1268
Vishay Foil Resistors
Bulk Metal
®
Foil Technology
Precision Trimming Potentiometers,
3/8 Inch Square, RJ24 Style - Industrial Trimmer
FEATURES
•
Temperature Coefficient of Resistance (TCR):
± 20 ppm/°C Max
2)
. (- 55 °C to + 150 °C Ref. at 25 °C);
Through the wiper
3)
; ± 50 ppm/°C
•
Load Life Stability: 0.1 % Typical
ΔR,
1.0 % Maximum
ΔR
under Full Rated Power at + 85 °C for 1000 Hours
•
Settability: 0.1 %
•
Setting Stability: 0.1 % Typical
1)
; 0.5 % Maximum
1)
,
ΔSS
•
Power Rating
4)
: 0.25 watts at + 85 °C
Product may not be to scale
•
Resistance Range: 20
Ω
to 5 kΩ
•
Resistance Tolerance: ± 10 %
TABLE 1 - MODEL SELECTION
†
MODEL
1268
TERMINATION STYLE
W-Edge Mount, Top Adjust
X-Edge Mount, Side Adjust
AVERAGE
WEIGHT (g)
0.4
STANDARD RESISTANCE
VALUES (in
Ω)
20, 50, 100, 200, 500,
1K, 2K, 5K
STANDARD
TOLERANCES
± 10 %
POWER RATING
at + 85 °C AMBIENT
0.25 W
NO. OF
TURNS
21 ± 2
NOTES:
† See Figure 1, next page.
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 s (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 s 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 at + 85 °C to zero (0) watts at
+ 150 °C. See Figure 2, next page.
5. Independent of resistance value 3 W maximum available on
special request.
Special Available Options:
Special marking
Burn-in and screening operations
ADDITIONAL SPECIFICATIONS:
•
Contact Resistance Variation - CRV (noise): 10
Ω
Maximum
5)
•
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
TABLE 2 - ORDERING INFORMATION - 1268 SERIES PARTS
Please specify Vishay Model 1268 Precision Trimming
Potentiometers as follows:
MODEL
NO.
1268
NOTES:
See Table 1 for details.
See Figure 1, next page for Standard Marking.
TERMINATION
STYLE
W
RESISTANCE
VALUE
100R
TOLERANCE
10 %
www.foilresistors.com
1
For any questions, contact:
foil@vishaypg.com
Document Number: 63059
Revision: 24-Mar-10
1268
Vishay Foil Resistors
FIGURE 1 - SCHEMATIC AND DIMENSIONS
in inches (millimeters)
1268W
0.081 ± 0.010" (2.08 ± 0.25 mm)
0.080" (2.03 mm)
MAXIMUM
MAX
VISHAY
0.420" (10.67 mm)
MAXIMUM
MAX
0.015" (0.38 mm) MIN
MINIMUM
CW
0.300" (7.62 mm)
MINIMUM
MIN
3
1
2
3 PINS
0.024 ± 0.006" (0.61 ± 0.15 mm)
DIAMETER
DIA
0.090 ± 0.005"
(2.29 ± 0.13 mm) DIA
± 0.010" (± 0.25 mm)
C
0.100 ± 0.005"
(2.54 ± 0.13 mm)
0.187 ± 0.020"
(4.75 ± 0.51 mm)
0.170 ± 0.025"
(4.32 ± 0.64 mm)
0.075 ± 0.010"
(1.91 ± 0.25 mm)
0.375 ± 0.015"
(9.53 ± 0.38 mm)
STANDARD MARKING
Model No.
Date Code
Resistance Value
Tolerance
NOTES
Adjustment screw 0.090 Inches
(2.30 mm) diameter with 0.020
1268X
0.080" (2.03 mm) MAX
MAXIMUM
0.081 ± 0.010"
(2.08 ± 0.25 mm)
0.420" (10.67 mm) MAX
Inches (0.51 mm) x 0.031 Inches
(0.80 mm) slot. Model 1268 has
VISHAY
2
CW
solder plated copper terminal
pins. 0.024 Inches (0.61 mm)
diameter, 0.300 Inches (7.62 mm)
length minimum.
3
MAXIMUM
0.015" (0.38 mm) MIN
MINIMUM
0.300" (7.62 mm) MIN
MINIMUM
1
3 PINS
0.024 ± 0.006" (0.61 ± 0.15 mm) DIA
DIAMETER
± 0.010" (± 0.25 mm)
C
0.100 ± 0.005"
(2.54 ± 0.13 mm)
0.187 ± 0.020"
(4.75 ± 0.51 mm)
0.170 ± 0.025"
(4.32 ± 0.64 mm)
0.075 ± 0.010"
(1.91 ± 0.25 mm)
0.090 ± 0.005"
(2.29 ± 0.13 mm) DIA
0.375 ± 0.015"
(9.53 ± 0.38 mm)
FIGURE 2 - POWER DERATING CURVE
Percent of Rated Power
+ 100
+ 75
+ 50
+ 25
0
- 75
- 50
- 25
0
+ 25
+ 50 + 75 + 100 + 125 + 150 + 175
+ 85 °C
Ambient Temperature °C
Document Number: 63059
Revision: 24-Mar-10
For any questions, contact:
foil@vishaypg.com
www.foilresistors.com
2
Legal Disclaimer Notice
Vishay Precision Group, Inc.
Disclaimer
ALL PRODUCTS, PRODUCT SPECIFICATIONS AND DATA ARE SUBJECT TO CHANGE WITHOUT NOTICE.
Vishay Precision Group, Inc., its affiliates, agents, and employees, and all persons acting on its or their behalf
(collectively, “VPG”), disclaim any and all liability for any errors, inaccuracies or incompleteness contained herein or in
any other disclosure relating to any product.
The product specifications do not expand or otherwise modify VPG’s terms and conditions of purchase, including but
not limited to, the warranty expressed therein.
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application or use of any product, (ii) any and all liability, including without limitation special, consequential or
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Information provided in datasheets and/or specifications may vary from actual results in different applications and
performance may vary over time. Statements regarding the suitability of products for certain types of applications
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responsibility to validate that a particular product with the properties described in the product specification is suitable for
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Please contact authorized VPG personnel to obtain written terms and conditions regarding products designed for such
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Product names and markings noted herein may be trademarks of their respective owners.
Copyright Vishay Precision Group, Inc., 2014. All rights reserved.
Document No.: 63999
Revision: 15-Jul-2014
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