t4 - lds - 0287 -1, rev . 1 (12 1795 ) ?201 2 microsemi corporation page 1 of 6 1n957bur-1 C 1n992b ur -1 available on commercial versions s ilicon melf 500 mw z ener d iodes qualified per mil - prf - 19500/11 7 qualified levels * : jan, jantx, and jantxv description the popular 1n957b ur -1 through 1n992b ur -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 glass melf do - 213aa zeners feature an internal metallurgical bond and are available in military qualified and commercial rohs compliant versions . military qualified versions are available on the 1n962bur - 1 through 1n992bur - 1 range of part numbers. do - 213aa melf package also available in : do - 35 (do - 204ah) package ( axial - leade d) 1n9 57 b- 1 C 1n992b -1 important: for the latest information, visit our website http://www.microsemi.com . features ? jedec registere d 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 1n962bur - 1 thr ough 1n992bur -1 . ? upscreening is available in reference to mil - prf - 19500 for the range of 1n957bur - 1 thr ough 1n961bur - 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%. ? small size for high density mounting using the surface mount method (see package illust ration). ? non - sensit ive 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 stre et, 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, ir eland 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 - end cap r ? j ec 10 0 oc /w thermal resistance junction - to - ambient when mounted on pcb (1) r ? ja 30 0 oc /w steady - state power dissipation @ t ec = +125 c (2) @ t a = 5 5c mounted on pc b p d 0.5 0.4 w forward voltage @ i f = 200 ma 1n9 57 ur C 1n985 ur 1n98 6 ur C 1n992 ur v f 1.1 1.3 v solder temperature @ 10 s t sp 260 o c notes: 1. see figure 1 for derating curves. t a = +75c on an fr4 pc board with 1 oz copper m etalization. 2. derate to 0 at +175c. downloaded from: http:///
t4 - lds - 0287 -1, rev . 1 (12 1795 ) ?201 2 microsemi corporation page 2 of 6 1n957bur-1 C 1n992b ur -1 mechanical and packaging ? case: hermetically sealed glass case package. ? terminals: t in /l ead plated or rohs compliant m atte -t in (on commercial grade only) over copper clad steel . s olderable per mil - std - 750, method 2026. ? polarity: cathode end is banded. ? mounting: the a xial c oefficient of e xpansion (coe) o f this d evice is a pproximately +6ppm/c. the coe of the m ounting s urface s ystem s hould b e s elected t o p rovide a s uitable m atch w ith t his d evice. ? marking: p art number. ? tape & reel option: standard per eia - 296. consult factory for quantities. ? weight: 0. 04 grams. ? see p ackage d imensions on last page. part nomenclature 1n957 bur -1 C 1n961 bur -1 only : 1n957 b ur -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 metallurgically bonded surface mount package type 1n962bur - 1 C 1n992bur - 1 only: jan 1n9 62 b ur -1 (e3) reliability level jan = jan level jantx = jantx level jantxv = jantxv level blank = commercial jedec type number (s ee electrical characteristic 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 surface mount package type downloaded from: http:///
t4 - lds - 0287 -1, rev . 1 (12 1795 ) ?201 2 microsemi corporation page 3 of 6 1n957bur-1 C 1n992b ur -1 symbols & definitio ns symbol definition i r reverse current: the maximum reverse (leakage) current that will flow at the specified vol tage 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 rat ing. 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 brea kdown region. z zt or z zk dynamic impedance: the small signal impedance of the diode when biased to operate in its break down 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 -1, rev . 1 (12 1795 ) ?201 2 microsemi corporation page 4 of 6 1n957bur-1 C 1n992b ur -1 electr ical characteristics jedec type number (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 reve rse leakage current i r @ v r maximum temperature coefficient vz volts ma o hms o hms a ma ma a v olts %/c 1n957b ur -1 1n958b ur -1 1n959b ur -1 1n960b ur -1 1n961b ur -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 70 0 250 250 250 250 250 55 50 45 41 38 300 275 250 225 200 150 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 ur -1 1n963b ur -1 1n964b ur -1 1n965b ur -1 1n966b ur -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 ur -1 1n968b ur -1 1n969b ur -1 1n970b ur -1 1n971b ur -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 7 50 250 250 250 250 250 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 ur -1 1n973b ur -1 1n974b ur -1 1n975b ur -1 1n976b ur -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 ur -1 1n978b ur -1 1n979b ur -1 1n980b ur -1 1n981b ur -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 ur -1 1n983b ur -1 1n984b ur -1 1n985b ur -1 1n986b ur -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 ur -1 1n988b ur -1 1n989b ur -1 1n990b ur -1 1n991b ur -1 1n992b ur -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 s hown (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. mounting 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 a re 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 400 mw. in the case o f 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 -1, rev . 1 (12 1795 ) ?201 2 microsemi corporation page 5 of 6 1n957bur-1 C 1n992b ur -1 graphs t ec (oc) (e nd cap) figure 1 temperature - power derating curve time (s) figure 2 thermal impedance dc operations maximum rating (mw) theta (c/w) downloaded from: http:///
t4 - lds - 0287 -1, rev . 1 (12 1795 ) ?201 2 microsemi corporation page 6 of 6 1n957bur-1 C 1n992b ur -1 package dimensions notes: 1. dimensions are in inches. millimeters are given for general information only. 2. dimensions are pre - solder dip. 3. referencing to dimension s, minimum clearance of glass body to mounting surface on all orientations. 4. in accordance w ith asme y14.5m, diameters are equivalent to x symbology. pad layout dim inch millimeters min max min max bd 0.063 0.067 1.60 1.70 bl 0.130 0.146 3.30 3.71 ect 0.016 0.022 0.41 0.56 s 0 .001 - 0.03 - inch mm a .200 5.08 b .055 1.40 c .080 2.03 downloaded from: http:///
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