t4 - lds - 0288 , rev . 1 (5/23/13 ) ?201 3 microsemi corporation page 1 of 6 1n746a-1 C 1n759a-1, 1n4370a-1 C 1n 4372a- 1 available on commercial versions s ilicon 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 500 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 axial - leaded , glass do - 35 zeners feature an internal metallurgical bond and are military qualified to th e jan, jantx, and jantxv level. a rohs c ompliant commercial grade only version is also available . do - 35 (do - 204ah) package also available in : do - 213aa package ( melf surface mount) 1n746a ur - 1 C 1n759a ur -1 and 1n4370aur -1 C 1n4372aur -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). applications / benefits ? regulates voltage over a broad range of temperature and current. ? regulated voltage range from 2.4 to 12 v. ? 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 ire land 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 300 oc /w average rated power dissipation @ t l = + 50c .375 inch ( 9.53 mm) from body (2 ) @ t a = 5 5c mounted on pc b p m(av) 0.5 0.4 w for w ard voltage @ i f = 200 ma v f 1.1 v solder temperature @ 10 s t sp 260 o c notes: 1. see f igures 1 and 2 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 l = 50 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 figure 2 ). downloaded from: http:///
t4 - lds - 0288 , rev . 1 (5/23/13 ) ?201 3 microsemi corporation page 2 of 6 1n746a-1 C 1n759a-1, 1n4370a-1 C 1n 4372a- 1 mechanical and packaging ? case: hermetically sealed axial - lead glass do - 35 (do - 204 ah) package . ? terminals: tin - lead 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 zener regulation . ? tape & reel option: standard per eia - 296 (add tr suffix to part number) . ? weight: approximately 0.2 grams ? see p ackage d imensions on last page. part nomenclature jan 1n746 a -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 a = 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 symbols & definitions symbol definition i r reverse current: the maximum reverse (leakage) current that will flow at the specified voltage 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 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 - 0288 , rev . 1 (5/23/13 ) ?201 3 microsemi corporation page 3 of 6 1n746a-1 C 1n759a-1, 1n4370a-1 C 1n 4372a- 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) maximum reverse voltage v r maximum reverse current 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 400 mw. downloaded from: http:///
t4 - lds - 0288 , rev . 1 (5/23/13 ) ?201 3 microsemi corporation page 4 of 6 1n746a-1 C 1n759a-1, 1n4370a-1 C 1n 4372a- 1 graphs t l (oc) (leads .375 ) figure 1 temperature - power derating curve t (pcb) (oc) (pcb) figure 2 temperature - power derating curve dc operations maximum rating (mw) dc operations maximum rating (mw) downloaded from: http:///
t4 - lds - 0288 , rev . 1 (5/23/13 ) ?201 3 microsemi corporation page 5 of 6 1n746a-1 C 1n759a-1, 1n4370a-1 C 1n 4372a- 1 graphs (continued) time (s) figure 3 thermal impedance pcb mount time (s) figure 4 thermal impedance (t l = 25 oc at 0.375 inch (9.53 mm) from body.) theta ( c/w) theta ( c/w) downloaded from: http:///
t4 - lds - 0288 , rev . 1 (5/23/13 ) ?201 3 microsemi corporation page 6 of 6 1n746a-1 C 1n759a-1, 1n4370a-1 C 1n 4372a- 1 package dimensions ltr d imensions notes inch m illimeters min max min max bd 0 .05 5 0 .090 1.40 2.29 3 bl 0 .120 0 .200 3.05 5.08 4 ld 0 .018 0 .02 3 0.46 0.5 8 ll 1.000 1.500 25.40 38.10 ll 1 - 0 .050 - 1.27 5 no tes: 1. dimensions are in inches. 2. millimeters are given for information only. 3. dimension bd shall be measured at the largest diameter. 4. the bl dimension shall include the entire body including slugs. 5. dimension lu shall include the sections of the lead over which the diameter is uncontrolled. this uncontrolled area is defined as the zone between the edge of the diode body and extending 0 .050 inch (1.27 mm) onto the leads. 6. in accordance with asme y14.5m, diameters are equivalent to x symbology. downloaded from: http:///
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