Model 128
Vishay Spectrol
1
1
/
16
" (27 mm) Single Turn Conductive Plastic
Precision Potentiometer
FEATURES
•
1
1
/
16
" round
•
Bushing mount and servo mount types
•
Designed for high reliability applications
•
Ohmic value range: 500
Ω
to 50 kΩ
•
Rotational life exceeds 20 million shaft revolutions
•
Virtually infinite resolution
•
Up to 6 sections available
•
Co-molded track and multi-finger wiper provide low noise
signal
RoHS
COMPLIANT
ELECTRICAL SPECIFICATIONS
PARAMETER
STANDARD
Total Resistance:
Tolerance
Linearity (Independent)
Electrical Angle
Power Rating
Section 1:
Additional Section:
Output Smoothness
Insulation Resistance
Dielectric Strength
Phasing (CCW End Points)
Temperature Coefficient of Resistance
Taps (Extra)
1.25 W at 70 °C ambient, derated to zero at 125 °C ambient
75 % of the rating of section 1
0.1 % maximum
1000 MΩ min, 500 V
DC
1000 V
RMS
, 60 Hz
Points at which output ratio is 0.5 aligned ± 1° (ref. section 1)
± 400 ppm/°C maximum
Extra taps available as special
500
Ω
to 50 kΩ
± 10 %
± 0.5 %
345° ± 4°
±5%
± 0.15 %
SPECIAL
ORDERING INFORMATION/DESCRIPTION
The Model 128 can be ordered from this data sheet with a variety of alternate characteristics, as shown above. For most rapid service on
your order, please state:
128
MODEL
S
MOUNTING
B:
Bushing
S:
Servo
1
NUMBER OF SECTIONS
Up to 6
1K
TOTAL RESISTANCE OF EACH SECTION
Beginning with the section nearest the
mounting end
BO1
PACKAGING
Box of 1 piece
Other characteristics will be standard as described on this data sheet. If special characteristics are required, such as: special linearity
tolerance, special resistance tolerance, extra taps, non-linear functions, etc., please state these on your order and allow additional lead time
for delivery.
SAP PART NUMBERING GUIDELINES
128
MODEL
S
STYLE
B:
Bushing
S:
Servo
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32
3
GANGS
From 1 up to 6
103
OHMIC VALUE
GANG N
O
1
10K
102
OHMIC VALUE
GANG N
O
2
1K
203
OHMIC VALUE
GANG N
O
3
20K
B01
PACKAGING
Box of 1 piece
For technical questions, contact: sfer@vishay.com
Document Number: 57037
Revision: 04-Jul-07
Model 128
1
1
/
16
" (27 mm) Single Turn Conductive Plastic
Precision Potentiometer
DIMENSIONS
in inches (millimeters)
± 0.010
Vishay Spectrol
1
0.687
(17.45)
BUSHING MOUNT: 128 B
0.875
(22.22)
± 0.031
0.375
(9.52)
± 0.015
0.308 MIN.
(7.82)
0.062
(1.57)
Ø 0.1248
(3.17)
+ 0.0000
- 0.0003
3
30°
TYP.
1
2
Ø 0.4062
- 0.0010
(10.32)
+ 0.0000
Ø 1.062
(26.97)
± 0.015
3
/
MTG. FACE
0.308 MIN.
(7.82)
0.500
(12.70)
0.062
(1.57)
0.062
(1.57)
0.062
(1.57)
8
32 UNEF - 2A
R 0.735 MAX.
(18.67)
SERVO MOUNT: 128 S
± 0.031
+ 0.0000
Ø 0.9688
- 0.0005
(24.61)
1
ADD 0.782 ± 0.002 (19.86) FOR EACH
ADDITIONAL SECTION
2
CW
3
Ø 1.062
(26.97)
± 0.015
Ø 1.062
(26.97)
1
SCHEMATIC
TOLERANCES: UNLESS OTHERWISE NOTED.
DECIMALS ± 0.005 ANGLES ± 2°
Ø 0.968 MAX.
(24.58)
MTG. FACE
Ø
(3.17)
+ 0.0000
0.1248
- 0.0003
MECHANICAL SPECIFICATIONS
PARAMETER
Rotation
Bearing Type
Torque (Maximum)
Servo, 1 Section
Bushing, 1 Section
Each Additional Section
Mechanical Runouts (Maximum)
Shaft Runout (TIR/in)
Pilot Dia. Runout (TIR/in)
Lateral Runout (TIR)
Shaft End Play
Shaft Radial Play
Weight (Maximum):
Single Section
Each Additional Section
Ganging
Moment of Inertia
Document Number: 57037
Revision: 04-Jul-07
SERVO MOUNT
Ball bearing
STARTING
0.25 oz. - in (18.0 g - cm)
0.30 oz. - in (21.6 g - cm)
0.20 oz. - in (14.4 g - cm)
SERVO
0.002" (0.05 mm)
0.002" (0.05 mm)
0.002" (0.05 mm)
0.005" (0.13 mm)
0.002" (0.05 mm)
0.8 oz. (22.7 g)
0.4 oz. (11.3 g)
6 sections maximum, terminal alignment, added sections, within ± 10° of section 1 terminals
0.12 g - cm
2
per section maximum
For technical questions, contact: sfer@vishay.com
www.vishay.com
33
360° continuous
BUSHING MOUNT
Sleeve bearing
RUNNING
0.15 o.z - in (10.8 g - cm)
0.25 oz. - in (18.0 g - cm)
0.15 oz. - in (10.8 g - cm)
BUSHING
0.002" (0.05 mm)
0.002" (0.05 mm)
0.005" (0.13 mm)
0.005" (0.13 mm)
0.003" (0.08 mm)
Model 128
Vishay Spectrol
1
1
/
16
" (27 mm) Single Turn Conductive Plastic
Precision Potentiometer
ENVIRONMENTAL SPECIFICATIONS
Vibration
Shock
Salt Spray
Rotational Life
Bushing Mount Hardware
Lockwasher Internal Tooth,
Panel Nut:
Steel, nickel plated
Brass, nickel plated
Load Life
Temperature Range
15 g thru 2000 Hz
50 g
96 h
Servo: 20 million shaft revolutions
Bushing: 5 million shaft revolutions
900 h
- 55 °C to + 125 °C
MATERIAL SPECIFICATIONS
Housing and Lids
Shaft
Terminals
Aluminum, anodized
Stainless steel, non-magnetic
non-passivated
Brass plated for solderability
MECHANICAL SPECIFICATIONS
Unit
Identification
Units shall be marked with Vishay Spectrol name, model number and data code on each
section, resistance, resistance tolerance, linearity and terminal identification
POWER RATING CHART
(Ratings for cup No. 1.
Additional cups 75 % of values shown)
RESISTANCE ELEMENT DATA
RESISTANCE
VALUES
(Ω)
500
MAXIMUM VOLTAGE
APPLICABLE
(V)
25
35
50
79
112
158
250
RATED POWER IN W
2.0
1.5
1.0
0.5
0
1K
2K
5K
10K
20
40
60
80
100
120 140
160
20K
50K
AMBIENT TEMPERATURE IN °C
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34
For technical questions, contact: sfer@vishay.com
Document Number: 57037
Revision: 04-Jul-07
Legal Disclaimer Notice
Vishay
Disclaimer
All product specifications and data are subject to change without notice.
Vishay Intertechnology, Inc., its affiliates, agents, and employees, and all persons acting on its or their behalf
(collectively, “Vishay”), disclaim any and all liability for any errors, inaccuracies or incompleteness contained herein
or in any other disclosure relating to any product.
Vishay disclaims any and all liability arising out of the use or application of any product described herein or of any
information provided herein to the maximum extent permitted by law. The product specifications do not expand or
otherwise modify Vishay’s terms and conditions of purchase, including but not limited to the warranty expressed
therein, which apply to these products.
No license, express or implied, by estoppel or otherwise, to any intellectual property rights is granted by this
document or by any conduct of Vishay.
The products shown herein are not designed for use in medical, life-saving, or life-sustaining applications unless
otherwise expressly indicated. Customers using or selling Vishay products not expressly indicated for use in such
applications do so entirely at their own risk and agree to fully indemnify Vishay for any damages arising or resulting
from such use or sale. Please contact authorized Vishay personnel to obtain written terms and conditions regarding
products designed for such applications.
Product names and markings noted herein may be trademarks of their respective owners.
Document Number: 91000
Revision: 18-Jul-08
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1
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