preliminary 1 www.semtech.com protection products tc03a-200 battery tracking transclamp ? ? ? ? ? for slic linecard protection preliminary description features circuit diagram schematic & pin configuration revision 9/2000 the battery tracking transclamp series of transient voltage suppressors (tvs) are designed to protect subscriber line interface circuits (slic) from transient voltages resulting from lightning strikes and ac power line disturbances. the tc03a-200 integrates all the components necessary to protect slic ics from line to ground for positive and negative transients. for negative transient events, the tvs thyristor will crowbar or ?fire? when the line voltage exceeds the gate reference voltage. the gate voltage is referenced to the battery voltage ( -v bat ) plus the v f of the series rectifier. the device firing voltage range is -5v to -100v. external diodes are used to shunt positive transients to ground. these devices are designed to meet industry standard transient immunity requirements such as bellcore tr- nwt-001089, fcc part 68, itu k17-k20, and iec 61000-4-5. the high surge capability is advantageous in harsh environments, and offers better reliability than "low surge" rated devices. the integrated design saves board space and increases equipment reliability by replacing multiple discrete components. the device may be used to protect any slic and is particularly suited for those with integrated ring generators. applications mechanical characteristics ! subscriber line interface circuit (slic) protection ! central office equipment ! isdn terminal adaptors ! cable telephony ! small office home office (soho) applications ! wireless local loop (wll) ! transient protection for telecommunications lines to bellcore 1089 (long haul), vde 0433, itu k20 iec 61000-4-5 (lightning), and fcc part 68 ! high surge current rating (100a, tp = 10/1000s) ! protects up to two tip & ring line pairs ! gate firing voltage is referenced to the system battery voltage ! wide firing voltage range: -5v to -100v ! high holding current: 200ma ! replaces discrete components ! solid-state tvs process technology ! jedec sot-89 package ! molding compound flammability rating: ul 94v-0 ! marking : part number, date code, logo ! packaging : tape and reel per eia 481 sot-89 (top view) gnd -vbat line 2 3 1 123 line gnd gate
2 ? 2000 semtech corp. www.semtech.com preliminary protection products TCO3A-200 preliminary absolute maximum rating electrical characteristics g n i t a rg n i t a r g n i t a r g n i t a rg n i t a rl o b m y sl o b m y s l o b m y s l o b m y sl o b m y se u l a ve u l a v e u l a v e u l a ve u l a vs t i n us t i n u s t i n u s t i n us t i n u / 0 1 = p t ( t n e r r u c e s l u p k a e p 0 0 0 1 ) si p p 0 0 1a p t ( t n e r r u c e s l u p k a e p 0 1 / 2 = ) si p p 0 0 5a e v a w e n i s z h 0 6 s u o u n i t n o ci m s t 0 6a 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 ) s d n o c e s 0 1 ( 0 6 2 o c 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 - o 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 - o c 0 0 2 - a 3 0 c t 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 r d c 5 2 = t0 0 1 -v e g a t l o v g n i h c t i w sv s i = i s v - t t a b v 5 -v e g a t l o v g n i p m a l c e s r e v e rv c i p p s 0 0 0 1 / 0 1 = p t , a 1 =2v i p p , a 0 3 = s 0 0 0 1 / 0 1 = p t 3v i p p , a 0 0 1 = s 0 0 0 1 / 0 1 = p t 2 1v e g a t l o v e t a t s - n ov t i t a 1 =3v t n e r r u c e g a k a e l e s r e v e ri m r d v m r d c 5 2 = t , v 0 0 1 - =5a t n e r r u c g n i h c t i w s ) t n e r r u c g n i r e g g i r t e t a g ( i s c 5 2 = t0 6a m t n e r r u c g n i d l o hi h c 5 2 = t0 0 2 -0 2 2 -a m t n e r r u c e t a t s - n o s u o u n i t n o ci t c 5 2 = t1a e c n a t i c a p a c e t a t s - f f oc f f o d n g & s n i p o / i n e e w t e b v r z h m 1 = f , v 0 = 0 0 1f p d n g & s n i p o / i n e e w t e b v r z h m 1 = f , v 0 5 - = 0 5f p
3 ? 2000 semtech corp. www.semtech.com preliminary protection products TCO3A-200 preliminary typical characteristics impulse 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 normalized holding current vs. temperature reverse leakage current vs. temperature normalized gate trigger current vs. temperature diode forward voltage vs. forward current impulse response characteristic 0 0.2 0.4 0.6 0.8 1 1.2 1.4 0 255075100125150 junction temperature - tj ( o c) normalised holding curren t ih (t j )/ih (25 o c) 0.1 1 10 100 1000 0 25 50 75 100 125 150 temperature ( o c) reverse leakage current - i drm (ua) v drm =-100v 0 0.2 0.4 0.6 0.8 1 1.2 0 20 40 60 80 100 120 140 temperature ( o c) normalised gate trigger curren 0 1 2 3 4 5 6 0 20406080100120140160 forward current - i f (a) forward voltage - v f (v) 1.2x50usec 920v@50a with 0.1ufd -95 -85 -75 -65 -55 -45 -35 -25 -15 -5 2.5 3.5 4.5 5.5 6.5 7.5 8.5 9.5 10.5 11.5 12.5 time in usec volts -50v bias -60v bias -70v bias -80v bias -90v bias
4 ? 2000 semtech corp. www.semtech.com preliminary protection products TCO3A-200 preliminary slic operating voltages (unbalanced ringing) balanced ringing slic protection concepts slic protection concepts slic protection concepts slic protection concepts slic protection concepts transient immunity standards require telecommunica- tions equipment be surged in all of its operating states. this refers to the ?on-hook? state (ring generator or ring detection monitoring) and the ?off-hook? state (operational state). the on-hook state must allow for operation of the normal battery voltage and ring voltage without interference. the off-hook state only allows for operation of the battery voltage plus opera- tion signals. several slic types exist. the first type of slic requires an external ring relay to disconnect the slic and connect the ringing and trip bias power supply generat- ing the ringing signal. protection must be provided for the subsystem which includes the ringing relay and ringing source. this type of ringing is sometimes called unbalanced ringing. the ringing voltage is typically inserted on the ring (b-lead), while the tip (a-lead) is grounded. the slic may or may not be protected by the ringing subsystem protection. separate subsystem protection may be needed and must have a minimum operating voltage that exceeds the battery voltage and the ring signal voltage. the slic ic is disconnected from the line and the ring generator and does not see the ringing voltages. therefore, the protection element for the slic must only have a minimum operating voltage greater than the battery supply voltage. this device must suppress all transients above ground and below the battery voltage. the second slic type has an integrated ring generation capability. the protection device described in this application information is particularly suited for use with this slic type. unlike the unbalanced system described above, these slic devices generate a balanced ring signal between tip & ring. the voltage on either line falls between the battery voltage and ground. therefore, the slic protection device can have an operating voltage that is very close to the battery voltage. since battery voltages may vary between talk and ringing states, it is desirable to utilize a program- mable protection device so that the voltage across the slic does not exceed the process limits and the stress on the device is minimized. tip ring battery 0v applications information
5 ? 2000 semtech corp. www.semtech.com preliminary protection products TCO3A-200 preliminary applications information (continued) protecting one slic line pair protecting one slic line pair protecting one slic line pair protecting one slic line pair protecting one slic line pair the tc03a-200 battery tracking transclamp is specifi- cally designed to protect subscriber line interface circuits (slics). the protection voltage of the device is referenced to the system?s dc battery voltage. there- fore, the protection voltage will be essentially the same as the slic supply voltage, minimizing the stress on the protected device. the tc03a-200 may be refer- enced to battery voltages ranging from -5v to -100v. pin 1 is connected to the line (a-lead or b-lead). the battery feed voltage source is connected to the gate of the internal scr at pin 3. pin 2 is connected to ground. a 0.1f capacitor is recommended between the gate & ground to speed up the triggering of the device. protecting slic with integrated ring generator protecting slic with integrated ring generator protecting slic with integrated ring generator protecting slic with integrated ring generator protecting slic with integrated ring generator tc03 connection diagram tc03 connection diagram tc03 connection diagram tc03 connection diagram tc03 connection diagram tc03a-200 tc03a-200 123 line gnd gate protecting multiple slic lines protecting multiple slic lines protecting multiple slic lines protecting multiple slic lines protecting multiple slic lines the tc03a-200 may be used in conjunction with steering diodes to protect up to two slic tip & ring line pairs. the steering diodes shunt positive surges to ground. in this configuration, each line pair may be surged to 100a (tp=10/100s) independantly, or all four pairs may be surged simultaneously up to 50a (tp=10/100s). this provides the designer with a flexible, cost effective solution and increased reliability over low current protection schemes. typical applications
6 ? 2000 semtech corp. www.semtech.com preliminary protection products TCO3A-200 preliminary typical applications (continued) protecting slic with external ring generator protecting multiple slic?s with external ring generators
7 ? 2000 semtech corp. www.semtech.com preliminary protection products TCO3A-200 preliminary land pattern - sot-89 outline drawing - sot-89
8 ? 2000 semtech corp. www.semtech.com preliminary protection products TCO3A-200 preliminary contact information semtech corporation protection products division 652 mitchell rd., newbury park, ca 91320 phone: (805)498-2111 fax (805)498-3804 ordering information r e b m u n t r a p g n i d l o h t n e r r u c l e e r r e p y t qe z i s l e e r c t . 0 0 2 - a 3 0 c ta m 0 0 20 0 0 3h c n i 7
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