Model 157
www.vishay.com Vishay Spectrol
Revision: 30-Sep-14 1Document Number: 57042
For technical questions, contact: sferprecisionpot@vishay.com
THIS DOCUMENT IS SUBJECT TO CHANGE WITHOUT NOTICE. THE PRODUCTS DESCRIBED HEREIN AND THIS DOCUMENT
ARE SUBJECT TO SPECIFIC DISCLAIMERS, SET FORTH AT www.vishay.com/doc?91000
7/8" (22.2 mm) Precision Industrial Potentiometer,
Bushing And Servo Mount Versions, Conductive Plastic
FEATURES
• High quality
• Rugged one piece metal housing
• Long rotational life
• Wide operating temperature range
• Linearities down to ± 0.25 % special
• Optional sealed construction (bushing mount only)
• Material categorization: for definitions of compliance
please see www.vishay.com/doc?99912
QUICK REFERENCE DATA
Sensor type ROTATIONAL, conductive plastic
Output type Output by turrets
Market appliance Industrial
Dimensions 7/8" (22.2 mm)
ELECTRICAL SPECIFICATIONS
PARAMETER MIL-PRF-39023 TEST PROCEDURES APPLY
Resistance 1 k to 100 k
Resistance Tolerance
Special to
± 20 %
± 10 %
Linearity
Special to
± 2.0 %
± 0.25 %
Temperature Coefficient of Resistance ± 600 ppm/°C
Power Rating
Derated to
1.0 W at 40 °C ambient
0 W at 125 °C
Electrical Angle 340° ± 4°
End Voltage 0.5 % maximum
Dielectric Withstanding 1000 VRMS, 60 Hz
Insulation Resistance 100 M minimum, 500 VDC
Output Smoothness 0.1 %
MECHANICAL SPECIFICATIONS
PARAMETER
Weight 0.5 oz. maximum (14 g)
Rotation 360° (continuous)
Mount
Bearing Type
BUSHING
Sleeve bearing
SERVO
Ball bearing
Operating Torque
Starting
Running
0.30 oz. - in (21.6 g - cm)
0.25 oz. - in (18 g - cm)
0.25 oz. - in (18 g - cm)
0.15 oz. - in (10.8 g - cm)
Mechanical Tolerance (in/mm) (maximum)
Shaft Runout (TIR) 0.002" (0.05 mm) 0.002" (0.05 mm)
Pilot Dia Runout (TIR) - 0.002" (0.05 mm)
Lateral Runout (TIR) 0.005" (0.13 mm) 0.002" (0.05 mm)
Shaft End Play 0.006" (0.15 mm) 0.005" (0.13 mm)
Shaft Radial Play 0.003" (0.08 mm) 0.002" (0.05 mm)
Model 157
www.vishay.com Vishay Spectrol
Revision: 30-Sep-14 2Document Number: 57042
For technical questions, contact: sferprecisionpot@vishay.com
THIS DOCUMENT IS SUBJECT TO CHANGE WITHOUT NOTICE. THE PRODUCTS DESCRIBED HEREIN AND THIS DOCUMENT
ARE SUBJECT TO SPECIFIC DISCLAIMERS, SET FORTH AT www.vishay.com/doc?91000
DIMENSIONS in inches (millimeters)
ORDERING INFORMATION
157B503MC
MODEL STYLE OHMIC VALUE TOLERANCE ON
OHMIC VALUE LINEARITY SPECIAL REQUEST
157 B: Bushing
S: servo
470 = 47
222 = 2.200
103 = 10 k
For ohmic value
range see electrical
specification
M = ± 20 %
J = ± 5 %
F = ± 1 %
X = ± 2 %
B = ± 0.50 %
C = ± 0.25 %
xxxx
PART NUMBER DESCRIPTION (for information only)
157- 2 1 503 xxxx
MODEL STYLE GANGS OHMIC VALUE SPECIAL
B: 1
S: 2
BUSHING MOUNT: 157B/157-1
0.455
(11.56)
± 0.015
0.062 (1.57)
0.062 (1.57)
Ø 0.1248
Ø 0.1245
(3.17)
0.062 (1.57)
0.500
(12.7)
Ø 0.750
(19.05)
Ø 0.070
(1.78)
Ø 0.050
(1.27)
RETAINER
Ø 0.20 MAX. x 0.02 MAX. (5.08)
Ø 0.7500 (19.05)
Ø 0.7495
SERVO MOUNT:
157S/157-2
0.875
(22.22)
± 0.031
Ø 0.2497
(6.34)
RETAINER: Ø 0.312 x 0.03 MAX.
3/8 - 32 UNEF - 2A
0.345
(8.76)
± 0.015
0.125
(3.18)
± 0.010
Ø 0.9.52 x 1.57 WIDE
IMPERFECT
THREAD AREA
0.365
(9.27)
± 0.010
0.312
(7.92)
LOCATING PIN Ø
0.062 x 0.062
(1.57 x 1.57)
TERM 1
TERM 2
TERM 3
90°
Ø 0.875
(22.2)
0.176 TERMINAL
RADIUS (4.47)
+ 0.0000
- 0.0003
TOLERANCES: UNLESS OTHERWISE NOTED.
DECIMALS ± 0.005 ANGLES ± 2°
CW
SCHEMATIC
2
3
1
± 0.031
Example of a marking for a standard part:
157-11103
Model 157
www.vishay.com Vishay Spectrol
Revision: 30-Sep-14 3Document Number: 57042
For technical questions, contact: sferprecisionpot@vishay.com
THIS DOCUMENT IS SUBJECT TO CHANGE WITHOUT NOTICE. THE PRODUCTS DESCRIBED HEREIN AND THIS DOCUMENT
ARE SUBJECT TO SPECIFIC DISCLAIMERS, SET FORTH AT www.vishay.com/doc?91000
MATERIAL SPECIFICATIONS
Housing/Bushing Aluminum, anodized
Rear Lid Ceramic
Shaft Stainless steel
Terminals Solderable
Bushing Mount Hardware Lockwasher, internal tooth steel, nickel plated
Panel Nut Brass, nickel plated
ENVIRONMENTAL SPECIFICATIONS
Temperature -55 °C to +125 °C
Rotational Life BUSHING
5 million shaft revolutions
SERVO
10 million shaft revolutions
Moisture Resistant Yes
Vibration 15 g 10 to 2000 Hz
Shock 50 g
Salt Spray 96 h
Load Life 900 h
Legal Disclaimer Notice
www.vishay.com Vishay
Revision: 02-Oct-12 1Document Number: 91000
Disclaimer
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“Vishay”), disclaim any and all liability for any errors, inaccuracies or incompleteness contained in any datasheet or in any other
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definitions and restrictions defined under Directive 2011/65/EU of The European Parliament and of the Council
of June 8, 2011 on the restriction of the use of certain hazardous substances in electrical and electronic equipment
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all the products identified as being compliant to Directive 2002/95/EC conform to Directive 2011/65/EU.
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requirements as per JEDEC JS709A standards. Please note that some Vishay documentation may still make reference
to the IEC 61249-2-21 definition. We confirm that all the products identified as being compliant to IEC 61249-2-21
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