t4 - lds -0 15 8, rev. 2 (1 2 1998 ) ?201 3 microsemi corporation page 1 of 6 1n935bur-1 C 1n 938b ur -1 cdll935 C cd ll 938b 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 ur - 1 thr ough 1n938 b ur - 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 surface mount do - 213aa reference diodes are also available in jan, jantx, jantxv and jans military qualifications. for comm ercial applications it is also available as rohs c ompliant (not applicable to military). do - 213aa melf package also available in : do - 35 (do - 204ah) package ( axial - leaded ) 1n935b -1 C 1n938b -1 important: for the latest information, visit our website http://www.microsemi.com . features ? surface mount equivalent of jedec registered 1n 935 thr ough 1n 938 number series . ? standard reference voltage of 9.0v +/ - 5%. ? temperature compensated. ? internal metallurgical bond . ? double plug co nstruction. ? 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 instrume ntation and other circuit designs requiring a stable voltage reference. ? maximum temperature coefficient selections available from 0.01 %/oc to 0.00 1 %/oc. ? melf surface mount . ? non - sensitive to esd per mil - std - 750 m ethod 1020. maximum ratings @ t a = 25 o c unless otherwise stated msc C law rence 6 lake street, lawrence, ma 01841 1- 800 - 446 - 1158 tel: (978) 620 - 2600 fax: (978) 689 - 0803 msc C irela nd gort road business park, ennis, co. clare, ireland tel: +353 (0) 65 6840044 fax: +353 (0) 65 6822298 website: www.microsemi.com parameters/test c onditions symbol value unit junction 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 ec = 50 o c (see figure 1 ) . for 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 15 8, rev. 2 (1 2 1998 ) ?201 3 microsemi corporation page 2 of 6 1n935bur-1 C 1n 938b ur -1 cdll935 C cd ll 938b mechanical and packaging ? case: hermetically sealed glass case package. ? terminals: tin/le ad 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 1n935 b ur -1 e3 reliability level * jan = jan level jantx = jantx level jantxv = jantxv level jans = jans level blank = commercial *(available on b suffix on ly) jedec type number (s ee electrical characteristics t able ) rohs compliance e3 = rohs c ompliant ( available on commercial grade only ) blank = non - rohs c ompliant metallurgical bond melf surface mount t emperature 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 reg ulator 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 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 -0 15 8, rev. 2 (1 2 1998 ) ?201 3 microsemi corporation page 3 of 6 1n935bur-1 C 1n 938b ur -1 cdll935 C cd ll 938b electrical characteristics @ 25 o c unless otherwise specified mil - prf - 19500/156 msc type number (note 1) zener voltage v z @ i zt zener test current i zt maximum zener impedace (note 2) z zt voltage temperature stability ? v zt maximum (note 3) temperature range effective temperature coefficient vz v olts ma o hms mv c % / c 1n935b ur -1 cdll935 cdll 935a cdll 935b 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 cdll936 cdll 936a cdll 936b 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 0.005 0.005 0.005 1n937b ur -1 cdll937 cdll 937a cdll 937b 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 ur -1 cdll938 cdll 938a cdll 938b 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: microsemi cdll prefixed numbers are commercial use only. for high - reliability applications jan prefixed 1n numbers mus t be selected along with the b suffix . note 2: zener impedance is derived by superimposing on i zt a 60 hz rms a c current equal to 10% of i zt . note 3 : 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 15 8, rev. 2 (1 2 1998 ) ?201 3 microsemi corporation page 4 of 6 1n935bur-1 C 1n 938b ur -1 cdll935 C cd ll 938b graphs t ec , end cap 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 15 8, rev. 2 (1 2 1998 ) ?201 3 microsemi corporation page 5 of 6 1n935bur-1 C 1n 938b ur -1 cdll935 C cd ll 938b graphs operating 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 15 8, rev. 2 (1 2 1998 ) ?201 3 microsemi corporation page 6 of 6 1n935bur-1 C 1n 938b ur -1 cdll935 C cd ll 938b p ackage 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 with 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 0 .200 5.08 b 0 .055 1.40 c 0 .080 2.03 downloaded from: http:///
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