RT500AS1000KB Equivalent & Substitute Parts

Part Overview

The RT500AS1000KB is a 100 Ohm wirewound potentiometer manufactured by Vishay Sfernice, rated for 500W power dissipation with linear taper and panel mount configuration. This component is classified as obsolete, making identification of functionally equivalent alternatives essential for ongoing system maintenance, repair, and redesign applications. Substitute parts must maintain electrical performance across resistance, power rating, and mechanical interface specifications to ensure direct compatibility in existing circuit designs.

Substiute Parts

RT500AS1000KB

Vishay SferniceIn Stock: 1030RT500AS1000KB Datasheet

Current PartRFQ

RUS100E

OhmiteIn Stock: 1139RUS100E Datasheet

MFR RecommendedRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution of the RT500AS1000KB is determined by the following critical parameters:

Resistance value must remain 100 Ohms with ±10% tolerance to maintain circuit impedance specifications. Taper classification must be linear to preserve the functional relationship between mechanical rotation and electrical output. Wirewound construction is required to support the high power dissipation demands of this application. Panel mount configuration with solder termination ensures mechanical and electrical compatibility with existing mounting infrastructure.

The RUS100E from Ohmite qualifies as a substitute based on matching these core parameters: identical 100 Ohm resistance, linear taper, wirewound construction, panel mount design, and solder-based termination (solder lug variant). The RUS100E provides enhanced power rating (1000W versus 500W), which represents an upgrade path for applications requiring increased thermal headroom.

Parameter Comparison

Engineering Selection Recommendations

The RUS100E represents the primary substitute for the obsolete RT500AS1000KB. Selection is justified by product status alignment: the RUS100E maintains active manufacturing status with current availability (1051 pcs in stock), whereas the RT500AS1000KB is obsolete. Both components meet identical electrical specifications for resistance, tolerance, and taper characteristics.

The RUS100E provides superior power handling capability at 1000W, doubling the thermal capacity of the original RT500AS1000KB. This enhancement eliminates thermal margin constraints in applications operating near the 500W limit. The RUS100E is RoHS3 compliant, meeting current environmental and regulatory standards for new designs and system upgrades.

Mechanical differences exist in actuator geometry (flatted versus round) and body diameter (304.80mm versus 143.00mm). These dimensional variations require mechanical integration assessment within the specific mounting enclosure. Termination style transition from solder turret to solder lug necessitates PCB pad geometry verification to ensure electrical connection integrity.

Frequently Asked Questions (FAQ)

Q: Can the RUS100E directly replace the RT500AS1000KB without circuit modification?

A: Electrical substitution is valid based on matching resistance, tolerance, taper, and wirewound construction. Mechanical integration requires verification of panel cutout dimensions, actuator clearance, and termination pad compatibility. No circuit-level modifications are required if mechanical constraints are satisfied.

Q: What is the significance of the power rating difference between 500W and 1000W?

A: The RUS100E's 1000W rating provides doubled thermal capacity. In applications where the RT500AS1000KB operated at or near 500W dissipation, the RUS100E offers improved thermal margin and extended component lifespan. Applications operating below 500W experience no functional change.

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

A: The RT500AS1000KB uses solder turret termination while the RUS100E uses solder lug termination. Both are solder-based connections suitable for PCB assembly. PCB pad geometry and hole sizing must be verified to accommodate the specific lug configuration of the RUS100E.

Q: Does the rotation angle difference (300° versus 335°) affect circuit operation?

A: Rotation angle defines the mechanical range of the potentiometer shaft. The 35° difference represents approximately 12% additional mechanical travel on the RUS100E. This affects the resolution of adjustment but does not alter electrical performance if the application does not require the full mechanical range of either component.

Q: Is the RUS100E suitable for new designs or only as a replacement for obsolete systems?

A: The RUS100E is actively manufactured and RoHS3 compliant, making it appropriate for both new designs and legacy system replacements. Its active product status and enhanced specifications support long-term supply chain reliability for new applications.