RT100AS4701KB Equivalent & Substitute Parts

Part Overview

The RT100AS4701KB is a 4.7k Ohm wirewound potentiometer rated for 100W power dissipation, manufactured by Vishay Sfernice. This panel mount component features a 1-turn design with solder lug termination and 300° rotation. The part is currently obsolete, necessitating identification of functionally equivalent alternatives for ongoing applications and new designs.

Substiute Parts

RT100AS4701KB

Vishay SferniceIn Stock: 1040RT100AS4701KB Datasheet

Current PartRFQ

RKS5K0E

OhmiteIn Stock: 1032RKS5K0E Datasheet

MFR RecommendedRFQ

Key Parameters

Substitute Part Grouping Explanation

The RKS5K0E from Ohmite qualifies as a substitute based on the following critical parameters:

• Power Rating: Both parts are rated for 100W wirewound operation
• Resistive Material: Both utilize wirewound construction
• Number of Turns: Both feature 1-turn design
• Termination Style: Both employ solder lug termination
• Mounting Type: Both are panel mount configurations
• Rotation: Both support 300° rotation
• Tolerance: Both maintain ±10% tolerance

The resistance value differs (5k Ohm vs. 4.7k Ohm), representing a 6.4% variance within the ±10% tolerance band of the original part. This variance is acceptable for applications where the potentiometer functions as a general-purpose load resistor or adjustment element rather than a precision reference.

Parameter Comparison

Engineering Selection Recommendations

The RKS5K0E serves as the primary substitute for the obsolete RT100AS4701KB. Selection is justified on the following basis:

• The substitute maintains identical power handling (100W) and wirewound construction, ensuring thermal and electrical performance equivalence in high-power applications
• Active product status ensures ongoing availability and supply chain continuity
• ROHS3 compliance of the RKS5K0E aligns with modern regulatory requirements, whereas the original part's compliance status is not specified
• The 6.4% resistance variance falls within the ±10% tolerance specification of both components, making it suitable for applications where absolute resistance matching is not critical

Physical differences in actuator geometry (round vs. flatted, 25mm vs. 22.23mm length) require mechanical fit verification in panel mount installations. Bushing thread specification (3/8-32) for the substitute must be confirmed compatible with existing panel cutouts and mounting hardware.

Frequently Asked Questions (FAQ)

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

A: The RKS5K0E provides 5k Ohm resistance compared to the 4.7k Ohm original. This 6.4% difference is within the ±10% tolerance band specified for both components. For applications where the potentiometer functions as a load resistor or general adjustment element, this variance is acceptable. Applications requiring precise resistance matching should evaluate circuit-level impact.

Q: Are the physical dimensions compatible?

A: Both parts are panel mount wirewound potentiometers with 300° rotation and solder lug termination. However, actuator length differs (25mm vs. 22.23mm) and actuator type differs (round vs. flatted). Panel cutout and mounting hardware compatibility must be verified before substitution.

Q: What is the significance of the linear taper specification on the substitute?

A: The RKS5K0E is specified with linear taper, while the original part does not specify taper. Linear taper indicates proportional resistance change across the rotation range. This specification difference should be evaluated against application requirements for resistance distribution.

Q: Does the ROHS3 compliance of the substitute affect compatibility?

A: ROHS3 compliance of the RKS5K0E indicates adherence to current environmental and hazardous substance restrictions. This is advantageous for new designs and applications subject to regulatory compliance requirements. The original part's compliance status is not documented.

Q: Can the substitute be used in existing designs without modification?

A: Electrical substitution is feasible based on power rating, construction type, and tolerance alignment. Mechanical substitution requires verification of panel mount geometry, bushing thread compatibility (3/8-32 for substitute), and actuator fit within existing mechanical assemblies.