Document Number: 57054 For technical questions, contact: sfer@vishay.com www.vishay.com
Revision: 02-Jul-07 111
248, 249
Vishay Spectrol
1/2" (12.7 mm) Conductive Plastic & Cermet
Potentiometers
FEATURES
•Model 248/249 retains the proven high
performance characteristics in a more cost
effective package
•Cost effective panel potentiometers
•P.C.B. mounting potentiometers
DIMENSIONS in millimeters (inches)
METAL OR PLASTIC SHAFTS
RoHS
COMPLIANT
VISHA Y
SCREWDRIVER SLOT SHOWN IN MID
ELECTRICAL TRAVEL
12.7 (0.500) ± 0. 4
0.8 (0.30) WIDE × 0.8 (0.03) DEEP
12.7 (0.500) ± 0. 4
0.41 (0.016)
6.9 (0.272)
2.54 (0.100) ± 0.25
2.54 (0.100) ± 0.25
0.5 (0.020)
1/4" - 32 NEF - 2A
Ø 3.18 (0.125) ± 0.025
19.05 (0.750) ± 0.75
MARKING -
MODEL & RESIST ANCE
D ATA C OD E
TERMINAL
PINS × 3
22.22 (0.875) ± 0.75 MOUNTING
SURF ACE
7.6 (0.300) ± 0. 4
9.5 (0.375)
3/8" - 32 NEF - 2A
5.08 (0.200) ± 0.25
0.36 (0.014)
0. 0
Ø 6.35 (0.250) - 0.05
9.5 (0.375)
0.36
2.54
P. C. BOARD
SURF ACE
1.0 TYP
10.16
6.76
(0.266)
3.18
2.55 TY P
3.18
(0.125)
METAL SHAFT
D = REAR LOCATING LUGSE = REAR STAND OFF
8.5
2.34
12.70
MTGLUG CI.
3.14
7.62
X = STANDARD LEADS
Tolerance unless otherwise
specified ± 0.5
1
2
3
CW
www.vishay.com For technical questions, contact: sfer@vishay.com Document Number: 57054
112 Revision: 02-Jul-07
248, 249
Vishay Spectrol 1/2" (12.7 mm) Conductive Plastic & Cermet
Potentiometers
MECHANICAL SPECIFICATIONS
Rotation 295° ± 5°
Torque Starting and Running
1.5 to 18.75 mNm
End Stop Torque 0.35 Nm (50 oz-in)
Weight 8.3 g’s (0.29 oz)
(1/4" × 7/8" FMF metal shaft)
Max Tightening Torque 0.50 Nm (1/4" Bush)
0.70 Nm (3/8" Bush)
Sealing IP50
ENVIRONMENTAL SPECIFICATIONS
Temperature Range - 55 °C to + 125 °C
Shock 390 meters/sec/sec.
1000 bumps
Vibrations 98 meters/sec/sec.
0.75 mm, 10 to 500 Hz
Rotational Life (Electrical) 25 000 cycles
Load Life at 70 °C 1000 hours
MARKING
Unit identification: Manufacturer’s name and model number, EIA resistance value coding, tolerance, data code and terminal
Identification.
ELECTRICAL SPECIFICATIONS
PARAMETER MODEL 248 MODEL 249
Element Type conductive plastic cermet
Total Resistance Range 500 Ω to 1 MΩ
Resistance Tolerance ± 20 % ± 20 % (on request ± 10 %)
Power rating 0.5 W at 70 °C 1.0 W at 70 °C
Both derated to zero at 125 °C
Temperature Coefficient of Resistance ± 1000 ppm/°C ± 100 ppm/°C
Linearity Tolerance ± 5 % Independent
Contact Resistance Variation 5 % of the Total Resistance
Insulation Resistance 1000 MΩ minimum, 500 VDC
Dielectric Strength 750 VRMS minimum 50/60 Hz
End Resistance 2 Ω maximum each end
Effective Electrical Angle 265° ± 5°
STANDARD RESISTANCE ELEMENT DATA
Ω
248/249:
500R, 1K, 2K, 5K, 10K, 25K, 50K, 100K, 250K,
500K, 1M
PACKAGING
Carton box of 50, code: BO50
ORDERING INFORMATION
248
MODEL
JE
SPECIAL FEATURES
8
SHAFT OPTIONS
08
FMF SHAFT OPTIONS
103
EIA RESISTANCE CODE
e3
LEAD FINISH
248/249 D: Rear locating lugs
E: Rear stand off
J: CW audio taper
7: 6.35 (1/4") plastic
8: 3.18 (1/8") plated
brass
9: 6.35 (1/4") plated
brass
08: 19.05 (3/4") for
3.18 (1/8") plated brass
10: 22.22 (7/8") for
6.35 (1/4") plated brass
or plastic versions
e3: pure Sn
Example: 248 - JE - 8 - 08 - 103
SAP PA RT NUMBERING GUIDELINES
248BBH S 0 E B25 10 3 ML
MODE L SHAFT PA CKAGIN G OHMIC V ALUE/T OL/LA W
OR
SPECIAL
See the end of this data book for conversion tables
SHAFT
MA TERIAL
LEAD S
BUSHIN G
Document Number: 91000 www.vishay.com
Revision: 18-Jul-08 1
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Vishay
All product specifications and data are subject to change without notice.
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 herein
or in any other disclosure relating to any product.
Vishay disclaims any and all liability arising out of the use or application of any product described herein or of any
information provided herein to the maximum extent permitted by law. The product specifications do not expand or
otherwise modify Vishay’s terms and conditions of purchase, including but not limited to the warranty expressed
therein, which apply to these products.
No license, express or implied, by estoppel or otherwise, to any intellectual property rights is granted by this
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The products shown herein are not designed for use in medical, life-saving, or life-sustaining applications unless
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