RT500AS68R0KB Equivalent & Substitute Parts

Part Overview

The RT500AS68R0KB is a 68 Ohm, 500W wirewound linear potentiometer manufactured by Vishay Sfernice, designed for panel mount applications with a 1-turn adjustment mechanism and solder turret termination. This component is classified as obsolete, making identification of functionally equivalent alternatives necessary for ongoing system maintenance and new design implementations where similar performance characteristics are required.

Substiute Parts

RT500AS68R0KB

Vishay SferniceIn Stock: 959RT500AS68R0KB Datasheet

Current PartRFQ

RUS75RE

OhmiteIn Stock: 841RUS75RE Datasheet

MFR RecommendedRFQ

Key Parameters

Substitute Part Grouping Explanation

The RUS75RE from Ohmite qualifies as a functional substitute based on the following alignment of critical parameters:

Both components share the core functional characteristics required for substitution: linear taper potentiometer design, 1-turn adjustment mechanism, wirewound resistive construction, panel mount configuration, and single-gang architecture. The resistance value differs by 10% (75 Ohms versus 68 Ohms), which falls within the ±10% tolerance specification common to both parts. The RUS75RE provides enhanced power handling capability at 1000W compared to the original 500W rating, representing a performance upgrade suitable for applications requiring higher dissipation margins. Rotation angle differs slightly (335° versus 300°), and termination style transitions from solder turret to solder lug, both of which are standard connection methods for panel mount potentiometers.

Parameter Comparison

Engineering Selection Recommendations

The RUS75RE represents the primary substitute for the obsolete RT500AS68R0KB. Selection of this alternative is supported by the active product status of the RUS75RE, ensuring long-term availability and supply chain continuity. The RUS75RE carries RoHS3 compliance certification, meeting current environmental and regulatory standards for electronic component manufacturing. The increased power rating of 1000W provides additional thermal margin in applications where the original 500W specification was marginal. The 10% resistance variance (75 Ohms versus 68 Ohms) remains within the tolerance band of both components and is acceptable for linear potentiometer applications where precise resistance matching is not a primary design constraint. Termination transition from solder turret to solder lug requires evaluation of the specific PCB or chassis mounting configuration to confirm mechanical and electrical compatibility.

Frequently Asked Questions (FAQ)

Q: Can the RUS75RE directly replace the RT500AS68R0KB without circuit modification?

A: The RUS75RE functions as an electrical equivalent within the tolerance specifications of both components. The 10% resistance difference falls within the ±10% tolerance band. However, physical mounting differences—specifically the transition from solder turret to solder lug termination and the change in actuator geometry from round to flatted—require verification of the mechanical mounting interface and connection method in the target application.

Q: What is the significance of the power rating increase from 500W to 1000W?

A: The RUS75RE's higher power rating indicates greater thermal dissipation capability and operational margin. This upgrade is beneficial for applications operating near the thermal limits of the original component and does not introduce compatibility issues in circuits designed for the lower 500W specification.

Q: How do the rotation angle differences (300° versus 335°) affect substitution?

A: Both rotation angles represent standard single-turn potentiometer designs. The 35° difference is minor and does not affect electrical function. Physical space constraints or mechanical stop positioning in the application enclosure should be evaluated to confirm the slightly larger rotation arc of the RUS75RE is accommodated.

Q: What is the impact of changing from solder turret to solder lug termination?

A: Solder turret and solder lug are both standard termination methods for panel mount potentiometers. The selection between them depends on the PCB layout, wire gauge, and soldering process used in the target application. Solder lug termination typically accommodates larger gauge wires and is suitable for high-current applications.

Q: Is the RUS75RE suitable for new designs, or only for replacement of obsolete units?

A: The RUS75RE is classified as active product status and carries current regulatory compliance certifications (RoHS3). It is suitable for both replacement applications and new design implementations where the specified electrical and mechanical characteristics align with system requirements.