1/6 ita6v5b3 / ita10b3 ita18b3 / ITA25B3 ? august 2001- ed: 2 bidirectional transil tm array for dataline protection so-20 differential data transmission lines protection : - rs-232 - rs-423 - rs-422 - rs-485 applications application specific discretes a.s.d. tm functional diagram n high surge capability transil array i pp = 40 a (8/20 m s) n peak pulse power : 300 w (8/20 m s) n separated input-output n up to 9 bidirectional transil functions n low clamping factor (v cl /v br ) at high current level n low leakage current n esd protection up to 15kv features 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 allies 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. iec 1000-4-2 : level 4 iec 1000-4-4 : level 4 iec 1000-4-5 : level 2 mil std 883c - method 3015-6 : class 3 (human body model) complies with the following standards :
ita6v5b3 / ita10b3 / ita18b3 / ITA25B3 2/6 symbol parameter v rm stand-off voltage v br breakdown voltage v cl clamping voltage i rm leakage current @ v rm i pp peak pulse current a t voltage temperature coefficient c junction capacitance electrical characteristics (t amb = 25c) symbol parameter value unit p pp peak pulse power dissipation (8/20 m s) (see note 1) tj initial = t amb 300 w i pp peak pulse current (8/20 m s) (see note 1) tj initial = t amb 40 a i 2 t wire i 2 t value (see note 1) 0.6 a 2 s t stg t j storage temperature range maximum operating junction temperature -55to+150 125 c c t l maximum lead temperature for soldering during 10s 260 c absolute maximum ratings (t amb = 25c) 100 50 0 20 s t %i pp 8s pulse wave form 8/20 s types i rm @v rm v br @i r v cl @i pp v cl @i pp a tc max. min. 8/20 m s max. 8/20 m s max. max. note 2 note 2 note 2 note 3 m avvmavava10 -4 /c pf ita6v5b3 10 5 6.5 1 9.5 10 11 25 4 1100 ita10b3 4 8 10 1 13101725 8800 ita18b3 4 1518 1 21102625 9500 ITA25B3 4 2425 1 3110362512420 note 2 : between i/o pin and ground. note 3 : between two input pins at 0v bias. preferred types in bold. note 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.
ita6v5b3 / ita10b3 / ita18b3 /ITA25B3 3/6 p(w) 1e-03 1e-02 1e-01 1e+00 1e+01 1e+02 1e+01 1e+02 1e+03 1e+04 p tinitial=25c o j t(ms)expo p ITA25B3 ita18b3 ita10b3 ita6v5b3 p fig. 1 : typical peak pulse power versus exponential pulse duration. i(a) 1e-02 1e-01 1e+00 1e+01 1e+00 1e+01 1e+02 1e+03 dc exponential waveform t(ms) fig. 3 : peak current i dc inducing open circuit of the wire for one input/output versus pulse duration (typical values). fig. 4 : junction capacitance versus reverse applied voltage for one input/output (typical values). fig. 2 : clamping voltage versus peak pulse current (exponential waveform 8/20 m s). fig. 5 : relative variation of leakage current versus junction temperature
ita6v5b3 / ita10b3 / ita18b3 / ITA25B3 4/6 this monolithic transil array is based on 10 unidirectional transils with a common cathode and can be configurated to offer up to 9 bidirectional functions. this imposes a maximum differential voltage between 2 input pins (see opposite table). types maximum differential voltage between two input pins at 25c ita6v5b3 + / - 3.5 v ita10b3 + / - 5.0 v ita18b3 + / - 9.0 v ITA25B3 + / - 12.5 v application information carrier det. gnd cts rts tx rx aux dsr dtr typical application : rs232 junction.
ita6v5b3 / ita10b3 / ita18b3 /ITA25B3 5/6 design advantage of itaxxxb3 used with 4-point structure. the itaxxxb3 has been designed with a 4-point structure (separated input/output) in order 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.the drawing given in figure shows the layout to be used in order to take advantage of the 4-point structure of the itaxxxb3. with this layout, each line to be protected passes through the protection device. in this way, it realizes an interface between the data line and the circuit to be protected, guaranteeing an isolation between its inputs and outputs. application notice the 4 - point structure layout. ita 25 b 3 rl integrated transil array v min br bidirectional packaging: rl = tape & reel = tube package: so-20 plastic order code
ita6v5b3 / ita10b3 / ita18b3 / ITA25B3 6/6 type marking ita6v5b3 ita6v5b2 ita10b3 ita10b3 ita18b3 ita18b3 ITA25B3 ITA25B3 marking information furnished is believed to be accurate and reliable. however, stmicroelectronics assumes no responsibility for the consequences of use of such information nor for any infringement of patents or other rights of third parties which may result from its use. no license is granted by implication or otherwise under any patent or patent rights of stmicroelectronics. specifications mentioned in this publication are subject to change without notice. this publication supersedes and replaces all information previously supplied. stmicroelectronics products are not authorized for use as critical components in life support devices or systems without express written ap- proval of stmicroelectronics. the st logo is a registered trademark of stmicroelectronics ? 2001 stmicroelectronics - printed in italy - all rights reserved. stmicroelectronics group of companies australia - brazil - china - finland - france - germany - hong kong - india - italy - japan - malaysia malta - morocco - singapore - spain - sweden - switzerland - united kingdom - u.s.a. http://www.st.com package mechanical data so-20 (plastic) ref. dimensions millimetres inches min. typ. max. min. typ. max. a 2.65 0.104 a1 0.10 0.20 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 0.50 0.020 l 0.50 1.27 0.020 0.050 k 8 (max) packaging : standard packaging is tape and reel. weight : 0.55g.
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