RT500AS3350KB Equivalent & Substitute Parts

Part Overview

The RT500AS3350KB is a 335 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, repair, and new design implementations where this specification remains required.

Substiute Parts

RT500AS3350KB

Vishay SferniceIn Stock: 756RT500AS3350KB Datasheet

Current PartRFQ

RRS325E

OhmiteIn Stock: 868RRS325E Datasheet

MFR RecommendedRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution of the RT500AS3350KB is determined by the following critical parameters:

• Resistance value within tolerance band (±10%)
• Power dissipation capability (500W minimum)
• Linear taper characteristic
• Single-turn, single-gang configuration
• Wirewound construction
• Panel mount form factor
• Solder termination compatibility

The RRS325E from Ohmite qualifies as a manufacturer-recommended substitute. While the resistance value differs by 10 Ohm (325 Ohm vs. 335 Ohm), this falls within the ±10% tolerance specification of the original part, making it functionally equivalent for circuit applications. Both components maintain identical power ratings, taper characteristics, and mounting configurations.

Parameter Comparison

Engineering Selection Recommendations

The RRS325E serves as the manufacturer-recommended substitute for the obsolete RT500AS3350KB. Selection of this alternative is supported by:

• Active product status ensuring continued availability and supply chain reliability
• ROHS3 compliance meeting current environmental and regulatory standards
• Electrical equivalence within specified tolerance parameters
• Identical power dissipation and functional characteristics

Physical differences exist in actuator geometry and body diameter. The RRS325E features a larger body diameter (8.000" vs. 5.630") and flatted actuator design compared to the round actuator of the original part. These mechanical variations require verification against mechanical envelope constraints and panel cutout specifications in the target application. Termination style differs (solder lug vs. solder turret), necessitating circuit board layout compatibility assessment.

Frequently Asked Questions (FAQ)

Q: Can the RRS325E directly replace the RT500AS3350KB in all applications?

A: Electrical substitution is valid within the ±10% tolerance specification. Mechanical compatibility must be confirmed, as the RRS325E has a larger body diameter and different actuator geometry. Panel mounting hole patterns and actuator clearances require verification.

Q: What is the resistance tolerance impact of using 325 Ohm instead of 335 Ohm?

A: The 10 Ohm difference represents a 2.99% deviation from the original 335 Ohm specification, well within the ±10% tolerance band of both components. This is electrically equivalent for circuit design purposes.

Q: Are there compatibility concerns with the different termination styles?

A: Yes. The RT500AS3350KB uses solder turret termination while the RRS325E uses solder lug termination. Circuit board pad design and soldering process parameters may differ. Verify that the target PCB layout accommodates solder lug connection geometry.

Q: Does the RRS325E meet current regulatory requirements?

A: The RRS325E is ROHS3 compliant, meeting current environmental regulations. The original RT500AS3350KB status does not specify RoHS compliance, making the substitute advantageous for new designs or systems requiring regulatory compliance documentation.

Q: What mechanical considerations apply to the larger body diameter of the RRS325E?

A: The RRS325E body diameter is 8.000" compared to 5.630" for the original part. Panel cutout dimensions and surrounding component clearances must accommodate this larger form factor. Actuator length and diameter also differ slightly, affecting knob compatibility and control panel integration.