9.0 volt temperatur e compensated zener reference diodes www. microsemi . com scottsdale division 1n935 thru 1n940b-1, e3 1n935 - 1n940b-1, e3 description appearance the popular 1n935 thru 1n940b series of zero-tc reference diodes provides a selection of 9.0 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. these glass axia l-leaded do-7 reference diodes are also available in jan, jantx, and jantxv military qualifications. for commercial applications it is also available as rohs compliant with an e3 suffix (not applicable to military). microsemi also offers numerous other zener reference diode products for a va riety of other voltages from 6.2 v to 200 v. do-7 (do-204aa) important: for the most current data, consult microsemi?s website: http://www.microsemi.com features applications / benefits ? jedec registered 1n935 thru 1n940 series ? standard reference voltage of 9.0v +/- 5% ? 1n935b, 937b, 938b, 939b, 940b also have military qualification to mil-prf-19500/156 up to the jantxv level by adding jan, jantx, or jantxv prefixes to part numbers as well as ?-1? suffix, e.g. jantx1n938b-1, etc. ? internal metallurgical bonds ? jans equivalent available via scd ? radiation hardened devices available by changing ?1n? prefix to ?rh?, e.g. rh938b, rh 940b, etc. also consult factory for ?rh? data sheet brochure ? rohs compliant devices available by adding an ?e3? suffix (not applicable to military) ? 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 0.0002%/oc ? tight voltage tolerances available with nominal voltage of 9.2 v by adding tolerance 1%, 2%, 3%, etc. after the part number for fu rther identification, e.g. 1n938b-2%, 1n940b-1%, 1n939b-1-1%, etc. ? flexible axial-leaded mounting terminals ? nonsensitive to esd per mil-std-750 method 1020 maximum ratings mechanical and packaging ? operating & storag etemperature: -65 o c to +175 o c ? dc power dissipation: 500 mw @ t l = 25 o c and maximum current i zm of 50 ma. note: for optimum voltage-temperature stability, i z = 7.5 ma (less than 75 mw in dissipated power) ? solder temperatures: 260 o c for 10 s (maximum) ? case: hermetically sealed glass case with do-7 (do-204aa) package ? terminals: tin-lead (military) or rohs compliant annealed matte-tin plating and solderable per mil-std-750, method 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 (add ?tr? suffix to part number) ? weight: 0.2 grams. ? see package dimensions on last page microsemi scottsdale division page 1 copyright ? 2005 7-18-2005 rev b 8700 e. thomas rd. po box 1390, scottsdale, az 85252 usa, (480) 941-6300, fax: (480) 947-1503
9.0 volt temperatur e compensated zener reference diodes www. microsemi . com scottsdale division 1n935 thru 1n940b-1, e3 1n935 - 1n940b-1, e3 *electrical characteristics @ 25 o c, unless otherwise specified zener voltage v z @ i zt (notes 1, 4 & 5) zener test current i zt maximum zener impedance (note 2) z zt @ i zt maximum reverse current i r @ 6 v voltage temperature stability (notes 3 & 4) v zt maximum temperature range effective temperature coefficient vz jedec type numbers (notes 1 & 5) volts ma ohms a mv o c %/ o c 1n935 1n935a 1n935b 8.55-9.45 8.55-9.45 8.55-9.45 7.5 7.5 7.5 20 20 20 10 10 10 67 139 184 0 to +75 -55 to +100 -55 to +150 0.01 0.01 0.01 1n936 1n936a 1n936b 8.55-9.45 8.55-9.45 8.55-9.45 7.5 7.5 7.5 20 20 20 10 10 10 33 69 92 0 to +75 -55 to +100 -55 to +150 0.005 0.005 0.005 1n937 1n937a 1n937b 8.55-9.45 8.55-9.45 8.55-9.45 7.5 7.5 7.5 20 20 20 10 10 10 13 27 37 0 to +75 -55 to +100 -55 to +150 0.002 0.002 0.002 1n938 1n938a 1n938b 8.55-9.45 8.55-9.45 8.55-9.45 7.5 7.5 7.5 20 20 20 10 10 10 6 13 18 0 to +75 -55 to +100 -55 to +150 0.001 0.001 0.001 1n939 1n939a 1n939b 8.55-9.45 8.55-9.45 8.55-9.45 7.5 7.5 7.5 20 20 20 10 10 10 3 7 9 0 to +75 -55 to +100 -55 to +150 0.0005 0.0005 0.0005 1n940 1n940a 1n940b 8.55-9.45 8.55-9.45 8.55-9.45 7.5 7.5 7.5 20 20 20 10 10 10 1.3 2.7 3.7 0 to +75 -55 to +100 -55 to +150 0.0002 0.0002 0.0002 *jedec registered data. notes: 1 . when ordering devices with tighter tolera nces than specified, use a nominal volt age of 9.2v and add a hyphenated suffix to the part number for desired tolerance at the end of the part number, e.g. 1n938b-2%, 1n939b-1%, 1n939b-1-1%, etc. 2. measured by superimposing 0.75 ma ac rms on 7.5 ma dc @ 25 o c. 3. the maximum allowable change observed over the entire temp erature range i.e., the diode voltage will not exceed the specified mv change at any discrete temperature between the established limits. 4. voltage measurements to be performed 15 seconds after application of dc current. 5. the 1n935b, 937b, 938b, 939b, 940b also have military qualific ation to mil-prf-19500/156 up to the jantxv level by adding jan, jantx, or jantxv prefixes to part numbers as well as ?-1? suffix, e.g. jantx1n938b-1, etc. 6. designate radiation hardened devices with ?rh? pr efix instead of ?in?, i.e. rh938a instead of 1n938a. graphs change in temperature coefficient (mv/ o c) microsemi scottsdale division page 2 copyright ? 2005 7-18-2005 rev b i z ? operating current (ma) change in temperature coefficient (%/ 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 7.5ma. example: a diode in this series is operated at a current of 7.5ma and has specified temperature coefficient (tc) limits of +/- 0.005%/ 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 6.0ma the change in temperature coefficient (tc) is approximately ?0.0009%. o c. the algebraic sum of +/- 0.005% o c and ?0.0009%/ o c gives the new estimated limits of +0.0041%/oc and -0.0059%/oc. figure 1 typical change of temperature coefficient with change in operating current. 8700 e. thomas rd. po box 1390, scottsdale, az 85252 usa, (480) 941-6300, fax: (480) 947-1503
9.0 volt temperatur e compensated zener reference diodes www. microsemi . com scottsdale division 1n935 thru 1n940b-1, e3 1n935 - 1n940b-1, e3 v z ? 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 current. i z ? operating current (ma) figure 2 typical change of zener voltage with change in operating current. dimensions all dimensions in inch mm microsemi scottsdale division page 3 copyright ? 2005 7-18-2005 rev b 8700 e. thomas rd. po box 1390, scottsdale, az 85252 usa, (480) 941-6300, fax: (480) 947-1503
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