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as431 document number: ds36599 rev. 3 - 2 1 of 19 www.diodes.com october 2013 ? diodes incorporated a s431 a product line o f diodes incorporated adjustable precisio n shunt regulators description the as431 is a three-terminal adj ustable shunt regulator with guaranteed thermal stability over a full operation range. it features sharp turn-on characteristics, low temperature coefficient and low output impedance, which make it ideal substitute for zener diode in applications such as switching power supply, charger and other adjustable regulators. the output voltage of as431 can be set to any value between vref (2.5v) and the corresponding maximum cathode voltage (36v). the as431 precision reference is offered in two voltage tolerance: 0.5% and 1.0%. this ic is available in 4 pack ages: to-92 (bulk or ammo packing), sot-23, sot-23-5 and sot-89. applications ? charger ? voltage adapter ? switching power supply ? graphic card ? precision voltage reference features ? programmable precise output voltage from 2.5v to 36v ? high stability under capacitive load ? low temperature deviation: 4.5mv typical ? low equivalent full-range temperature coefficient with 20ppm/c typical ? sink current capacity from 1ma to 100ma ? low output noise ? wide operating range of -40 to +125c ? lead-free packages: sot-23, sot-23-5, to-92, sot-89 ? totally lead-free; rohs compliant (notes 1 & 2) ? lead-free packages, available in ?green? molding compound: sot-23, sot-23-5, to-92, sot-89 ? totally lead-free & fully rohs compliant (notes 1 & 2) ? halogen and antimony free. ?green? device (note 3) notes: 1. no purposely added lead. fully eu directiv e 2002/95/ec (rohs) & 2011/6 5/eu (rohs 2) compliant. 2. see http://www.diodes.com/quality/lead_free.html for more in formation about diodes incorporated?s definitions of halogen- a nd antimony-free, "green" and lead-free. 3. halogen- and antimony-free "green? products are defin ed as those which contain <900ppm bromine, <900ppm chlorine (<1500ppm total br + cl) and <1000ppm antimony compounds. pin assignments n package r package r package (sot-23) (sot-89 option 1) (sot-89 option 2) k package z package z package (sot-23-5) (to-92 (bulk packing)) (to-92 (ammo packing )) note : 4. * pin 2 is attached to substrate and must be connected to anode or open. 123 ref cathode anode 1 2 3 ref cathode anode ref cathode anode 1 2 3
as431 document number: ds36599 rev. 3 - 2 2 of 19 www.diodes.com october 2013 ? diodes incorporated a s431 a product line o f diodes incorporated typical applications circuit shunt regulator high current shunt regulator
as431 document number: ds36599 rev. 3 - 2 3 of 19 www.diodes.com october 2013 ? diodes incorporated a s431 a product line o f diodes incorporated typical applications circuit (cont.) current source or current limit precision 5v 1a regulator pwm converter with reference
as431 document number: ds36599 rev. 3 - 2 4 of 19 www.diodes.com october 2013 ? diodes incorporated a s431 a product line o f diodes incorporated functional block diagram absolute maximum ratings (note 5) symbol parameter rating unit v ka cathode voltage 40 v i ka cathode current range (continuous) -100 to 150 ma i ref reference input current range 10 ma p d power dissipation z, r package 770 mw n, k package 370 t j junction temperature +150 c t stg storage temperature range -65 to +150 c esd esd (human body model) 2000 v note 5: stresses greater than those listed under ?absolute maxi mum ratings? may cause permanent damage to the device. these ar e stress ratings only, and functional operation of the devic e at these or any other conditions beyond thos e indicated under ?recommended operating conditi ons? is not implied. exposure to ?absolute maximum ratings? for extended periods may affect device reliability. recommended operating conditions symbol parameter min max unit v ka cathode voltage v ref 36 v i ka cathode current 1.0 100 ma t a operating ambient temperature range -40 +125 c
as431 document number: ds36599 rev. 3 - 2 5 of 19 www.diodes.com october 2013 ? diodes incorporated a s431 a product line o f diodes incorporated electrical characteristics (operating conditions: t a = +25c, unless otherwise specified.) symbol parameter test circuit conditions min typ max unit v ref reference voltage 0.5% 4 v ka = v ref , i ka = 10ma 2.487 2.500 2.512 v 1.0% 2.475 2.500 2.525 ? v ref deviation of reference voltage over full temperature range 4 v ka = v ref , i ka = 10ma 0 to +70c ? 4.5 8 mv -40 to +85c ? 4.5 10 -40 to +125c ? 4.5 16 ? v ref ? v ka ratio of change in reference voltage to the change in cathode voltage 5 i ka = 10ma ? v ka = 10v to v ref ? -1.0 -2.7 mv/v ? v ka = 36v to 10v ? -0.5 -2.0 i ref reference current 5 i ka = 10ma, r1 = 10k ? , r2 = ? 0.7 4 a ? i ref deviation of reference current over full temperature range 5 i ka = 10ma, r1 = 10k ? , r2 = , t a = -40 to +125c ? 0.4 1.2 a i ka (min) minimum cathode current for regulation 4 v ka = v ref ? 0.4 1.0 ma i ka (off) off-state cathode current 6 v ka = 36v, v ref = 0 ? 0.05 1.0 a z ka dynamic impedance 4 v ka = v ref , i ka = 1 to 100ma, f 1.0khz ? 0.15 0.5 ? jc thermal resistance ? sot-23 ? 135.9 ? c/w sot-23-5 ? 135.9 ? to-92 ? 81.9 ? sot-89 ? 29.8 ?
as431 document number: ds36599 rev. 3 - 2 6 of 19 www.diodes.com october 2013 ? diodes incorporated a s431 a product line o f diodes incorporated electrical characteristics (cont.) test circuit 4 for v ka = v ref test circuit 5 for v ka > v ref test circuit 6 for i off
as431 document number: ds36599 rev. 3 - 2 7 of 19 www.diodes.com october 2013 ? diodes incorporated a s431 a product line o f diodes incorporated performance characteristics reference voltage vs. ambient temperature reference current vs. ambient temperature cathode current vs. cathode voltage cathode current vs. cathode voltage off-state cathode current ratio of delta reference voltage to the vs. ambient temperature ratio of del ta cathode voltage -60 -40 -20 0 20 40 60 80 100 120 140 2.485 2.490 2.495 2.500 2.505 2.510 reference voltage (v) ambient temperature ( o c) v ka = v ref i ka = 10ma -60 -40 -20 0 20 40 60 80 100 120 140 0.0 0.5 1.0 1.5 r 1 =10k,r 2 =infinite i ka =10ma reference current ( ? a) ambient temperature ( 0 c) -2 -1 0 1 2 3 -100 -50 0 50 100 150 cathode current (ma) cathode voltage (v) v ka =v ref t a =25 0 c -1.0 -0.5 0.0 0.5 1.0 1.5 2.0 2.5 -200 0 200 400 600 800 cathode current ( ? a) cathode voltage (v) v ka =v ref t a =25 0 c -40-20 0 20406080100120 0.0 0.2 0.4 0.6 0.8 1.0 1.2 1.4 1.6 1.8 2.0 off-state cathode current ( ? a) ambient temperature ( o c) v ka =36v v ref =0 -40 -20 0 20 40 60 80 100 120 -1.4 -1.3 -1.2 -1.1 -1.0 -0.9 v ka =3.5v to 36v ? v ref / ? v ka (mv/v) ambient temperature ( o c)
as431 document number: ds36599 rev. 3 - 2 8 of 19 www.diodes.com october 2013 ? diodes incorporated a s431 a product line o f diodes incorporated performance characteristics (cont.) small signal voltage gain vs. frequency reference impedance vs. frequency stability boundary conditi ons vs. load capacitance 1k 10k 100k 1m -10 0 10 20 30 40 50 60 70 voltage gain (db) small signal frequency (hz) t a =25 0 c i ka =10ma 1k 10k 100k 1,000k 0.1 1 10 reference impedance ( ? ) frequency (hz) i ka =10ma t a =25 o c 0 10 20 30 40 50 60 70 80 90 100 10 1 0.1 0.01 0.001 stable stable cathode current (ma) load capacitance ( ? f) t a =25 o c v ka =v ref v ka = 5v:no oscillation v ka =10v:no oscillation v ka =15v:no oscillation
as431 document number: ds36599 rev. 3 - 2 9 of 19 www.diodes.com october 2013 ? diodes incorporated a s431 a product line o f diodes incorporated performance characteristics (cont.) pulse response of input and output voltage 0246 0 1 2 3 4 5 input input and output voltage (v) time ( ? s) output
as431 document number: ds36599 rev. 3 - 2 10 of 19 www.diodes.com october 2013 ? diodes incorporated a s431 a product line o f diodes incorporated ordering information as431 - circuit type package temperature range voltage tolerance part number marking id packing type lead free green lead free green sot-23 -40 to +125c 0.5% as431antr-e1 as431antr-g1 eb5 gb5 tape & reel 1.0% as431bntr-e1 as431bntr-g1 eb6 gb6 tape & reel sot-23-5 -40 to +125c 0.5% as431aktr-e1 as431aktr-g1 e6h g6h tape & reel 1.0% as431bktr-e1 as431bktr-g1 e6i g6i tape & reel to-92 -40 to +125c 0.5% as431az-e1 as431az-g1 as431az-e1 as431az-g1 bulk 0.5% as431aztr-e1 as431aztr-g1 as431az-e1 as431az-g1 ammo 1.0% as431bz-e1 as431bz-g1 as431bz-e1 as431bz-g1 bulk 1.0% as431bztr-e1 as431bztr-g1 as431bz-e1 as431bz-g1 ammo sot-89 -40 to +125c 0.5% as431artr-e1 AS431ARTR-G1 e43g g43g tape & reel 1.0% as431brtr-e1 as431brtr-g1 e43h g43h tape & reel bcd semiconductor's pb-free products, as des ignated with "e1" suffix in the part number , are rohs compliant. products with "g1" suffix are available in green packages. e1: lead free g1: green tr: tape & reel or ammo blank: bulk package n: sot-23 k: sot-23-5 r: sot-89 z: to-92 voltage tolerance a: 0.5% b: 1.0% pb lead-free pb lead-free pb lead-free pb lead-free
as431 document number: ds36599 rev. 3 - 2 11 of 19 www.diodes.com october 2013 ? diodes incorporated a s431 a product line o f diodes incorporated package outline dimensions (all dimensions in mm(inch).) to-92 (bulk packing) ? 2 .42 0( 0.0 95) 2 .66 0( 0.1 05) 0.3 60( 0. 014) 0.7 60( 0. 030) f 1. 600(0. 0 63) max 12 .5 0 0( 0 .4 9 2 ) 15 .5 0 0( 0 .6 1 0 ) 1.27 0(0. 05 0) ty p 3.300(0 .13 0) 3.700(0 .14 6) 4. 3 0 0 ( 0 . 16 9 ) 4. 7 0 0 ( 0 . 18 5 ) 1.000(0.039) 1.40 0( 0. 0 55) 4.40 0( 0. 1 73) 4.80 0( 0. 1 89) 3.4 30(0. 13 5) mi n 0.3 20(0. 013) 0.5 10(0. 020) 0. 00 0( 0. 0 00) 0. 38 0( 0. 0 15)
as431 document number: ds36599 rev. 3 - 2 12 of 19 www.diodes.com october 2013 ? diodes incorporated a s431 a product line o f diodes incorporated package outline dimensions (cont. all dimensions in mm(inch).) to-92 (ammo packing) 4.300(0.169) 4.700(0.185) 1 2. 500(0. 492) 1 4. 500(0. 571) 2.540(0. 100 ) ty p 1. 270(0.050) ty p 0. (0.015) 0.550(0. 022) 4.400(0. 173 ) 4.800 ( 0.189 ) 3.430(0.135) min 0.320(0. 013 ) 0. 510 ( 0. 020 ) 0. 000(0.000 ) 0.380(0.015) max 1. 100(0. 043 1.400(0. 055 ) 3.300(0.130) 3.800(0.150) 1. 600(0. 063) ) 380 2.500(0. 098 ) 4.000 ( 0.157 ) 13.000(0. 512 ) 15. 000 ( 0. 591 )
as431 document number: ds36599 rev. 3 - 2 13 of 19 www.diodes.com october 2013 ? diodes incorporated a s431 a product line o f diodes incorporated package outline dimensions (cont. all dimensions in mm(inch).) sot-23 2.300(0.091) 2.500(0.098) 1.200(0.047) 1.400(0.055) 0.890(0.035) 1.030(0.041) 0.300(0.012) 0.510(0.020) 1.900(0.075)ref 2.800(0.110) 3.000(0.118) 2.0 3.0 0.500(0.020) 0.700(0.028) 1.050(0.041)ref 0.010(0.0004) 0.100(0.004) 0.900(0.035) 1.100(0.043) 4 r0.100(0.004) 7. 0 7.0 0.550(0.022)ref 0. 200(0. 008)min 0.100(0.004) gauge plane 0.080(0.003) 0.180(0.007) r0.100(0.004) 0. 0~10.0
as431 document number: ds36599 rev. 3 - 2 14 of 19 www.diodes.com october 2013 ? diodes incorporated a s431 a product line o f diodes incorporated package outline dimensions (cont. all dimensions in mm(inch).) sot-23-5 2.820(0.111) 2 . 6 5 0 ( 0 . 1 0 4 ) 1 . 5 0 0 ( 0 . 0 5 9 ) 0 . 0 0 0 ( 0 . 0 0 0 ) 0.300(0.012) 0.950(0.037) 0 . 9 0 0 ( 0 . 0 3 5 ) 0.100(0.004) 0.200(0.008) 0 . 3 0 0 ( 0 . 0 1 2 ) 8 0 3.100(0.122) 1 . 7 0 0 ( 0 . 0 6 7 ) 3 . 0 0 0 ( 0 . 1 1 8 ) 0.500(0.020) 0 . 1 5 0 ( 0 . 0 0 6 ) 1 . 3 0 0 ( 0 . 0 5 1 ) 0.200(0.008) 0 . 6 0 0 ( 0 . 0 2 4 ) 1.800(0.071) 2.000(0.079) 0 . 7 0 0 ( 0 . 0 2 8 ) r e f t y p 1 . 4 5 0 ( 0 . 0 5 7 ) m a x
as431 document number: ds36599 rev. 3 - 2 15 of 19 www.diodes.com october 2013 ? diodes incorporated a s431 a product line o f diodes incorporated package outline dimensions (cont. all dimensions in mm(inch).) sot-89 45 1.550(0.061)ref 4.400(0.173) 4. 600(0.181) 0.900(0.035) 1.200(0.047) 3. 950(0. 156) 4. 250(0. 167) 3.000(0.118) typ 0. 480(0. 019) 2.300(0.091) 2.600(0.102) 0.320(0.013) 0.540(0.021) 3 10 2. 060(0. 081)ref 1.400(0.055) 1.600(0.063) 0.350(0.014) 0.450(0.018) r0.150(0.006) 3 10 1.500(0.059) 0.320(0.013)ref 1.620(0.064)ref 2.210(0.087)ref 0.320(0.013) 0.540(0.021) 1.800(0.071) option 1 option 2 0.620(0.024) 1.030(0.041)ref r 0.200(0.008) 1.620(0.064) 1. 830(0. 072) 2.630(0.104) 2.930(0.115) option 1
as431 document number: ds36599 rev. 3 - 2 16 of 19 www.diodes.com october 2013 ? diodes incorporated a s431 a product line o f diodes incorporated suggested pad layout sot-23 y g z y xe grid placement courtyard dimensions z (mm)/(inch) g (mm)/(inch) x (mm)/(inch) y (mm)/(inch) e (mm)/(inch) value 2.900/0.114 1.100/0.043 0.800/0.031 0.900/0.035 0.950/0.037
as431 document number: ds36599 rev. 3 - 2 17 of 19 www.diodes.com october 2013 ? diodes incorporated a s431 a product line o f diodes incorporated suggested pad layout (cont.) sot-23-5 e2 e1 y x g z dimensions z (mm)/(inch) g (mm)/(inch) x (mm)/(inch) y (mm)/(inch) e1 (mm)/(inch) e2 (mm)/(inch) value 3.600/0.142 1.600/0.063 0.700/0.028 1.000/0.039 0.950/0.037 1.900/0.075
as431 document number: ds36599 rev. 3 - 2 18 of 19 www.diodes.com october 2013 ? diodes incorporated a s431 a product line o f diodes incorporated suggested pad layout (cont.) sot-89 dimensions z (mm)/(inch) x (mm)/(inch) x1 (mm)/(inch) x2 (mm)/(inch) y (mm)/(inch) y1 (mm)/(inch) e (mm)/(inch) value 4.600/0.181 0.550/0.022 1.850/0.073 0.800/0.031 1.300/0.051 1.475/0.058 1.500/0.059 ? x1 x2 y1 e x y z
as431 document number: ds36599 rev. 3 - 2 19 of 19 www.diodes.com october 2013 ? diodes incorporated a s431 a product line o f diodes incorporated important notice diodes incorporated makes no warranty of any kind, express or implied, with regards to this document, including, but not limited to, the im plied warranties of merchantability and fitness for a particular purpose (and their equivalents under the la ws of any jurisdiction). diodes incorporated and its subsidiaries rese rve the right to make modifications, enhanc ements, improvements, corrections or ot her changes without further notice to this document and any product descri bed herein. diodes incorporated does not assume any liability ari sing out of the application or use of this document or any product described herein; neither does diodes inco rporated convey any license under its patent or trademark rights, nor the rights of others. any customer or user of this document or products described herein in such applica tions shall assume all risks of such use and will agree to hold diodes incorporated and all the companies whose products are represented on diodes incorporated website, harmless against all damages. diodes incorporated does not warrant or accept any liability w hatsoever in respect of any products purchased through unauthoriz ed sales channel. should customers purchase or use diodes inco rporated products for any unintended or una uthorized application, customers shall i ndemnify and hold diodes incorporated and its representativ es harmless against all claims, damages, expenses, and attorney fees arising out of, directly or indirectly, any claim of personal injury or death a ssociated with such unintended or unauthorized application. products described herein may be covered by one or more united states, international or foreign patents pending. product names and markings noted herein may also be covered by one or more un ited states, international or foreign trademarks. this document is written in english but may be translated into multiple languages for reference. only the english version of t his document is the final and determinative format released by diodes incorporated. life support diodes incorporated products are specifically not authorized for use as critical com ponents in life support devices or systems without the express written approval of the chief executive offi cer of diodes incorporated. as used herein: a. life support devices or syst ems are devices or systems which: 1. are intended to implant into the body, or 2. support or sustain life and whose failure to perform when proper ly used in accordance with instructions for use provided in the labeling can be reasonably expected to result in significant injury to the user. b. a critical component is any component in a life support devic e or system whose failure to perform can be reasonably expect ed to cause the failure of the life support device or to affect its safety or effectiveness. customers represent that they have all necessary expertise in the safety and regulatory ramifi cations of their life support dev ices or systems, and acknowledge and agree that they are solely responsible for all legal, regulatory and safety-rel ated requirements concerning the ir products and any use of diodes incorporated products in such safety-critical, life support devices or systems, notwithstanding any devices- or s ystems-related information or support that may be provided by diodes incorporated. further, customers must fully indemnify diodes incorporate d and its representatives against any damages arisi ng out of the use of diodes incorporated pr oducts in such safety-critical, life suppor t devices or systems. copyright ? 2013, diodes incorporated www.diodes.com

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