148, 149
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Revision: 12-Apr-18 1Document Number: 57040
For technical questions, contact: sferpottrimmers@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
1/2" (12.7 mm) Conductive Plastic and Cermet Potentiometer
DESIGN SUPPORT TOOLS
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
• Material categorization: for definitions of compliance
please see www.vishay.com/doc?99912
148 FEATURES
• Conductive plastic element
• Quiet electrical output
149 FEATURES
• Cermet element
• Low temperature coefficient (± 150 ppm/°C)
QUICK REFERENCE DATA
Multiple module Up to 3 modules
Switch module Yes
Detent module n/a
Special electrical laws A: linear, L: logarithmic, F: reverse
logarithmic
Sealing level IP 64
Lifespan 50K cycles
click logo to get started
Available
Models
DIMENSIONS in millimeters (inches) ± 0.5 mm (± 0.02")
12.5
(0.492)
12.5
(0.492)
(0.648)
16.45
2.54
2.54
(0.100)
(0.100)
123
123
123
7.62
(0.300)
Thread 1/4 32-NEF-2A
0.30
(0.012)
5.07
(0.200)
Single, dual or triple
Front and rear support plates
E = Flush with board surface
Dual Single
5.08
(0.200)
5.08
(0.200)
12.50
(0.492)
Solder lug terminals
0.8
(0.031)
0.80
(0.031)
4.7
(0.185)
4.70
(0.185)
8.83
(0.348)
6.35
(0.250)
6.35
(0.250) 6.35
(0.250)
3.85
(0.151)
1.52
(0.06)
0.6
(0.024)
0.6
(0.024)
0.60
(0.024)
8.85
(0.341)
3.17
(0.125)
12.5
(0.492)
0.6
(0.024)
12.5
(0.492)
2.54
(0.100) 2.54
(0.100) 7.62
(0.300) 3.85
(0.151)
1.52
(0.06)
1.2
(0.047)
12.5
(0.492)
4.65
(0.183) 4.65
(0.183)
1.800
(0.071)
2.4
(0.094)
4.900
(0.193)
6.35
(0.250)
8.0
(0.315)
0.9
(0.035)
0.300
(0.012)
4.770
(0.188)
9.52
(0.375)
Thread 3/8 32-NEF-2A
FMS
FMS
148, 149
www.vishay.com Vishay Spectrol
Revision: 12-Apr-18 2Document Number: 57040
For technical questions, contact: sferpottrimmers@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
Note
• Nothing stated herein shall be construed as a guarantee of quality or durability
ELECTRICAL SPECIFICATIONS
PARAMETER 148 149
Resistance range linear 1 k to 1 M100 to 2 M
non-linear 500 to 500 k250 to 1 M
Tolerance linear 10 % 10 %
non-linear 20 % on request 10 % 10 %
Linearity (typical) ± 5 % independent
End resistance 4 maximum each end
Power rating
0.5 W at 70 °C
0 W at 120 °C
1 W at 70 °C
0 W at 150 °C
Non-linear or PC mount, derate 50 %
Circuit diagram
Effective rotation 270° ± 10 ° without rotary switch
240° ± 10 ° with rotary switch
Contact resistance variation (typical) 1.5 % of total resistance 3 % of total resistance
Maximum continuous working voltage 350 VAC across end terminals, but within power rating
Dielectric withstanding voltage Sea level -750 VAC
MECHANICAL SPECIFICATIONS
Mechanical travel 300° ± 5°
Operating torque (typical) Single section 0.2 oz. to 3.0 oz. - in dual or triple section 0.3 oz.-inch to 4.5 oz.-inch
End stop torque bushing A and B 2.1 lb-inch max.
bushing F 6.8 lb-inch max.
Weight (approx.)
single 0.19 oz.
dual 0.27 oz.
triple 0.35 oz.
Terminals electrical elements e3: pure Sn
switch elements e4: gold plated
ENVIRONMENTAL SPECIFICATIONS
148 149
Operating temperature -40 °C to +125 °C -40 °C to +125 °C
Storage temperature -55 °C to +125 °C -55 °C to +125 °C
Temperature cycling (5 cycles) -40 °C to +125 °C (4 % RT) -40 °C to +125 °C (3 % RT)
Load life (1000 h rated load at 70 °C) 10 % RT5 % RT
Mechanical endurance 50 000 cycles
TCR (typical) ± 500 ppm/°C ± 150 ppm/°C
Sealing IP64
MARKING
Vishay logo, SAP code of ohmic value, tolerance in %, variation law, manufacturing date (four digits), “3” for the lead 3, product series
(148, 149)
a
(1)
b
(2)
c
(3)
cw
148, 149
www.vishay.com Vishay Spectrol
Revision: 12-Apr-18 3Document Number: 57040
For technical questions, contact: sferpottrimmers@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
Note
(1) Common
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. CODE VERSION BUSHING
A, B
BUSHING
F
EFFECTIVE
HIGH PEG
All 148, 149 bushings have a double flat. When panel mounting
holes have been punched accordingly, an anti-rotation lug is not
necessary.
AØ d mm 2 2 0.7
L mm 6.2 6.2 -
BØ d mm 2 2 0.7
L mm 7.75 7.75 -
CØ d mm - 3.5 1.1
L mm - 13.5 -
Locating pegs are supplied in separate bags with nuts and
washers
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 62.5 VA
15 VA =
Switching Current Maximum 0.25 A 250 V
0.5 A 30 V =
Maximum Current Through Element 2 A
Contact Resistance 100 m
Dielectric
Strength
Terminal to Terminal 1000 VRMS
Terminal to Bushing 2000 VRMS
Maximum Voltage Operation 250 V
30 V =
Insulation Resistance Between Contacts 106 M
Life at Pmax. 10 000 actuations
Minimal Travel 25°
Operating Temperature -40 °C to +85 °C
ELECTRICAL DIAGRAM
12
L
3
6
9
Ø d
Spacer module
5.08 2.54
L
l
RSID
CCW POSITION
13 (1)
2
148, 149
www.vishay.com Vishay Spectrol
Revision: 12-Apr-18 4Document Number: 57040
For technical questions, contact: sferpottrimmers@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
ORDERING INFORMATION (part number)
MODEL NUMBER OF
MODULES SWITCH BUSHING LOCATING
PEG SHAFT SHAFT END LEADS
RESISTANCE
CODE/TOLERANCE/
TAPER OR SPECIAL
148 = plastic
conductive
149 = cermet
element
1
2
3
1 = RSID
0 = without
switch
See table
“Bushing”
0 = without
A
B
C
See table
“Shaft”
S = slotted
On request:
R = round
F = flatted
See table
“Leads”
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 L OLD CODES
A 1/4" 1/4" N
B 1/4" 3/8" J
F 3/8" 3/8" G
LEADS
TYPE PIN
SPACING
SPACE
BETWEEN
MODULES
OLD
CODES
X10
PCB pins 2.54 mm
(0.100")
n/a
P
X13 7.62 mm
(0.300")
A10 PCB pins and
support plates
2.54 mm
(0.100")
n/a
E
A13 7.62 mm
(0.300")
Y00
Sold, lugs 4.65 mm
(0.183")
n/a
S
Y03 7.62 mm
(0.300")
SHAFT
Ø FMS OLD CODES
BB 1/8" 1/2" 32
BG 1/8" 5/8" 40
BH 1/8" 3/4" 48
BJ 1/8" 7/8" 56
GB 1/4" 1/2" 32
GG 1/4" 5/8" 40
GH 1/4" 3/4" 48
GJ 1/4" 7/8" 56
GL 1/4" 1" 64
GN 1/4" 1 1/4" 80
PART NUMBER DESCRIPTION (for information only)
148 1 0 F 0 GJ S X10 BO50 10K 10 % A e3
MODEL MODULES SWITCH BUSHING LOCATING
PEG SHAFT SHAFT LEADS PACK. VALUE TOL. TAPER SPECIAL SPECIAL LEAD
FINISH
RELATED DOCUMENTS
APPLICATION NOTES
Potentiometers and Trimmers www.vishay.com/doc?51001
Guidelines for Vishay Sfernice Resistive and Inductive Components www.vishay.com/doc?52029
0F0GJSX 0 0 K81 14 113A
Legal Disclaimer Notice
www.vishay.com Vishay
Revision: 08-Feb-17 1Document Number: 91000
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.
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Please contact authorized Vishay personnel to obtain written terms and conditions regarding products designed for
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