NT73 negative tempco thermistor features circuit protection * * * * * Anti-leaching nickel barrier terminations 90/10 solder plated terminations, standard Twelve standard resistance values Suitable for reflow and wave soldering Marking: Black three-digit on pink body color dimensions and construction L c Type c (Inch Size Code) W Solder Plating Ni Plating t d Protective Coating L Dimensions inches (mm) W c d t 1J (0603) .063.008 .031.004 .012.004 .012.004 (1.60.2) (0.80.1) (0.30.1) (0.30.1) .02.004 (0.50.1) 2A (0805) .079.008 .049.004 .016.008 (2.00.2) (1.250.1) (0.40.2) .012 +.008 -.004 +0.2 ) -0.1 +.008 -.004 (0.5 +0.2 -0.1 ) 2B (1206) .126.008 .063.008 (3.20.2) (1.60.2) .016 +.008 -.004 +0.2 ) -0.1 .024.004 (0.60.1) .02.008 (0.50.3) Resistive Inner Film Electrode (0.3 (0.4 .02 Ceramic Substrate ordering information Old Part # NT73 2A New Part # NT73 2A L Size Code 1J: 0603 2A: 0805 2B: 1206 Termination Material L: SnPb T: Sn Type T 103 K TD 103 K 3800 J Nominal Resistance 2 significant figures + 1 multiplier Resistance Tolerance J: 5% K: 10% L: 15% B Constant Nominal 3200 3500 3800 B Constant Tolerance J: 5% K: 10% Packaging TD: 7" paper tape (5,000 pieces/reel) For further information on packaging, please refer to Appendix A. Specifications given herein may be changed at any time without prior notice. Please confirm technical specifications before you order and/or use. 144 11/01/03 KOA Speer Electronics, Inc. * Bolivar Drive * P.O. Box 547 * Bradford, PA 16701 * USA * 814-362-5536 * Fax: 814-362-8883 * www.koaspeer.com NT73 negative tempco thermistor applications and ratings Resistance @ 25C 6.8k 10k 15k 20k 22k 30k 33k 47k 68k 100k 1.0k 2.0k 2.2k 2.4k 3.3k 4.7k 5.0k 6.8k 10k 10k 15k 20k 22k 30k 33k 47k 68k 100k 150k 1.0k 2.2k 3.3k 4.7k 6.8k 10k 22k 33k 47k 68k 100k NEW NT731J NT732A NT732B Resistance Tolerance B Constant @ 25C/75C J: 5% K: 10% K: 10% L: 15% Resistance () 5 2.8 5 3 5 10% 3500K 3800K 3500K J: 5% K: 10% L: 15% -55C to +125C 5% 3800K 3200K K: 10% L: 15% J: 5% K: 10% L: 15% 10% 3500K 3800K 5% RT/R25 Ratio vs. B Constant Temperature (C) 100,000 10,000 100k 1,000 10k 100 1k 25 50 75 Temperature (C) 2 Operating Temperature Range 3200K 1,000,000 0 Power Rating (mW) 5% 3800K 10,000,000 -25 Thermal Dissipation Constant (mW/C) 10% 3500K 3800K environmental applications Temperature Characteristics 10 -50 B Constant Tolerance circuit protection Part Designation 100 125 -55 -50 -45 -40 -35 -30 -25 -20 -15 -10 -5 0 5 10 15 20 25 30 35 B Constant (K) Temperature (C) B Constant (K) 3200 3500 3800 3200 3500 3800 51.45 37.02 27.03 20.00 14.99 11.36 8.71 6.75 5.28 4.17 3.33 2.67 2.17 1.77 1.45 1.20 1.00 0.838 0.706 74.45 51.94 36.82 26.48 19.32 14.27 10.68 8.08 6.18 4.77 3.72 2.93 2.33 1.86 1.50 1.22 1.00 0.824 0.683 107.72 72.87 50.15 35.07 24.90 17.92 13.08 9.66 7.22 5.46 4.17 3.21 2.50 1.97 1.56 1.24 1.00 0.810 0.661 40 45 50 55 60 65 70 75 80 85 90 95 100 105 110 115 120 125 0.598 0.509 0.436 0.375 0.323 0.281 0.244 0.214 0.188 0.165 0.146 0.130 0.115 0.103 0.092 0.083 0.075 0.067 0.570 0.478 0.403 0.342 0.291 0.249 0.214 0.185 0.160 0.140 0.122 0.107 0.094 0.083 0.074 0.066 0.058 0.052 0.543 0.448 0.373 0.312 0.262 0.221 0.188 0.160 0.137 0.118 0.102 0.088 0.077 0.067 0.059 0.052 0.046 0.041 Note: RT/R25 ratio is the resistance at temperature (T) divided by the nominal resistance at 25C. The RT/R25 ratio value is multiplied by the thermistor's nominal 25C value to determine the nominal resistance value at a given temperature in the chart above. Performance Characteristics Parameter High Temperature Exposure Resistance to Solder Heat Terminal Strength-Bend Moisture Resistance Life Temperature Cycling Dielectric Withstanding Voltage 2A 2B Insulation Resistance Maximum R 3.0% 1.0% 1.0% 3.0% 3.0% 3.0% 400V 400V 10,000 M Minimum Test Method 1000 hours @ 80C MIL-R-55342 4.7.7, 260C for 10 seconds 2mm min. deflection in either direction for 10 seconds MIL-STD-202, Method 103, 40C, 90 - 95% RH, 1000 hours 80C, DC 5mm, 1000 hours 30 minutes @ -55C, 15 minutes @ +25C, 30 minutes @ +125C, 15 minutes @ +25C, 50 cycles 1 minute minimum MIL-STD-202, Method 301 -- Specifications given herein may be changed at any time without prior notice. Please confirm technical specifications before you order and/or use. 11/24/03 KOA Speer Electronics, Inc. * Bolivar Drive * P.O. Box 547 * Bradford, PA 16701 * USA * 814-362-5536 * Fax: 814-362-8883 * www.koaspeer.com 145