ESDA6V1FUX ? november 1998 - ed: 1 9-bit wide undershoot and overshoot clamping functions. breakdown voltage : v br = 6.1v min. forward voltage v f = 1.25v max. @ i f =200ma low capacitance: c =130pf @ v rm =5.25v. low clamping voltage. 200w peak pulse power (8/20 m s). features ssop20 pin-out configuration i1 o1 i2 o2 i3 o3 i4 o4 i5 o5 gnd gnd i6 o6 i7 o7 i8 o8 i9 o9 esd protection of 25 kv, according to mil std- method 3015-6. high integration. four points structure, avoiding all esd effects at the outputs. benefits esd protection monolithic 9-bit wide transil tm array application specific discretes a.s.d. tm where protection in esd sensitive equipmentis re- quired, such as : - computers - printers - communication systems main applications the ESDA6V1FUX is a monolithic transil array designed to provide a 9-bit wide undershoot and overshoot clamping function in association with esd protection level of up to 25 kv. the ESDA6V1FUX provides best efficiency when using separated inputs and outputs, in the so called 4-point structure. description so20 transil is a trademark of stmicroelectronics - esd standard : . iec 1000-4-2 level4 15kv (air discharge) 8kv (contactdischarge) - mil std 883c - method 3015-6 v p = 25 kv c = 100 pf r = 1500 w 3 positive strikes and 3 negative strikes (f = 1 hz) - human body test : v p = 4 kv c = 150 pf r = 150 w complieswiththe followingstandards : 1/7
symbol parameter value unit v pp maximum electrostatic discharge in following measure- ment conditions: mil std 883c - method 3015-6 iec1000-4-2 - air discharge iec1000-4-2 - contact discharge 25 16 9 kv p pp peak pulse power (8/20 m s) 200 w t stg t j storage temperature maximum junction temperature - 55 to + 150 125 c c absolute maximum ratings (t amb = 25 c) symbol parameter v rm stand-off voltage v br breakdown voltage v cl clamping voltage v f forward voltage drop c capacitance rd dynamic impedance i rm leakage current i pp peak pulse current symbol test conditions min. typ. max. unit i rm v rm = 5.25 v, between any i/o pin and gnd 20 m a v br i r = 1 ma, between any i/o pin and gnd 6.1 7.2 v v f if = 200 ma, between any i/o pin and gnd 1.25 v rd i pp =15a,t p = 2.5 m s (note 1) 0.2 w c between any i/o pin and gnd at 0 v bias between any i/o pin and gnd at v rm = 5.25 v 260 130 pf note 1 : see the calculation of the clamping voltage. ESDA6V1FUX 2/7
the esda family has been designed to clamp fast spikes like esd. generally the pcb designers need to calculate easily the clamping voltage v cl . this is why we give the dynamic resistance in ad- dition to the classical parameters. the voltage across the protection cell can be calculated with the following formula: v cl =v br +rdi pp where ipp is the peakcurrentthroughthe esda cell. dynamic resistance measurement the short duration of the esd has led us to prefer a more adapted test wave, as below defined, to the classical 8/20 m s and 10/1000 m s surges. 2.5 m s duration measurement wave. as the value of the dynamic resistance remains stable for a surge duration lower than 20 m s, the 2.5 m s rectangularsurge is well adapted. in addition both rise and fall times are optimized to avoid any parasitic phenomenon during the measurement of rd. calculation of the clamping voltage use of the dynamic resistance 2 m s tp = 2.5 m s t i ipp ESDA6V1FUX 3/7
0 25 50 75 100 125 150 0.0 0.1 0.2 0.3 0.4 0.5 0.6 0.7 0.8 0.9 1.0 1.1 ppp[tj initial]/ppp[tj initial=25 c] tj initial( c) fig 1: peak power dissipation versus initial junction temperature. 1 10 100 10 100 1000 2000 ppp(w) tp( m s) fig 2: peak pulse power versus exponential pulse duration (tj initial=25 c). 456789101112 0.1 1.0 10.0 30.0 ipp(a) tp=2.5 m s vcl(v) (output voltage) fig 3: clamping voltage versus peak pulse current (tj initial=25 c, rectangular waveform tp=2.5 m s). 12 510 100 120 140 160 180 200 c(pf) f=1mhz vosc=30mv vr(v) fig 4: capacitanceversus reverse applied voltage (typical values). 25 50 75 100 125 0.0 0.5 1.0 1.5 2.0 2.5 3.0 ir[tj] / ir[tj=25 c] tj( c) fig 5: relative variation of leakage current versus junction temperature (typical values). 0.6 0.8 1.0 1.2 1.4 1.6 1.8 0.01 0.10 1.00 5.00 ifm(a) vfm(v) fig 6: peak forward voltage drop versus peak forward current (typical values). rectangular waveform: tp = 2.5 m s ESDA6V1FUX 4/7
esd protection by the ESDA6V1FUX electrostatic discharge (esd) is a major cause of failure in electronic systems. transientvoltage suppressors (tvs) are an ideal choice for esd protection.they are capableof clamping the incoming transient to a low enough level such that damage to the protected semiconductor is pre- vented. surface mount tvs arrays offer the best choice for minimal lead inductance. they serve as parallel protection elements, connected between the signal line to ground. as the transient rises above the operatingvoltage of the device, the tvs array becomes a low impedance path diverting the transient current to ground. the ESDA6V1FUX array is the ideal board level protection of esd sensitive semiconductor components. it provides best efficiency when using separated inputs and outputs, in the so called 4-points structure. circuit board layout circuit board layout is a critical design step in the suppression of esd induced transients. the following guidelines are recommended : the ESDA6V1FUX should be placed as near as possible to the input terminals or connectors. the path length between the esd suppressor and the protected line should be minimized. all conductive loops, including power and ground loops should be minimized. the esd transient return path to ground should be kept as short as possible. ground planes should be used whenever possible. fig. 7 : example of connection for one cell of the ESDA6V1FUX fig. 8 : recommended pcb layout to benefit from 4 point structure ESDA6V1FUX 5/7
package mechanical data so20 (plastic) k hx45 c l a a1 b e d eh ref. dimensions millimeters inches min. typ. max. min. typ. max. a 2.35 2.65 0.092 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 0.25 0.75 0.010 0.029 l 0.50 1.27 0.020 0.050 k8 (max) part numbering and ordering information esda 6v1 f u 3 rl electro static discharge array v br mim packing : rl = tape & reel blank = tube four point structure package : 3 : so20 6 : ssop20 unidirectional transil ESDA6V1FUX 6/7
package mechanical data ssop20 (plastic) l e k b e a 11 10 1 20 d e1 a 2 a1 c 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 infringementof 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 ? 1998 stmicroelectronics - printed in italy - all rights reserved. stmicroelectronics group of companies australia - brazil - canada - china - france - germany - italy - japan - korea - malaysia - malta - mexico - morocco - the netherlands - singapore - spain - sweden - switzerland - taiwan - thailand - united kingdom - u.s.a. http://www.st.com ref. dimensions millimeters inches min. typ. max. min. typ. max. a 2.00 0.079 a1 0.25 0.010 a2 1.51 2.00 0.059 0.079 b 0.25 0.30 0.35 0.010 0.012 0.014 c 0.10 0.35 0.004 0.014 d 7.05 8.05 0.278 0.317 e 7.60 8.70 0.299 0.343 e1 5.02 6.10 6.22 0.198 0.240 0.245 e 0.65 0.026 k0 10 0 10 l 0.25 0.50 0.80 0.010 0.020 0.031 order code marking package weight delivery mode base qty (pcs) esda6v1fu3 esda6v1fu3 so20 0.52g tube 50 esda6v1fu3rl esda6v1fu3 so20 0.52g tape & reel 1000 esda6v1fu6 esda6v1fu6 ssop20 0.18g tube 66 esda6v1fu6rl esda6v1fu6 ssop20 0.18g tape & reel 2000 ordering code ESDA6V1FUX 7/7
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