RT500AS4R70KB Equivalent & Substitute Parts

Part Overview

The RT500AS4R70KB is a 4.7 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, making identification of functionally equivalent alternatives essential for ongoing system maintenance and new design implementations where similar performance characteristics are required.

Substiute Parts

RT500AS4R70KB

Vishay SferniceIn Stock: 811RT500AS4R70KB Datasheet

Current PartRFQ

RRS5R0E

OhmiteIn Stock: 833RRS5R0E Datasheet

MFR RecommendedRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution of the RT500AS4R70KB is based on the following critical parameters that define functional equivalence:

• Power Rating: 500W minimum requirement for thermal performance
• Resistive Material: Wirewound construction for high-power dissipation capability
• Taper Type: Linear response for proportional adjustment
• Mounting Configuration: Panel mount with single-gang, single-turn design
• Resistance Value: Nominal resistance within tolerance band (±10%)
• Termination Compatibility: Solder-based connection methods

The substitute part RRS5R0E from Ohmite meets these core functional requirements with a 5 Ohm resistance value, which falls within the acceptable tolerance range for applications requiring 4.7 Ohm nominal performance in high-power wirewound potentiometer circuits.

Parameter Comparison

Engineering Selection Recommendations

The RRS5R0E represents the primary substitute for the obsolete RT500AS4R70KB based on the following factors:

• Product Status: The RRS5R0E maintains active production status, ensuring availability for replacement and new applications
• Compliance: RRS5R0E is ROHS3 compliant, meeting current environmental and regulatory standards
• Functional Equivalence: Both components share identical power ratings, resistive material composition, taper characteristics, and mounting methodology
• Resistance Differential: The 0.3 Ohm variance (4.7 to 5 Ohms) remains within the ±10% tolerance specification, maintaining circuit performance within design parameters
• Termination Adaptation: While termination styles differ (solder turret versus solder lug), both methods provide equivalent electrical connection reliability for panel mount applications

Frequently Asked Questions (FAQ)

Q: Can the RRS5R0E directly replace the RT500AS4R70KB without circuit modification?

A: The RRS5R0E functions as an electrical equivalent within the specified tolerance band. The 0.3 Ohm resistance difference (4.7 to 5 Ohms) falls within the ±10% tolerance, maintaining circuit performance. Physical mounting and termination style differences require mechanical adaptation during installation.

Q: What is the significance of the resistance tolerance in substitution?

A: Both components specify ±10% tolerance, meaning the RT500AS4R70KB operates between 4.23 and 5.17 Ohms, while the RRS5R0E operates between 4.5 and 5.5 Ohms. The overlap in these ranges confirms functional compatibility for applications designed around the nominal 4.7 Ohm specification.

Q: How do the termination style differences affect installation?

A: The RT500AS4R70KB uses solder turret termination, while the RRS5R0E uses solder lug termination. Both are solder-based connection methods suitable for panel mount potentiometers. Installation requires verification that the circuit board or connection interface accommodates the specific lug configuration of the substitute part.

Q: Why is the RRS5R0E recommended despite the resistance value difference?

A: The RRS5R0E is the manufacturer-recommended substitute from Ohmite, maintains active production status, and meets all critical functional parameters including power rating, material composition, and taper type. The 0.3 Ohm variance remains within acceptable tolerance for high-power wirewound potentiometer applications.

Q: What compliance advantages does the RRS5R0E offer?

A: The RRS5R0E is ROHS3 compliant, meeting current environmental regulations. The obsolete RT500AS4R70KB does not carry current compliance certifications, making the RRS5R0E the appropriate choice for new designs and systems requiring regulatory compliance documentation.