this is information on a product in full production. october 2012 doc id 11085 rev 3 1/8 8 ITAXXB3 bidirectional transil?, transien t voltage surge suppressor (tvs) array for data line protection datasheet ? production data features high surge capabilit y transil array: i pp = 40 a (8/20 s) peak pulse power: 300 w (8/20 s) separated input - output up to 9 bidirectional transil functions low clamping factor (v cl /v br ) at high current level low leakage current esd protection up to 15 kv complies with the following standards iec 61000-4-2 level 4 ? 15 kv (air discharge) ? 8 kv (contact discharge) mil std 883g- method 3015-7: class 3b ? 25 kv (human body model) applications differential data transmis sion lines protection, such as: rs-232 rs-423 rs-422 rs-485 tm: transil is a trademar k of stmicroelectronics description transil diode arrays provide high overvoltage protection by clamping action. their instantaneous response to transient overvoltages makes them particularly suited to protect voltage sensitive devices such as mos technology and low voltage supplied ics. the ita series combines high surge capability against energetic pulses with high voltage performance against esd. the separated input/output configuration of the device ensures improved protection against very fast transient overvoltage like esd by elimination of the spikes induced by parasitic inductances created by external wiring. figure 1. functional diagram so-20 1 2 3 4 8 7 6 5 20 19 18 17 16 15 14 13 12 11 9 10 gnd gnd gnd gnd input output input output input output input output input output input output input output input output www.st.com
characteristics ITAXXB3 2/8 doc id 11085 rev 3 1 characteristics table 1. absolute ratings (t amb = 25 c) symbol parameter value unit p pp peak pulse power (8/20 s) (1) 1. for surges greater than the specified maximum value, the i/o will first present a short-circuit and after an open circuit caused by the wire melting. t j initial = t amb 300 w i pp peak pulse current (8/20 s) (1) t j initial = t amb 40 a i 2 twire i 2 t value (1) 0.6 a 2 s t j maximum operating junction temperature 125 c t stg storage temperature range -55 to +150 c t l maximum lead temperature for soldering during 10 s 260 c table 2. electrical characteristics (definitions, t amb = 25 c) symbol parameter v rm stand-off voltage v br breakdown voltage v cl clamping voltage i rm leakage current i pp peak pulse current ? t voltage temperature coefficient v f forward voltage drop c capacitance table 3. electrical characteristics (values, t amb = 25 c) order code v br (1) 1. between i/o pin and ground. @ i r i rm @ v rm v cl (1) @ i pp v cl (1) @ i pp ? tc (2) 2. between two input pins at 0 v bias, f = 1 mhz. min. max. max. 8/20 s max. 8/20 s max. max. vmaa v v a v a10 -4 /c pf ita6v5b3 6.5 1 10 5 9.5 10 12.1 25 4 1100 ita18b3 18 1 4 1521102625 9500 ita25b3 25 1 4 2431103625 12420 v br v cl v rm i rm i pp i v
ITAXXB3 characteristics doc id 11085 rev 3 3/8 figure 2. pulse waveform figure 3. ty pical peak pulse power versus exponential pulse duration %i pp t 8 s 100 50 0 20 s pulse waveform 8/20 s p pp (w) 1e-03 1e-02 1e-01 1e+00 1e+01 1e+02 1e+01 1e+02 1e+03 1e+04 t j initial=25c t p (ms) expo ita18b3 ita25b3 ita6v5b3 figure 4. clamping voltage versus peak pulse current (exponential waveform 8/20 s) figure 5. peak current i dc inducing open circuit of the wire for one input/output versus pulse duration v cl (v) t j initial=25c i pp (a) 1e+00 1e+01 1e+02 1e+03 1e-01 1e+00 1e+01 1e+02 ita18b3 ita25b3 ita6v5b3 %i pp t r 100 50 0 t p t i (a) dc t (ms) p 1e+00 1e+01 1e+02 1e+03 1e-02 1e-01 1e+00 1e+01 exponential waveform typical values figure 6. junction capacitance versus reverse applied voltage for one input/output (typical values) figure 7. relative variation of leakage current versus junction temperature c(pf) t j =25c f=1mhz v r (v) 1e+02 1e+03 1e+00 1e+01 1e+02 ita18b3 ita25b3 ita6v5b3 5e+3 1e+3 1e+2 1e+1 0 25 50 75 100 125 150 1e+0 1e-1 t j (c) i r (t ) i (t =25c) j rj v r =v rm
application information ITAXXB3 4/8 doc id 11085 rev 3 2 application information this monolithic transil array is based on 10 unidirectional transils with a common cathode and can be configured to offer up to 9 bidirectional functions. this imposes a maximum differential voltage between 2 input pins (see ta b l e 4 ). figure 8. rs-232 junction (typical application) table 4. maximum differential voltages order code maximum differential volt age between two input pins at 25c ita6v5b3 3.5 v ita18b3 9.0 v ita25b3 12.5 v tx dtr dsr carrier det. aux cts rts rx gnd
ITAXXB3 ordering information scheme doc id 11085 rev 3 5/8 2.1 design advantage of ITAXXB3 used with 4-point structure the itaxxxb3 has been designed with a 4-point structure (separated input/output) to efficiently protect against disturbances with very high di/dt rates, such as esd. the purpose of this 4-point structure is to eliminate the overvoltage introduced by the parasitic inductances of the wiring (ldi/dt). efficient protection depends not only on the component itself, but also on the circuit layout. figure 9 shows the layout to be used to take advantage of the 4-point structure of the itaxxxb3. with this layout, each line to be protected passes through the protection device. this approach provides a highly effective interface between the data line and the circuit to be protected, guaranteeing an isolation between its inputs and outputs. figure 9. the 4 point structure 3 ordering information scheme figure 10. ordering information scheme u chip input 1 di/dt gnd device to be protected gnd output 1 ita 25 b 3 rl integrated transil array breakdown voltage (min) 25 = 25 v type of lines protected b = bidirectional package 3 = so-20 packaging rl = tape and reel blank = tube
package information ITAXXB3 6/8 doc id 11085 rev 3 4 package information epoxy meets ul94, v0 lead-free package in order to meet environmental requirements, st offers these devices in different grades of ecopack ? packages, depending on their level of environmental compliance. ecopack ? specifications, grade definitions and product status are available at: www.st.com . ecopack ? is an st trademark. figure 11. so-20 footprint (dimensions in mm) table 5. so-20 dimensions ref. dimensions millimeters inches min. typ. max. min. typ. max. a 2.35 2.65 0.092 0.104 a1 0.10 0.30 0.004 0.008 b 0.33 0.51 0.013 0.020 c 0.23 0.32 0.009 0.013 d 12.6 13.0 0.484 0.512 e 7.40 7.60 0.291 0.299 e 1.27 0.050 h 10.0 10.65 0.394 0.419 h 0.25 0.75 0.010 0.029 l 0.40 1.27 0.016 0.050 k 8 (max) eh a a1 b e d k hx45 c l 1.27 0.6 8.5 11.2
ITAXXB3 ordering information doc id 11085 rev 3 7/8 5 ordering information 6 revision history table 6. ordering information order code marking package weight base qty delivery mode ita6v5b3 ita6v5b3 so-20 0.55 g 1000 tube ita18b3 ita18b3 1000 tube ita18b3rl ita18b3 1000 tape and reel ita25b3 ita25b3 1000 tube ita25b3rl ita25b3 1000 tape and reel table 7. document revision history date revision changes 13-dec-2004 1 initial release. 07-nov-2007 2 reformatted to current standards. updated leakage current values in ta bl e 2 updated pulse waveform parameters in figure 2 . 09-oct-2012 3 updated ta bl e 3 and resized text in figure 8 for readability.
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