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 Mounting surface
in mid electrical travel

12.7 ± 0.4
(0.500 ± 0.016) 9.5 10 1
S (0.375) (0.395) (0.039)
(0.500 ± 0.016)
12.7 ± 0.4

C
(0.024)
0.6

(0.335)

0.6
8.5

(0.024) 0.36
(0.014)

5.08
(0.200)

2.54 ± 0.25 2.54 ± 0.25

(0.100 ± 0.010) (0.100 ± 0.010)

A B C S
VERSION BUSHING / SHAFT SHAFT 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: 18-Sep-2024 1 Document Number: 57054

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Vishay Spectrol

ELECTRICAL SPECIFICATIONS
PARAMETER MODEL 248 MODEL 249
Element type Conductive plastic Cermet
Total resistance range 1 kΩ to 500 kΩ 500 Ω to 1 MΩ
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 1

POWER IN W

POWER IN W
Power rating Linear

0 0
0 25 50 70 100 125 150 0 25 50 70 100 125 150
AMBIENT TEMPERATURE IN °C AMBIENT TEMPERATURE IN °C

CW
Circuit diagram

1 3

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 MΩ minimum, 500 VDC

Dielectric strength 750 VRMS minimum 50 Hz / 60 Hz
End resistance 2 Ω maximum each end
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 150 Ncm • SAP code for ohmic value
8.3 g (0.29 oz.) • Tolerance in %
Weight
(1/4" x 7/8" FMF metal shaft) • Date code (4 digits)
• Terminal identification “3” for lead 3

ENVIRONMENTAL SPECIFICATIONS
Temperature range -55 °C to +125 °C
PACKAGING
Climatic category 55 / 125 / 4
• In box of 25 pieces, code BO25
Sealing IP 50
Note
• Hardware supplied in separate bags

Revision: 18-Sep-2024 2 Document Number: 57054

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Vishay Spectrol

PERFORMANCE
TYPICAL VALUES AND DRIFTS FOR 249
TESTS CONDITIONS
ΔRT/RT (%) ΔR1-2/R1-2 (%) OTHER
1000 h at rated power
Electrical endurance ±3% ±5% Contact res. variation: < 1 %
90’/30’ - ambient temp. 70 °C
4 days Dielectric strength: 1000 VRMS
Damp heat, steady state ±2% -
40 °C 93 % HR Insulation resistance: > 104 MΩ
Change of temperature 5 cycles, -55 °C at +125 °C ±1% - ΔV1-2/V1-3 ≤ ± 2 %
Mechanical endurance 10 000 cycles ±3% - Contact res. variation: ≤ 2 % Rn
50 g’s at 11 ms
Shock 3 successive shocks ±1% ±2% -
in 3 directions
10 Hz to 55 Hz, 0.75 mm or 10 g’s
Vibration ±1% - ΔV1-2/V1-3 ≤ ± 2 %
during 6 h
Note
• Nothing stated herein shall be construed as a guarantee of quality or durability

STANDARD RESISTANCE ELEMENT DATA

248 LINEAR TAPER 249 LINEAR TAPER
STANDARD
RESISTANCE MAX. MAX. MAX. MAX. MAX. MAX.
VALUES POWER WORKING WIPER POWER WORKING WIPER
AT 70 °C VOLTAGE CURRENT AT 70 °C VOLTAGE CURRENT
Ω 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: 18-Sep-2024 3 Document Number: 57054

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ORDERING INFORMATION (part number)

2 4 8 F G J S 0 X B 2 5 2 5 2 M A

RESISTANCE CODE /
SHAFT
MODEL BUSHING SHAFT SHAFT END LEADS PACKAGING TOLERANCE / TAPER
MATERIAL
OR SPECIAL
248 = F = Ø 3/8" Ø L S = slotted 0 or P = metal X = std B25 = Resistance:
plastic B = Ø 1/4" GJ 1/4" 7/8" R = round box of From 501 = 500 Ω
conductive F = flatted 25 pieces to 105 = 1 MΩ
249 = BH 1/8" 3/4"
cermet Tolerance:
element M = 20 %;
On request:
K = 10 % (249 only)

Taper:
A = linear;
L = logarithmic

ACCESSORIES
Additional Accessories (to order separately) www.vishay.com/doc?51051
Control knobs www.vishay.com/doc?51101

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: 18-Sep-2024 4 Document Number: 57054

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 Legal Disclaimer Notice
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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
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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,
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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
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Vishay products are not designed for use in life-saving or life-sustaining applications or any application in which the failure of
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Revision: 01-Jan-2025 1 Document Number: 91000

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