12 s , 14 s , 15 s , 17 s , 18 s vishay techno www.vishay.com for technical questions, contact: sfer@vishay.com document number: 68017 30 revision: 22-sep-10 1/4" (6.35 mm) square wirewound trimmers applications wirewound trimmers are particularly useful in those applications where any combination of high power, low temperature coefficient of resistance and/or excellent long term life stability are important design considerations. electrical specifications electrical travel: 22 turns 4 turns resistance range: 10 to 5 k extended range available in non mil-spec product resistance tolerance: 5 % standard closer tolerances available temperature coefficient: (- 65 c to + 150 c) 50 ppm/c power rating: 0.5 w at + 85 c derated to 0 w at + 150 c these specifications exceed mil-spec end resistance: 1 or 2 %, whichever is greater equivalent noise resistance (enr): 100 maximum dielectric (dwv): 1000 v ac at atmospheric pressure these specifications exceed mil-spec insulation resistance: > 100 000 m (500 v dc ) these specifications exceed mil-spec mechanical specifications operating torque: 3 oz.-inches maximum, 17 s and 18 s , 5 oz.-inches maximum, 12 s , 14 s and 15 s rotation: clutch stop, wiper idles weight: 0.935 g maximum resistive element: nickel chromium rotational life: 200 cycles minimum terminal strength: 2 lbs for 10 s features ? precious metal wiper ? 0.25 w to + 85 c ? tcr < 50 ppm/c ? solderable leads ? special configurations available ? military quality at affordable prices environmental specifications temperature limits: - 65 c to + 175 c sealing: fully sealed case (non-hermetic) note (1) other resistances available upon request standard resistance values resistance (1) ( ) nominal resolution (%) 10 1.65 20 1.35 50 1.13 100 0.82 200 0.62 500 0.62 1k 0.49 2k 0.34 5k 0.27 10k 0.21 20k 0.17 25k 0.16 circuit diagram 1 2 3 cw global part number information new global part numbering: 12s500rb (preferred part number format) global model type resistance value packaging 12 = top adjustment screw 14 = side adjustment screw 15 = pc mount 17 = top adjustment screw 18 = side adjustment screw / = continuous rotation s = clutch stop r = decimal k = thousand 100r = 100 5k00 = 5 k b = bulk historical part numbering: 12s501 (will continue to be accepted) 12 s 501 historical model type resistance value s50 rb 0 12
12 s , 14 s , 15 s , 17 s , 18 s 1/4" (6.35 mm) squar e wirewound trimmers vishay techno document number: 68017 for technical questions, contact: sfer@vishay.com www.vishay.com revision: 22-sep-10 31 notes (1) numbers in parenthesis refer to test method mil-std-202 as modified by the detail specification. (2) for values below 100 , add 0.05 to the allowable change. (3) the referenced tests also require that setting stability change shall not exceed 1.0 % plus the specified maximum resolution and operating torque shall not exceed 150 % of the specified maximum. dimensions 1/4" (6.35 mm) square in inches (millimeters) w lead style - 17 s 123 0.030 0.010 (0.762 0.254) 0.100 0.005 (2.54 0.127) 0.100 0.005 (2.54 0.127) 0.038 0.005 (0.965 0.127) 0.016 0.001 (0.406 0.025) dia. 0.020 0.003 (0.508 0.076) 0.045 0.005 (1.14 0.127) 0.172 (4.37) min. 0.020 0.003 (0.508 0.076) 0.260 0.005 (6.60 0.127) 0.211 0.005 (5.36 0.127) 0.120 0.005 (3.05 0.127) 0.062 0.005 (1.57 0.127) dia. 0.160 0.010 (4.06 0.254) x lead style - 18 s 0.100 0.005 (2.54 0.127) 0.038 0.005 (0.965 0.127) 0.100 0.005 (2.54 0.127) 0.030 0.010 (0.762 0.254) 0.211 0.005 ( 5.36 0.127) 0.062 0.005 (1.57 0.127) 0.120 0.005 (3.05 0.127) 0.160 0.010 (0.406 0.254) 0.172 (4.37) min. 0.260 0.005 (6.60 0.127) 0.045 0.005 (1.14 0.127) 0.016 0.001 (0.406 0.025) dia. 0.020 0.003 (0.508 0.076) 0.020 0.003 (0.508 0.076) p lead style - 15 s 0.082 (2.08) 0.050 0.010 (1.27 0.254) 0.250 0.015 (6.35 0.381) 0.125 (3.17) 0.100 (2.54) 0.100 (2.54) 0.014 (0.356) min. 0.055 0.010 (1.40 0.254) 0.020 (0.508) 2 1 3 0.062 0.002 (1.57 0.051) dia. 0.020 0.0015 (0.508 0.038) dia. 0.180 0.015 (4.57 0.381) 1.72 (4.37) min. 0.156 (3.96) w lead style - 12 s 0.120 0.010 (3.05 0.254) 0.156 0.010 (3.96 0.254) 0.062 0.002 (1.57 0.051) dia. 0.038 (0.965) 0.100 (2.54) 0.013 0.001 (0.330 0.025) dia. 0.020 (0.508) 0.250 0.015 (6.35 0.381) 0.014 (0.356) min. 0.172 (4.37) min. 0.050 0.010 (1.27 0.254) 1 2 3 x lead style - 14 s 0.062 0.002 (1.57 0.051) dia. 0.120 0.010 (3.05 0.254) 0.156 0.010 (3.96 0.254) 0.038 (0.965) 0.100 (2.54) 0.014 (0.356) min. 0.172 (4.37) min. 0.020 (0.508) 0.210 (5.33) 0.013 0.001 (0.330 0.025) dia. 0.050 0.010 (1.27 0.254) 0.250 0.015 (6.35 0.381) 3 2 1 environmental performance test (1) conditions mil-r-27208 requirement typical change thermal shock (107) 5 cycles, - 55 c to + 125 c r 1.0 % (2) r < 0.02 % low temperature operation 1 h storage, 45 min rated power at - 55 c r 1.0 % (2)(3) r < 0.01 % high temperature exposure 250 h, no load at + 150 c r 1.0 % (2)(3) r < 0.03 % moisture resistance (106) 240 h at rated power with humidity ranging from 80 % rh to 98 % rh r 1.0 % (2) r < 0.02 % resistance to soldering heat (210) + 350 c for 3 s r 1.0 % (2) r < 0.01 % shock (213) 18 shocks, 100 g, 6 ms, sawtooth, 3 axes r 1.0 % (2)(3) r < 0.07 % vibration (204) 10 hz to 2000 hz, 20 g, 12 h, 3 axes r 1.0 % (2)(3) r < 0.02 % rotational life 200 cycles r 2.0 % r < 0.04 % load life (108) 1000 h at rated power at + 85 c r 2.0 % r < 0.12 % derating 0 25 50 75 85 100 125 150 175 w 0.50 0.40 0.30 0.20 0.10 ambient temperature c
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