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| 1268 Vishay Foil Resistors Bulk Metal(R) Foil Technology Precision Trimming Potentiometers 3/8 Inch Square, RJ24 Style - Industrial Trimmer FEATURES * Temperature Coefficient of Resistance (TCR): 20ppm/C Max2. (- 55C to + 150C Ref. @ 25C); Through the wiper3; 50ppm/C Product may not be to scale * Load Life Stability: 0.1% Typical R, 1.0% Maximum R under Full Rated Power @ + 85C for 1000 Hours * Settability: 0.1% * Setting Stability: 0.1% Typical1; 0.5% Maximum1, SS * Power Rating4: 0.25 watts @ + 85C * Resistance Range: 20 to 5K * Resistance Tolerance: 10% TABLE 1 - MODEL SELECTION * MODEL 1268 TERMINATION STYLE W-Edge Mount, Top Adjust 0.4 X-Edge Mount, Side Adjust *See Figure 1, next page. AVERAGE WEIGHT (g) STANDARD RESISTANCE VALUES STANDARD POWER RATING @ NO. OF (in ) TOLERANCES + 85C AMBIENT TURNS 20, 50, 100, 200, 500, 1K 2K, 5K 10% 0.25W 21 2 NOTES: 1. Maximum is 1.0% A.Q.L. standard for all specifications except TCR. (For TCR information see notes 2 and 3). "Typical" is a designers reference which represents that 85% of the lots supplied, over a long period of time, will be at least the figure stated or better. 2. Maximum TCR applies to the 3 (sigma) limit or 99.73% of a production lot. (Measured end-to-end with wiper off the element.) 3. Measurements of TCR through the wiper are influenced more by setting stability and the percentage of the total resistance in use (at the wiper) than by fundamental resistance change due to temperature alone. The parameter shown is a 2 distribution typifying the behavior of the device when used with 40% or more of the total resistance in use. 4. Derated linearly from full power @ + 85C to zero (0) watts @ + 150C. See Figure 2, next page. 5. Independent of resistance value 3 ohms maximum available on special request. Special Available Options: Special marking Burn-in and screening operations TRIMMERS ADDITIONAL SPECIFICATIONS: * Contact Resistance Variation - CRV (noise): 10 ohms Maximum5 * Hop-off: 0.25% Typical; 1.0% Maximum * Operating Temperature Range: - 55C to + 150C * Adjustment Turns: 21 2 * Mechanical Stops: Wiper Idles - No Discontinuity 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 2 - ORDERING INFORMATION - 1268 SERIES PARTS Please specify Vishay Model 1268 Precision Trimming Potentiometers as follows: Example: 1268 MODEL NO. W TERMINATION STYLE 100R RESISTANCE VALUE 10% TOLERANCE See Table 1 for details. See Figure 1, next page for Standard Marking. * 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: 63059 Revision 06-Aug-02 www.vishay.com 161 1268 Vishay Foil Resistors Bulk Metal(R) Foil Technology Precision Trimming Potentiometers FIGURE 1 - SCHEMATIC AND DIMENSIONS in inches (millimeters) 1268W 0.081 0.010" (2.08 0.25mm) 0.080" (2.03mm) MAX MAXIMUM VISHAY 0.420" (10.67mm) MAXIMUM MAX 0.015" (0.38mm) MIN MINIMUM CW 0.300" (7.62mm) MIN MINIMUM 3 1 2 3 PINS 0.024 0.006" (0.61 0.15mm) DIA DIAMETER 0.090 0.005" (2.29 0.13mm) DIA 0.010" (0.25mm) C 0.100 0.005" (2.54 0.13mm) 0.187 0.020" (4.75 0.51mm) 0.170 0.025" (4.32 0.64mm) 0.075 0.010" (1.91 0.25mm) STANDARD MARKING Model No. Date Code Resistance Value Tolerance 0.375 0.015" (9.53 0.38mm) 1268X 0.080" (2.03mm) MAX MAXIMUM 0.081 0.010" (2.08 0.25mm) 0.420" (10.67mm) MAX VISHAY 2 CW MAXIMUM 0.015" (0.38mm) MIN NOTES Adjustment screw 0.090 Inches (2.30mm) diameter with 0.020 Inches (0.51mm) x 0.031 Inches (0.80mm) slot. Model 1268 has solder plated copper terminal pins. 0.024 Inches (0.61mm) diameter, 0.300 Inches (7.62mm) length minimum. 3 TRIMMERS MINIMUM 0.300" (7.62mm) MIN MINIMUM 1 3 PINS 0.024 0.006" (0.61 0.15mm) DIA DIAMETER 0.010" (0.25mm) C 0.100 0.005" (2.54 0.13mm) 0.187 0.020" (4.75 0.51mm) 0.170 0.025" (4.32 0.64mm) 0.075 0.010" (1.91 0.25mm) 0.090 0.005" (2.29 0.13mm) DIA 0.375 0.015" (9.53 0.38mm) FIGURE 2 - POWER DERATING CURVE +85C Percent of Rated Power +100 +75 +50 +25 0 -75 -50 -25 0 +25 +50 +75 +100 +125 +150 +175 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 www.vishay.com 162 Document Number: 63059 Revision 06-Aug-02 |
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