248, 249
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Revision: 30-Aug-17 1Document Number: 57054
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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")
VERSION BUSHING / SHAFT
ABCS
SHAFT BUSHING SCREWDRIVER
ØLØSLOT
B / BH 1/8" 3/4" 1/4" 0.8
F / GJ 1/4" 7/8" 3/8" 1.2
8.5
(0.335)
2.54 ± 0.25
(0.100 ± 0.010)
12.7 ± 0.4
(0.500 ± 0.016)
B
0.36
(0.014)
0.6
(0.024)
C
A
9.5
(0.375)
10
(0.395)
1
(0.039)
5.08
(0.200)
Mounting surface
12.7 ± 0.4
(0.500 ± 0.016)
Screwdriver slot shown
in mid electrical travel
S
0.6
(0.024)
2.54 ± 0.25
(0.100 ± 0.010)
248, 249
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Revision: 30-Aug-17 2Document Number: 57054
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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
Hardware supplied in separate bags
ELECTRICAL SPECIFICATIONS
PARAMETER MODEL 248 MODEL 249
Element type Conductive plastic Cermet
Total resistance range 500 to 1 M
Standard series 1, 2, 5
Resistance tolerance ± 20 % ± 20 % (on request ± 10 %)
Power rating Linear
0.5 W at 70 °C 1.0 W at 70 °C
Circuit diagram
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
End resistance 2 maximum each end
Effective electrical travel 265° ± 5°
050 150
125
0
AMBIENT TEMPERATURE IN °C
POWER IN W
7025 100
0.5
050 150
125
0
AMBIENT TEMPERATURE IN °C
POWER IN W
7025 100
1
1
2
3
CW
MECHANICAL SPECIFICATIONS
Mechanical travel 295° ± 5°
Operating torque 0.1 Ncm to 2 Ncm
End stop torque 35 Ncm (50 oz.-inch)
Max. tightening torque 150 Ncm
Weight 8.3 g (0.29 oz.)
(1/4" x 7/8" FMF metal shaft)
ENVIRONMENTAL SPECIFICATIONS
Temperature range -55 °C to +125 °C
Climatic category 55 / 125 / 4
Sealing IP 50
MARKING
•Vishay model
•Vishay logo
•Variation law
SAP code for ohmic value
Tolerance in %
Date code (4 digits)
Terminal identification “3” for lead 3
PACKAGING
In box of 25 pieces, code BO25
248, 249
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Revision: 30-Aug-17 3Document Number: 57054
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.
PERFORMANCE
TESTS CONDITIONS TYPICAL VALUES AND DRIFTS FOR 249
RT/RT (%) R1-2/R1-2 (%) OTHER
Electrical endurance 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
Shock
50 g’s at 11 ms
3 successive shocks
in 3 directions
± 1 % ± 2 % -
Vibration 10 Hz to 55 Hz, 0.75 mm or 10 g’s
during 6 h ± 1 % - V1-2/V1-3 ± 2 %
STANDARD RESISTANCE ELEMENT DATA
STANDARD
RESISTANCE
VALUES
248 LINEAR TAPER 249 LINEAR TAPER
MAX.
POWER
AT 70 °C
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
248, 249
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Revision: 30-Aug-17 4Document Number: 57054
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ARE SUBJECT TO SPECIFIC DISCLAIMERS, SET FORTH AT www.vishay.com/doc?91000
ORDERING INFORMATION (part number)
MODEL BUSHING SHAFT SHAFT END SHAFT
MATERIAL LEADS PACKAGING
RESISTANCE CODE /
TOLERANCE / TAPE R OR
SPECIAL
248 =
plastic
conductive
249 =
cermet
element
F = Ø 3/8"
B = Ø 1/4"
Ø L S = slotted
R = round
F = flatted
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
GJ 1/4" 7/8"
BH 1/8" 3/4"
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
GJS0XB 5 5 M82 F4 222A
Legal Disclaimer Notice
www.vishay.com Vishay
Revision: 08-Feb-17 1Document Number: 91000
Disclaimer
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“Vishay”), disclaim any and all liability for any errors, inaccuracies or incompleteness contained in any datasheet or in any other
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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
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including but not limited to the warranty expressed therein.
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