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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

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 M

Ω minimum, 500 VDC

Dielectric Strength

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 PART NUMBERING GUIDELINES

24

8

B

BH

S

0

E

B

25

1

0

3

M

L

MODEL

SHAFT

PACKAGING

OHMIC VALUE/TOL/LAW

OR

SPECIAL

See the end of this data book for conversion tables

SHAFT

MATERIAL

LEADS

BUSHING