a b d e g m l h j top view a b c d e g h j k l m 0.35 1.19 2.10 0.85 0.46 1.70 2.70 0.01 0.89 0.30 0.076 0.51 1.40 3.00 1.05 1.00 2.10 3.10 0.13 1.10 0.61 0.25 k c 1 2 3 programmable precision reference wt431lt1 p b sot-23 outline dimensions 1/5 03-nov-06 dim min max http://www.weitron.com.tw weitron sot-23 unit:mm * the wt431 is a three-terminal adjustable regulat or with a guaranteed thermal stability over applicable temperature ranges. the output voltage may be set to any value between vref(approximately 2.5) and 36v with two external resistors. it provides very wide applications, including shunt regulator, series regulator, switching regulator, voltage reference and others. description: * programmagle output voltage to 36v. * low dynamic output impedance 0.2. * sink current capability of 1 to 100ma. * equivalent full-range temperature coe?cient of 50ppm/c typical for operation over full rated operating temperature range. features: lead(pb)-free
wt431lt1 2/5 03-nov-06 http://www.weitron.com.tw weitron - + cathode block diagram pin assignment wt431r wt431l p in 1 = ref p in 2 = cathode p in 3 = anode 2 3 1 anode ref v ref p in 1 = cathode p in 2 = ref p in 3 = anode 2 3 1 ordering information wt431ra 0.5% 3000 units / tape & reel 3000 units / tape & reel 3000 units / tape & reel 3000 units / tape & reel wt431rb 1% wt431la 0.5% WT431LB 1% ordering number rank shipping
http://www.weitron.com.tw weitron wt431lt1 3/5 03-nov-06 cathode voltage v ka 36 v cathode voltage v ka v ref 36 v cathode current i ka 1 100 - - ma reference input voltage v ref v ka =v ref , i ka =10ma v-2.50- reference input current i ref i ka =10ma, r1=10k a41.5- minimum cathode current for regulation i ka(min) v ka =v ref am1.00.45- off-state cathode current i ka(off) v ka =36v, v ref =0 a1.00.05- dynamic impedance z ka v ka =v ref =0, i ka =1 to 100ma 0.50.15- deviation of reference input voltage over temperature v ref / t i ka =10ma -2.7-1.0 -2.0-0.5 - mv/v ratio of change in reference input voltage to the change in cathode voltage v ref / v ka v ka =v ref , i ka =10ma t min <=t a <=t max 174.5- mv deviation of reference input current over full temperature range i ref / t i ka =10ma, r1=10k t a =full temperature a1.20.4- parameter absolute maximum ratings (operating temperature range applies unless otherwise specified) recommended operating conditions electrical characteristics (t a =25?c unless otherwise specified) classification of v ref and & marking symbol value unit parameter symbol min typ max unit parameter symbol test conditions min typ max unit cathode current range(continuous) i ka -100 ~ +150 ma reference input current range i ref -0.05 ~ +10 ma storage tempe ra ture t stg -65 ~ +150 c opera ting ambient tempera ture t opr 0~70 c opera ting junction tempera ture t j 150 c v ka =10v~v ref v ka =36v~10v <= wt431ra 0.5% 2.487~2.512 ra wt431rb 1% 2.475~2.525 rb wt431la 0.5% 2.487~2.512 la WT431LB 1% 2.475~2.525 lb parameter rank range(v) marking
http://www.weitron.com.tw weitron wt431lt1 4/5 03-nov-06 typical performance characteristics 1 1 3 1 1 1 c c c a t c a re 1 1 3 4 c c c a c c c t c a re i a 1 1 3 3 4 1 1 3 3 4 c c i r n i 3 c r i c i a 1 a t c 1 3 4 1 3 4 t i 4 r t c 1 1 1 1 1 1 1 1 1 1 4 1 3 i d i t c i a a 1 a 1 1 3 4 1 1 1 1 4 1 3 a a t c i a 1 a fig 1 ca thode cu rrent vs ca thode volt age
http://www.weitron.com.tw weitron wt431lt1 5/5 03-nov-06 wt431 linear integrated circuit te t circuit in ut a re i a wt431 r1 r i re a re 1 r1 r i re r1 in ut a re i a in ut a i a wt431 7 t c a re 8 t c a re 9 t c i a a licati n circuit re wt431 r1 r 1 r1 r re re wt431 wt7805 r1 r 1 r1 r re ut in c n re wt431 r1 r 1 r1 r re 1 r 11 c t 1 r t r wt431 r rcl i wt431 r i i re r 13 c 14 c l c re rcl i wt431
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