RT500AS2R20KB Equivalent & Substitute Parts

Part Overview

The RT500AS2R20KB is a 2.2 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

RT500AS2R20KB

Vishay SferniceIn Stock: 1130RT500AS2R20KB Datasheet

Current PartRFQ

RRS2R0E

OhmiteIn Stock: 1116RRS2R0E Datasheet

MFR RecommendedRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution of the RT500AS2R20KB is determined by the following critical parameters:

• Resistance Value: Substitute parts must operate within the tolerance band of the original specification. The RT500AS2R20KB operates at 2.2 Ohms ±10%, establishing a functional range of 1.98 to 2.42 Ohms.
• Power Dissipation: The 500W power rating is a mandatory requirement for thermal and electrical safety in the application circuit.
• Taper Characteristic: Linear taper ensures proportional resistance change across the adjustment range, required for control applications.
• Construction Type: Wirewound construction provides the necessary power handling and precision for this application class.
• Mounting Configuration: Panel mount with 1-turn adjustment and single-gang configuration defines the mechanical and electrical interface.
• Termination Style: Connection method must accommodate the circuit board or chassis integration requirements.

The RRS2R0E from Ohmite meets these substitution criteria with a 2 Ohm resistance value (within the tolerance band), 500W power rating, linear taper, wirewound construction, and panel mount configuration.

Parameter Comparison

Engineering Selection Recommendations

The RRS2R0E is the qualified substitute for the RT500AS2R20KB based on the following factors:

• Functional Equivalence: Both components share identical power ratings (500W), taper characteristics (linear), construction method (wirewound), and adjustment mechanism (1-turn, single-gang). The resistance values of 2.2 Ohms and 2 Ohms fall within the same tolerance band (±10%), making them functionally interchangeable in circuit applications.
• Product Status: The RRS2R0E maintains active production status, ensuring long-term availability and supply chain continuity, whereas the RT500AS2R20KB is obsolete.
• Regulatory Compliance: The RRS2R0E is ROHS3 compliant, meeting current environmental and regulatory standards for electronic component manufacturing and distribution.
• Mechanical Interface Considerations: The RRS2R0E features a flatted actuator and solder lug termination, differing from the round actuator and solder turret of the original part. These differences require mechanical and electrical interface verification during integration.

Frequently Asked Questions (FAQ)

Q: Can the RRS2R0E directly replace the RT500AS2R20KB without circuit modification?

A: The RRS2R0E is functionally equivalent in electrical performance (500W power rating, linear taper, wirewound construction, 1-turn adjustment). However, the termination style differs (solder lug versus solder turret) and the actuator geometry is different (flatted versus round). Mechanical mounting and electrical connection points must be verified for compatibility with the existing circuit board or chassis design.

Q: What is the resistance tolerance band for substitution?

A: Both the RT500AS2R20KB (2.2 Ohms ±10%) and RRS2R0E (2 Ohms ±10%) operate within overlapping tolerance ranges. The RT500AS2R20KB functional range is 1.98 to 2.42 Ohms, and the RRS2R0E functional range is 1.8 to 2.2 Ohms. The overlap ensures electrical compatibility within the application's design specifications.

Q: Are there packaging or inventory considerations?

A: The RT500AS2R20KB is listed as obsolete with 1110 pieces in stock. The RRS2R0E is an active product with 1098 pieces available in bulk packaging. For new designs or long-term production, the RRS2R0E is the recommended selection due to its active status and ongoing availability.

Q: What are the key mechanical differences?

A: The RT500AS2R20KB features a round actuator (0.394" diameter) with solder turret termination and a 5.630" diameter body. The RRS2R0E has a flatted actuator (0.375" diameter) with solder lug termination and an 8.000" diameter body. These differences affect mounting footprint and panel cutout requirements.

Q: Is the RRS2R0E suitable for high-temperature applications?

A: Both components are specified for 500W power dissipation. Temperature coefficient information is not provided in the technical specifications for either part. Thermal performance under operating conditions must be evaluated based on the specific application environment and duty cycle.