RT100AL4R70KB Equivalent & Substitute Parts

Part Overview

The RT100AL4R70KB is a 4.7 Ohm, 100W wirewound potentiometer manufactured by Vishay Sfernice, designed for panel mount applications with a 1-turn adjustment mechanism 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

RT100AL4R70KB

Vishay SferniceIn Stock: 732RT100AL4R70KB Datasheet

Current PartRFQ

RKS5R0E

OhmiteIn Stock: 723RKS5R0E Datasheet

MFR RecommendedRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution of the RT100AL4R70KB is based on the following critical parameters that must align for functional equivalence:

• Power Rating: 100W minimum requirement
• Resistive Material: Wirewound construction
• Termination Style: Solder Lug connection
• Mounting Type: Panel Mount configuration
• Number of Turns: 1-turn adjustment
• Rotation Angle: 300° mechanical rotation
• Tolerance: ±10% resistance tolerance

The RKS5R0E from Ohmite meets these core substitution criteria. While the resistance value differs at 5 Ohms compared to 4.7 Ohms, this represents a 6.4% variance within the ±10% tolerance band of the original specification, making it functionally equivalent for applications where the potentiometer serves as a load resistor or adjustment element rather than a precision reference.

Parameter Comparison

Engineering Selection Recommendations

The RKS5R0E is the designated manufacturer-recommended substitute for the RT100AL4R70KB. Selection of this alternative is supported by the following factors:

• Product Status: The RKS5R0E maintains active production status, ensuring long-term availability and supply chain continuity compared to the obsolete RT100AL4R70KB.
• Regulatory Compliance: The RKS5R0E carries ROHS3 compliance certification, meeting current environmental and material restriction standards for electronic components.
• Functional Equivalence: All critical electrical and mechanical parameters align within acceptable engineering tolerances, including power dissipation capacity, adjustment range, and termination compatibility.
• Inventory Availability: Both components maintain adequate stock levels (719 Pcs and 707 Pcs respectively), supporting immediate procurement requirements.

Frequently Asked Questions (FAQ)

Q: Can the RKS5R0E directly replace the RT100AL4R70KB in existing assemblies?

A: Yes. The RKS5R0E meets all functional substitution criteria including 100W power rating, wirewound construction, solder lug termination, panel mount configuration, and 1-turn adjustment mechanism. The 5 Ohm resistance value falls within the ±10% tolerance specification of the original 4.7 Ohm component.

Q: What is the significance of the resistance difference between 4.7 Ohms and 5 Ohms?

A: The 0.3 Ohm difference represents a 6.4% variance, which is contained within the ±10% tolerance band specified for both components. This variance is acceptable for potentiometer applications where the component functions as an adjustable load or control element.

Q: Are there mechanical compatibility concerns with the RKS5R0E?

A: Both components feature panel mount configuration with solder lug termination and 300° rotation. Minor dimensional differences exist in actuator length and diameter (RKS5R0E: 0.875" length, 0.250" diameter versus RT100AL4R70KB: 0.984" length, 0.236" diameter), which may require mechanical bracket or mounting adjustment depending on specific panel cutout specifications.

Q: Does the RKS5R0E offer any advantages over the original RT100AL4R70KB?

A: The RKS5R0E provides active product status with ongoing manufacturer support and ROHS3 compliance certification, ensuring compatibility with current environmental regulations and supply chain standards.

Q: What packaging format is available for the RKS5R0E?

A: The RKS5R0E is supplied in bulk packaging, consistent with standard potentiometer distribution for industrial and OEM applications.