z ht431 document number: ds 32157 rev. 12 - 2 1 of 9 www.diodes.com april 2018 ? diodes incorporated zht431 adjustable precision zener shunt regulator description the zht431 is a three terminal adjustable shunt regulator offering excellent temperature stability and output current handling capability up to 100ma. the device offers extended operati ng temperature range working from - 55 to +125c. the output voltage may be set to any chosen voltage between 2.5 and 20 volts by selection of two external divider resistors. the devices can be used as a replacement for zener diodes in many applications r equiring an improvement in zener performance. features ? surface m ount sot23 (type dn) p ackage ? 0.5%, 1% and 2% t olerance ? maximum t emperature c oefficient 67ppm/c ? temperature c ompensated for o peration o ver the f ull t emperature r ange ? programmable o utput v olta ge ? 50 a to 100ma c urrent s ink c apability ? low o utput n oise ? wide t emperature r ange - 55 to +125c ? totally lead - free & fully rohs compliant (notes 1 & 2) ? halogen and antimony free. green device (note 3) pin assignments applications ? series and s hunt r egulator ? voltage mo nitor ? over v oltage / u nder v oltage p rotection ? switch m ode p ower s upplies notes: 1. no purposely added lead. fully eu directive 2002/95/ec (rohs), 2011/65/eu (rohs 2) & 2015/863/eu (rohs 3) compliant. 2. see https://www.diodes. com/quality/lead - free/ for more information about diodes incorporateds definitions of halogen - and antimony - free, "green" and lead - free. 3. halogen, antimony and beryllium - free "green products are defined as those which contain <900ppm bromine, <900ppm chlorine (<1500ppm total br + cl), <1000ppm antimony compounds and <1000ppm beryllium. typical application circuit (top view) sot23 (type dn) v ref gnd v z g n d v z v r e f ( t o p v i e w ) s o t 2 3
z ht431 document number: ds 32157 rev. 12 - 2 2 of 9 www.diodes.com april 2018 ? diodes incorporated zht431 absolute maximum ratings (voltages to gnd unless otherwise stated . ) parameter rating unit cathode voltage (v z ) 20 v cathode current 150 ma operating temperature - 55 to + 125 c storage temperature - 55 to + 150 c power dissipation (t a = + 25c, t jmax = + 150c) 330 mw recommended operating conditions parameter min max unit cathode voltage v ref elect rical characteristics (test conditions unless otherwise specified: t a = + 25c . ) symbol v parameter values unit conditions min. typ. max. v ref reference voltage 2% 1% 0.5% 2.45 2.475 2.4875 2.50 2.50 2.50 2.55 2.525 2.5125 v i l = 10ma (fig . 1), v z = v ref v dev deviation of r eference i nput v oltage o ver t emperature l = 10ma , v z = v ref t a = f ull r ange (fig . 1) v ref v z ratio of the c hange in r eference v oltage to the change in cathode voltage z from v ref to 10v i z = 10ma (fig.2) z from 10v to 20v i z = 10ma (fig.2) i ref reference i nput c urrent l = 10ma (fig.2) i ref deviation of r eference i nput c urrent o ver t emperature l =10ma , t a = f ull r ange (fig.2) i z min minimum c athode c urrent for r egulation z = v ref (fig.1) i z off off - state c urrent z = 20v, v ref = 0v (fig.3) r z dynamic o utput i mpedance z = v ref (fig.1), f = 0hz, i c = 1ma to 100ma deviation of reference input voltage, v dev , is defined as the maximum variation of the reference input voltage over the full temperature range. the average temperature coefficient of the reference input voltage, v ref is defined as: the dynamic output impedance, r z , is defined as: when the device is programmed with two external resistors, r1 and r2, ( f ig . 2), the dynamic output impedance of the overall circuit, r, is defined as:
z ht431 document number: ds 32157 rev. 12 - 2 3 of 9 www.diodes.com april 2018 ? diodes incorporated zht431 typical operating conditions -50 125 -25 100 0 75 25 50 90 100 110 temperature (c) i vs. temperature r ef reference current (na) 120 130 140 150 160 170 0 20 15 5 10 -25 -20 cathode voltage (v) change in v vs. cathode voltage ref change in reference output voltage (mv) -15 -10 -5 0 i = 10ma z -50 125 -25 100 0 75 25 50 24 26 28 32 30 34 36 38 40 temperature (c) i vs. temperature z min minimum cathode current (a) 100 1k 10k 100k 1m frequency (hz) dynamic impedance vs. frequency 100 10 1.0 0.1 dynamic impedance ( ) ? v = v ref z 1ma 10ma -50 125 -25 100 0 75 25 50 2.502 2.486 2.500 2.488 2.498 2.490 2.492 2.494 2.496 temperature ( c) v vs. temperature ref reference voltage (v) 0 150 25 125 50 100 75 0 0.1 0.2 0.3 0.4 0.5 ambient temperature (c) power dissipation derating power dissipation (w)
z ht431 document number: ds 32157 rev. 12 - 2 4 of 9 www.diodes.com april 2018 ? diodes incorporated zht431 typical operating conditions (cont.) v ref < v z < 20v g a i n v f r e q u e n c y f r e q u e n c y ( h z ) l o a d c a p a c i t a n c e ( f ) s t a b i l i t y b o u n d a r y c o n d i t i o n s t i m e ( s ) p u l s e r e s p o n s e i z 1 5 k v z v z t e s t c i r c u i t f o r o p e n l o o p v o l t a g e g a i n 8 k 2 5 9 f 2 3 0 + - i z = 1 0 m a , t a = 2 5 c t e s t c i r c u i t f o r s t a b i l i t y b o u n d a r y c o n d i t i o n s i n p u t 1 5 0 1 0 k v r e f < v z < 2 0 , i z = 1 0 m a , t a = 2 5 c v z i z i n p u t m o n i t o r t e s t c i r c u i t f o r p u l s e r e s p o n s e 2 2 0 5 0 p u l s e g e n e r a t o r t a = 2 5 c 6 0 4 0 2 0 0 1 0 0 1 k 1 0 k 1 0 0 k 1 m ) b d ( n i a g e g a t l o v p o o l n e p o ) v ( g n i w s e g a t l o v 2 . 0 0 0 0 . 4 0 . 6 0 . 8 1 . 0 0 . 2 1 . 0 0 5 . 0 3 . 0 r e p e t i t i v e p u l s e s i n g l e p u l s e v z i n p u t s t a b l e s t a b l e 0 1 0 p 2 0 4 0 6 0 8 0 1 0 0 1 0 0 p 1 0 0 0 p 0 . 0 1 0 . 1 1 ) a m ( t n e r r u c e d o h t a c
z ht431 document number: ds 32157 rev. 12 - 2 5 of 9 www.diodes.com april 2018 ? diodes incorporated zht431 dc test circuits i n p u t i n p u t i n p u t f i g 1 - t e s t c i r c u i t f o r v z = v r e f f i g 2 - t e s t c i r c u i t f o r v z > v r e f f i g 3 - t e s t c i r c u i t f o r o f f s t a t e c u r r e n t ? v z i z i z i r e f i r e f v r e f v r e f r 1 r 2 i l i l i z o f f v z v z
z ht431 document number: ds 32157 rev. 12 - 2 6 of 9 www.diodes.com april 2018 ? diodes incorporated zht431 application circuits r 2 v o u t = 1 + r 1 r 2 v r e f v + v o u t r 1 3 0 0 . 0 1 f v r e f v o u t = 1 + r 1 r 2 v r e f v o u t = v r e f + v r e g m i n r 2 r 1 + v o u t v r e f z s r * * * i n o u t c o m m o n r 2 r 1 v + v o u t v o u t = v r e f 1 + r 1 r 2 v r e f v + o u t p u t i n p u t v = 2 . 5 v t h v 2 v o n v = v + o f f r 2 a r 1 a v + v r e f r 2 b r 1 b v r e f 1 + r 1 b r 2 b v r e f l o w l i m i t = h i g h l i m i t = 1 + r 1 a r 2 a v r e f r 2 r 1 v o u t = v r e f 1 + r 1 r 2 v r e f v + v o u t o u t p u t h i g h e r c u r r e n t s h u n t r e g u l a t o r s h u n t r e g u l a t o r s e r i e s r e g u l a t o r o u t p u t c o n t r o l o f a t h r e e t e r m i n a l f i x e d r e g u l a t o r s i n g l e s u p p l y c o m p a r a t o r w i t h t e m p e r a t u r e c o m p e n s a t e d t h r e s h o l d o v e r v o l t a g e / u n d e r v o l t a g e p r o t e c t i o n c i r c u i t
z ht431 document number: ds 32157 rev. 12 - 2 7 of 9 www.diodes.com april 2018 ? diodes incorporated zht431 ordering information part number tolerance (%) package (note 5) part mark reel size (inches) quantity per reel tape width status (note 4) zht431f01ta 1 sot23 (type dn) 43c 7 3000 8mm in p roduction zht431f01 - 7 1 sot23 (type dn) 43c 7 3000 8mm end of l ife zht431 fmta 0.5 sot23 (type dn) 43p 7 3000 8mm in p roduction zht431f02ta 2 sot23 (type dn) 43d 7 3000 8mm in p roduction notes : 4. zht431f01 - 7 is end of life without any alternative. 5. for packaging details, go to our website at: https://www .diodes.com/design/support/packaging/diodes - packaging/ . marking information sot23 (type dn) (top view) xxx : part mark z h t 4 3 1 x x x p a c k i n g p a c k a g e f : s o t 2 3 ( t y p e d n ) t o l e r a n c e 0 1 : 1 . 0 % t a : 7 " t a p e & r e e l m : 0 . 5 % 0 2 : 2 %
z ht431 document number: ds 32157 rev. 12 - 2 8 of 9 www.diodes.com april 2018 ? diodes incorporated zht431 package outline dimensions please see http://www.diodes.com/package - outlines.html for latest version. (1) package type: sot23 (type dn) suggested pad layout please see http://www.diodes.com/package - outlines.html for latest version. (1) package type: sot23 (type dn) sot23 (type dn) dim min max typ a 0.89 1.12 1.00 a1 0.01 0.10 0.05 b 0.30 0.51 0.45 c 0.08 0.20 0.10 d 2.80 3.04 3.00 e 2.10 2.64 2.42 e1 1.20 1.40 1.37 e 0.95 ref e1 1.90 ref l 0.25 0.60 0.30 l1 0.45 0.6 2 0.54 all dimensions in mm dimensions value (in mm) c 2.0 x 0.8 x1 1.35 y 0.9 y1 2.9 e a1 c l d a b e e1 e1 l x y y1 c x1
z ht431 document number: ds 32157 rev. 12 - 2 9 of 9 www.diodes.com april 2018 ? diodes incorporated zht431 important notice diodes incorporated makes no warranty of any kind, express or implied, with regards to this document, including, but not limited to, the implied warranties of merchantability and fitness for a particular purpose (and their equivalents under the law s of any jurisdiction). diodes incorporated and its subsidiaries reserve the right to make modifications, enhancements, improvements, corrections or other changes without further notice to this document and any product described herein. diodes incorpora ted does not assume any liability arising out of the application or use of this document or any product described herein; neither does diodes incorporated convey any license unde r its patent or trademark rights, nor the rights of others. any customer or us er of this document or products described herein in such applications shall assume all risks of such use and will agree to hold diodes incorporated and all the companies whose products are represented on diod es incorporated website, harmless against all da mages. diodes incorporated does not warrant or accept any liability whatsoever in respect of any products purchased through unauthor ized sales channel. should customers purchase or use diodes incorporated products for any unintended or unauthorized appl ication, customers shall indemnify and hold diodes incorporated and its representatives harmless against all claims, damages, expenses, and attorney fees arising ou t of, directly or indirectly, any claim of personal injury or death associated with such uni ntended or unauthorized application. products described herein may be covered by one or more united states, international or foreign patents pending. product name s and markings noted herein may also be covered by one or more united states, international o r foreign trademarks. this document is written in english but may be translated into multiple languages for reference. only the english version of this document is the final and determinative format released by diodes incorporated. life support diodes i ncorporated products are specifically not authorized for use as critical components in life support devices or systems withou t the express written approval of the chief executive officer of diodes incorporated. as used herein: a. life support devices or systems 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 properly used in accordance with instructions for use provided i n the labeling can be reasonably expec ted to result in significant injury to the user. b. a critical component is any component in a life support device or system whose failure to perform can be reasonably expe cted to cause the failure of the life support device or to affect its saf ety or effectiveness. customers represent that they have all necessary expertise in the safety and regulatory ramifications of their life support d evices or systems, and acknowledge and agree that they are solely responsible for all legal, regulatory and safety - related requirements concerning their products and any use of diodes incorporated products in such safety - critical, life support devices or systems, notwithstanding any devices - or systems - related information or support that may be provided by diodes incorporated. further, customers must fully indemni fy diodes incorporated and its representatives against any damages arising out of the use of diodes incorporated products in such safety - critical, life support devices or systems. copyright ? 201 8 , diodes incorporated www.diodes.com
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