t4 - lds - 0288 -1, rev . 1 ( 5/2 3 /13 ) ?201 3 microsemi corporation page 1 of 6 1n746a ur -1 C 1n759a ur -1, 1n4370a ur -1 C 1n4372a ur -1 available on commercial versions s ilicon melf 500 mw z ener d iodes qualified per mil - prf - 19500/1 27 qualified levels : jan, jantx, and jantxv description th is popular series of 5 00 mw zener voltage r egulators provides a selection from 2.4 to 12 volts in a standard 5% tolerance as well as available tighter 2% and 1% tolerances . these glass, surface mount do - 213aa zeners feature an internal metallurgical bond and are military qualif ied to the jan, jantx, and jantxv level. a rohs c ompliant commercial grade only version is also available . do - 213aa melf package also available in : do - 35 (do - 204ah) package ( axial - leaded ) 1n746a -1 C 1n759a -1 and 1n4370a - 1 C 1n4372a -1 important: for the latest information, visit our website http://www.microsemi.com . features ? jedec registered 1n746 thr ough 1n759 a and 1n4370 thr ough 1n4372a series . ? standard voltage tolerance is 5 % with option al tighter tolerances of 2% or 1% . ? internal metallurgical bond. ? j an, jantx, and jantxv qualification s are available per mil - prf - 19500/ 127 . (see part nomenclature for all available options.) ? rohs c ompliant version s available (commercial grade only). ? these commercial surface mount equivalents were also previously identified with a cdll or m ll prefix instead of the "1n" prefix. ap plications / benefits ? regulates voltage over a broad range of temperature and current. ? regulated voltage range from 2.4 to 12 v. ? small size for high density mounting using the surface mount method (see package illust ration) . ? 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 0 1841 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 an d 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 pc b (1) r ? ja 300 oc /w average rated power dissipation @ t ec = +125c (2) @ t a = 5 5c mounted on pc b p m(av) 0.5 0.4 w f or w ard voltage @ i f = 200 ma v f 1.1 v solder temperature @ 10 s 260 o c notes: 1. see f igure 1 for derating curves. t a = +75 c on an fr4 pc board with 1 oz copper metalization . 2. the 0.5 w linearly derates starting at t ec = 125 c and goes to zero at 175 c . for ambient t a condition on a typical pc board, it linearly derates from 400 mw starting at 55 c and goes to zero at 175 c (see figure2 ). downloaded from: http:///
t4 - lds - 0288 -1, rev . 1 ( 5/2 3 /13 ) ?201 3 microsemi corporation page 2 of 6 1n746a ur -1 C 1n759a ur -1, 1n4370a ur -1 C 1n4372a ur -1 mechanical and packaging ? case: hermetica lly sealed glass case package. ? terminals: tin/lead plated or rohs compliant matte - tin (on commercial grade only) over copper clad steel. solderable per mil - std - 750, method 2026. ? polarity: cathode end is banded. ? mounting: the axial coefficient of expansion (coe) of this device is approximately +6pp m/c. the coe of the mounting surface system should be selected to provide a suitable match with this device. ? marking: part number. ? tape & reel option: standard per eia - 296. consult factory for quantities. ? weight: approximately 0.04 grams. ? see p ackage d imensions on last page. part nomenclature jan 1n746 a ur -1 (e3) reliability level jan = jan level jantx = jantx level jantxv = jantxv level blank = commerci al jedec type number (s ee electrical characteristics t able ) zener voltage tolerance a = 5% c = 2% d = 1% rohs compliance e3 = rohs c ompliant ( available on commercial grade only ) blank = non - rohs c ompliant metallurgically bonded surface mount package type symbols & definitions 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 breakdown 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 (typical ly 10% of i zt or i zk ) and superimposed on i zt or i zk respectively. downloaded from: http:///
t4 - lds - 0288 -1, rev . 1 ( 5/2 3 /13 ) ?201 3 microsemi corporation page 3 of 6 1n746a ur -1 C 1n759a ur -1, 1n4370a ur -1 C 1n4372a ur -1 electrical characteristics @ 25 oc jedec type no. (note 1) nominal zener voltage v z @ i zt (note 2) maximum zener impedance z zt @ i zt (note 3) reverse voltage v r maximum reverse curr ent i r @ v r maximum zener current i zm (note 4) temp erature coefficient of zener voltage vz @ 25 c @ +150 c v olts ohms volts a a ma % / c 1n4370 a-1 1n4371 a-1 1n4372 a-1 2.4 2.7 3.0 30 30 29 1.0 1.0 1.0 100 60 30 200 150 100 155 140 125 - 0.085 - 0.080 - 0.075 1n746 a-1 1n747 a-1 1n748 a-1 3.3 3.6 3.9 24 22 20 1.0 1.0 1.0 5 3 2 30 30 30 120 110 100 - 0.070 - 0.065 - 0.060 1n749 a-1 1n750 a-1 1n751 a-1 1n752 a-1 4.3 4.7 5.1 5.6 18 15 14 8 1.0 1.5 2.0 2.5 2 5 5 5 50 50 50 50 90 85 75 70 - 0.055 / +.020 - 0.043 / +.025 - 0.030 / +.030 - 0.028 / +.036 1n753 a-1 1n754 a-1 1n755 a-1 1n756 a-1 6.2 6.8 7.5 8.2 3 3 4 5 3.5 4.0 5.0 6.0 5 2 2 1 50 50 50 50 65 60 55 50 +0.045 +0.050 +0.058 +0.062 1n757 a-1 1n758 a-1 1n759 a-1 9.1 10.0 12.0 6 7 10 7.0 8.0 9.0 1 1 1 50 50 50 45 40 35 +0.068 +0.076 +0.080 notes: 1 the jedec type numbers shown ( a suffix) have a 5% tolerance on nominal z ener voltage. 2. voltage measurements to be performed 20 seconds after application of dc test current. 3. zener impedance derived by superimposing on i zt , a 60 cps, rms current equal to 10% i zt (2 0 ma ). see micronote 202 for typical z ener impedance variation with different operating currents. 4. allowance has been made for the increase in v z due to z z and for the increase in junction temperature as the unit approaches thermal equilibrium at the power dissipation of 400mw. downloaded from: http:///
t4 - lds - 0288 -1, rev . 1 ( 5/2 3 /13 ) ?201 3 microsemi corporation page 4 of 6 1n746a ur -1 C 1n759a ur -1, 1n4370a ur -1 C 1n4372a ur -1 graphs t ec (oc) (end cap) figure 1 temperature - power derating curve t (pcb) (oc) (pcb) figure 2 temperature - power derating curve dc operations maximum rating (mw) dc operations maximum ratin g (mw) downloaded from: http:///
t4 - lds - 0288 -1, rev . 1 ( 5/2 3 /13 ) ?201 3 microsemi corporation page 5 of 6 1n746a ur -1 C 1n759a ur -1, 1n4370a ur -1 C 1n4372a ur -1 graphs (continued) time (s) f igure 3 thermal impedance to end cap theta ( c/w) downloaded from: http:///
t4 - lds - 0288 -1, rev . 1 ( 5/2 3 /13 ) ?201 3 microsemi corporation page 6 of 6 1n746a ur -1 C 1n759a ur -1, 1n4370a ur -1 C 1n4372a ur -1 package dimensions notes: 1. dimensions are in inches. millimeters are given for 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 with asme y14.5m, diamete rs 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 min 0.03 min inch mm a 0 .200 5.08 b 0 .055 1.40 c 0 .080 2.03 downloaded from: http:///
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