RT100AL2500KB Equivalent & Substitute Parts

Part Overview

The RT100AL2500KB is a 250 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 suitable substitute parts essential for ongoing system maintenance and new design implementations where equivalent functionality is required.

Substiute Parts

RT100AL2500KB

Vishay SferniceIn Stock: 1056RT100AL2500KB Datasheet

Current PartRFQ

RLS250E

OhmiteIn Stock: 1019RLS250E Datasheet

MFR RecommendedRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution of the RT100AL2500KB is determined by matching the following critical parameters:

• Resistance value: 250 Ohms (exact match required)
• Resistive material: Wirewound construction
• Termination style: Solder Lug
• Mounting configuration: Panel Mount
• Number of turns: 1-turn operation
• Rotation angle: 300° mechanical rotation

The RLS250E from Ohmite satisfies all core substitution criteria. While the RLS250E provides a higher power rating (150W versus 100W), this represents an enhancement rather than a limitation, as the substitute maintains all functional and mechanical compatibility parameters with the original RT100AL2500KB.

Parameter Comparison

Engineering Selection Recommendations

The RLS250E is the designated manufacturer-recommended substitute for the RT100AL2500KB. Selection of this substitute is supported by the following factors:

• The RLS250E maintains active product status, ensuring continued availability and supply chain reliability
• RoHS3 compliance of the RLS250E provides environmental and regulatory alignment for modern applications
• The increased power rating (150W) provides operational margin beyond the original 100W specification
• All mechanical and electrical parameters remain compatible with the original design intent
• Solder lug termination and panel mount configuration enable direct integration into existing assemblies

Frequently Asked Questions (FAQ)

Q: Can the RLS250E directly replace the RT100AL2500KB in existing designs?

A: Yes. The RLS250E maintains identical resistance value, tolerance, number of turns, rotation angle, termination style, and mounting configuration. The higher power rating represents an enhancement that does not compromise compatibility.

Q: What is the significance of the higher power rating on the RLS250E?

A: The RLS250E is rated for 150W compared to the original 100W specification. This higher rating provides additional thermal margin and operational headroom, making it suitable for applications where the original component was specified.

Q: Are there mechanical differences between these potentiometers?

A: Both components feature panel mount configuration with solder lug termination. The RLS250E has a slightly shorter actuator length (0.875" versus 0.984") and a marginally larger actuator diameter (0.250" versus 0.236"). These differences are within typical mechanical tolerances for panel mount potentiometers and do not prevent substitution.

Q: What is the taper difference between the two parts?

A: The RT100AL2500KB does not specify a taper characteristic, while the RLS250E is specified as linear taper. Linear taper provides predictable resistance variation across the rotation range and is standard for general-purpose potentiometer applications.

Q: Does the RLS250E meet current compliance standards?

A: Yes. The RLS250E is RoHS3 compliant and carries an ECCN classification of EAR99, meeting current environmental and export compliance requirements.