lds - 0222, rev . 1 (111515) ?2011 microsemi corporation page 1 of 6 1n941 -1 thru 1n945b -1 available on commercial versions 1 1.7 volt temperature compensated zener reference diodes qualified per mil -prf- 19500/157 qualified levels : jan, jantx , jantxv and jans (availab le on some part numbers) description the popular 1n941 -1 thru 1n945b -1 series of z ero - tc r eference d iodes provides a selection of 1 1.7 v nominal voltages and temperature coefficients to as low as 0.0002 %/ o c for minimal voltage change with temperature when operated at 7.5 ma. t he b version of these glass , axial - leaded do - 35 reference diodes are also available in jan, jantx, jantxv , and jans military qualifications. microsemi also offers numerous other zener r eference d iode products for a variety of other voltages from 6.2 v to 200 v. do - 35 (do - 204ah) package also available in : do - 213aa (surface mount) 1n941ur - 1 thru 1n945bur -1 important: for the lat est information, visit our website http://www.microsemi.com . features ? jedec registered 1n 941 thru 1n 945 series . ? standard reference voltage of 1 1.7 v +/ - 5% with tighter reference tolerances of 1%, 2%, and 3% a vailable on commercial level only . ? internal metallurgical bond . ? jan, jantx, jantxv , and jans qualification per mil - prf - 19500/157 available for 1n941b -1 , 1n943b -1 , 1n944b -1 , and 1n945b -1. ? rohs compliant versions available (commercial grade only) . applica tions / 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 0.000 5 %/oc. ? fl exible axial - lead mounting terminals. ? non - sensitive to esd per mil - s td - 750 m ethod 1020. m axim um ratings msc C law rence 6 lake street, lawrence, ma 01841 tel: 1- 800 - 446 - 1158 or (978) 620 - 2600 fa x: (978) 689 - 0803 msc C ireland gort road business park, ennis, co. clare, ireland tel: +353 (0) 65 6840044 fax: +353 (0) 65 6822298 we bsite: www.microsemi.com parameters/test conditions symbol value unit power dissipation @ t a = + 25 o c and maximum current i zm of 39 ma. (1 , 2) p d 500 mw junction and storage temp t j and t stg - 55 to +175 o c m aximum zener current i zm 39 ma solder temperature @ 10 s t sp 260 o c notes : 1. for optimum voltage - temperature stability, i z = 7.5 ma (less than 95 mw in dissipated power). 2. derate at 3.33 mw/ o c above t a = +25 o c. downloaded from: http:///
lds - 0222, rev . 1 (111515) ?2011 microsemi corporation page 2 of 6 1n941 -1 thru 1n945b -1 mechanical and packaging ? case: hermetically sealed glass case with axial do - 35 (do - 204ah) package. ? terminals: tin - lead plated or rohs compliant matte -t in plating available (on commercial grade only) and solderable per mil - std - 750, m ethod 2026. ? marking: part number and cathode band. ? polarity: reference diode to be operated with the banded end positive with respect to the opposite end. ? tape & reel option: standard per eia - 296 . consult factory for quantities. (a dd tr suffix to part number .) ? weight: 0.2 grams. ? see p ackage d imensions on the last page. part nomenclature applicable to: jan , jantx, jantxv and jans level 1n941 b , 1n943 b , 1n944 b , and 1n945 b only : jan 1n941 b -1 reliability level jan = jan level jantx = jantx level jantxv = jantxv level jans = jans level jedec type number ( see e lectrical characteristic s t able ) metallurgical ly bond ed temperature coefficient range of - 55 o c to +150 o c applicable to: commercial level 1n941 thru 1n945 b : 1n941 a -1 - 1% (e3) jedec type number ( see electrical characteristics t able ) temperature coefficient range: a = - 55 o c to +100 o c b = -55 o c to +150 o c blank = 0 o c to +75 o c rohs compliance e3 = rohs c ompliant (available on commercial grade only) blank = non - rohs c ompliant tighter reference tolerance 1% 2% 3% blank = 5% metallurgical ly bond ed downloaded from: http:///
lds - 0222, rev . 1 (111515) ?2011 microsemi corporation page 3 of 6 1n941 -1 thru 1n945b -1 symbols & definitions symbol definition i r reverse current: the maximum reverse (leakage) current that will flow at the specified volt age 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 rati ng. v z zener voltage: the z ener voltage the device will exhibit at a specified current (i z ) in its breakdown region. v zt zener voltage temperature. z zt or z zk dynamic impedance: the small signal impedance of the diode when biased to operate in its breakdown region a t a specified rms current modulation (typically 10% of i zt or i zk ) and superimposed on i zt or i zk respectively. electrical characteristics @ 25 o c unless otherwise specified jedec type number (note 4) zener voltage v z @ i zt (note 3) zener test current i zt maximum zener impedance z zt @ i zt (note 1) maximum reverse current i r @ 8 v voltage temperature st ab ilit y ? v zt maximum (note 2 & 3) temperature range effective temperature coefficie nt vz volts ma ohms a mv o c % / o c 1n941 -1 1n941a -1 1n941b -1 11.12 - 12.28 11.12 - 12.28 11.12 - 12.28 7.5 7.5 7.5 30 30 30 15 15 15 88 181 239 0 to +75 - 55 to +100 - 55 to +150 0.01 0.01 0.01 1n942 -1 1n942a -1 1n942b -1 11.12 - 12.28 11.12 - 12.28 11.12 - 12.28 7.5 7.5 7.5 30 30 30 15 15 15 44 90 120 0 to +75 - 55 to +100 - 55 to +150 0.005 0.005 0.005 1n943 -1 1n943a -1 1n943b -1 11.12 - 12.28 11.12 - 12.28 11.12 - 12.28 7.5 7.5 7.5 30 30 30 15 15 15 18 36 47 0 to +75 - 55 to +100 - 55 to +150 0.002 0.002 0.002 1n944 -1 1n944a -1 1 n944b -1 11.12 - 12.28 11.12 - 12.28 11.12 - 12.28 7.5 7.5 7.5 30 30 30 15 15 15 9 18 24 0 to +75 - 55 to +100 - 55 to +150 0.001 0.001 0.001 1n945 -1 1n945a -1 1n945b -1 11.12 - 12.28 11.12 - 12.28 11.12 - 12.28 7.5 7.5 7.5 30 30 30 15 15 15 4 9 12 0 to +75 -5 5 to +100 - 55 to +150 0.0005 0.0005 0.0005 *jedec registered data. notes: 1. measured by superimposing 0.75 ma ac rms on 7.5 ma dc @ 25 o c. 2. the maximum allowable change observed over the entire temperature range i.e., th e diode voltage will not exceed the specified mv change at any discrete temperature between the established limits. 3. voltage measurements to be performed 15 seconds after application of dc current. 4. the 1n941b -1 , 1n943b -1 , 1n944b -1 , and 1n945b -1 only are military qualifi ed to mil - prf - 19500/157 up to the jan s level. downloaded from: http:///
lds - 0222, rev . 1 (111515) ?2011 microsemi corporation page 4 of 6 1n941 -1 thru 1n945b -1 graphs i z C operating current (ma) figure 1 typical change of temperature coefficient with change in operating current i z C operating current (ma) figure 2 typical change of zener voltage w ith change in operating current change in temperature coefficient (%/ o c) change in temperature coefficient (mv/ o c) the curve shown in figure 1 is typical of the diode series and greatly simplifies the estimation of the temperature coefficient (tc) when the diode is operated at currents other than 7.5 ma. example: a diode in this series is operated at a current of 7.5 ma and has specified temperature coefficient (tc) limits of +/ - 0.002 %/ o c . to obtain the typical temperature coefficient limits for this same diode operated at a current of 6.0ma, the new tc limits (%/ o c ) can be estimated using the graph in figure 1. at a test current of 6.0 ma the change in temperature coefficient (tc) is approximately C 0.0009 %. o c . the algebraic sum of +/ - 0.002 % o c and C 0.0009 %/ o c gives the new estimated limits of +0.0011 %/oc and - 0. 0029 %/oc. ? v z C change in zener voltage (mv) this curve in figure 2 illustrates the change of diode voltage arising from the effect of impedance. it is in effect, an exploded view of the zener operating region of the i - v characteristic. in conjunction with figure 1, this curve can be used to estimate total voltage regulation under conditions of both varying temperature and curr ent. downloaded from: http:///
lds - 0222, rev . 1 (111515) ?2011 microsemi corporation page 5 of 6 1n941 -1 thru 1n945b -1 graphs 600 500 400 300 200 100 0 0 25 50 75 100 125 150 175 t l , ambient temperature (c) figure 3 power derating curve o perating current l zt (ma) figure 4 typical zener impedance vs. operating current p d , rated power dissipation (mw) z ener impedance z zt (ohms) downloaded from: http:///
lds - 0222, rev . 1 (111515) ?2011 microsemi corporation page 6 of 6 1n941 -1 thru 1n945b -1 package dimensions symb ol dimen sio ns notes inch milli m eters min max min max bd 0 .60 0 0 .107 1.52 2.72 3 bl 0 .120 0 .300 3.05 7.62 3 ld 0 .018 0 .023 0.46 0.58 ll 1.000 1.500 25.40 38.10 ll 1 0 .050 1.27 4 no t es: 1. dimens i ons are in in c hes. 2. millimeters are gi v en for g ene r al infor m ation only. 3. package c o ntour opt ional with in b d and l ength bl. h ea t slugs, if a ny, shall be in cl uded w it h in this cyl in d er but s h all n ot be su bje ct to minimum limit of bd. 4. within this zone, l e ad d ia m eter m ay vary t o al low for le ad finishes a nd ir r eg u larit i es, ot he r than h e at slugs. 5. in accorda n ce wit h asme y14.5m, dia me ters are eq u iv a lent to x sym bo log y. downloaded from: http:///
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