RT100AL68R0KB Equivalent & Substitute Parts

Part Overview

The RT100AL68R0KB is a 68 Ohm, 100W wirewound potentiometer manufactured by Vishay Sfernice, designed for panel mount applications with a 1-turn rotation and solder lug termination. This component is classified as obsolete, making identification of functionally equivalent alternatives necessary for ongoing system maintenance and new design implementations where this specification remains applicable.

Substiute Parts

RT100AL68R0KB

Vishay SferniceIn Stock: 927RT100AL68R0KB Datasheet

Current PartRFQ

RKS75RE

OhmiteIn Stock: 1167RKS75RE Datasheet

MFR RecommendedRFQ

Key Parameters

Substitute Part Grouping Explanation

The RKS75RE from Ohmite qualifies as a substitute based on the following alignment of critical parameters:

• Power rating: Both components are rated at 100W
• Resistive material: Both utilize wirewound construction
• Termination style: Both feature solder lug termination
• Mounting configuration: Both are panel mount potentiometers
• Number of turns: Both are single-turn (1.0 Kierros) devices
• Rotation angle: Both provide 300° rotation
• Tolerance: Both maintain ±10% tolerance
• Number of gangs: Both are single gang configurations

The resistance value differs (68 Ohms vs. 75 Ohms), representing a 10.3% variance within the ±10% tolerance band of the original component. This variance falls within acceptable substitution parameters for wirewound potentiometer applications where the primary functional requirements are power dissipation capability, mechanical interface, and control range rather than precise resistance matching.

Parameter Comparison

Engineering Selection Recommendations

The RKS75RE serves as the manufacturer-recommended substitute for the obsolete RT100AL68R0KB. Selection of this alternative is supported by:

• Active product status ensuring continued availability and supply chain reliability
• ROHS3 compliance meeting current environmental and regulatory standards
• Identical power dissipation capability (100W) maintaining thermal performance requirements
• Matching mechanical interface specifications (panel mount, solder lug termination, 300° rotation)
• Resistance value within acceptable tolerance variance for wirewound potentiometer applications

The minor differences in actuator geometry (length and diameter) and taper specification (linear vs. unspecified) require verification against mechanical mounting constraints and control response characteristics specific to the application circuit.

Frequently Asked Questions (FAQ)

Q: Why is the resistance value different between the main part and substitute?

A: The RT100AL68R0KB specifies 68 Ohms while the RKS75RE provides 75 Ohms. This 7-Ohm difference represents a 10.3% variance, which falls within the ±10% tolerance specification common to both components. For wirewound potentiometer applications, this variance is acceptable when the primary design requirement is power handling capability rather than precise resistance matching.

Q: Are the mechanical interfaces compatible?

A: Both components feature panel mount configuration with solder lug termination and 300° rotation. However, the actuator dimensions differ slightly: the RT100AL68R0KB has a round actuator measuring 0.984" length and 0.236" diameter, while the RKS75RE features a flatted actuator measuring 0.875" length and 0.250" diameter. Verify that these dimensional differences accommodate the mechanical mounting and control interface of your application.

Q: What is the significance of the product status difference?

A: The RT100AL68R0KB is classified as obsolete, indicating discontinued manufacturing and limited inventory availability. The RKS75RE maintains active product status, ensuring reliable supply chain access and ongoing manufacturer support. This status difference is the primary driver for substitution in new designs and maintenance applications.

Q: Does the RoHS3 compliance of the substitute affect compatibility?

A: The RKS75RE is ROHS3 compliant, meeting current environmental and regulatory requirements for electronic components. The original RT100AL68R0KB does not specify RoHS status. ROHS3 compliance of the substitute enhances regulatory alignment for systems requiring environmental compliance documentation.

Q: What is the difference between the taper specifications?

A: The RT100AL68R0KB does not specify a taper characteristic, while the RKS75RE is designated as linear taper. Linear taper indicates proportional resistance change across the full rotation range. Verify that the linear taper response of the substitute matches the control characteristics required by your application circuit.