protection products 1 www.semtech.com protection products - microclamp ? ? ? ? ? UCLAMP3312T low voltage clamp ? ? ? ? ? for gigabit ethernet description features typical application schematic & pin configuration revision 4/25/2010 applications mechanical characteristics ? slp2010n8t package ? pb-free, halogen free, rohs/weee compliant ? nominal dimensions: 2.0 x 1.0 x 0.4 mm ? lead finish: nipdau ? molding compound flammability rating: ul 94v-0 ? marking: marking code ? packaging: tape and reel slp2010n8t gbe integrated magnetics module ? high esd withstand voltage: +/-30kv (contact/air) per iec 61000-4-2 ? able to withstand over 1000 esd strikes per iec 61000-4-2 level 4 ? flow-through design simplifies layout ? protects two line pairs ? low reverse current: 10na typical (vr=3.3v) ? low variation in capacitance vs. bias voltage: 1.3pf typical (vr = 0 to 3.3v) ? working voltage: 3.3v ? solid-state silicon-avalanche technology 1 2 ? 10/100/1000 ethernet ? integrated magnetics/rj-45 connectors ? lan/wan equipment ? security cameras ? industrial controls ? notebooks & desktop computers the clamp ? 3312t tvs diode is specifically designed to meet the performance requirements of gigabit ethernet interfaces. they are designed to protect sensitive phy chips from damage or upset due to electrostatic discharge (esd), lightning, electrical fast transients (eft), and cable discharge events (cde). the clamp3312t is constructed using semtech?s low voltage epd process technology. the epd process provides low operating voltages with significant reduc- tions in leakage current and capacitance over silicon- avalanche diode processes. the device features low variation in capacitance over bias for stable operation on gbe lines. this means the clamp3312t will introduce zero traffic frame errors on gbe interfaces up to a phy temperature of 120 o c (100m cat 5/5e cable). the clamp3312t also features high surge capability and is designed to be placed between the magnetics and the phy chip. in this configuration, the device can withstand intra-building lightning surges per telcordia gr-1089. the clamp3312t is in a 8-pin slp2010n8t package. it measures 2.0 x 1.0 x 0.4mm. the leads are spaced at a pitch of 0.5mm and are finished with lead-free nipdau. each device will protect two line pairs operat- ing at 3.3 volts. it gives the designer the flexibility to protect multiple lines in applications where space is at a premium. the small size and easy layout of the UCLAMP3312T make it ideal for use in rj-45 connec- tors with integrated magnetics. 1 2 3 4 5 6 7 8 rj-45 connector tp2+ tp2- tp3+ tp3- tp4+ tp4- tp1+ tp1- 1 2 3 4 5 6 7 8 rj-45 connector tp2+ tp2- tp3+ tp3- tp4+ tp4- tp1+ tp1- 1 2 3 4 5 6 7 8 rj-45 connector tp2+ tp2- tp3+ tp3- tp4+ tp4- tp1+ tp1-
2 ? 2010 semtech corp. www.semtech.com protection products UCLAMP3312T absolute maximum rating electrical characteristics (t=25 o c) 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 1s t t a w ( t n e r r u c e s l u p k a e p m u m i x a m) s 0 2 / 8 = p ti p p 0 1s p m a ) r i a ( 2 - 4 - 0 0 0 1 6 c e i r e p d s e ) t c a t n o c ( 2 - 4 - 0 0 0 1 6 c e i r e p d s e v d s e 0 3 - / + 0 3 - / + v k e r u t a r e p m e t g n i t a r e p ot j 5 8 + o t 0 4 -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 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 3 . 3v e g a t l o v h g u o r h t - h c n u pv t p i t p a 2 =5 . 38 . 33 . 4v e g a t l o v k c a b - p a n sv b s i b s a m 0 5 =8 . 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 v 3 . 3 =1 0 . 05 0 . 0a e g a t l o v g n i p m a l cv c i p p s 0 2 / 8 = p t , a 1 =6 . 5v e g a t l o v g n i p m a l cv c i p p s 0 2 / 8 = p t , a 0 1 =1 1v h t i w e c n a t i c a p a c n i n o i t a i r a v s a i b e s r e v e r 1 d n a 7 , 2 o t 8 , 1 s n i p 5 , 4 o t 6 , 3 s n i p v 5 . 2 o t 0 = r v z h m 1 = f d n a 7 , 2 o t 8 , 1 s n i p 5 , 4 o t 6 , 3 s n i p z h m 1 = f , v 5 . 2 = r v 3 . 1f p e c n a t i c a p a c n o i t c n u jc j d n g o t n i p o / i v r z h m 1 = f , v 0 = 5 . 46f p notes: 1) this parameter guaranteed by design and characterization and is not production tested
3 ? 2010 semtech corp. www.semtech.com protection products UCLAMP3312T non-repetitive peak pulse power vs. pulse time clamping voltage vs. peak pulse current normalized junction capacitance vs. reverse voltage typical insertion loss (s21) esd clamping (pin 1 to 2 and 2 to 1) (-8kv contact per iec 61000-4-2) note: data is taken with a 10x attenuator esd clamping (pin 1 to 2 and 2 to 1) (8kv contact per iec 61000-4-2) note: data is taken with a 10x attenuator 0 0.2 0.4 0.6 0.8 1 1.2 1.4 1.6 00.511.522.53 reverse voltage - v r (v) c j (v r ) / c j (v r =0v) f = 1 mhz 1 2 3 4 start . 030 mhz 3 stop 000 . 000 000 mhz ch1 s21 log 6 db / ref 0 db 1: -2.2287 db 800 mhz 2: -2.3884 db 900 mhz 3: -5.5200 db 1.8 ghz 4: -13.643 db 2.5 ghz 0 db -6 db -12 db -18 db -24 db -30 db -36 db 1 ghz 100 mhz 3 ghz 10 mhz 1 mhz -42 db -48 db 0.01 0.1 1 10 0.1 1 10 100 pulse duration - tp (us) peak pulse power - p pp (kw) 0 1 2 3 4 5 6 7 8 9 10 024681012 peak pulse current - i pp (a) clamping voltage - v c (v) waveform parameters: tr = 8 s td = 20 s
4 ? 2010 semtech corp. www.semtech.com protection products UCLAMP3312T applications information figure 1 - gbe protection to lightning, esd, and cde 1 2 3 4 5 6 7 8 rj-45 connector ethernet phy tp2+ tp2- tp3+ tp3- tp4+ tp4- tp1+ tp1- 1 2 3 4 5 6 7 8 rj-45 connector ethernet phy tp2+ tp2- tp3+ tp3- tp4+ tp4- tp1+ tp1- gigabit ethernet protection solutions ethernet systems with connections external to the building are subject to high-level transient threats. this type of equipment may even be required to meet the surge immunity requirements of telcordia gr- 1089. reliable protection of the ethernet transceiver requires a device that can absorb the expected transient energy, clamp the incoming surge to a safe level, and yet remain transparent to the system under normal operation. the UCLAMP3312T has been designed to meet these demanding requirements. typical ieee 802.3 template test results for a gbe circuit with UCLAMP3312T are shown in figure 2. transient protection when designing ethernet protection, the entire system must be considered. an ethernet port includes interface magnetics in the form of transformers and common mode chokes. transformers and chokes can be discrete components, but integrated solutions that include the rj-45 connector, resistors, capacitors, and protection are also available. in either case, the transformer will provide a high level of common mode isolation to external voltages, but no protection for metallic (line-to-line) surges. during a metallic transient event, current will flow into one line, through the transformer and back to the source. as the current flows, it charges the windings of the transformer on the line side. once the surge is removed, the windings on the line side will stop charging and will transfer its stored energy to the ic side where the phy ic is located. the magnitude and duration of the surge is attenuated by the inductance of the magnetics. the amount of attenuation will vary by vendor and configuration of the magnetics. it is this transferred energy that must be clamped by the protection circuitry. a typical protection scheme which utilizes the UCLAMP3312T is shown in figure 1. one device is placed across two line pairs and is located on the phy side of the transformer as close to the magnetics as possible. this is done to minimize parasitic inductance and improve clamping performance. in this design, the isolation voltage of the transformer is relied upon to suppress common mode lightning surges. high voltage capacitors and resistors are commonly utilized from the center tap to ground to aid in transient protection. metallic surges will be transferred in some form to the phy side and clamped by the UCLAMP3312T . the UCLAMP3312T will turn on when the voltage across it exceeds the punch-through voltage of the device. low voltage turn on is important since many phy chips have integrated esd protection structures. these structures are for protection of the device during manufacture and are not designed to handle large amounts of energy. should they turn on before the external protection, they can be damaged resulting in failure of the phy chip.
5 ? 2010 semtech corp. www.semtech.com protection products UCLAMP3312T figure 2 - typical ieee 802.3 template test results (with UCLAMP3312T) applications information point a point c point f point b point d point h
6 ? 2010 semtech corp. www.semtech.com protection products UCLAMP3312T spice model applications information - spice model s r e t e m a r a p e c i p s t 2 1 3 3 p m a l c u r e t e m a r a pt i n u) s v t ( 1 d) s v t ( 2 d s ip m a0 2 - e 10 2 - e 1 v bt l o v8 . 28 . 2 j vt l o v7 . 07 . 0 s rm h o2 . 02 . 0 v b ip m a3 - e 13 - e 1 o j cd a r a f2 1 - e 0 12 1 - e 1 t tc e s9 - e 1 4 5 . 29 - e 1 4 5 . 2 m- -5 0 . 05 0 . 0 n- -1 . 11 . 1 g ev e1 1 . 11 1 . 1
7 ? 2010 semtech corp. www.semtech.com protection products UCLAMP3312T outline drawing - slp2010n8t land pattern - slp2010n8t b bbb aaa n l e d dim a1 a2 a 0.30 0.20 0.25 0.40 0.30 0.08 0.10 8 0.35 2.00 0.50 bsc millimeters max 0.05 0.43 dimensions min 0.00 nom 0.37 0.02 (0.13) 0.40 controlling dimensions are in millimeters (angles in degrees). notes: 1. 1.00 e 2.10 1.90 0.90 1.10 e d a aaa c pin 1 indicator (laser mark) b c seating plane 12 n e bbb c a b a2 a1 a lxn bxn d/2 e/2 r e/2 r 0.15 0.05 0.10 x y z p/2 this land pattern is for reference purposes only. consult your manufacturing group to ensure your notes: 2. dim x y p g c millimeters (0.90) 0.30 0.65 0.50 0.25 dimensions company's manufacturing guidelines are met. 1.55 z controlling dimensions are in millimeters (angles in degrees). 1. (c) g p
8 ? 2010 semtech corp. www.semtech.com protection products UCLAMP3312T contact information semtech corporation protection products division 200 flynn rd., camarillo, ca 93012 phone: (805)498-2111 fax (805)498-3804 marking code ordering information 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 l e e r e z i s t c t . t 2 1 3 3 p m a l c uv 3 . 30 0 0 , 3h c n i 7 notes: 1) microclamp, uclamp and clamp are marks of semtech corporation tape and reel specification e p a t h t d i w ) x a m ( , bd1 de f p0 p2 ptw m m 8 m m 2 . 4 ) 5 6 1 . ( m m 1 . 0 + 5 . 1 m m 0 . 0 - 5 0 0 . + 9 5 . 0 ( ) 0 0 0 . - m m 4 . 0 5 2 . 0 ) 1 3 0 . ( 0 1 . 0 5 7 . 1 m m ) 4 0 0 . 9 6 0 . ( 5 0 . 0 5 . 3 m m ) 2 0 0 . 8 3 1 . ( 0 1 . 0 0 . 4 m m - 0 0 . 7 5 1 . ( ) 4 1 . 0 0 . 4 m m - 0 0 . 7 5 1 . ( ) 4 5 0 . 0 0 . 2 m m ) 2 0 0 . 9 7 0 . ( 2 0 . 0 4 5 2 . 0 ) 6 1 0 . ( m m m m 0 . 8 m m 3 . 0 + m m 1 . 0 - ) 2 1 0 . 2 1 3 . ( device orientation in tape pin 1 location user direction of feed 0 a0 b0 k m m 5 0 . 0 - / + 1 2 . 1m m 5 0 . 0 - / + 1 2 . 2m m 5 0 . 0 - / + 6 6 . 0 pin 1 indicator 3312t yyww yyww = date code
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