RT500AS6R80KB Equivalent & Substitute Parts

Part Overview

The RT500AS6R80KB is a 6.8 Ohm, 500W wirewound linear potentiometer manufactured by Vishay Sfernice, designed for panel mount applications with a 1-turn adjustment mechanism and solder turret termination. This component is classified as obsolete, necessitating identification of functionally equivalent alternatives for ongoing system support and new designs requiring similar electrical and mechanical characteristics.

Substiute Parts

RT500AS6R80KB

Vishay SferniceIn Stock: 1122RT500AS6R80KB Datasheet

Current PartRFQ

RUS75RE

OhmiteIn Stock: 841RUS75RE Datasheet

MFR RecommendedRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution of the RT500AS6R80KB is determined by the following critical parameters:

• Resistance Value: The substitute must accommodate the 6.8 Ohm specification within the ±10% tolerance band
• Power Dissipation: Minimum 500W rating required for thermal equivalence
• Taper Characteristic: Linear taper mandatory for proportional adjustment response
• Mechanical Interface: Panel mount configuration with compatible actuator dimensions and termination method
• Adjustment Mechanism: Single-turn potentiometer for equivalent control resolution
• Wirewound Construction: Required for high-power dissipation and stability

The RUS75RE from Ohmite is identified as a manufacturer-recommended substitute based on functional equivalence in wirewound construction, linear taper, panel mount configuration, and single-turn adjustment capability.

Parameter Comparison

Engineering Selection Recommendations

The RUS75RE serves as the manufacturer-recommended substitute for the obsolete RT500AS6R80KB. Selection of this alternative is supported by:

• Active Product Status: The RUS75RE maintains active manufacturing status, ensuring long-term availability and supply chain continuity
• Enhanced Power Rating: The 1000W power capability exceeds the original 500W specification, providing thermal margin in high-dissipation applications
• Regulatory Compliance: ROHS3 compliance of the RUS75RE aligns with current environmental and regulatory requirements
• Functional Equivalence: Matching linear taper, single-turn configuration, wirewound construction, and panel mount interface ensure direct functional replacement
• Termination Compatibility: Transition from solder turret to solder lug termination requires verification of PCB or assembly mounting provisions

Frequently Asked Questions (FAQ)

Q: Can the RUS75RE directly replace the RT500AS6R80KB in existing designs?

A: Functional replacement is supported by matching taper, turns count, and mounting type. Termination style differs (solder lug vs. solder turret), requiring assembly method verification. Resistance value differs (75 Ohms vs. 6.8 Ohms), necessitating circuit analysis to confirm suitability for the intended application.

Q: What are the key differences between these potentiometers?

A: Primary differences include resistance value (6.8 Ohms vs. 75 Ohms), power rating (500W vs. 1000W), termination method (solder turret vs. solder lug), rotation angle (300° vs. 335°), and product status (obsolete vs. active). Both maintain linear taper, single-turn adjustment, wirewound construction, and panel mount configuration.

Q: Is the higher power rating of the RUS75RE a concern?

A: The 1000W rating of the RUS75RE provides thermal headroom and does not create compatibility issues. Applications requiring only 500W operation remain within the RUS75RE's safe operating envelope.

Q: How does the termination style change affect implementation?

A: The transition from solder turret to solder lug termination requires verification of mounting hole patterns and assembly procedures. Mechanical and electrical connection integrity must be confirmed for the specific application.

Q: Are there inventory considerations for this substitution?

A: The RUS75RE maintains active production status with current inventory availability (774 Pcs), whereas the RT500AS6R80KB is obsolete. Selection of the RUS75RE ensures sustained component availability for production and field service applications.