148, 149
Vishay Spectrol
1/2" (12.7 mm) Conductive Plastic and Cermet
Potentiometer
FEATURES
Robust construction
High rotational life (50 000 cycles)
Up to three sections PC support plates
Rotary switches and solder lugs terminals available
Tests according to CECC 41000 or IEC 60393-1
Compliant to RoHS Directive 2002/95/EC
148 FEATURES
Conductive plastic element
Quiet electrical output
149 FEATURES
Cermet element
Low temperature coefficient (± 150 ppm/°C)
DIMENSIONS
in millimeters (inches) ± 0.5 mm (± 0.02"
)
Single, dual or triple
12.5
(0.492)
0.8
(0.031)
12.5
(0.492)
Solder lug terminals
16.45
(0.648)
12.5
(0.492)
6.35
(0.250)
1.2
(0.047)
8.0
(0.315)
4.900
(0.193)
4.7
(0.185)
8.83
(0.348)
9.52
(0.375)
8.85
(0.341)
12.5
(0.492)
0.6
(0.024)
0.6
(0.024)
0.6
(0.024)
2.54
(0.100)
1 2 3
2.54
(0.100)
0.30
(0.012)
5.07
(0.200)
3.17
(0.125)
2.4
(0.094)
Thread 1/4 32-NEF-2A
7.62
(0.300)
0.9
(0.035)
1.800
(0.071)
4.65
(0.183)
1
2
3
0.300
(0.012)
4.770
(0.188)
Thread 3/8 32-NEF-2A
4.65
(0.183)
Front and rear support plates
E = Flush with board surface
4.70
(0.185)
12.5
(0.492)
0.80
(0.031)
Dual
Single
0.60
(0.024)
12.50
(0.492)
2.54
(0.100)
5.08
(0.200)
1 2 3
2.54
(0.100)
5.08
(0.200)
6.35
(0.250)
7.62
(0.300)
1.52
(0.06)
3.85
(0.151)
6.35
(0.250)
1.52
(0.06)
3.85
(0.151)
www.vishay.com
102
Document Number: 57040
For technical questions, contact:
sfer@vishay.com
See also Application Notes:
www.vishay.com/doc?51001
and
www.vishay.com/doc?52029
Revision: 05-May-11
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
6.35
(0.250)
148, 149
1/2" (12.7 mm) Conductive Plastic and Cermet
Potentiometer
ELECTRICAL SPECIFICATIONS
PARAMETER
Linear
Resistance Range
Non-Linear
Linear
Tolerance
Non-Linear
Linearity (Typical)
End Resistance
0.5 W at 70 °C
0 W at 120 °C
20 % on request 10 %
± 5 % independent
4 maximum each end
1 W at 70 °C
0 W at 150 °C
10 %
500 to 500 k
10 %
250 to 1 M
10 %
148
1 k to 1 M
149
100
to 2 M
Vishay Spectrol
Power Rating
Non-Linear or PC mount, derate 50 %
a
c
(3)
b
(2)
cw
Circuit Diagram
(1)
Effective Rotation
Contact Resistance Variation
Maximum Continuous Working Voltage
Dielectric Withstanding Voltage
270° ± 10 ° without rotary switch
240° ± 10 ° with rotary switch
1.5 % of total resistance
3 % of total resistance
350 V
AC
across end terminals, but within power rating
Sea level - 750 V
AC
MECHANICAL SPECIFICATIONS
Mechanical Travel
Operating Torque (Typical)
Bushing A and B
End Stop Torque
Bushing F
Single
Weight (approx.)
Dual
Triple
Electrical Elements
Terminals
Switch Elements
e4: Gold plated
300° ± 5°
Single section 0.2 oz. to 3.0 oz. - in dual or triple section 0.3 oz.-inch to 4.5 oz.-inch
2.1 lb-inch max.
6.8 lb-inch max.
0.19 oz.
0.27 oz.
0.35 oz.
e3: Pure Sn
ENVIRONMENTAL SPECIFICATIONS
148
Operating Temperature
Storage Temperature
Temperature Cycling (5 Cycles)
Load Life (1000 h Rated Load at 70 °C)
Mechanical Endurance
TCR (Typical)
Sealing
± 500 ppm/°C
IP64
- 40 °C to + 125 °C
- 55 °C to + 125 °C
- 40 °C to + 125 °C (4 %
R
T
)
10 %
R
T
50 000 cycles
± 150 ppm/°C
149
- 40 °C to + 125 °C
- 55 °C to + 125 °C
- 40 °C to + 125 °C (3 %
R
T
)
5 %
R
T
Document Number: 57040
Revision: 05-May-11
www.vishay.com
For technical questions, contact:
sfer@vishay.com
See also Application Notes:
www.vishay.com/doc?51001
and
www.vishay.com/doc?52029
103
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
148, 149
Vishay Spectrol
1/2" (12.7 mm) Conductive Plastic and Cermet
Potentiometer
LOCATING PEGS
(Anti-Rotation Lug)
The locating peg is provided by a plate mounted on the bushing
and positioned by the module sides. Four set positions are
available, clock face orientation: 12, 3, 6, 9.
All 148, 149 bushings have a double flat. When panel mounting
holes have been punched accordingly, an anti-rotation lug is not
necessary.
L
12
9
3
CODE
A
B
C
VERSION
Ø d mm
L mm
Ø d mm
L mm
Ø d mm
L mm
BUSHING
A, B
2
6.2
2
7.75
-
-
BUSHING EFFECTIVE
F
HIGH PEG
2
6.2
2
7.75
3.5
13.5
0.7
-
0.7
-
1.1
-
Locating pegs are supplied in separate bags with nuts and
washers
Ød
6
RSID OPTION: ROTARY SWITCH MODULES
• Rotary switches
• Current up to 2 A
• SPDT: Single pole, changeover switch in CCW position - 3 pins
• Sealing IP60
MODULES: RS ON/OFF SWITCH
RSI CHANGEOVER SWITCH
The position of each module is free.
RS and RSI rotary switches are housed in a standard 148, 149
module size 12.7 mm x 12.7 mm x 5.08 mm (0.5" x 0.5" x 0.2").
They have the same terminal styles as the assembled electrical
modules.
An assembly can comprise 1 or more switch modules.
Switch actuation is described as seen from the shaft end.
D:means actuation in maximum CCW position
The switch actuation travel is 25° with a total mechanical travel of
300° ± 5° and electrical travel of electrical modules is 238° ± 10°.
RSID SINGLE POLE CHANGEOVER
In full CCW position, the contact is made between 3 and 2 and
open between 3 and 1. Switch actuation (CW direction) reverses
these positions.
SWITCH SPECIFICATIONS
Switching Power Maximum
Switching Current Maximum
Maximum Current Through Element
Contact Resistance
Dielectric
Strength
Terminal to Terminal
Terminal to Bushing
62.5 VA
15 VA =
0.25 A 250 V
0.5 A 30 V =
2A
100 m
1000 V
RMS
2000 V
RMS
250 V
30 V =
10
6
M
10 000 actuations
25°
- 40 °C to +
85
°C
Maximum Voltage Operation
Insulation Resistance Between Contacts
Life at P
max.
Minimal Travel
Operating Temperature
ELECTRICAL DIAGRAM
RSID
CCW POSITION
1
2 3
(1)
Note
(1)
Common
www.vishay.com
104
Document Number: 57040
For technical questions, contact:
sfer@vishay.com
See also Application Notes:
www.vishay.com/doc?51001
and
www.vishay.com/doc?52029
Revision: 05-May-11
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
148, 149
1/2" (12.7 mm) Conductive Plastic and Cermet
Potentiometer
ORDERING INFORMATION
(Part Number)
1
4
8
1
0
F
0
G
J
S
X
1
0
1
0
3
K
A
Vishay Spectrol
MODEL
148 = Plastic
conductive
149 = Cermet
element
NUMBER OF
MODULES
1
2
3
SWITCH
1 = RSID
0 = Without
switch
BUSHING
See table
“Bushing”
LOCATING
PEG
0 = Without
A
B
C
SHAFT
See table
“Shaft”
SHAFT END
S = Slotted
On request:
R = Round
F = Flatted
LEADS
See table
“Leads”
RESISTANCE
CODE/TOLERANCE/
TAPER OR SPECIAL
Resistance code:
101 = 100
to
105 = 1 M
Tolerance code:
M = 20 %; K = 10 %
Taper: A (S); L (Z); F (R)
or
special code
given by Vishay
BUSHING
Ø
A
B
F
1/4"
1/4"
3/8"
L
1/4"
3/8"
3/8"
OLD CODES
N
J
G
SHAFT
Ø
BB
BG
BH
BJ
1/8"
1/8"
1/8"
1/8"
1/4"
1/4"
1/4"
1/4"
1/4"
1/4"
L
1/2"
5/8"
3/4"
7/8"
1/2"
5/8"
3/4"
7/8"
1"
1 1/4"
OLD CODES
32
40
48
56
32
40
48
56
64
80
LEADS
TYPE
PIN
SPACING
SPACE
BETWEEN
MODULES
n/a
7.62 mm
(0.300")
n/a
7.62 mm
(0.300")
n/a
7.62 mm
(0.300")
S
E
P
OLD
CODES
GB
GG
GH
GJ
X10
PCB pins
X13
A10
A13
Y00
Sold, lugs
Y03
2.54 mm
(0.100")
GL
GN
PCB pins and
support plates
2.54 mm
(0.100")
4.65 mm
(0.183")
PART NUMBER DESCRIPTION
(for information only)
148
1
0
F
0
GJ
S
X10
BO50
10K
10 %
A
e3
MODEL MODULES SWITCH BUSHING
LOCATING
LEAD
SHAFT SHAFT LEADS PACK. VALUE TOL. TAPER SPECIAL SPECIAL
PEG
FINISH
Document Number: 57040
Revision: 05-May-11
www.vishay.com
For technical questions, contact:
sfer@vishay.com
See also Application Notes:
www.vishay.com/doc?51001
and
www.vishay.com/doc?52029
105
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
Legal Disclaimer Notice
www.vishay.com
Vishay
Disclaimer
ALL PRODUCT, PRODUCT SPECIFICATIONS AND DATA ARE SUBJECT TO CHANGE WITHOUT NOTICE TO IMPROVE
RELIABILITY, FUNCTION OR DESIGN OR OTHERWISE.
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 in any datasheet or in any other
disclosure relating to any product.
Vishay makes no warranty, representation or guarantee regarding the suitability of the products for any particular purpose or
the continuing production of any product. To the maximum extent permitted by applicable law, Vishay disclaims (i) any and all
liability arising out of the 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, non-infringement and merchantability.
Statements regarding the suitability of products for certain types of applications are based on Vishay’s knowledge of typical
requirements that are often placed on Vishay products in generic applications. Such statements are not binding statements
about the suitability of products for a particular application. It is the customer’s responsibility to validate that a particular
product with the properties described in the product specification is suitable for use in a particular application. Parameters
provided in datasheets and/or specifications may vary in different applications and performance may vary over time. All
operating parameters, including typical parameters, must be validated for each customer application by the customer’s
technical experts. Product specifications do not expand or otherwise modify Vishay’s terms and conditions of purchase,
including but not limited to the warranty expressed therein.
Except as expressly indicated in writing, Vishay products are not designed for use in medical, life-saving, or life-sustaining
applications or for any other application in which the failure of the Vishay product could result in personal injury or death.
Customers using or selling Vishay products not expressly indicated for use in such applications do so at their own risk and agree
to fully indemnify and hold Vishay and its distributors harmless from and against any and all claims, liabilities, expenses and
damages arising or resulting in connection with such use or sale, including attorneys fees, even if such claim alleges that Vishay
or its distributor was negligent regarding the design or manufacture of the part. Please contact authorized Vishay personnel to
obtain written terms and conditions regarding products designed for such applications.
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. Product names and markings noted herein may be trademarks of their respective owners.
Material Category Policy
Vishay Intertechnology, Inc. hereby certifies that all its products that are identified as RoHS-Compliant fulfill the
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
(EEE) - recast, unless otherwise specified as non-compliant.
Please note that some Vishay documentation may still make reference to RoHS Directive 2002/95/EC. We confirm that
all the products identified as being compliant to Directive 2002/95/EC conform to Directive 2011/65/EU.
Revision: 12-Mar-12
1
Document Number: 91000
Switching Power Supply Study Group
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