RT500AS3300KB Equivalent & Substitute Parts

Part Overview

The RT500AS3300KB is a 330 Ohm wirewound potentiometer rated for 500W continuous power dissipation, designed for panel mount applications with linear taper and 1-turn adjustment. This component is classified as obsolete, making identification of functionally equivalent alternatives essential for ongoing system maintenance and new design implementations where this specification remains applicable.

Substiute Parts

RT500AS3300KB

Vishay SferniceIn Stock: 922RT500AS3300KB Datasheet

Current PartRFQ

RRS325E

OhmiteIn Stock: 868RRS325E Datasheet

MFR RecommendedRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution of the RT500AS3300KB is determined by the following critical parameters:

• Power Rating: 500W minimum requirement for thermal performance equivalence
• Resistance Value: 330 Ohms nominal with ±10% tolerance band (297–363 Ohms acceptable range)
• Taper Characteristic: Linear response for proportional adjustment
• Mounting Configuration: Panel mount with single-gang, single-turn design
• Resistive Technology: Wirewound construction for high-power dissipation capability

The substitute part RRS325E meets these core criteria with a 325 Ohm resistance value that falls within the tolerance band of the original specification, maintains 500W power rating, preserves linear taper and single-turn configuration, and supports panel mount installation.

Parameter Comparison

Engineering Selection Recommendations

The RRS325E represents a functionally equivalent substitute for the obsolete RT500AS3300KB based on the following factors:

• Electrical Equivalence: The 325 Ohm resistance value of the RRS325E falls within the ±10% tolerance specification of the original 330 Ohm design, ensuring functional compatibility in circuit applications where this resistance range is acceptable.

• Power Dissipation: Both components maintain identical 500W power ratings, preserving thermal performance characteristics in high-power applications.

• Active Production Status: The RRS325E is classified as active product status, ensuring long-term availability and supply chain reliability compared to the obsolete RT500AS3300KB.

• Compliance: The RRS325E carries RoHS3 compliance certification, meeting current environmental and regulatory standards for component procurement.

• Mechanical Interface: Both components feature panel mount configuration with identical single-turn, linear-taper design, supporting direct functional replacement in existing mechanical assemblies.

• Termination Consideration: The RRS325E uses solder lug termination versus the solder turret of the original part. Circuit board layout and connection methodology must accommodate this termination style difference.

Frequently Asked Questions (FAQ)

Q: Can the RRS325E directly replace the RT500AS3300KB in all applications?

A: The RRS325E provides electrical and mechanical equivalence for applications where 325 Ohms falls within the acceptable resistance tolerance band. The primary consideration is termination style: the RRS325E uses solder lug connections rather than solder turret, requiring verification of circuit board pad configuration and connection methodology.

Q: What is the resistance tolerance band for the RT500AS3300KB?

A: With ±10% tolerance on the 330 Ohm nominal value, the acceptable resistance range is 297–363 Ohms. The RRS325E at 325 Ohms operates within this band.

Q: Are there differences in mechanical dimensions between these components?

A: Yes. The RT500AS3300KB has a body diameter of 5.630 inches (143.00mm) with 300° rotation, while the RRS325E has a body diameter of 8.000 inches (203.20mm) with 325° rotation. Panel cutout dimensions and mounting hole spacing must be verified for mechanical compatibility.

Q: What is the significance of the different rotation angles?

A: The RT500AS3300KB provides 300° of rotation while the RRS325E provides 325°. This represents a minor variation in adjustment range and does not affect functional equivalence for applications where the full rotation range is not critical to operation.

Q: Does the RRS325E meet current regulatory requirements?

A: Yes. The RRS325E is RoHS3 compliant and carries EAR99 export classification, meeting current environmental and regulatory standards for component procurement and use.