t4 - lds - 0287 , rev . 1 (1 2 1795 ) ?201 2 microsemi corporation page 1 of 8 1n957b-1 C 1n992b-1 available on commercial versions s ilicon 500 mw z ener d iodes qualified per mil - prf - 19500/11 7 qualified levels * : jan, jantx, and jantxv description the popular 1n957b -1 thr o ugh 1n992b -1 series of 0.5 watt zener voltage r egulators provides a selection from 6.8 to 200 volts in a standard 5% , 2% and 1% tolerance versions . these axial - leaded glass do - 35 zeners feature an internal metallurgical bond and are available in military qualif ied and commercial rohs compliant versions . military qualified versions are available on the 1n962b - 1 through 1n992b - 1 range of part numbers. do - 35 (do - 204ah) package also available in : do - 213aa package ( melf surface mount) 1n9 57 b ur - 1 C 1n992bur -1 important: for the latest information, visit our website http://www.microsemi.com . features ? jedec registered 1n957b to 1n992b number series . ? internal metallurgical bond. ? *j an, jantx, and jantxv qualification s are available per mil - prf - 19500/11 7 for part numbers 1n962b - 1 thru 1n992b -1. ? upscreening is available in reference to mil - prf - 19500 for the range of 1n957b - 1 thr o ugh 1n961b - 1. (see part nomenclature for all available options.) ? rohs c ompliant version s available (commercial grade only). applications / benefits ? regulates voltage over a broad operating current and temperature range . ? extensive selection from 6.8 to 200 v . ? standard v oltage tolerance is 5% with option al tighter tolerances of 2% or 1%. ? flexible axial - lead mounting terminals . ? non - sensitive to esd per mil - std - 750 m ethod 1020 . ? minimal capacitance. ? inherently radiation hard as descri bed in microsemi micronote 050 . maximum ratings msc C law rence 6 lake street, lawrence, ma 01841 tel: 1- 800 - 446 - 1158 or (978) 620 - 2600 fax: (978) 689 - 0803 msc C ireland gort road business park, ennis, co. clare, ireland tel: +353 (0) 65 6840044 fax: +353 (0) 65 6822298 website: www.microsemi.com parameters/test conditions symbol value unit operating and storage temp erature t j and t stg - 65 to +175 oc thermal resistance junction - to - lead @ .375 inch ( 9.53 mm) lead length from body r ? jl 250 oc /w thermal resistance junction - to - ambient when mounted on pc b (1) r ? ja 30 0 oc /w steady - state power dissipation @ t l = + 50c .375 inch ( 9.53 mm) from body (2 ) @ t a = 5 5c mounted on pc b p d 0.5 0.4 w for w ard voltage @ i f = 200 ma 1n9 57 C 1n985 1n98 6 C 1n992 v f 1.1 1.3 v solder temperature @ 10 s t sp 260 o c notes: 1. see figures 1 and 2 for derating curves. t a = +75c on an fr4 pc board with 1 oz copper metaliz ation. 2. b oth ends of case or diode body to heat sink at l = .375 inch (9.53 mm). derate i z to 0.0 ma at +175c . downloaded from: http:///
t4 - lds - 0287 , rev . 1 (1 2 1795 ) ?201 2 microsemi corporation page 2 of 8 1n957b-1 C 1n992b-1 mechanical and packaging ? case: hermetically sealed axial - lead glass do - 35 (do - 204 ah) package . ? terminals: tin - lead (sn/pb) or rohs c ompliant annealed matte -t in plating ( on commercial grade only). s olderable per mil - std - 750, method 2026 . ? marking: part number . ? polarity: cathode indicated by band. diode to be operated with the banded end positive with respect to the opposite end for z ener regulation . ? tape & reel option: standard per eia - 296 (add tr suffix to part number) . consult factory for quantities. ? weight: 0.2 grams ? see p ackage d imensions on last page. part nomenclature 1n957 b-1 C 1n9 61 b-1 only : 1n957 b -1 (e3) jedec type number (s ee electrical characteristics t able ) zener voltage tolerance b = 5% c = 2% d = 1% rohs compliance e3 = rohs c ompliant blank = non - rohs c ompliant meta llurgically bonded 1n962b - 1 C 1n992b - 1 only: jan 1n9 62 b -1 (e3) reliability level jan = jan level jantx = jantx level jantxv = jantxv level blank = commercial jedec type number (s ee electrical chara cteristic s t able ) zener voltage tolerance b = 5% c = 2% d = 1% rohs compliance e3 = rohs c ompliant ( available on commercial grade only ) blank = non - rohs c ompliant metallurgical ly bond ed downloaded from: http:///
t4 - lds - 0287 , rev . 1 (1 2 1795 ) ?201 2 microsemi corporation page 3 of 8 1n957b-1 C 1n992b-1 symbols & definitions symbol definition i r reverse current: the maximum reverse (leakage) current that will flow at the specified vo ltage and temperature. i z , i zt , i zk regulator current: the dc regulator current (i z ), at a specified test point (i zt ), near breakdown knee (i zk ). i zm maximum regulator (zener) current: the maximum rated dc current for the specified power r ating. i zsm maximum zener surge current: the non - repetitive peak value of z ener surge current at a specified wave form. v f maximum forward voltage: the maximum forward voltage the device will exhibit at a specified current. v r reverse voltage: the reverse voltage dc value, no alternating component. v z zener voltage: the z ener voltage the device will exhibit at a specified current (i z ) in its breakdown region. z zt or z zk dynamic im pedance: the small signal impedance of the diode when biased to operate in its breakdown region at a specified rms current modulation (typically 10% of i zt or i zk ) and superimposed on i zt or i zk respectively. downloaded from: http:///
t4 - lds - 0287 , rev . 1 (1 2 1795 ) ?201 2 microsemi corporation page 4 of 8 1n957b-1 C 1n992b-1 electrical characteristics jedec type nu mber (note 1) nominal zener voltage (note 2) v z zener test current i zt maximum zener impedance z zt z z z zk @ i zk maximum dc zener current (note 4) i zm maximum surge current (note 5) i zsm maximum reverse leakage current i r @ v r maximum temperature coefficient vz volts ma o hms o hms a ma ma a v olts %/c 1n957b -1 1n958b -1 1n959b -1 1n960b -1 1n961b -1 6.8 7.5 8.2 9.1 10 18.5 16.5 15.0 14.0 12.5 4.5 5.5 6.5 7.5 8.5 700 700 700 700 700 250 250 250 250 250 55 50 45 41 38 300 275 2 50 225 200 150 75 50 25 10 5.2 5.7 6.2 6.9 7.6 +0.050 +0.058 +0.065 +0.068 +0.075 1n962b -1 1n963b -1 1n964b -1 1n965b -1 1n966b -1 11 12 13 15 16 11.5 10.5 9.5 8.5 7.8 9.5 11.5 13.0 16 17 700 700 700 700 700 250 250 250 250 250 35 32 30 26 25 590 540 500 433 406 1.0 1.0 0. 5 0. 5 0. 5 8.4 9.1 9.9 11 12 +0.073 +0.076 +0.079 +0.082 +0.083 1n967b -1 1n968b -1 1n969b -1 1n970b -1 1n971b -1 18 20 22 24 27 7.0 6.2 5.6 5.2 4.6 21 25 29 33 41 750 750 750 750 750 250 250 250 250 250 21 19 17 16 14 361 325 295 271 240 0. 5 0. 5 0. 5 0. 5 0. 5 14 15 17 18 21 +0.085 +0.086 +0.087 +0.088 +0.090 1n972b -1 1n973b -1 1n974b -1 1n975b -1 1n976b -1 30 33 36 39 43 4.2 3.8 3.4 3.2 3.0 49 58 70 80 93 1000 1000 1000 1000 10 00 250 250 250 250 250 13 12 11 9.1 8.8 216 197 180 166 151 0. 5 0. 5 0. 5 0. 5 0. 5 23 25 27 30 33 +0.091 +0.092 +0.093 +0.094 +0.095 1n977b -1 1n978b -1 1n979b -1 1n980b -1 1n981b -1 47 51 56 62 68 2.7 2.5 2.2 2.0 1.8 105 125 150 185 230 1500 1500 2000 2000 2000 250 250 250 250 250 7.9 7.4 6.9 6.0 5.5 138 127 116 105 95 0. 5 0. 5 0. 5 0. 5 0.5 36 39 43 47 52 +0.095 +0.096 +0.096 +0.097 +0.097 1n982b -1 1n983b -1 1n984b -1 1n985b -1 1n986b -1 75 82 91 100 110 1.7 1.5 1.4 1.3 1.1 270 330 400 500 750 2000 3000 3000 3000 4000 250 250 250 250 250 5.1 4.6 4.2 3.7 3.3 86 79 71 65 59 0. 5 0. 5 0. 5 0. 5 0. 5 56 62 69 76 84 +0.098 +0.098 +0.099 +0.11 0 +0.11 0 1n987b -1 1n988b -1 1n989b -1 1n990b -1 1n991b -1 1n992b -1 120 130 150 160 180 200 1.0 0.95 0.85 0.80 0.68 0.65 900 1100 1500 1700 2200 2500 4500 5000 6000 6500 7100 8000 250 250 250 250 250 250 3.1 2.7 2.4 2.2 2.0 1.8 54 50 43 40 36 32 0. 5 0. 5 0. 5 0. 5 0. 5 0. 5 91 99 114 122 137 152 +0.11 0 +0.11 0 +0.11 0 +0.11 0 +0.11 0 +0.11 0 notes: 1. the jedec type numbers shown (b suffix) have a 5% tolerance on nominal z ener voltage. the suffix c will have 2% tolerance ; and suffix d will have 1% tolerance . 2. zener voltage (v z ) is measured after the test current has been applied for 20 5 seconds. the device shall be suspended by its leads with the inside edge of the mounting clips between 0.375 and 0.500 from the body. m ounting clips shall be maintained at temperature of 25 8/ - 2 c. 3. the z ener impedance is derived when a 60 cycle ac current having an rms value equal to 10% of the dc z ener current (i zt or i zk ) is superimposed on i zt or i zk . zener impedance is measured at 2 points to ensure a sharp knee on the breakdown curve and to eliminate unstable units. see micronote 202 for variation in dynamic impedance with different z ener currents. 4. the values of i zm are calculated for a 5% tolerance on nominal z ener voltage. allowance has been made for the rise in z ener voltage above v zt which results from z ener impedance and the increase in junction temperature as power dissipation approaches 40 0 mw. in the case of individual diodes i zm is that value of current which results in a dissipation of 400 mw at 75c lead temperature at 3/ 8 from body. 5. the surge for i zsm is a square wave or equivalent half - sine wave pulse of 1/120 sec. duration. downloaded from: http:///
t4 - lds - 0287 , rev . 1 (1 2 1795 ) ?201 2 microsemi corporation page 5 of 8 1n957b-1 C 1n992b-1 gra phs t l (oc) (leads .375 ) figure 1 temperature - power derating curve t l (oc) (pcb) figure 2 temperature - power derating curve (pcb mount) dc operations maximum rating (mw) dc operations maximum rating (mw) downloaded from: http:///
t4 - lds - 0287 , rev . 1 (1 2 1795 ) ?201 2 microsemi corporation page 6 of 8 1n957b-1 C 1n992b-1 graphs time (s) figure 3 thermal impedance pcb mount time (s) figure 4 thermal impedance theta ( c/w) theta ( c/w) downloaded from: http:///
t4 - lds - 0287 , rev . 1 (1 2 1795 ) ?201 2 microsemi corporation page 7 of 8 1n957b-1 C 1n992b-1 graphs lead temperature ( oc ) ( at described lead length ) i nc h es m illime ters . 000 0. 00 . 125 3. 18 . 250 6. 35 . 375 9. 53 figure 5 maximum power vs lead temperature and lead length. maximum power dissipation ( mw ) downloaded from: http:///
t4 - lds - 0287 , rev . 1 (1 2 1795 ) ?201 2 microsemi corporation page 8 of 8 1n957b-1 C 1n992b-1 package dimensions ltr d imensions notes inch m illimeters min max min max bd .05 5 .090 1.40 2.29 3 bl .120 .200 3.05 5.08 3 ld .018 .022 0.46 0.56 ll 1.000 1.500 25.40 38.10 ll 1 .050 1.27 4 no tes: 1 . d imension s ar e in inch. 2 . m illimeter s ar e gi ven fo r genera l informatio n onl y. 3 . packag e contou r optiona l w ithi n b d an d lengt h bl . h ea t slugs , if an y , shal l be include d w ithi n thi s cy linde r bu t shal l no t be subjec t to minimum limi t of l d. the bl dimensio n shal l includ e th e entir e bod y including slugs. 4 . w ithi n ll 1 lead , diamete r may v ar y to allo w fo r fo r flash, lead finish build - up, and minor irregularities other than heat slugs . 5 . in accordanc e w it h asme y 14.5 m, diameter s ar e equi v alen t to x sy mbolog y. downloaded from: http:///
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