t hi n f il m c hi p r esistor s 68 s e r ie s 0 . 020 ?x 0 . 020 ? spectrum microwave 68 series 0 .020? x 0 .020? thin-film chip resistors are available in both top-contact and ba ck-c on t a ct v e rs ion s in several r e s i st an c e s and t ole r an c e s. v alue s a r e a v ailable from 1 ohm to 500 kohms. both pass i vated n i chrome and tanta l um-n i tr i de res i stor vers i ons are available. nichrome provides excellent stability and temperature coefficient in hermetic applications while tantalum-nitride provides superior moisture-resistance for non-hermetic applications . spectrum microwave t el : 508-485-6350 fax : 508-485-516 8 165 cedar hill s t ree t, marlborough , ma 0175 2 www.spectrummicrowave.co m electrical specification s p arame t e r li m i t test condition s p owe r ra t in g 100 m w (derated at 70 to 0 mw @ 150 ) li f e 0 . 2% ma x 1000 hours @ 125 c nois e -35 db ty p mi l -st d - 202 m e t hod 30 8 high temp exposur e 0 . 2% ma x 100 hou rs a t 150 c t cr (68al, 68b cn ) 50 ppm / c - 55 t o 125 c tcr (68alt, 68bcr ) -50 to -120 ppm/ c - 55 t o 125 c operating voltag e 100 vdc ma x moisture resistanc e 0 . 5% ma x mi l -st d - 202 m e t hod 10 6 thermal shoc k 0 . 5% ma x mi l -st d - 202 m e t hod 10 7 values from 20 to 200 ohm s v al u es b elow 20 o h m s value s ab ov e 200 o h m s mechanical specification s substrat e s ili con wi th 1 m i cron therma l ox i d e bond pad metalizatio n gold, 100 microinche s siz e 0.021 x .021 0.002 (0.53 x 0.53 mm 0 .05 mm ) thicknes s 0.013 0.003 (0.33 0.07 mm ) bond pad dimension s 0.004 x .004 minimum (0.1 x 0.1 mm ) pr o t e ct i v e o v e rc oa t ( pa ss i v a t ion ) 0.6 microns sio2 (68al & 68bcn versions only ) back side lapped silicon (68al, 68alt), gold (68bcn, 68bcr ) typical configuration s on back--contact versions, pad without bevel is connected to back side. 0.005 0.020
spectrum microwave also manufactures custom substrates on a variety of materials, a wide range of microwave, pin diode d r i v e rs , and custom hybrid circuits. please contact the factory or your local representative for more information. (speci f ica t ions subjec t t o change wi t hou t no t ice. ) t hi n f il m c hi p r esistor s 68 series 0 . 020?x0 . 020 ? all parts are 100% electrically tested, sample tested per mil-std-38534 section 3.4, and visually inspected to mil-std-883 requirements. chips are supplied in standard 2"x 2" matrix tray packaging . base part cod e 68xxx - 68al (nichrome top-contact ) 68 a l t (t an t alu m- ni tr ide t op - con t ac t ) 68bcn (nichrome back-contact ) 68bcr (tantalum-nitride back - con t ac t ) value (3 digits plus exponent ) nnn e (under 100 ohms, an r indicates th e decimal point location ) t olerance lette r x b = 0 . 1 % c = 0.25 % d = 0 . 5 % f = 1 % g = 2 % j = 5 % k = 10 % m = 20 % o r d er ing exam pl es: 68al-5002f is a 50 kilohm 1% resistor with nichrome metalization . 68alt-75r0j is a 75 ohm 5% resistor with tantalum-nitride metalization . 68bcr-5r10k is a 5.1 ohm 10% back contact resistor with tantalum-nitride metalizatio n. ava il a bilit y a nd li m it a tion s : 68al & 68bcn series are available f rom 2 ohms t o 500 kohm s. 68alt & 68bcr series are available from 1 ohm to 250 kohm s. b tolerance is available above 250 ohm s. c tolerance is available above 100 ohm s. d tolerance is available above 50 ohm s. f tolerance is available above 25 ohm s. g tolerance is available above 12 ohm s. j tolerance is available above 5 ohm s. ordering informatio n
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