Datasheet

www.vishay.com For technical questions, contact: [e-mail] Document Number: 57054
112 See also Application Notes: www.vishay.com/doc?51001
and www.vishay.com/doc?52029 Revision: 26-Jan-11
248, 249
Vishay Spectrol
1/2" (12.7 mm) Conductive Plastic and Cermet
Potentiometer
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) ± 1000 ppm/°C ± 150 ppm/°C
Linearity (Typical) ± 5 % independent
Limitng Element Voltage 300 V
Contact Resistance Variation 5 % of the total resistance
Insulation Resistance 1000 M minimum, 500 V
DC
Dielectric Strength 750 V
RMS
minimum 50 Hz/60 Hz
End Resistance 2  maximum each end
Effective Electrical Travel 265° ± 5°
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
1/4" Bush 50 Ncm
3/8" Bush 70 Ncm
Weight
8.3 g (0.29 oz.)
(1/4" x 7/8" FMF metal shaft)
0
50
150
125
0
AMBIENT TEMPERATURE IN °C
POWER IN W
7025
100
0.5
0
50
150
125
0
AMBIENT TEMPERATURE IN °C
POWER IN W
7025
100
1
1
2
3
CW
ENVIRONMENTAL SPECIFICATIONS
Temperature Range - 55 °C to 125 °C
Climatic Category 55/125/4
Sealing IP50