1268 VISHAY

Document overview

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  • PDF pages: 2

Technical content

www.vishay.com 161 1268 Vishay Foil Resistors Document Number: 63059 Revision 06-Aug-02 TRIMMERS

  • GERMANY +49.9287.710 FAX: +49 9287.70435
  • SINGAPORE +65.788.6668 FAX: +65.788.0988
  • UK +44 191 514 8237 FAX: +44 1953 457 722
  • USA +1 610 407-4800 FAX: +1 610 640-9081 NOTES: 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 σ (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 σ 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 @ + 85°C to zero (0) watts @ + 150°C. 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

FEATURES

  • Temperature Coefficient of Resistance (TCR): ± 20ppm/°C Max2. (– 55°C to + 150°C Ref. @ 25°C); Through the wiper3; ± 50ppm/°C
  • Load Life Stability: 0.1% Typical ∆R, 1.0% Maximum ∆R under Full Rated Power @ + 85°C for 1000 Hours
  • Settability: 0.1%
  • Setting Stability: 0.1% Typical1; 0.5% Maximum1, ∆SS
  • Power Rating4: 0.25 watts @ + 85°C
  • Resistance Range: 20Ω to 5KΩ
  • Resistance Tolerance: ± 10% *See Figure 1, next page. ADDITIONAL SPECIFICATIONS:
  • Contact Resistance Variation – CRV (noise): 10 ohms Maximum5
  • Hop-off: 0.25% Typical; 1.0% Maximum
  • Operating Temperature Range: – 55°C to + 150°C
  • Adjustment Turns: 21 ± 2
  • Mechanical Stops: Wiper Idles – No Discontinuity MODEL NO. TERMINATION RESISTANCE TOLERANCE STYLE VALUE 1268 W 100R 10% AVERAGE STANDARD RESISTANCE VALUES STANDARD POWER RATING @ NO. OF MODEL TERMINATION STYLE WEIGHT (g) (in Ω) TOLERANCES + 85°C AMBIENT TURNS 1268 W-Edge Mount, Top Adjust 20, 50, 100, 0.4 200, 500, 1K ± 10% 0.25W 21 ± 2 X-Edge Mount, Side Adjust 2K, 5K Bulk Metal® Foil Technology Precision Trimming Potentiometers 3/8 Inch Square, RJ24 Style - Industrial Trimmer TABLE 1 - MODEL SELECTION * Please specify Vishay Model 1268 Precision Trimming Potentiometers as follows: Example: TABLE 2 - ORDERING INFORMATION - 1268 SERIES PARTS See Table 1 for details. See Figure 1, next page for Standard Marking. Product may not be to scale

Document Number: 63059 Revision 06-Aug-02 www.vishay.com 162 1268 Vishay Foil Resistors TRIMMERS

  • GERMANY +49.9287.710 FAX: +49 9287.70435
  • SINGAPORE +65.788.6668 FAX: +65.788.0988
  • UK +44 191 514 8237 FAX: +44 1953 457 722
  • USA +1 610 407-4800 FAX: +1 610 640-9081 1268X STANDARD MARKING Model No. Date Code Resistance Value Tolerance 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. 1268W

3 PINS

0.420" (10.67mm) MAX 0.080" (2.03mm) MAX 0.300" (7.62mm) MIN 0.015" (0.38mm) MIN 0.187 ±0.020" (4.75 ±0.51mm) 0.100 ±0.005" (2.54 ±0.13mm) 0.090 ±0.005" (2.29 ±0.13mm) DIA 0.170 ±0.025" (4.32 ±0.64mm) 0.075 ±0.010" (1.91 ±0.25mm) 0.375 ±0.015" (9.53 ±0.38mm) 0.081 ±0.010" (2.08 ±0.25mm) 0.420" (10.67mm) MAX 0.080" (2.03mm) MAX 0.300" (7.62mm) MIN 0.015" (0.38mm) MIN 0.187 ±0.020" (4.75 ±0.51mm) 0.100 ±0.005" (2.54 ±0.13mm) 0.090 ±0.005" (2.29 ±0.13mm) DIA 0.170 ±0.025" (4.32 ±0.64mm) 0.075 ±0.010" (1.91 ±0.25mm) 0.375 ±0.015" (9.53 ±0.38mm) FIGURE 2 - POWER DERATING CURVE -75 -50 -25 +25 +50 +75 +100 +125 +150 +175 Ambient Temperature °C +85°C +100 +75 +50 +25 Percent of Rated Power FIGURE 1 - SCHEMATIC AND DIMENSIONS in inches (millimeters) Bulk Metal® Foil Technology Precision Trimming Potentiometers MAXIMUM MAXIMUM MINIMUM MINIMUM DIAMETER DIAMETER MAXIMUM MAXIMUM MINIMUM MINIMUM