ? packaging : tape and reel per eia 481 sot23 (top view)
2 ? 2004 semtech corp. www.semtech.com protection products sm05 through sm36 absolute maximum rating electrical characteristics 5 0 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 , a 1 = t p s 0 2 / 8 = 8 . 9v t n e r r u c e s l u p k a e pi p p t p s 0 2 / 8 =7 1a e c n a t i c a p a c n o i t c n u jc j 2 o t 1 n i p v r z h m 1 = f , v 0 = 0 5 3f p e c n a t i c a p a c n o i t c n u jc j d n a 3 o t 1 n i p 3 o t 2 n i p v r z h m 1 = f , v 0 = 0 0 4f p 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 3s t t a w t n e i b m a o t n o i t c n u j , e c n a t s i s e r l a m r e h t a j 6 5 5w / c 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 2 1 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 , a 1 = t p s 0 2 / 8 = 9 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 =2 1a e c n a t i c a p a c n o i t c n u jc j 2 o t 1 n i p v r z h m 1 = f , v 0 = 0 2 1f p e c n a t i c a p a c n o i t c n u jc j d n a 3 o t 1 n i p 3 o t 2 n i p v r z h m 1 = f , v 0 = 0 5 1f p
3 ? 2004 semtech corp. www.semtech.com protection products protection products sm05 through sm36 electrical characteristics (continued) 5 1 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 1 = p s 0 2 / 8 =4 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 =0 1a e c n a t i c a p a c n o i t c n u jc j 2 o t 1 n i p v r z h m 1 = f , v 0 = 5 7f p e c n a t i c a p a c n o i t c n u jc j 3 o t 2 d n a 3 o t 1 n i p v r z h m 1 = f , v 0 = 0 0 1f p 4 2 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 1 = p s 0 2 / 8 =3 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 =5a e c n a t i c a p a c n o i t c n u jc j 2 o t 1 n i p v r z h m 1 = f , v 0 = 0 5f p e c n a t i c a p a c n o i t c n u jc j 3 o t 2 d n a 3 o t 1 n i p v r z h m 1 = f , v 0 = 0 6f p 6 3 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 6 3v 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 =0 4v 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 6 3 =1a e g a t l o v g n i p m a l cv c i p p t , a 1 = p s 0 2 / 8 =0 6v t n e r r u c e s l u p k a e pi p p t p s 0 2 / 8 =4a e c n a t i c a p a c n o i t c n u jc j 2 o t 1 n i p v r z h m 1 = f , v 0 = 0 4f p e c n a t i c a p a c n o i t c n u jc j 3 o t 2 d n a 3 o t 1 n i p v r z h m 1 = f , v 0 = 5 4f p
4 ? 2004 semtech corp. www.semtech.com protection products sm05 through sm36 typical characteristics non-repetitive peak pulse power vs. pulse time 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 power derating curve pulse waveform 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 l e v e lt s r i f k a e p t n e r r u c ) a ( k a e p t n e r r u c s n 0 3 t a ) a ( k a e p t n e r r u c s n 0 6 t a ) a ( t s e t e g a t l o v t c a t n o c ( ) e g r a h c s i d ) v k ( t s e t e g a t l o v r i a ( ) e g r a h c s i d ) v k ( 15 . 748 2 2 25 184 4 4 35 . 2 22 166 8 40 36 18 8 5 1 0.01 0.1 1 10 0.1 1 10 100 1000 pulse duration - t p (s) peak pulse power - p pk (kw) iec 61000-4-2 discharge parameters esd pulse waveform (per iec 61000-4-2)
5 ? 2004 semtech corp. www.semtech.com protection products protection products sm05 through sm36 applications information device schematic & pin configuration device connection options the sm series is designed to protect one bidirectional or two unidirectional data or i/o lines operating at 5 to 36 volts. connection options are as follows: z z z z z bidirectional: pin 1 is connected to the data line and pin 2 is connected to ground (since the device is symmetrical, these connections may be re- versed). the ground connection should be made directly to a ground plane. the path length should be kept as short as possible to minimize parasitic inductance. pin 3 is not connected. z z z z z unidirectional: data lines are connected to pin 1 and pin 2. pin 3 is connected to ground. for best results, this pin should be connected directly to a ground plane on the board. the path length should be kept as short as possible to minimize parasitic inductance. circuit board layout recommendations for suppres- sion of esd. good circuit board layout is critical for the suppression of fast rise-time transients such as esd. the following guidelines are recommended (refer to application note si99-01 for more detailed information): z place the tvs near the input terminals or connec- tors to restrict transient coupling. z minimize the path length between the tvs 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. matte tin lead finish matte tin has become the industry standard lead-free replacement for snpb lead finishes. a matte tin finish is composed of 100% tin solder with large grains. since the solder volume on the leads is small com- pared to the solder paste volume that is placed on the land pattern of the pcb, the reflow profile will be determined by the requirements of the solder paste. therefore, these devices are compatible with both lead-free and snpb assembly techniques. in addition, unlike other lead-free compositions, matte tin does not have any added alloys that can cause degradation of the solder joint. rs-232 transceiver protection example
6 ? 2004 semtech corp. www.semtech.com protection products sm05 through sm36 land pattern - sot23 outline drawing - sot23 e e1 d e1 e bxn 12 3 a1 a2 a 3x a bbb c a b b c seating plane aaa c 1.40 1.20 n3 3 0 - 8 0 8 0 - .055 .047 bbb .008 0.20 aaa .004 0.10 inches .114 l1 e d b e c .012 .003 .082 a1 dim a min .000 .035 0.51 0.18 2.64 0.30 0.08 2.10 .022 - .075 - .093 .020 .007 .104 (0.55) 1.90 bsc - - 2.37 2.90 millimeters max 0.10 1.12 min dimensions 0.01 max nom - - .004 .044 nom 0.89 - - 3.04 2.80 .110 .120 e1 .037 0.95 bsc l .015 .020 0.50 0.40 .024 0.60 a2 .035 .037 0.95 0.88 .040 1.02 e1 .051 1.30 see detail a side view datums and to be determined at datum plane -a- -b- 2. controlling dimensions are in millimeters (angles in degrees). notes: or gate burrs. dimensions "e1" and "d" do not include mold flash, protrusions 3. 1. -h- h detail a 0.25 c seating plane gauge plane 0 c l l1 reference ipc-sm-782a. 2. e .037 0.95 y y g z c e x e1 e1 .075 1.90 notes: 1. this land pattern is for reference purposes only consult your manufacturing group to ensure your company's manufacturing guidelines are met. dim y z g x c millimeters inches (2.20) .055 .141 .039 .031 (.087) 1.40 3.60 1.00 0.80 dimensions
7 ? 2004 semtech corp. www.semtech.com protection products protection products sm05 through sm36 ordering information r e b m u n t r a ph s i n i f d a e l r e p y t q l e e r e z i s l e e r c t . 5 0 m sb p n s0 0 0 , 3h c n i 7 c t . 2 1 m sb p n s0 0 0 , 3h c n i 7 c t . 5 1 m sb p n s0 0 0 , 3h c n i 7 c t . 4 2 m sb p n s0 0 0 , 3h c n i 7 c t . 6 3 m sb p n s0 0 0 , 3h c n i 7 t c t . 5 0 m se e r f b p0 0 0 , 3h c n i 7 t c t . 2 1 m se e r f b p0 0 0 , 3h c n i 7 t c t . 5 1 m se e r f b p0 0 0 , 3h c n i 7 t c t . 4 2 m se e r f b p0 0 0 , 3h c n i 7 t c t . 6 3 m se e r f b p0 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 5 0 m s5 0 m 2 1 m s2 1 m 5 1 m s5 1 m 4 2 m s4 2 m 6 3 m s6 3 m h c n a r b n a w i a t 0 8 3 3 - 8 4 7 2 - 2 - 6 8 8 : l e t fx a0 9 3 3 - 8 4 7 2 - 2 - 6 8 8 : h b m g d n a l r e z t i w s h c e t m e s h c n a r b n a p a j 0 5 9 0 - 8 0 4 6 - 3 - 1 8 : l e t 1 5 9 0 - 8 0 4 6 - 3 - 1 8 : x a f h c n a r b a e r o k tl e7 7 3 4 - 7 2 5 - 2 - 2 8 : f6 7 3 4 - 7 2 5 - 2 - 2 8 : x a ) . k . u ( d e t i m i l h c e t m e s 0 0 6 - 7 2 5 - 4 9 7 1 - 4 4 : l e t 1 0 6 - 7 2 5 - 4 9 7 1 - 4 4 : x a f e c i f f o i a h g n a h s t0 3 8 0 - 1 9 3 6 - 1 2 - 6 8 : l e 1 3 8 0 - 1 9 3 6 - 1 2 - 6 8 : x a f l r a s e c n a r f h c e t m e s 0 0 - 2 2 - 8 2 - 9 6 1 ) 0 ( - 3 3 : l e t 8 9 - 2 1 - 8 2 - 9 6 1 ) 0 ( - 3 3 : x a f f o y r a i d i s b u s d e n w o - y l l o h w a s i g a l a n o i t a n r e t n i h c e t m e s . a . s . u e h t n i s r e t r a u q d a e h s t i s a h h c i h w , n o i t a r o p r o c h c e t m e s h b m g y n a m r e g h c e t m e s 3 2 1 - 0 4 1 - 1 6 1 8 ) 0 ( - 9 4 : l e t 4 2 1 - 0 4 1 - 1 6 1 8 ) 0 ( - 9 4 : x a f contact information for semtech international ag
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