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this is information on a product in full production. march 2012 doc id 17862 rev 3 1/12 12 sm4ty automotive 400 w transil? datasheet ? production data features peak pulse power: ? 400 w (10/1000 s) ? 2.3 kw (8/20 s) stand-off voltage range: from 5 v to 70 v unidirectional and bidirectional types low leakage current: ? 0.2 a at 25 c ? 1 a at 85 c operating t j max : 150 c high power capability at t j max : ? 270 w (10/1000 s) jedec registered package outline resin meets ul 94, v0 aec-q101 qualified complies with the following standards iso 10605, c = 150 pf, r = 330 : ? 30 kv (air discharge) ? 30 kv (contact discharge) iso 10605, c = 330 pf, r = 330 : ? 30 kv (air discharge) ? 30 kv (contact discharge) iso 7637-2 (a) ? pulse 1: v s = -100 v ? pulse 2a: v s = +50 v ? pulse 3a: v s = -150 v ? pulse 3b: v s = +100 v description the sm4ty transil series has been designed to protect sensitive automotive circuits against surges defined in iso 7637-2 and against electrostatic discharges according to iso 10605. the planar technology ma kes it compatible with high-end circuits where low leakage current and high junction temperature are required to provide reliability and stability over time. sm4ty devices are packaged in sma (sma footprint in accordance with ipc 7531 standard). tm : transil is a trademark of stmicroelectronics a. not applicable to parts with stand-off voltage lower than the average battery voltage (13.5 v) k a unidirectional bidirectional sma (jedec do-214ac) www.st.com
characteristics sm4ty 2/12 doc id 17862 rev 3 1 characteristics figure 1. electrical characteristics - definitions figure 2. pulse definition for electrical characteristics table 1. absolute maximum ratings (t amb = 25 c ) symbol parameter value unit v pp peak pulse voltage iso 10605 (c = 150 pf, r = 330 ) contact discharge air discharge iso 10605, c = 150 pf, r = 330 : contact discharge air discharge 30 30 30 30 kv p pp peak pulse power dissipation (1) t j initial = t amb 400 w t stg storage temperature range -65 to + 150 c t j operating junction temperature range -55 to + 150 c t l maximum lead temperature for soldering during 10 s. 260 c 1. for a surge greater than the maximum val ues, the diode will fail in short-circuit. v cl v br v rm i rm i r i pp v i i rm i r i pp v rm v br v cl v cl v br v rm i rm i r i pp v i i rm i r i pp v rm v br v cl v cl v br v rm i rm i r i pp v i i f v f v cl v br v rm i rm i r i pp v i i f v f unidirectional bidirectional symbol parameter v stand-off voltage v breakdown voltage v clamping voltage i leakage current @ v i peak pulse current t voltage temperature coefficient v forward voltage drop r dynamic resistance rm br cl rm rm pp f d 100 50 0 pulse waveform tr = rise time (s) tp = pulse duration time (s) t %i pp t p t r
sm4ty characteristics doc id 17862 rev 3 3/12 table 2. electrical characteristics, typical values if not otherwise stated (t amb = 25 c) order code i rm max @ v rm v br @ i r (1) v cl @ i pp 10/1000 s r d 10/1000 s v cl @ i pp 8/20 s r d 8/20 s t (2) 25 c 85 c min. typ. max. max. max. max a v v ma v (3) a (4) v (3) a (4) 10-4/ c sm4t6v7ay/cay 20 50 5 6.4 6.74 7.1 10 9.2 43.5 0.049 13.4 174 0.036 5.7 sm4t7v6ay/cay 20 50 6.5 7.2 7.58 8.0 10 11.2 35.7 0.091 14.5 160 0.041 6.1 sm4t10ay/cay 20 50 8.5 9.4 9.9 10. 4 1 14.4 27.7 0.145 19.5 124 0.073 7.3 sm4t12ay/cay 0.2 1 10 11.1 11.7 12. 3 1 17.0 23.5 0.201 21.7 106 0.089 7.8 sm4t14ay/cay 0.2 1 12 13.3 14.0 14. 7 1 19.9 20.1 0.259 25.3 91 0.116 8.3 sm4t15ay/cay 0.2 1 13 14.4 15.2 16. 0 1 21.5 18.6 0.298 27.2 85 0.132 8.4 sm4t18ay/cay 0.2 1 15 16.7 17.6 18. 5 1 24.4 16.4 0.361 32.5 71 0.197 8.8 sm4t21ay/cay 0.2 1 18 20.0 21.1 22. 2 1 29.2 13.7 0.514 39.3 59 0.291 9.2 sm4t23ay/cay 0.2 1 20 22.2 23.4 24. 6 1 32.4 12.3 0.637 42.8 54 0.338 9.4 sm4t26ay/cay 0.2 1 22 24.4 25.7 27. 0 1 35.5 11.2 0.760 48.3 48 0.444 9.6 sm4t28ay/cay 0.2 1 24 26.7 28.1 29. 5 1 38.9 10.3 0.912 50 46 0.446 9.6 sm4t30ay/cay 0.2 1 26 28.9 30.4 31. 9 1 42.1 9.5 1.07 53.5 43 0.502 9.7 sm4t33ay/cay 0.2 1 28 31.1 32.7 3 4.3 1 45.4 8.8 1.26 59 39 0.632 9.8 sm4t35ay/cay 0.2 1 30 33.3 35.1 36. 9 1 48.4 8.3 1.39 64.3 36 0.762 9.9 sm4t39ay/cay 0.2 1 33 36.7 38.6 4 0.5 1 53.3 7.5 1.70 69.7 33 0.884 10 sm4t47ay/cay 0.2 1 40 44.4 46.7 4 9.0 1 64.5 6.2 2.49 84 27 1.30 10.1 sm4t50ay/cay 0.2 1 43 47.8 50.3 5 2.8 1 69.4 5.7 2.91 91 25 1.53 10.2 sm4t56ay/cay 0.2 1 48 53.3 56.1 58. 9 1 77.4 5.2 3.56 100 23 1.79 10.3 sm4t68ay/cay 0.2 1 58 64.4 67.8 71. 2 1 93.6 4.3 5.21 121 19 2.62 10.4 sm4t82ay/cay 0.2 1 70 77.8 81.9 8 6.0 1 113 3.5 7.72 146 16 3.75 10.5 1. pulse test: t p < 50 ms 2. to calculate maximum clamping voltage at other surge level, use the following formula: v cl max = v cl - r d x (i pp - i ppappli ) where i ppappli is the surge current in the application 3. to calculate v br or v cl versus junction temperature, use the following formulas: v br @ t j = v br @ 25 c x (1 + t x (t j - 25)) v cl @ t j = v cl @ 25 c x (1 + t x (t j - 25)) 4. surge capability given for both directions for unidirectional and bidirectional types.
characteristics sm4ty 4/12 doc id 17862 rev 3 figure 3. peak pulse power dissipation versus initial junction temperature figure 4. peak pulse power versus exponential pulse duration (t j initial = 25 c) 0 100 200 300 400 500 0 25 50 75 100 125 150 175 p (w) pp t (c) j pulse = 10/1000 s 0.1 1.0 10.0 1.0e-03 1.0e-02 1.0e-01 1.0e+00 1.0e+01 p (kw) pp t p (ms) figure 5. clamping voltage versus peak pulse current (exponential waveform, maximum values) figure 6. junction capacitance versus reverse applied voltage for unidirectional types (typical values) i (a) pp 0.1 1.0 10.0 100.0 1000.0 1 10 100 1000 10/1000 s 8/20 s v (v) cl t initial = 25 c j sm4t6v7ay/cay sm4t30ay/cay sm4t82ay/cay c(pf) 10 100 1000 10000 1 10 100 1000 sm4t6v7ay sm4t30ay sm4t82ay v (v) r f = 1 mhz v = 30 mv t = 25 c osc rms j figure 7. junction capacitance versus reverse applied voltage for bidirectional types (typical values) figure 8. relative variation of thermal impedance, junction to ambient, versus pulse duration c(pf) 10 100 1000 10000 1 10 100 1000 sm4t6v7cay sm4t30cay sm4t82cay v (v) r f = 1 mhz v = 30 mv t = 25 c osc rms j 0.01 0.10 1.00 1.0e-03 1.0e-02 1.0e-01 1.0e+00 1.0e+01 1.0e+02 1.0e+03 recommended pad layout z/r th(j-a) th(j-a) t p (s) printed circuit board fr4, copper thickness = 35 m
sm4ty characteristics doc id 17862 rev 3 5/12 figure 11. peak forward voltage drop versus peak forward current (typical values) figure 9. thermal resistance junction to ambient versus copper surface under each lead figure 10. leakage current versus junction temperature (typical values) 0 10 20 30 40 50 60 70 80 90 100 110 120 130 0.0 0.5 1.0 1.5 2.0 2.5 3.0 3.5 4.0 4.5 5.0 r (c/w) th(j-a) s (cm2) cu printed circuit board fr4, copper thickness = 35 m 1.e-01 1.e+00 1.e+01 1.e+02 1.e+03 25 50 75 100 125 150 i (na) r t (c) j v=v v10v rrm rm v=v v < 10 v rrm rm 1.0e-02 1.0e-01 1.0e+00 1.0e+01 1.0e+02 0.0 0.5 1.0 1.5 2.0 2.5 3.0 3.5 t = 125 c j i (a) fm t = 25 c j v (v) fm
characteristics sm4ty 6/12 doc id 17862 rev 3 figure 12. iso7637-2 pulse 1 response (v s = -100 v) figure 13. iso7637-2 pulse 2a response (v s = 50 v) 10 -10 0 -40 -30 -20 -50 -0.5 0.0 0.5 1.0 1.5 2.0 2.5 -0.5 0.0 0.5 1.0 1.5 2.0 2.5 voltage (v) voltage current current (a) time (ms) time (ms) sm4t39ay sm4t39cay sm4t39ay sm4t39cay -15 -10 0.0 0 5 50 10 20 30 40 0 -51 -1 49 99 149 199 249 -51 -1 49 99 149 199 249 0 4 -4 voltage (v) voltage current current (a) time (s) time (s) sm4t39ay sm4t39cay sm4t39ay sm4t39cay
sm4ty characteristics doc id 17862 rev 3 7/12 figure 14. iso7637-2 pulse 3a response (v s = -150 v) figure 15. iso7637-2 pulse 3b response (v s = 100 v) note: iso7637-2 pulses responses are not applicable for product with a stand off voltage lower than the average battery voltage (13.5 v). -60 -50 -40 -30 -20 -10 0 10 20 30 -2 -1.5 -1 -0.5 0 0.5 -2.5 -0.2 0.8 1.8 0.0 0.0 0.0 -0.2 0.8 1.8 0.0 0.0 0.0 voltage ( v ) voltage current current (a) time (s) time (s) sm4t39ay sm4t39cay sm4t39ay sm4t39cay 0 20 30 40 50 10 -0.2 1.8 0.8 -0.4 1.2 0.8 0.4 0.0 -0.2 1.8 0.8 -0.2 1.8 0.8 sm4t39ay sm4t39cay sm4t39ay sm4t39cay voltage (v) voltage current current (a) time (s) time (s)
application and design guidelines sm4ty 8/12 doc id 17862 rev 3 2 application and design guidelines more information is available in the application note an2689 ?protection of automotive electronics from electrical hazards, guidelines for design and component selection?. 3 ordering information scheme figure 16. ordering information scheme surface mount surge rating 4 = 400 w transil in sma breakdown voltage type s ca = bidirectional a = unidirectional automotive grade sm 4t xx ca y
sm4ty package information doc id 17862 rev 3 9/12 4 package information case: jedec do-214ab molded plastic over planar junction terminals: solder plated, solderable as per mil-std-750, method 2026 polarity: for unidirectional types the band indicates cathode flammability: epoxy is rated ul 94, v0 rohs 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. table 3. sma dimensions ref. dimensions millimeters inches min. max. min. max. a1 1.90 2.45 0.075 0.094 a2 0.05 0.20 0.002 0.008 b 1.25 1.65 0.049 0.065 c 0.15 0.40 0.006 0.016 d 2.25 2.90 0.089 0.114 e 4.80 5.35 0.189 0.211 e1 3.95 4.60 0.156 0.181 l 0.75 1.50 0.030 0.059 figure 17. sma footprint dimensions in mm (inches) figure 18. marking layout (1) 1. marking layout can vary according to assembly location. e c l e1 d a1 a2 b 2.63 (0.104) 5.43 (0.214) 1.4 1.64 (0.064) 1.4 (0.055) (0.055) y w w z x x x ecopack compliance z: manufacturing location y: year ww: week cathode bar ( unidirectional devices only ) x xxxx: marking
package information sm4ty 10/12 doc id 17862 rev 3 table 4. marking order code marking order code marking sm4t6v7ay aey sm4t6v7cay aay sm4t7v6ay ducy sm4t7v5cay dbcy sm4t10ay duhy sm4t10cay dbhy sm4t12ay axy sm4t12cay acy sm4t14ay duky sm4t14cay dbky sm4t15ay bgy sm4t15cay bhy sm4t18ay bmy sm4t18cay ajy sm4t21ay duqy sm4t21cay dbqy sm4t23ay dury sm4t23cay dbry sm4t26ay dusy sm4t26cay dbsy sm4t28ay duty sm4t28cay dbty sm4t30ay duuy sm4t30cay dbuy sm4t33ay cgy sm4t33cay chy sm4t35ay cky sm4t35cay cly sm4t39ay cmy sm4t39cay cny sm4t47ay duzy sm4t47cay dbzy sm4t50ay euay sm4t50cay ebay sm4t56ay cxy sm4t56cay cyy sm4t68ay eufy sm4t68cay ebfy sm4t82ay euiy sm4t82cay ebiy
sm4ty ordering information doc id 17862 rev 3 11/12 5 ordering information 6 revision history table 5. ordering information order code marking package weight base qty delivery mode sm4txxxay/cay (1) 1. where xxx is nominal value of v br and a or ca indicates unidirectional or bidirectional version. see table 2 for list of available devices and their order codes see table 4 on page 10 sma 0.072 g 5000 tape and reel table 6. document revision history date revision changes 08-sep-2010 1 initial release. 09-nov-2011 2 added order codes in ta b l e 2 and ta bl e 4 . updated figure 5 , 6 and 7 . 27-mar-2012 3 added footnote on page 1.
sm4ty 12/12 doc id 17862 rev 3 please read carefully: information in this document is provided solely in connection with st products. stmicroelectronics nv and its subsidiaries (?st ?) reserve the right to make changes, corrections, modifications or improvements, to this document, and the products and services described he rein at any time, without notice. all st products are sold pursuant to st?s terms and conditions of sale. purchasers are solely responsible for the choice, selection and use of the st products and services described herein, and st as sumes no liability whatsoever relating to the choice, selection or use of the st products and services described herein. no license, express or implied, by estoppel or otherwise, to any intellectual property rights is granted under this document. i f any part of this document refers to any third party products or services it shall not be deemed a license grant by st for the use of such third party products or services, or any intellectual property contained therein or considered as a warranty covering the use in any manner whatsoev er of such third party products or services or any intellectual property contained therein. unless otherwise set forth in st?s terms and conditions of sale st disclaims any express or implied warranty with respect to the use and/or sale of st products including without limitation implied warranties of merchantability, fitness for a parti cular purpose (and their equivalents under the laws of any jurisdiction), or infringement of any patent, copyright or other intellectual property right. unless expressly approved in writing by two authorized st representatives, st products are not recommended, authorized or warranted for use in milita ry, air craft, space, life saving, or life sustaining applications, nor in products or systems where failure or malfunction may result in personal injury, death, or severe property or environmental damage. st products which are not specified as "automotive grade" may only be used in automotive applications at user?s own risk. resale of st products with provisions different from the statements and/or technical features set forth in this document shall immediately void any warranty granted by st for the st product or service described herein and shall not create or extend in any manner whatsoev er, any liability of st. st and the st logo are trademarks or registered trademarks of st in various countries. information in this document supersedes and replaces all information previously supplied. the st logo is a registered trademark of stmicroelectronics. all other names are the property of their respective owners. ? 2012 stmicroelectronics - all rights reserved stmicroelectronics group of companies australia - belgium - brazil - canada - china - czech republic - finland - france - germany - hong kong - india - israel - ital y - japan - malaysia - malta - morocco - philippines - singapore - spain - sweden - switzerland - united kingdom - united states of america www.st.com

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