document number: 61015 revision 07-aug-01 www.vishay.com 68 CTA vishay electro-films chip resistors vishay electro-films ?france +33.4.93.37.28.24 fax: +33.4.93.37.27.31 ?germany +49.9287.710 fax: +49 9287.70435 ?israel +9 72.3.557.0945 fax: +972.3.558.9121 ?italy + 39.2.300.11911 fax: +39.2.300.11999 ?japan +81.42.729.0661 fax: +81.42.729.3400 ?singapore +65.788.6668 fax: +65. 788.0988 ?sweden +46.8.594.70590 fax: +46.8.594.70581 ?uk +44 191 514 8237 fax: +44 1953 457 722 ?usa: (401) 738-9150 fax: (401) 738 -4389 tightest standard tolerance available 0.1% 25 ? 100 ? 200 ? 20k ? 35k ? thin film, center-tapped resistors features center tap feature tight ratio tolerances to: 0.1% chip size: 0.030 inches square resistance range total: 25 ? to 35k ? alumina substrate, low shunt capacitance: < 0.2pf resistor material nichrome excellent stability: 0.025% maximum ? r/r the CTA series resistor chips combine the best tolerances, stability and low shunt capacitance . the CTA offers the designer flexibility in use as either a single value resistor or as two resistors with a center tap feature. the CTAs six bonding pads allows the user increased layout flexibility . the CTAs are manufactured using vishay electro-films (efi) sophisticated thin film equipment and manufacturing technology. the CTAs are 100% electrically tested and visually inspected to mil-std-883. parameter tcr tracking between halves (r a , r b ) 2ppm/ c* center tap ratio, r a /r b tolerance 1 1% standard noise, mil-std-202, method 308 - 35db typical moisture resistance, mil-std-202 method 106, (passivated only) 0.5% maximum ? r/r stability, 1000 hours, + 125 c, 62mw 0.025% maximum ? r/r operating temperature range - 55 c to + 125 c thermal shock, mil-std-202, method 107, test condition f 0.1% maximum ? r/r high temperature exposure, + 150 c, 100 hours 0.1% maximum ? r/r insulation resistance 10 12 minimum operating voltage 100v maximum dc power rating at + 70 c (derated to zero at + 150 c) 125mw 5 x rated power short-time overload, + 25 c, 5 seconds 0.25% maximum ? r/r standard electrical specifications applications the CTA center-tapped resistor chips are used mainly in feedback circuits of amplifiers where ratio matching, low shunt capacitance and tracking between two resistors is critical. recommended for hermetic environments where chip is not exposed to moisture. for lower values, the resistance of the six bonding-pad configurations can vary, depending on the method of measurement used. vishay efi measures low-value resistors by the four-wire kelvin technique. the measuring method is illustrated in the diagram to the right. *10ppm/ c for r < 100 i i i v v v r a r b process code class h* class k* 202 232 200 230 201 231 *mil-prf-38534 product may not be to scale temperature coefficient of resistance, values and tolerances 100ppm/ c 50ppm/ c 25ppm/ c
www.vishay.com 69 CTA vishay electro-films document number: 61015 revision 07-aug-01 chip resistors vishay electro-films ?france +33.4.93.37.28.24 fax: +33.4.93.37.27.31 ?germany +49.9287.710 fax: +49 9287.70435 ?israel +9 72.3.557.0945 fax: +972.3.558.9121 ?italy + 39.2.300.11911 fax: +39.2.300.11999 ?japan +81.42.729.0661 fax: +81.42.729.3400 ?singapore +65.788.6668 fax: +65. 788.0988 ?sweden +46.8.594.70590 fax: +46.8.594.70581 ?uk +44 191 514 8237 fax: +44 1953 457 722 ?usa: (401) 738-9150 fax: (401) 738 -4389 parameter chip size 0.030 x 0.030 0.002 (0.762 x 0.762 0.050mm) chip thickness 0.010 0.002 (0.254 0.05mm) chip substrate material 99.6% alumina resistor material nichrome bonding pads 0.005 x 0.005 (0.127 x 0.127mm) number of pads 6 pad material 25k? minimum gold backing none mechanical specifications in inches dimensions in inches options: aluminum bonding pads, 10k? minimum center-tap ratio tolerances to 0.02%, r > 1k ? consult applications engineer thin film, center-tapped resistors standard configuration *six locations. all pads 0.005 x 0.005 schematic r t = r a + r b r a r b 0.030 0.030 example: 100% visualled, 10k ? , 1%, 100ppm/ c tcr, gold pads, class h p/n: w CTA 201 1000 1 f inspection product process resistance multiplier tolerance /packaging family code value code code w = 100% visually see process code use first 4 b = 0.01 a =0.05% inspected parts in table significant digits a = 0.1 b =0.1% matrix tray per mil-std-883 of resistance (r t ) 0 = 1 c =0.2% x = sample, visually 1 = 10 d = 0.5% inspected loaded in matrix f = 1.0% trays (4% aql) g = 2.0% h = 2.5% j = 5.0% k = 10% m = 20% l = 25% ordering information 0.005
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