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
RoHS
COMPLIANT
DIMENSIONS
in millimeters (inches)
METAL OR PLASTIC SHAFTS
X = STANDARD LEADS
SCREWDRIVER SLOT SHOWN IN MID
ELECTRICAL TRAVEL
12.7 (0.500) ± 0.4
7.6 (0.300) ± 0.4
0.8 (0.30) WIDE × 0.8 (0.03) DEEP
0.0
Ø 6.35 (0.250) - 0.05
9.5 (0.375)
22.22 (0.875) ± 0.75
MOUNTING
SURFACE
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)
MARKING -
MODEL & RESISTANCE
DATA CODE
3/8" - 32 NEF - 2A
0.36 (0.014)
5.08 (0.200) ± 0.25
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 × 3
E = REAR STAND OFF
P.C. BOARD
SURFACE
6.76
(0.266)
3.18
D = REAR LOCATING LUGS
2.34
3.14
7.62
8.5
3.18
(0.125)
0.36
2.54
1.0 TYP
10.16
2.55 TYP
2
CW
12.70
MTGLUG CI.
1
3
Tolerance unless otherwise
specified ± 0.5
www.vishay.com
111
Document Number: 57054
Revision: 02-Jul-07
For technical questions, contact: sfer@vishay.com
248, 249
Vishay Spectrol
1/2" (12.7 mm) Conductive Plastic & Cermet
Potentiometers
ELECTRICAL SPECIFICATIONS
PARAMETER
Element Type
Total Resistance Range
Resistance Tolerance
Power rating
Temperature Coefficient of Resistance
Linearity Tolerance
Contact Resistance Variation
Insulation Resistance
Dielectric Strength
End Resistance
Effective Electrical Angle
MODEL 248
conductive plastic
MODEL 249
cermet
500
Ω
to 1 MΩ
± 20 %
± 20 % (on request ± 10 %)
0.5 W at 70 °C
1.0 W at 70 °C
Both derated to zero at 125 °C
± 1000 ppm/°C
± 100 ppm/°C
± 5 % Independent
5 % of the Total Resistance
1000 MΩ minimum, 500 VDC
750 V
RMS
minimum 50/60 Hz
2
Ω
maximum each end
265° ± 5°
MECHANICAL SPECIFICATIONS
Rotation
Torque
End Stop Torque
Weight
Max Tightening Torque
Sealing
295° ± 5°
Starting and Running
1.5 to 18.75 mNm
0.35 Nm (50 oz-in)
8.3 g’s (0.29 oz)
(1/4" × 7/8" FMF metal shaft)
0.50 Nm (1/4" Bush)
0.70 Nm (3/8" Bush)
IP50
ENVIRONMENTAL SPECIFICATIONS
Temperature Range
Shock
Vibrations
Rotational Life (Electrical)
Load Life at 70 °C
- 55 °C to + 125 °C
390 meters/sec/sec.
1000 bumps
98 meters/sec/sec.
0.75 mm, 10 to 500 Hz
25 000 cycles
1000 hours
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
MARKING
Unit identification: Manufacturer’s name and model number, EIA resistance value coding, tolerance, data code and terminal
Identification
.
ORDERING INFORMATION
248
MODEL
248/249
JE
SPECIAL FEATURES
D:
Rear locating lugs
E:
Rear stand off
J:
CW audio taper
8
SHAFT OPTIONS
7:
6.35 (1/4") plastic
8:
3.18 (1/8") plated
brass
9:
6.35 (1/4") plated
brass
08
FMF SHAFT OPTIONS
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
103
EIA RESISTANCE CODE
e3
LEAD FINISH
e3:
pure Sn
Example:
248 - JE - 8 - 08 - 103
SAP PART NUMBERING GUIDELINES
2
4
8
B
B
H
S
0
E
B
2
5
1
0
3
M
L
MODEL
BUSHING
SHAFT
SHAFT LEADS
MATERIAL
PACKAGING
OHMIC
V
ALUE/TOL/LA
W
OR
SPECIAL
See the end of this data
book
for conversion tables
www.vishay.com
112
For technical questions, contact: sfer@vishay.com
Document Number: 57054
Revision: 02-Jul-07
Legal Disclaimer Notice
Vishay
Disclaimer
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
document or by any conduct of Vishay.
The products shown herein are not designed for use in medical, life-saving, or life-sustaining applications unless
otherwise expressly indicated. Customers using or selling Vishay products not expressly indicated for use in such
applications do so entirely at their own risk and agree to fully indemnify Vishay for any damages arising or resulting
from such use or sale. Please contact authorized Vishay personnel to obtain written terms and conditions regarding
products designed for such applications.
Product names and markings noted herein may be trademarks of their respective owners.
Document Number: 91000
Revision: 18-Jul-08
www.vishay.com
1
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