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| Models 12S, 14S, 15S, 17S, 18S Vishay Techno 1/4" [6.35mm] Sq. Wirewound Trimmers FEATURES * * * * * * Precious metal wiper. 0.25 watt to + 85C. TCR < 50PPM/C. Solderable leads. Special configurations available. Military quality at affordable prices. 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. STANDARD RESISTANCE VALUES RESISTANCE* (Ohms) 10 20 50 100 200 500 1k 2k 5k 10k 20k 25k *Other resistances available upon request. NOMINAL RESOLUTION (%) 1.65 1.35 1.13 .82 .62 .62 .49 .34 .27 .21 .17 .16 ELECTRICAL SPECIFICATIONS Electrical Travel: 22 4 turns. Resistance Range: 10 ohms to 5 kilohms. Extended range available in non MIL-Spec product. Resistance Tolerance: 5% standard. Closer tolerances available. Temperature Coefficient: (- 65C to + 150C) 50PPM/C. Power Rating: 0.5 watt at + 85C derated to 0 watt at + 150C. These specifications exceed MIL-Spec. End Resistance: 1 ohm or 2%, whichever is greater. Equivalent Noise Resistance (ENR): 100 ohms maximum. Dielectric (DWV): 1000 VAC at atmospheric pressure. These specifications exceed MIL-Spec. Insulation Resistance: > 100,000 Megohms (500 VDC). These specifications exceed MIL-Spec. MECHANICAL SPECIFICATIONS Operating Torque: 3 ounce inch maximum, 17s and 18s. 5 ounce inch maximum, 12S, 14s and 15s. Rotation: Clutch stop, wiper idles. Weight: 0.935 grams maximum. Resistive Element: Nickel chromium. Rotational Life: 200 cycles minimum. Terminal Strength: 2 pounds for 10 seconds. CIRCUIT DIAGRAM 1 CW 2 3 ENVIRONMENTAL SPECIFICATIONS Temperature Limits: - 65C to + 175C. Sealing: Fully sealed case (non-hermetic). DIMENSIONAL CONFIGURATIONS 1/4" [6.35mm] Square [Numbers in brackets indicate millimeters] W Lead Style - 17S .038 .005 [.965 .127] .020 .003 [.508 .076] .045 .005 [1.14 .127] .260 .005 [6.60 .127] .172 [4.37] Min. .016 .001 [.406 .025] Dia. .120 .005 [3.05 .127] .062 .005 [1.57 .127] Dia. .100 .005 [2.54 .127] .211 .005 [5.36 .127] .160 .010 [4.06 .254] .030 .010 [.762 .254] .100 .005 [2.54 .127] X Lead Style - 18S .045 .005 [1.14 .127] .260 .005 [6.60 .127] .172 [4.37] Min. .016 .001 [.406 .025] Dia. .020 .003 [.508 .076] .020 .003 [.508 .076] .160 .010 [.406 .254] .062 .005 [1.57 .127] .211 .005 [5.36 .127] .120 .005 [3.05 .127] .020 .003 [.508 .076] 123 .030 .010 [.762 .254] .038 .005 [.965 .127] .100 .005 [2.54 .127] .100 .005 [2.54 .127] www.vishay.com 28 Document Number 68017 Revision 23-Sep-99 Models 12S, 14S, 15S, 17S, 18S Vishay Techno DIMENSIONAL CONFIGURATIONS 1/4" [6.35mm] Square [Numbers in brackets indicate millimeters] P Lead Style - 15S .180 .015 [4.57 .381] .062 .002 [1.57 .051] Dia. .156 [3.96] 1.72 [4.37] Min. .020 .0015 [.508 .038] Dia. .020 [.508] .082 [2.08] 3 .055 .010 [1.40 .254] .050 .010 [1.27 .254] .125 [3.17] 1 2 .020 [.508] .014 [.356] Min. .172 [4.37] Min. .014 [.356] Min. W Lead Style - 12S .156 .010 [3.96 .254] .120 .010 [3.05 .254] .100 [2.54] .062 .002 [1.57 .051] Dia. .050 .010 [1.27 .254] .250 .015 [6.35 .381] .013 .001 [.330 .025] Dia. 1 2 3 .038 [.965] .100 [2.54] .250 .015 [6.35 .381] .100 [2.54] X Lead Style - 14S .062 .002 [1.57 .051] Dia. .050 .010 [1.27 .254] .250 .015 [6.35 .381] .120 .010 [3.05 .254] .210 [5.33] .020 [.508] .014 [.356] Min. 3 2 1 .038 [.965] .156 .010 [3.96 .254] .013 .001 [.330 .025] Dia. .172 [4.37] Min. .100 [2.54] ENVIRONMENTAL PERFORMANCE TEST1 Thermal Shock Low Temperature Operation High Temperature Exposure Moisture Resistance Resistance to Soldering Heat Shock Vibration Rotational Life Load Life 1 2 CONDITIONS (107) 5 cycles, - 55C to + 125C 1 hour storage, 45 minutes rated power at - 55C 250 hours, no load at + 150C (106) (210) (213) (204) (108) 240 hours at rated power with humidity ranging from 80% RH to 98% RH + 350C for 3 seconds 18 shocks, 100g, 6 ms, sawtooth, 3 axes 10 to 2000 Hz, 20g, 12 hours, 3 axes 200 cycles 1000 hours at rated power at + 85C MIL-R-27208 REQUIREMENT R 1.0%2 R 1.0%2, 3 R 1.0%2, 3 R 1.0% 2 TYPICAL CHANGE R < 0.02% R < 0.01% R < 0.03% R < 0.02% R < 0.01% R < 0.07% R < 0.02% R < 0.04% R < 0.12% R 1.0%2 R 1.0%2, 3 R 1.0% R 2.0% R 2.0% 2, 3 Numbers in parenthesis refer to test method MIL-STD-202 as modified by the detail specification. For values below 100 ohms, add 0.05 ohm to the allowable change. 3 The referenced tests also require that setting stability change shall not exceed 1.0 percent plus the specified maximum resolution and operating torque shall not exceed 150% of the specified maximum. DERATING 0.50 WATTS 0.40 0.30 0.20 0.10 0 25 50 75 85 100 125 150 175 AMBIENT TEMP. DEG. CENTIGRADE HOW TO ORDER 12S MODEL 12S = Top Adjustment Screw 14S = Side Adjustment Screw 15S = PC Mount 17S = Top Adjustment Screw 18S = Side Adjustment Screw 501 VALUE First two digits are significant figures. Last digit specifies number of zeros to follow. Document Number 68017 Revision 23-Sep-99 www.vishay.com 29 |
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