2" (50.8 mm) Single Turn Conductive Plastic

Precision Potentiometer

Model 308

Vishay Spectrol

www.vishay.com

For technical questions, contact: sfer@vishay.com

Document Number: 57058

38

Revision: 22-Mar-07

FEATURES

• Bushing mount and servo mount types available

• Virtually infinite resolution

• Up to 6 sections available

• Rotational life exceeds 20 million shaft revolutions

• Co-Molded track and Multi-Finger wiper provide low noise

signal

• Large ohmic value range: 500 Ω to 100 kΩ

RoHS

COMPLIANT

ELECTRICAL SPECIFICATIONS

PARAMETER

Total Resistance

Standard Range

500

Ω to 100 kΩ

Tolerance

STANDARD

± 10 %

SPECIAL

± 5 %

Linearity (Independent)

STANDARD

± 0.25 %

SPECIAL

± 0.05 %

Electrical Angle

350° ± 2°

Power Rating

Section 1

Additional Sections

75 % of the rating of section 1

Output Smoothness

0.1 % maximum

Insulation Resistance

1000 M

Ω minimum 500 V

DC

Dielectric Strength

Taps (Extra)

Extra taps available as special

Phasing

Points at which output ratio is 0.5 aligned ± 1° (ref. to section 1)

Temperature Coefficient of Resistance

± 400 ppm/°C maximum

MATERIAL SPECIFICATIONS

Housing and Lids

Aluminum, anodized

Shaft and Clamp Rings

Stainless steel, non-magnetic

non-passivated

Terminals

Brass, gold plated for solderability

Bushing Mount Hardware

Lockwasher Internal Tooth:

Panel Nut:

Steel, nickel plated

Brass, nickel plated

ENVIRONMENTAL SPECIFICATIONS

Vibration

15 g thru 2000 Hz

Shock

50 g

Salt Spray

96 h

Rotational Life

Servo: 20 million shaft revolutions

Bushing: 5 million shaft revolutions

Load Life

900 h

Temperature Range

- 55 °C to + 125 °C

ORDERING INFORMATION/DESCRIPTION

The Model 308 can be ordered from this data sheet with a variety of alternate characteristics, as shown. For most rapid service on your order,

please state:

308

B

1

20K

BO1

MODEL

MOUNTING

NUMBER OF SECTIONS

TOTAL RESISTANCE OF EACH SECTION

PACKAGING

B: Bushing

S: Servo

Up to 6

Beginning with the section nearest the mounting end

Box of 1 piece

Other characteristics will be standard as described on this data sheet. If special characteristics are required, such as: special linearity tolerance,

special resistance tolerance, extra taps, non-linear functions, etc., please state these on your order and allow additional lead time for delivery.

SAP PART NUMBERING GUIDELINES

308

S

1

203

B01

MODEL

STYLE

GANG NUMBER

B: Bushing

S: Servo

From 1 up to 6

20K