low voltage uni directio nal tvsarra y ? scottsd a l e division slvu2.8k ? 4u w w w . mi c r o s e m i . c o m slvu2.8k ? 4u descripti on appeara n c e t he slvu2.8k -4u provides 500 watt pr otection w i t h low capacit ance, low clamping volt a g e and the lo west l eakage in the ind u str y for tw o lin es to grou nd (comm on mod e ). lo w u n i d irecti on a l capac itanc e o f 10 pf for each lin e an d lo w standb y curr en t provides a m o re stabl e sig n a l in h i gh er freque nc y ap plic a t ions an d at lo w e r oper atin g voltag es of 2. 8 volts. negati v e transie nts on each l i n e are also clam ped to ver y l o w volt ages w i t h an a n ti-par all e l for w ard di ode i n ea ch leg (l ine to g r oun d). t he slvu2.8k- 4 u i s desig ne d for use in a p p licat i ons w h ere prot ection is re quir ed at the boar d leve l from voltage tran sients caus ed b y electrostatic dischar ge (es d ) as defin ed i n iec 6100 0-4- 2, electrica l fast transi ent s (ef t ) per iec 6100 0-4-4 a nd effec t s of secon dar y li ght nin g . t hese arra y s are use d to protect t w o li nes b y con nect i ng b o th pi ns 1 and 8 to li ne 1 and p i ns 4 a n d 5 to line 2. pins 2 and 7 as w e ll as pins 3 and 6 ar e al l conn ected to g r oun d as sho w n in f i gur es 3, 4 and 5. import a n t : f o r the most cur r e n t data, consult mi c r os e m i ? s w e bsite: http:// www .microsemi.com features a p p l i c at ions / be ne fi ts ? protects 2 uni d i rectio nal l i nes to groun d w i th ver y l o w clampi ng vo lta ge inc l ud in g op posite (n eg ativ e) transie nts on e a ch li ne w i th a for w a r d b i ase d diod e ? provid es electr icall y - i sol a ted protectio n ? lo w o perati ng voltag e: 2.8 vol t s ? lo w ca pacit an ce of 10 pf ? lo w stan db y c u rrent ? lo w cl ampi ng voltag e w i th mi nimal v o ltag e o v ersho o t ? eia-rs232 d a t a rate: 19.6 kb s ? eia-rs422 d a t a rate: 10 mbs ? eia-rs423 d a t a rate: 100 kbs ? 10 / 100 ether net ? w a n / lan equipm ent ? lo w e st standb y (le a ka ge) cur r ent in the in du str y ? ver y l o w p a ras i tic ind u ctance resulti ng in mi n i mal voltag e overs h oot (ldi/dt) effe cts ? neg a tive transi ents minimiz e d that could d a m age cmos transceivers max i mu m rat ing s mechan ic al an d pa ckagin g ? operatin g t e mperatur e: -55 c to + 150c ? storage t e mperature: -55 c to + 150c ? peak puls e po w e r: 500 w a tts (8/20 s, f i gure 1 a nd f i g u re 2) ? molded so-8 surface mount ? ul 94v- 0 f l am mabil i t y c l assif i catio n ? w e ight 0.06 6 g r ams (appr o x i m ate) ? marking: l ogo, device mark in g code, d a te code ? pin #1 d e fin ed b y dot on top o f package ? t ape & reel p e r eia standar d 481- 1-a ? 13 inch re el; 2 , 500 pi eces (s t a ndard) ? carrier tu bes; 95 pcs (opt ional) electrical ch aracteristics per line @ 25c unless otherwise specified st andoff volt age v wm volt s punch-t hru volt age v pt i pt = 2 a volt s snap-b a ck volt age v sb i sb = 50 ma volt s st andb y current i d v wm = 2.8v a cla m pi ng volt age v c i pp = 2 a (figure 2 ) volt s cla m pi ng volt age v c i pp = 5 a (figure 2 ) volt s cla m pi ng volt age v c i pp = 24 a (figure 2 ) volt s capacit ance (f=1 m h z) * c @ 0v pf part nu m ber device m a rkin g code ma x mi n mi n ma x m a x ma x m a x t y p s l v u 2 . 8 k - 4 u 2 . 8 k 4 u 2 . 8 3 . 0 2 . 8 0 . 1 5 . 5 8 . 5 1 5 1 0 * cap a citanc e l i ne-to- g rou nd i s 10 pf t y pic a l (inclu di ng a n ti- para lle l dio de f o r neg ative tra n sie n ts and l o w cl ampi ng vo l t age). note: t r ansien t voltage su pp ressor (t vs) p r oduct is norm a ll y sel e cted b a sed o n its stand off voltag e v wm . product selecte d voltag e sho u ld be eq ua l to or greater tha n th e contin uo us p eak op erati ng voltag e of the circuit to be prot ected. m i cro semi scottsdale division 8700 e. thom as rd. po bo x 139 0, scottsdale, az 85252 usa, ( 4 8 0 ) 941- 6300, fax: (480) 947-1 503 page 1 cop y right ? 200 3 mscxxxx.pdf 10-6-2 003 rev 0
low voltage uni directio nal tvsarra y ? scottsd a l e division slvu2.8k ? 4u w w w . mi c r o s e m i . c o m slvu2.8k ? 4u sy mbol s & defin i ti ons symbol defi nition v wm standoff volta ge: maximum dc volt ag e that can be a p p lie d over t he op erat ing temp eratur e rang e. v wm must be selecte d to be e qua l or be gr ea ter than t he op eratin g volta g e of t he line to b e protected. v pt punch-t h ru vo ltage: t he mini mum voltag e t he dev ice w i ll e x h i bit at a sp ec ified curr ent v sb snap-b a ck vol t age: t he minimum snap- bac k voltage th e d e vice w i ll e x hib i t at a specifie d current v c clamp in g volta ge: ma ximum c l ampi ng vo ltag e across the t vs device w h e n subj ected to a give n current at a puls e time of 20 s. i d standb y c u rre nt: current at v wm . c cap a citanc e: cap a citanc e of the t vs as defined @ 0 vo lts at a frequenc y of 1 mhz and stated in pic o fa rads. graphs 8/20 s 50 0w p u lse p pp ? pe ak pulse power (w ) pulse time t= sec fig u re 2 figure 1 pulse wav e form peak pulse po w e r v s . pulse time m i cro semi scottsdale division 8700 e. thom as rd. po bo x 139 0, scottsdale, az 85252 usa, ( 4 8 0 ) 941- 6300, fax: (480) 947-1 503 page 2 cop y right ? 200 3 mscxxxx.pdf 10-6-2 003 rev 0
low voltage uni directio nal tvsarra y ? m i cro semi scottsdale division 8700 e. thom as rd. po bo x 139 0, scottsdale, az 85252 usa, ( 4 8 0 ) 941- 6300, fax: (480) 947-1 503 page 3 cop y right ? 200 3 mscxxxx.pdf 10-6-2 003 rev 0 w w w . mi c r o s e m i . c o m scottsd a l e division slvu2.8k ? 4u slvu2.8k ? 4u sch e ma ti c figure 4 figure 3 circuit boar d la y out common mo de con f igur ation figure 5 schematic package dimensions and pad layout pad l a yo u t i n c h e s m i l l i m e t e r s d i m m i n m a x m i n m a x a 0 . 1 8 8 0 . 1 9 7 4 . 7 7 5 . 0 0 b 0 . 1 5 0 0 . 1 5 8 3 . 8 1 4 . 0 1 c . 0 5 3 . 0 6 9 1 . 3 5 1 . 7 5 d . 0 1 1 . 0 2 1 0 . 2 8 0 . 5 3 f . 0 1 6 . 0 5 0 0 . 4 1 1 . 2 7 g .050 bsc 1.27 bsc j . 0 0 6 . 0 1 0 0 . 1 5 0 . 2 5 k . 0 0 4 . 0 0 8 0 . 1 0 0 . 2 0 l . 1 8 9 . 2 0 6 4 . 8 0 5 . 2 3 p . 2 2 8 . 2 4 4 5 . 7 9 6 . 1 9 + + outli ne
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