protection products 1 www.semtech.com protection products sdc15 tvs diode array for esd protection of 12v data and power lines description features circuit diagram schematic & pin configuration revision 12/15/04 the sdc15 transient voltage suppressor (tvs) is designed to protect components which are connected to data and transmission lines from voltage surges caused by electrostatic discharge (esd) (esd) (esd) (esd) (esd), electrical fast transients (eft) (eft) (eft) (eft) (eft) , and lightning lightning lightning lightning 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-cathode design allows the user to protect one data or power line operating at 12 volts. the low profile sot23 package allows flexibility in the design of ?crowded? circuit boards. the sdc15 tvs 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 ? rs-232 data lines ? portable electronics ? industrial controls ? set-top box ? servers, notebook, and desktop pc ? 12v dc supply protection ? 300 watts peak pulse power (t p = 8/20s) ? 40 watts peak pulse power (t p = 10/1000s) ? transient protection for data and 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 (1.2/50s) ? protects one bidirectional line ? low clamping voltage ? low leakage current ? high surge capability ? solid-state silicon avalanche technology ? jedec sot23 package ? molding compound flammability rating: ul 94v-0 ? marking : dc15 ? packaging : tape and reel per eia 481 sot23 (top view)
2 ? 2004 semtech corp. www.semtech.com protection products protection products sdc15 absolute maximum rating electrical characteristics 5 1 c d 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 8 . 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 = 2 d n a 1 n i p n e e w t e b ) n o i t c e r i d h c a e ( 3 . 4 14 . 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 8 . 2 1 = 2 d n a 1 n i p n e e w t e b ) n o i t c e r i d h c a e ( 0 0 1a n e g a t l o v d r a w r o fv f i f , a m 0 0 1 = d n a 3 o t 1 n i p 3 o t 2 n i p 3 . 1v r b v f o t n e i c i f f e o c e r u t a r e p m e t r b v 2 1c / v m e g a t l o v g n i p m a l cv c i p p , a 9 . 1 = s 0 0 0 0 1 / 0 1 = p t 2 d n a 1 n i p n e e w t e b ) n o i t c e r i d h c a e ( 2 . 1 2v e c n a t i c a p a c n o i t c n u jc j v r z h m 1 = f , v 0 = 2 o t 1 n i p 0 2 1f 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 r r u c e s l u p k a e p) s 0 2 / 8 = p ti p p 0 1a ) s 0 0 1 = p t ( t n e r r u c d r a w r o f k a e p e v i t i t e p e r - n o ni x a m s f 4a 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
3 ? 2004 semtech corp. www.semtech.com protection products sdc15 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 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 = 8s td = 20s forward voltage vs. forward current 10 15 20 25 123456789101112 peak pulse current - i pp (a) clamping voltage - v c (v) waveform parameters: tr = 8s td = 20s 0 0.5 1 1.5 2 2.5 3 0123456789101112 forward current - i f (a) forward voltage - v f (v) waveform parameters: tr = 8s td = 20s 0.01 0.1 1 10 0.1 1 10 100 1000 pulse duration - t p (s) peak pulse power - p pk (kw)
4 ? 2004 semtech corp. www.semtech.com protection products protection products sdc15 device connection for protection of one data line the sdc15 is designed to protect one data or i/o line operating at 12 volts. connection options are as follows: z common mode protection: pin 1 is connected to the data line and pin 2 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. pin 3 is not connected. z differential protection: pin 1 is connected to one line and pin 2 is connected to the second line. pin 3 is not connected. 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: z place the sdc15 near the input terminals or connectors to restrict transient coupling. z minimize the path length between the sdc15 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. device schematic and pin configuration rs-232 transceiver protection example applications information
5 ? 2004 semtech corp. www.semtech.com protection products sdc15 outline drawing - sot23 land pattern - 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
6 ? 2004 semtech corp. www.semtech.com protection products protection products sdc15 ordering information r e b m u n t r a p d a e l h s i n i f r e p y t q l e e r e z i s l e e r c t . 5 1 c d sb p n s0 0 0 , 3h c n i 7 t c t . 5 1 c d se e r f b p0 0 0 , 3h c n i 7 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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