1208
Vishay Foil Resistors
Bulk Metal
®
Foil Technology
Precision Trimming Potentiometers,
1 1/4 Inch Rectilinear, RJ12 Style - Industrial Trimmer
FEATURES
•
Temperature Coefficient of Resistance (TCR):
± 20 ppm/°C Maximum
3)
(- 55 °C to + 150 °C Ref. at + 25 °C);
Through the wiper
4)
: ± 50 ppm/°C typical
•
Load Life Stability: 0.5 % Maximum
ΔR
under Full Rated
Power for 2000 hours at + 85 °C
•
Settability: 0.1 %
•
Setting Stability: 0.1 % Typical
2)
; 0.5 % Maximum
2)
,
ΔSS
•
Power Rating
5)
: 0.5 watts at + 85 °C
•
Resistance Range: 20
Ω
to 10 kΩ
•
Tolerance: ± 20 %, ± 10 %
Product may not be to scale
TABLE 1 - MODEL SELECTION
†
MODEL
TERMINATION STYLE
P-In Line PC Pins
1208
RJ12
Style
Y-Staggered PC Pins
1)
L-Flexible Wire Leads
LB-Flexible Wire Leads with bushings
NOTES:
† See Figures 1 and 2 in this data sheet.
1. Preferred termination style for current 1-1/4 Inch rectilinear
trimmers (staggered PC pins present a sturdier mounting
arrangement for shock, vibration, and impact situations.)
2. Maximum is 1.0 % A.Q.L. standard for all specifications except
TCR. (For TCR information see notes 3 and 4). “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.
3. 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.)
4. 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.
5. Derated linearly from full power at + 85 °C to zero (0) watts at
+ 150 °C. See Figure 3 in this data sheet.
6. Independent of resistance value. 3 W maximum available on
special request.
Special Available Options:
Special Marking
Special lengths for lead wires (L, LB Style)
Hooked leads
Alternate bushing and PC combinations
Burn-in and screening operations
AVERAGE
STANDARD RESISTANCE
WEIGHT
VALUES (in
Ω)
(g)
2.5
2.5
3.3
5.1
20, 50, 100
200, 250, 500,
1K, 2K, 5K, 10K
STANDARD
TOLERANCE
± 20 %
0.5 W
± 10 %
25 ± 2
POWER RATING
at + 85 °C
AMBIENT
NO. OF
TURNS
ADDITIONAL SPECIFICATIONS:
•
Contact Resistance Variation - CRV (noise): 10
Ω
Maximum
6)
•
Hop-off: 0.25 % Typical; 1.0 % Maximum
•
Operating Temperature Range: - 55 °C to + 150 °C
•
Adjustment Turns: 25 ± 2
•
Mechanical Stops: Wiper Idles - No Discontinuity
TABLE 2 - ORDERING INFORMATION - 1208 SERIES PARTS
Please specify Vishay Model 1208 Precision Trimming
Potentiometers as follows:
MODEL
NO.
1208
TERMINATION
STYLE
P
RESISTANCE
VALUE
100R
TOLERANCE
10 %
NOTES:
See Table 1 for Details.
See Figure 1, next page for Standard Marking Illustration.
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For any questions, contact:
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Document Number: 63057
Revision: 24-Mar-10
1208
Vishay Foil Resistors
FIGURE 1 - SCHEMATIC AND DIMENSIONS
in inches (millimeters)
1208P
(In-Line
Pins)
1)
0.093" (2.36 mm)
DIAMETER (A)
DIA (A)
2 Mtg. Holes
1.000" (25.40 mm) C
0.125" (3.18 mm) A
0.070" (1.78 mm) C
Slot 0.025" (0.64 mm) W x
0.031" (0.79 mm) DP (A)
0.125"
(3.18 mm) A
0.235"
(5.97 mm) C
0.325"
(8.26 mm) A
0.195"
(4.95 mm) A
0.500"
(12.70 mm) C
0.028" (0.71 mm)
DIAMETER (B)
DIA (B)
3 Pin Type Leads
0.700"
(17.78 mm) C
0.900" (22.86 mm) C
2
1
0.260"
(6.60 mm) C
3
0.125"
(3.18 mm)
DIAMETER (A)
DIA (A)
2
1
CW
3
Schematic
1.250" (31.75 mm) C
1208Y
(Staggered Pins)
1)
0.125" (3.18 mm) A
0.093" (2.36 mm)
DIAMETER (A)
DIA (A)
2 Mtg. Holes
1.000" (25.40 mm) C
0.070" (1.78 mm) C
Slot 0.025" (0.64 mm) W x
0.031" (0.79 mm) DP (A)
0.125"
(3.18 mm) A
0.235"
(5.97 mm) C
0.325"
(8.26 mm) A
0.195"
(4.95 mm) A
0.500"
(12.70 mm) C
0.300" 0.265"
(7.62 mm) C (6.62 mm) C
0.700" (17.78 mm) C
2
0.028" (0.71 mm) DIA (B)
3 Pin Type Leads
0.100"
(2.54 mm) C
1
2
CW
1
3
0.125"
DIAMETER
(3.18 mm) DIA (A)
(A)
3
1.250" (31.75 mm) C
Schematic
TOLERANCES
A = ± 0.005 Inches (0.13 mm)
B = ± 0.003 Inches (0.08 mm)
C = ± 0.010 Inches (0.25 mm)
STANDARD MARKING ILLUSTRATION
Model No., Resistance Value,
Tolerance, TCR
Vishay Date Code
NOTE:
1. Pin leads are gold plated nickel which are solderable or weldable.
1
2
CW
3
Schematic
Document Number: 63057
Revision: 24-Mar-10
For any questions, contact:
foil@vishaypg.com
www.foilresistors.com
2
1208
Vishay Foil Resistors
FIGURE 2 - SCHEMATIC AND DIMENSIONS
in inches (millimeters)
1208L
(Flexible Leads)
0.093" (2.36 mm)
DIAMETER (A)
DIA (A)
2 Mtg. Holes
3 Color Coded Leads—
# 30 AWG Teflon Coated
Insulated Stranded Wire
1.000" (25.40 mm) C
11.50" (292.10 mm)
Minumum Length
G
Y
R
G
Y
R
1.250" (31.75 mm) C
0.125"
(3.18 mm)
DIAMETER (A)
R
DIA (A)
CW
Y
Schematic
G
0.125" (3.18 mm) A
0.070" (1.78 mm) C
Slot 0.025" (0.64 mm) W x
0.031" (0.79 mm) DP (A)
0.125"
(3.18 mm) A
0.235"
(5.97 mm) C
0.325"
(8.26 mm) A
0.195"
(4.95 mm) A
1208LB
(Panel Mounted)
0.093" (2.36 mm)
DIAMETER (A)
DIA (A)
2 Mtg. Holes
3 Color Coded Leads—
# 30 AWG Teflon Coated
Insulated Stranded Wire
1.000" (25.40 mm) C
11.50" (292.10 mm)
Minumum Length
G
Y
R
0.125" (3.18 mm) C
0.195"
(4.95 mm) A
CW
Y
Schematic
G
0.325"
(8.26 mm) A
0.125" (3.18 mm) A
0.042" (1.07 mm) B
0.280" (7.11 mm) B
# 10 - 32 N.C. - 2
0.400"
0.235"
(10.16 mm) A
(5.97 mm) A
0.300"
(7.62 mm) A
Slot:
0.025" (0.64 mm) W x
0.031" (0.79 mm) DP (A)
1.250" (31.75 mm) C
G
Y
R
Rubber Gasket
Lockwasher
Hexnut
R
TOLERANCES
A = ± 0.005 Inches (0.13 mm)
B = ± 0.003 Inches (0.08 mm)
C = ± 0.010 Inches (0.25 mm)
Standard marking shown on previous page.
FIGURE 3 - POWER DERATING CURVE
Percent of Rated Power
+ 100
+ 75
+ 50
+ 25
0
- 50
- 25
0
+ 25
+ 50
+ 75 + 100 + 125 + 150 + 175
+ 85 °C
Ambient Temperature °C
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For any questions, contact:
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Document Number: 63057
Revision: 24-Mar-10
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Vishay Precision Group, Inc.
Disclaimer
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(collectively, “VPG”), disclaim any and all liability for any errors, inaccuracies or incompleteness contained herein or in
any other disclosure relating to any product.
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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
incidental damages, and (iii) any and all implied warranties, including warranties of fitness for particular purpose,
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Copyright Vishay Precision Group, Inc., 2014. All rights reserved.
Document No.: 63999
Revision: 15-Jul-2014
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