RT100AS2900KB Equivalent & Substitute Parts

Part Overview

The RT100AS2900KB is a 290 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 functionally equivalent alternatives essential for ongoing system maintenance, repair, and new design implementations where this specification remains applicable.

Substiute Parts

RT100AS2900KB

Vishay SferniceIn Stock: 849RT100AS2900KB Datasheet

Current PartRFQ

RKS300E

OhmiteIn Stock: 864RKS300E Datasheet

MFR RecommendedRFQ

Key Parameters

Substitute Part Grouping Explanation

The RKS300E from Ohmite qualifies as a manufacturer-recommended substitute based on the following critical parameters:

• Power Rating Match: Both components are rated for 100W continuous operation, ensuring equivalent thermal and electrical performance in the application circuit.
• Resistive Material: Both utilize wirewound construction, providing identical frequency response characteristics and load-handling behavior.
• Termination Compatibility: Both feature solder lug termination, allowing direct PCB or chassis integration without adapter requirements.
• Mounting Configuration: Both are panel mount potentiometers with 300° rotation, maintaining mechanical compatibility with existing enclosure designs.
• Tolerance Specification: Both maintain ±10% resistance tolerance, ensuring equivalent circuit performance and calibration requirements.
• Single-Turn Adjustment: Both provide 1-turn operation, preserving the adjustment resolution and control feel of the original design.

The RKS300E resistance value of 300 Ohms represents a 3.4% deviation from the 290 Ohm specification, which falls within the ±10% tolerance band of both components and is acceptable for most potentiometer applications where exact resistance matching is not critical to circuit function.

Parameter Comparison

Engineering Selection Recommendations

The RKS300E is the appropriate substitute for the obsolete RT100AS2900KB based on the following factors:

• Product Status: The RT100AS2900KB is obsolete and no longer manufactured. The RKS300E maintains active production status, ensuring long-term availability and supply chain continuity.
• Regulatory Compliance: The RKS300E is ROHS3 compliant, meeting current environmental and hazardous substance restrictions applicable to electronic components in most markets.
• Electrical Equivalence: The 300 Ohm resistance of the RKS300E falls within the combined tolerance bands of both components (290 Ohm ±10% = 261–319 Ohms; 300 Ohm ±10% = 270–330 Ohms), providing functional equivalence in potentiometer divider and load applications.
• Mechanical Compatibility: Identical mounting, termination, and actuator interface specifications ensure direct replacement without mechanical redesign or adapter components.

Frequently Asked Questions (FAQ)

Q: Can the RKS300E directly replace the RT100AS2900KB without circuit modification?

A: Yes. Both components share identical power ratings, termination styles, mounting configurations, and rotation specifications. The 10 Ohm resistance difference (290 vs. 300 Ohms) is within the ±10% tolerance specification of both parts and does not require circuit recalibration in standard potentiometer applications.

Q: What is the significance of the resistance tolerance overlap?

A: The RT100AS2900KB tolerance range is 261–319 Ohms, and the RKS300E tolerance range is 270–330 Ohms. The overlap region (270–319 Ohms) ensures that both components can perform identically within their specified tolerances, making them functionally interchangeable for circuit design purposes.

Q: Are there mechanical differences between the actuator designs?

A: The RT100AS2900KB features a round actuator (0.984" length, 0.236" diameter), while the RKS300E features a flatted actuator (0.875" length, 0.250" diameter). These differences are cosmetic and do not affect electrical performance. Panel mount applications typically accommodate both actuator styles without modification.

Q: Does the RKS300E meet current environmental standards?

A: Yes. The RKS300E is ROHS3 compliant, meeting Restriction of Hazardous Substances Directive requirements. The RT100AS2900KB, being obsolete, does not specify RoHS compliance status.

Q: What is the packaging difference between these components?

A: The RT100AS2900KB is supplied in standard packaging (831 Pcs in stock), while the RKS300E is supplied in bulk packaging (853 Pcs in stock). Both are suitable for production assembly and repair applications.