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ksd-i0a013-006 1 sn431/snf431 programmable voltage reference ? description the sn431 series are 3-terminal precision shunt regulators that are programmable over a wide voltage range of 2.495v to 36v with 0.5%, 1.0% tolerance. th e sn431 series have a low dynamic impedance of 0.15 ? . these features make the sn431 series an excellent replacement fo r zener diodes in numerous applications circuits that require a precision reference voltage. ? features ? programmable output voltage from 2.495v to 36v ? voltage reference tole rance : 0.5%, 1.0% ? cathode current capability of 1ma to 100ma [ k : cathode, a: anode, r : reference ] pkg : sot-89 apply device : sn431xf r ? pin assignment pkg : sot-23 apply device : sn431xs pkg : sot-23 apply device : snf431xs pkg : sot-25 apply device : sn431xn pkg : to-92 apply device : sn431x ak a k r a r k a r a k nc nc k ra k ra pkg : to-92m apply device : sn431xm (marking side view) (top view) (top view) (top view) (top view) (marking side view)
ksd-i0a013-006 2 sn431/snf431 vref tolerance pkg type device name marking to-92 SN431A sn431 a to-92m SN431Am sn431 a sot-23 SN431As 1) 4ga 3) sot-23 snf431as 2) 4ka 3) sot-25 SN431An n4a 3) 1% sot-89 SN431Af SN431A to-92 sn431b sn431 b to-92m sn431bm sn431b sot-23 sn431bs 1) 4gb 3) sot-23 snf431bs 2) 4kb 3) sot-25 sn431bn n4b 3) 0.5% sot-89 sn431bf sn431b 1) sn431x pin connection : 1. cathode, 2. reference, 3. anode 2) snf431x pin connection : 1. reference, 2. cathode, 3. anode 3) : year & week code ? symbol ? functional block diagram ? ordering information cathode(k) anode(a) reference(r) reference(r) v ref =2.495v cathode(k) anode(a) + ?
ksd-i0a013-006 3 sn431/snf431 ? absolute maximum ratings [ta=25 ] characteristic symbol rating unit cathode to anode voltage v ka 37 v cathode current i k 150 ma reference input current i ref 10 ma sot-23 p d (note1) 350 sot-25 p d (note1) 400 sot-89 p d (note1) 500 to-92 p d (note2) 625 power dissipation to-92m p d (note2) 400 mw junction temperature t j 150 operating temperature range t opr -40 ~ +85 storage temperature range t stg -55 ~ +150 note 1 : mounted on a glass epoxy pcb board (25.4 25.4mm).t a =25 note 2 : t a =25 ? recommended operating conditions rating characteristic symbol min. max. unit cathode to anode voltage v ka v ref 36 v cathode current i k 1 100 ma ? electrical characteristics (ta=25 , unless otherwise noted.) characteristic symbol condition min. typ. max. unit sn431b 2.482 2.508 reference voltage (fig.1) v ref v ka =v ref , i k =10ma SN431A 2.470 2.495 2.520 v reference input voltage deviation over temperature (fig.1, note1,2) v ref v ka =v ref , i k =10ma @ -40 ? c ta 85 ? c - 7 30 mv v ref ratio of delta reference input voltage to delta cathode voltage (fig.2) v ka i k =10ma v ref v ka 36v - -1.0 -2.7 mv/v reference current (fig.2) i ref i k =10ma, r1=10k , r2= - 1.8 4.0 ? reference input current deviation over temperature (fig.2, note 1,2) i ref i k =10ma, r1=10k , r2= @ -40 ? c ta 85 ? c - 0.4 2.5 ? minimum cathode current for regulation i k(min) v ka =v ref - 0.35 1.0 m off-state cathode current (fig.3) i k(off) v ka =36v, v ref =0v - 2.7 1000 na dynamic impedance (fig.1, note3) z ka v ka =v ref , f 1.0khz 1.0ma i k 100ma - 0.15 0.5
ksd-i0a013-006 4 sn431/snf431 1 2 1 ) 1 ( r i r r ref ref ka v v + + = note. 1. ambient temperature range: t low = -40 , t high = 85 2. the deviation parameters v ref and i ref are defined as the difference betwee n the maximum value and minimum value obtained over the full operating ambient temperature range that applied. the average temperature coefficien t of the reference input voltage, ref v is defined as: t ) 10 ) 25 = t ( v v ( = ) ppm ( v a 6 a ref ref ref example : v ref = 30mv and the slope is positive, v ref @ 25 = 2.495v ta = 70 3. the dynamic impedance z ka is defined as: k ka ka i v = when the device is operating with two external resistors, r1 and r2, (refer to fig.2) the total dynamic impedance of the circui t is given by: ) r r + 1 ( = 2 1 ka ' ka fig. 1 test circuit for v ka =v ref fig. 2 test circuit for v ka >v ref fig. 3 test circuit for i k(off) ka input r1 r2 v i k(off) i ref v ref i k ka v input i k ? v ref = v ref max ? v ref min ? ta = t 2 ? t 1 ambient temperature ka v input / ppm 171 = 70 10 ) 495 . 2 03 . 0 ( = ) ppm ( v 6 ref
ksd-i0a013-006 5 sn431/snf431 ? electrical characteristic curves -25 -20 -15 -10 -5 0 0 4 8 1216202428323640 0.0 0.5 1.0 1.5 2.0 2.5 3.0 3.5 4.0 -60 -40 -20 0 20 40 60 80 100 -200 -100 0 100 200 300 400 500 600 700 800 -10123 -150 -125 -100 -75 -50 -25 0 25 50 75 100 125 150 -2 -1 0 1 2 3 -1.0 -0.8 -0.6 -0.4 -0.2 0.0 0.2 0.4 0.6 0.8 1.0 -60 -40 -20 0 20 40 60 80 100 0.0 0.5 1.0 1.5 2.0 2.5 3.0 3.5 4.0 4.5 5.0 -60 -40 -20 0 20 40 60 80 100 fig.4 v ref vs t a reference voltage change - v ref [%] ambient temperature - t a [ ] reference input current - i ref [ a] ambient temperature - t a [ ] fig.5 i ref vs t a fig.6 i ka vs v ka cathode current - i ka [ma] cathode voltage - v ka [ v] fig.7 i ka vs v ka cathode voltage - v ka [ v] fig.8 i off vs t a off-state cathode current - i off [na] ambient temperature - t a [ ] fig.9 v ref vs v ka cathode voltage - v ka [ v] cathode current - i ka [ a] delta reference voltage - v ref [ mv ] v ka =v ref i k =10ma i k =10ma r1=10k ? r2= v ka =v ref t a =25 v ka =v ref t a =25 v ka = 36v v ref =0v i k =10ma t a =25
ksd-i0a013-006 6 sn431/snf431 220 ? 10 f i k 10k ? 10k ? output gnd voltage gain test circuit 500 ? i k vout gnd rs=100 ? vin z ka = vout/vin x rs dynamic impedance test circuit 1uf ? electrical characteristic curves fig.10 a v vs f voltage gain - a v [db] frequency - f [ hz] fig.11 |z ka | vs f reference impedance ? |z ka | [ ? ] frequency - f [ hz] 0 10 20 30 40 50 60 1k 10k 100k 1000k 10000k i k =10ma t a =25 0.1 1 10 100 1k 10k 100k 1000k 10000k i k =10ma t a =25
ksd-i0a013-006 7 sn431/snf431 fig.12 pulse response voltage swing [v] time [ s] output pulse generator f = 100khz gnd 220 ? 50 ? pulse response test circuit input output 0.9v/div 5v/div
ksd-i0a013-006 8 sn431/snf431 ? typical application vout vcc fig14. shunt regulator ( ) vref r r vout 2 1 1 + = r1 r2 vcc vout vin vth=vref vin < vref -> vout=vcc vin > vref -> vout P 2.0v fig15. single-supply comparator with temperature-compensated threshold isink vcc rs isink = vref / r s fig16. constant current sink vcc r cl iout = vref / r cl iout fig17. constant current source vout vcc ( ) vref r r vout 2 1 1 + = r1 r2 fig18. series pass regulator vin(min) = vout + vbe vout(min) = vref + vbe vout vcc fig19. high currnet shunt regulator ( ) vref r r vout 2 1 1 + = r1 r2
ksd-i0a013-006 9 sn431/snf431 ? sot-89 outline dimension (unit : mm) recommend pcb solder land [unit: mm]
ksd-i0a013-006 10 sn431/snf431 ? sot-23 outline dimension (unit : mm) recommend pcb solder land [unit: mm]
ksd-i0a013-006 11 sn431/snf431 ? sot-25 outline dimension (unit : mm) recommend pcb solder land [unit: mm]
ksd-i0a013-006 12 sn431/snf431 ? to-92 outline dimension (unit : mm)
ksd-i0a013-006 13 sn431/snf431 ? to-92m outline dimension (unit : mm)
ksd-i0a013-006 14 sn431/snf431 the auk corp. products are intended for the use as components in general electronic equipment (office and co mmunication equipment, m easuring equipment, home appliance, etc.). please make sure that you consult with us before you use these auk corp. products in equipments which require high quality and / or reliability, and in equipments which could have major impact to th e welfare of human life(atomi c energy control, airplane, spaceship, transportation, co mbustion control, all types of safety device, etc.). auk corp. cannot accept liability to any damage which may occur in case these auk corp. products were used in the mentioned equi pments without prior consultation with auk corp.. specifications mentioned in this publicati on are subject to change without notice.

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