t4 - lds -0 155, rev. 2 (1 2 1998 ) ?201 3 microsemi corporation page 1 of 6 1n935b-1 C 1n 938b-1 available on commercial versions temperature compensated zener r eference diodes qualified per mil - prf - 19500/15 6 qualified levels : jan, jantx, jantxv and jan s description the popular 1n935b - 1 thr ough 1n9 38 b- 1 series of zero - tc (temperature compensated) r eference d iodes provides a selection of 9.0 v nominal voltages and temperature coefficients to as low as 0.00 1 %/ o c for minimal voltage change with temperature when operated at 7.5 ma. these glass axial - leaded do - 35 reference diodes are also available in jan, jantx, jantxv and jans military qualifications. for commercial applications it is also ava ilable as rohs c ompliant. do - 35 (do - 204ah) package also available in : do - 213aa melf (surface mount) 1n935b ur -1 C 1n938b ur -1 important: for the latest information, visit our website htt p://www.microsemi.com . features ? jedec registered 1n 935 thr ough 1n 938 number series . ? standard reference voltage of 9.0v +/ - 5%. ? temperature compensated. ? internal metallurgical bond . ? double plug construction. ? jan, jantx, jantxv and jans qualification are available per mil - prf - 19500/15 6. ? rohs compliant versions available (commercial grade only) . applications / benefits ? provides minimal voltage changes over a broad temperature range. ? for instrumentation and other circuit designs requiring a stable voltage reference. ? maximum temperature coefficient selections available from 0.01 %/oc to 0.00 1 %/oc. ? flexible axial - lead mounting terminals. ? non - sensitive to esd per mil - std - 750 m ethod 1020. maximum ratings @ t a = 25 oc unless otherwise stated msc C la w rence 6 lake street, lawrence, ma 01841 1- 800 - 446 - 1158 tel: (978) 620 - 2600 fax: (978) 689 - 0803 msc C ireland gort road business park, enni s, co. clare, ireland tel: +353 (0) 65 6840044 fax: +353 (0) 65 6822298 website: www.microsemi.com parameters/test conditions symbol value unit junct ion and storage temperature t j and t stg -6 5 to +175 o c power dissipation (1) p d 500 mw maximum zener current i zm 50 ma solder pad temperatures at 10 s t sp 260 o c notes : 1. @ t l = 50 o c maximum (see figure 1 ) . fo r optimum voltage - temperature stability, i z = 7.5 ma (less than 50 mw in dissipated power). derate at 3.33 mw/ o c above t a = +25 o c . downloaded from: http:///
t4 - lds -0 155, rev. 2 (1 2 1998 ) ?201 3 microsemi corporation page 2 of 6 1n935b-1 C 1n 938b-1 mechanical and packaging ? case: hermetically sealed glass case. do - 35 (do - 204ah) package. ? terminals: tin -l ead or rohs compliant annealed matte -t in plating (commercial grade only) over copper clad steel. s olderable per mil - std - 750, m ethod 2026. ? marking: part number and cathode band. ? polarity: reference diode to be operated with the banded (cathode) end positive with respect to the opposite end. ? tape & reel option: standard per eia - 296 (add tr suffix to part number). consult factory for quantities. ? weight: approximately 0.2 grams. ? see p ackage d imensions on last page. part n omenclature jan 1n935 b -1 e3 reliability level * jan = jan level jantx = jantx level jantxv = jantxv level jans = jans level * (available on b suffix only) blank = commercial jedec type number (s ee elec trical characteristics t able ) rohs compliance e3 = rohs c ompliant ( available on commercial grade only ) blank = non - rohs c ompliant metallurgical bond temperature range blank = 0 to +75 oc a = - 55 to +100 oc b = - 55 to +150 oc (required for jan level) symbols & definitions symbol definition i zm maximum zener current: the maximum rated dc current for the specified power rating. 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 ). 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 spec ified 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 -0 155, rev. 2 (1 2 1998 ) ?201 3 microsemi corporation page 3 of 6 1n935b-1 C 1n 938b-1 electrical characteristics @ 25 o c unless otherwise specified mil - prf - 19500/156 jedec type number zener voltage v z @ i zt zener test current i zt maximum zener impedace (note 1) z zt voltage temperature stability ? v zt maximum (note 2) temperature range effective temperature coefficient vz v olts ma o hms mv c % / c 1n935b -1 1n935 -1 1n935a -1 1n935b -1 8.55 C 9.45 8.55 C 9.45 8.55 C 9.45 7.5 7.5 7. 5 20 20 20 67 139 184 0 to +75 - 55 to +100 - 55 to +150 0.01 0.01 0.01 1n936 -1 1n936a -1 1n936b -1 8.55 C 9.45 8.55 C 9.45 8.55 C 9.45 7.5 7.5 7.5 20 20 20 34 70 92 0 to +75 - 55 to +100 - 55 to +150 0.055 0.005 0.005 1n937b -1 1n937 -1 1n937a -1 1n937b -1 8.55 C 9.45 8.55 C 9.45 8.55 C 9.45 7.5 7.5 7.5 20 20 20 13 28 37 0 to +75 - 55 to +100 - 55 to +150 0.002 0.002 0.002 1n938b -1 1n938 -1 1n938a -1 1n938b -1 8.55 C 9.45 8.55 C 9.45 8.55 C 9.45 7.5 7.5 7.5 20 20 20 6.7 13.9 19 0 to +75 - 55 to +100 - 55 to +150 0.001 0.001 0.001 note 1: zener impedance is derived by superimposing on i zt a 60 hz rms ac current equal to 10% of i zt . note 2: the maximum allowable change observed over the entire temperature range i.e., the diode voltage will not exceed the specified mv at any discrete temperature between the established limits, per jedec standard no. 5. downloaded from: http:///
t4 - lds -0 155, rev. 2 (1 2 1998 ) ?201 3 microsemi corporation page 4 of 6 1n935b-1 C 1n 938b-1 graphs t l , lead temperature (c) 3/8 from body figure 1 power derating curve operating current i z (ma) figure 2 zener impedance vs. operating current pd, rated power dissipation (mw) zener impedance z zt (ohms) downloaded from: http:///
t4 - lds -0 155, rev. 2 (1 2 1998 ) ?201 3 microsemi corporation page 5 of 6 1n935b-1 C 1n 938b-1 graphs oper ating current i z (ma) figure 3 typical change of temperature coefficient with change in operating current change in temperature coefficient (%/c) downloaded from: http:///
t4 - lds -0 155, rev. 2 (1 2 1998 ) ?201 3 microsemi corporation page 6 of 6 1n935b-1 C 1n 938b-1 package dimensions ltr d imensions notes inch m illimeters min max min max bd 0 .0 60 0.075 1.52 1.91 3 bl 0.140 0.180 3.56 4.57 3 ld 0 .018 0 .022 0.46 0.56 ll 1.000 1.500 25.40 38.10 ll 1 0 .050 1.27 4 no tes: 1. dimensions are in inches. 2. millimeters are give n for general information onl y. 3. package contour optional w ithin bd and length bl. h eat slugs, if any shall be included w ithin this c y linder but shall not be subject to minimum limit of bd. 4 . w ithin this zone, lead diameter may vary to all ow for lead finishes and irregularities, other than heat slugs. 5 . in accordance w ith asme y14.5m, diameters are equivalent to x s ym bolog y. 6. the dimensions s hown are tighter in tolerance than dimensions shown in the military slash sheet (/156) since micro semi now on ly offers the smaller do - 35 pac ka ge option rather than the larger do - 7. downloaded from: http:///
|
