248, 249
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Vishay Spectrol
1/2" (12.7 mm) Conductive Plastic and Cermet Potentiometers
FEATURES
• Model 248: 0.5 W at 70 °C (conductive plastic
element)
• Model 249: 1 W at 70 °C (cermet element)
• Cost effective panel potentiometer
• PCB mounting
• Tests according to CECC 41000 or IEC 60393-1
• Material categorization: for definitions of compliance
please see www.vishay.com/doc?99912
QUICK REFERENCE DATA
Multiple module
No
Switch module
n/a
Detent module
n/a
Special electrical laws
A: linear, L: logarithmic
Sealing level
IP 50
Lifespan
10K cycles
DIMENSIONS in millimeters (inches) ± 0.5 mm (± 0.02")
B
Screwdriver slot shown
in mid electrical travel
Mounting surface
12.7 ± 0.4
(0.500 ± 0.016)
9.5
(0.375)
10
(0.395)
1
(0.039)
A
12.7 ± 0.4
(0.500 ± 0.016)
S
8.5
(0.335)
0.6
(0.024)
C
0.6
(0.024)
0.36
(0.014)
5.08
(0.200)
2.54 ± 0.25
(0.100 ± 0.010)
2.54 ± 0.25
(0.100 ± 0.010)
A
VERSION BUSHING / SHAFT
B
SHAFT
C
S
BUSHING
SCREWDRIVER
Ø
L
Ø
SLOT
B / BH
1/8"
3/4"
1/4"
0.8
F / GJ
1/4"
7/8"
3/8"
1.2
Revision: 30-Aug-17
Document Number: 57054
1
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
248, 249
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Vishay Spectrol
ELECTRICAL SPECIFICATIONS
PARAMETER
Element type
MODEL 248
Conductive plastic
MODEL 249
Cermet
500 to 1 M
Total resistance range
Standard series
1, 2, 5
Resistance tolerance
± 20 %
± 20 % (on request ± 10 %)
0.5 W at 70 °C
1.0 W at 70 °C
0.5
POWER IN W
Linear
POWER IN W
Power rating
1
0
0
0
25 50 70
100 125 150
AMBIENT TEMPERATURE IN °C
0
25 50 70
100 125 150
AMBIENT TEMPERATURE IN °C
2
CW
Circuit diagram
3
1
Temperature coefficient of resistance (typical)
± 500 ppm/°C
± 150 ppm/°C
Linearity (typical)
± 5 % independent
Limiting element voltage
300 V
Contact resistance variation (typical)
5 % of the total resistance
Insulation resistance
1000 M minimum, 500 VDC
Dielectric strength
750 VRMS minimum 50 Hz / 60 Hz
2 maximum each end
End resistance
Effective electrical travel
265° ± 5°
MECHANICAL SPECIFICATIONS
MARKING
Mechanical travel
295° ± 5°
• Vishay model
Operating torque
0.1 Ncm to 2 Ncm
• Vishay logo
End stop torque
35 Ncm (50 oz.-inch)
• Variation law
Max. tightening torque
Weight
150 Ncm
8.3 g (0.29 oz.)
(1/4" x 7/8" FMF metal shaft)
• SAP code for ohmic value
• Tolerance in %
• Date code (4 digits)
• Terminal identification “3” for lead 3
ENVIRONMENTAL SPECIFICATIONS
Temperature range
Climatic category
Sealing
Revision: 30-Aug-17
-55 °C to +125 °C
55 / 125 / 4
IP 50
PACKAGING
• In box of 25 pieces, code BO25
Note
• Hardware supplied in separate bags
Document Number: 57054
2
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
248, 249
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Vishay Spectrol
PERFORMANCE
TESTS
CONDITIONS
TYPICAL VALUES AND DRIFTS FOR 249
RT/RT (%)
R1-2/R1-2 (%)
OTHER
1000 h at rated power
90’/30’ - ambient temp. 70 °C
±3%
±5%
Contact res. variation: < 1 %
Damp heat, steady state
4 days
40 °C 93 % HR
±2%
-
Dielectric strength: 1000 VRMS
Insulation resistance: > 104 M
Change of temperature
5 cycles, -55 °C at +125 °C
±1%
-
V1-2/V1-3 ± 2 %
Mechanical endurance
10 000 cycles
±3%
-
Contact res. variation: 2 % Rn
50 g’s at 11 ms
3 successive shocks
in 3 directions
±1%
±2%
-
10 Hz to 55 Hz, 0.75 mm or 10 g’s
during 6 h
±1%
-
V1-2/V1-3 ± 2 %
Electrical endurance
Shock
Vibration
Note
• Nothing stated herein shall be construed as a guarantee of quality or durability.
STANDARD RESISTANCE ELEMENT DATA
STANDARD
RESISTANCE
VALUES
248 LINEAR TAPER
MAX.
POWER
AT 70 °C
249 LINEAR TAPER
MAX.
WORKING
VOLTAGE
MAX.
WIPER
CURRENT
MAX.
POWER
AT 70 °C
MAX.
WORKING
VOLTAGE
MAX.
WIPER
CURRENT
W
V
mA
W
V
mA
500
0.5
15.8
32
1
22.4
45
1K
0.5
22.4
22
1
31.6
32
2K
0.5
31.6
16
1
44.7
22
2.5K
0.5
35.4
14
1
50.0
20
5K
0.5
50.0
10
1
70.7
14
10K
0.5
70.7
7
1
100
10
20K
0.5
100
5.0
1
141
7
25K
0.5
112
4.5
1
158
6
50K
0.5
158
3.2
1
224
4
100K
0.5
224
2.2
0.90
300
3.0
200K
0.45
300
1.50
0.45
300
1.5
250K
0.36
300
1.20
0.36
300
1.2
500K
0.18
300
0.60
0.18
300
0.6
1M
0.09
300
0.30
0.09
300
0.3
Revision: 30-Aug-17
Document Number: 57054
3
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
248, 249
www.vishay.com
Vishay Spectrol
ORDERING INFORMATION (part number)
2
4
8
MODEL
BUSHING
248 =
plastic
conductive
249 =
cermet
element
F = Ø 3/8"
B = Ø 1/4"
F
J
G
SHAFT
Ø
S
0
SHAFT END
L
GJ
1/4" 7/8"
BH
1/8" 3/4"
S = slotted
R = round
F = flatted
X
B
2
5
2
5
2
M
A
SHAFT
MATERIAL
LEADS
PACKAGING
RESISTANCE CODE /
TOLERANCE / TAPER OR
SPECIAL
0 = metal
X = std
B25 =
box of
25 pieces
Resistance:
From 501 = 500
to 105 = 1 M
Tolerance:
M = 20 %;
On request:
K = 10 % (249 only)
Taper:
A = linear;
L = logarithmic
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
Revision: 30-Aug-17
Document Number: 57054
4
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
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.
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.
© 2019 VISHAY INTERTECHNOLOGY, INC. ALL RIGHTS RESERVED
Revision: 01-Jan-2019
1
Document Number: 91000