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| 1280G, 1285G Vishay Foil Resistors Bulk Metal(R) Foil Technology Precision Trimming Potentiometers 3/4 Inch Rectilinear, 5ppm/C and 15ppm/C TCR FEATURES * Temperature Coefficient of Resistance (TCR): 15ppm/C (Model 1280G); 5ppm/C (Model 1285G)4 (- 55C to + 125C Ref @ + 25C); Through the wiper 50ppm/C * Load Life Stability: 0.5% Maximum DR under Full Rated Power @ + 25C for 2,000 hours * Settability: 0.05% Typical; 0.1% Maximum * Setting Stability: 0.1% Typical; 0.5% Maximum, DSS * Power Rating: 0.75 watts @ + 25C * Resistance Range: 10W to 20KW * Resistance Tolerance: 10%, 5 % * Backlash: < 0.05% * Tap Test: 0.05% Typical; 0.1% Maximum Product may not be to scale TABLE 1 - 1280G AND 1285G SERIES ELECTRICAL SPECIFICATIONS Resistance Tolerance Resistance Range T.C.R. Model 1280G T.C.R. Model 1285G 4 TABLE 2 - 1280G AND 1285G SERIES MECHANICAL SPECIFICATIONS Adjustment Turns Backlash Stops Sealed Torque Weight Construction Case Material Lead Screw Wiper Rider Block Element Lead Material Valox(R) Brass Precious Metal Brush Nylon Bulk Metal(R) Foil Gold Plated Phosphor Bronze 26 2 turns < 0.05% clutch, wiper idles + 85C water immersion 5oz. in. Maximum 1.5 grams Maximum Model 1280G 10%1 Model 1285G 5% 10W to 20KW 15ppm/C (- 55C to + 25C) 15ppm/C (+ 25C to + 125C) 5ppm/C (- 55C to + 25C) 5ppm/C (+ 25C to + 125C) 0.75W @ +25C derated linearly to zero watts @ + 125C (See Fig. 2) 0.05% Typical ; 0.1% Maximum 0.1% Typical; 0.5% Maximum, DSS 0.25% Typical; 1.0% Maximum 0.5% DR after 2000 hours under Full Rated Power @ + 25C 2W Maximum 3W Typical; 10W Maximum 10ns rise time @ 1KW to 100MHz 2 TRIMMERS Power Settability Setting Stability Roll-on, Roll-off Load-Life Stability End Resistance C.R.V. 3 TABLE 3 - STANDARD VALUES 10W, 20W, 50W, 100W, 200W, 500W 1K, 2K, 5K, 10K, 20K Frequency Characteristics NOTES: 1. 5% Available on Special Order. 2. Typical is a designer's reference which represents that 85% of the units supplied over a long period of time, will be at least the figure shown or better. 3. The 1280G can be screened for low noise, if required. 4. For model 1285G 10 ohms and 20 ohms TCR is 10ppm/C 5. Panel mount available on special order. VISHAY FOIL * FRANCE +33.4.93.37.28.24 FAX: +33.4.93.37.27.31 * GERMANY +49.9287.710 FAX: +49 9287.70435 * ISRAEL +972.3.557.0945 FAX: +972.3.558.9121 TABLE 4 - ORDERING INFORMATION 1280G/1285GSERIES PARTS Please specify Vishay Model 1280G/1285G Precision Trimming Potentiometers as follows: Example: 10% 100R 1280G MODEL NO. RESISTANCE VALUE TOLERANCE * ITALY + 39.2.300.11919 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 +1 610 407-4800 FAX: +1 610 640-9081 www.vishay.com 166 Document Number: 63056 Revision 02-May-02 1280G, 1285G Bulk Metal Foil Technology Precision Trimming Potentiometers (R) Vishay Foil Resistors FIGURE 1 - 1280G / 1285G SCHEMATIC AND DIMENSIONS in inches (millimeters) 0.750" (19.05mm) C 0.060" (1.52mm) A 0.190" (4.83mm) B 0.010" (0.25mm) A 0.050" (1.27mm) A 0.039" (0.99mm) A 0.020" (0.51mm) A 0.110" (2.79mm) A 0.270" (6.86mm) B 0.190" (4.83mm) B 1 2 3 0.200" (5.08mm) B 0.030" (0.76mm) A 0.010" (0.25mm) A 0.100" (2.54mm) B 0.200" (5.08mm) A 0.500" (12.70mm) A 0.125" (3.18 mm) B 1 CW 0.030" (0.76mm) A 2 3 TOLERANCES A = 0.005" (0.13mm) B = 0.010" (0.25mm) C = 0.015" (0.38mm) TRIMMERS FIGURE 2 - POWER DERATING CURVE Percent of Rated Power +100 +75 +50 +25 0 -75 -55C +25C -50 -25 0 +25 +50 +75 +100 +125 +150 Ambient Temperature C VISHAY FOIL * FRANCE +33.4.93.37.28.24 FAX: +33.4.93.37.27.31 * GERMANY +49.9287.710 FAX: +49 9287.70435 * ISRAEL +972.3.557.0945 FAX: +972.3.558.9121 * ITALY + 39.2.300.11919 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 +1 610 407-4800 FAX: +1 610 640-9081 Document Number: 63056 Revision 02-May-02 www.vishay.com 167 |
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