248, 249
www.vishay.com
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
DIMENSIONS
in millimeters (inches) ± 0.5 mm (± 0.02")
X = Standards leads
METAL OR PLASTIC SHAFTS
Screwdriver slot shown in mid
electrical travel
12.7 (0.500) ± 0.4
0.8 (0.30) wide × 0.8 (0.03) deep
Ø 6.35 (0.250)
- 0.0
0.5
12.7 (0.500) ± 0.4
22.22 (0.875) ± 0.75
7.6 (0.300) ± 0.4
9.5 (0.375)
Mounting
surface
0.41 (0.016)
6.9 (0.272)
2.54 (0.100) ± 0.25
2.54 (0.100) ± 0.25
0.5 (0.020)
3/8" - 32 NEF - 2A
5.08 (0.200) ± 0.25
0.36 (0.014)
METAL SHAFT
1/4" - 32 NEF - 2A
VISHAY
Ø 3.18 (0.125) ± 0.025
9.5 (0.375)
19.05 (0.750) ± 0.75
Terminal
pins x 3
E = Rear stand off
D = Rear locating lugs
PCB surface.
6.76
(0.266)
3.18
3.18
(0.125)
0.36
2.54
3.14
7.62
2.34
8.5
12.70
MTGLUG CI.
1.0 typ.
10.16
2.55 typ.
Revision: 22-Sep-15
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
www.vishay.com
Vishay Spectrol
MODEL 248
Conductive plastic
500
to 1 M
1, 2, 5
± 20 %
0.5 W at 70 °C
1
POWER IN W
ELECTRICAL SPECIFICATIONS
PARAMETER
Element type
Total resistance range
Standard series
Resistance tolerance
MODEL 249
Cermet
± 20 % (on request ± 10 %)
1.0 W at 70 °C
0.5
Power rating
Linear
POWER IN W
0
0
25 50 70
100 125 150
AMBIENT TEMPERATURE IN °C
0
0
25 50 70
100 125 150
AMBIENT TEMPERATURE IN °C
2
CW
Circuit diagram
1
3
Temperature coefficient of resistance (typical)
Linearity (typical)
Limiting element voltage
Contact resistance variation (typical)
Insulation resistance
Dielectric strength
End resistance
Effective electrical travel
± 500 ppm/°C
± 5 % independent
300 V
5 % of the total resistance
± 150 ppm/°C
1000 M minimum, 500 V
DC
750 V
RMS
minimum 50 Hz/60 Hz
2
maximum each end
265° ± 5°
MECHANICAL SPECIFICATIONS
Mechanical travel
Operating torque
End stop Torque
Max. tightening
Torque
Weight
1/4" Bush
3/8" Bush
295° ± 5°
0.1 Ncm to 2 Ncm
35 Ncm (50 oz.-inch)
50 Ncm
70 Ncm
8.3 g (0.29 oz.)
(1/4" x 7/8" FMF metal shaft)
MARKING
• Vishay trademark
• Part number
• Tolerance
• Date code
• Terminal identification
ENVIRONMENTAL SPECIFICATIONS
Temperature range
Climatic category
Sealing
-55 °C to +125 °C
55/125/4
IP50
-
PACKAGING
In box of 50 pieces, code B25 (BO50)
Revision: 22-Sep-15
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
www.vishay.com
Vishay Spectrol
TYPICAL VALUES AND DRIFTS FOR 249
R
T
/R
T
(%)
±3%
±2%
±1%
±3%
±1%
±1%
R
1-2
/R
1-2
(%)
±5%
-
-
-
±2%
-
OTHER
Contact res. variation: < 1 %
Dielectric strength: 1000 V
RMS
Insulation resistance: > 10
4
M
V
1-2
/V
1-3
± 2 %
Contact res. variation:
2 % Rn
-
V
1-2
/V
1-3
± 2 %
PERFORMANCE
TESTS
Electrical endurance
Damp heat, steady state
Change of temperature
Mechanical endurance
Shock
Vibration
CONDITIONS
1000 h at rated power
90’/30’ - ambient temp. 70 °C
4 days
40 °C 93 % HR
5 cycles, -55 °C at +125 °C
10 000 cycles
50
g’s
at 11 ms
3 successive shocks
in 3 directions
10 Hz to 55 Hz, 0.75 mm or 10
g’s
during 6 h
Note
• Nothing stated herein shall be construed as a guarantee of quality or durability.
STANDARD RESISTANCE ELEMENT DATA
STANDARD
RESISTANCE
VALUES
500
1K
2K
2.5K
5K
10K
20K
25K
50K
100K
200K
250K
500K
1M
248 LINEAR TAPER
MAX.
POWER
AT 70 °C
W
0.5
0.5
0.5
0.5
0.5
0.5
0.5
0.5
0.5
0.5
0.45
0.36
0.18
0.09
MAX.
WORKING
VOLTAGE
V
15.8
22.4
31.6
35.4
50.0
70.7
100
112
158
224
300
300
300
300
MAX.
WIPER
CURRENT
mA
32
22
16
14
10
7
5.0
4.5
3.2
2.2
1.50
1.20
0.60
0.30
MAX.
POWER
AT 70 °C
W
1
1
1
1
1
1
1
1
1
0.90
0.45
0.36
0.18
0.09
249 LINEAR TAPER
MAX.
WORKING
VOLTAGE
V
22.4
31.6
44.7
50.0
70.7
100
141
158
224
300
300
300
300
300
MAX.
WIPER
CURRENT
mA
45
32
22
20
14
10
7
6
4
3.0
1.5
1.2
0.6
0.3
Revision: 22-Sep-15
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
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.
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.
Vishay Intertechnology, Inc. hereby certifies that all its products that are identified as Halogen-Free follow Halogen-Free
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
conform to JEDEC JS709A standards.
Revision: 02-Oct-12
1
Document Number: 91000
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