RT100ASF3300KB Equivalent & Substitute Parts

Part Overview

The RT100ASF3300KB is a 330 Ohm, 100W wirewound potentiometer manufactured by Vishay Sfernice, designed for panel mount applications with a 1-turn rotation and solder lug termination. This component is classified as obsolete, making identification of suitable substitute parts essential for ongoing system maintenance and new design implementations where equivalent functionality is required.

Substiute Parts

RT100ASF3300KB

Vishay SferniceIn Stock: 1157RT100ASF3300KB Datasheet

Current PartRFQ

RLS350E

OhmiteIn Stock: 766RLS350E Datasheet

MFR RecommendedRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution of the RT100ASF3300KB is determined by the following critical parameters:

• Resistance Value: Substitute parts must accommodate the 330 Ohm specification within the ±10% tolerance band
• Power Rating: Minimum 100W capability required for thermal performance equivalence
• Wirewound Construction: Resistive material type must remain wirewound for electrical characteristics
• Panel Mount Configuration: Physical mounting interface must support panel mount installation
• Solder Lug Termination: Connection method must utilize solder lug for circuit integration
• Single-Turn Rotation: 1-turn potentiometer specification for control range consistency
• Tolerance: ±10% tolerance maintained across substitute selection

The RLS350E from Ohmite meets these substitution criteria with allowable parameter variations within engineering tolerances.

Parameter Comparison

Engineering Selection Recommendations

The RLS350E serves as the manufacturer-recommended substitute for the RT100ASF3300KB. Selection of this substitute is supported by the following factors:

• Active Product Status: The RLS350E maintains active production status, ensuring long-term availability and supply chain continuity
• Enhanced Power Rating: The 150W power rating provides thermal margin above the original 100W specification, improving reliability in high-dissipation applications
• Resistance Compatibility: The 350 Ohm value falls within acceptable operating parameters for circuits designed around the 330 Ohm specification, with the 6% difference accommodated by standard ±10% tolerance
• Regulatory Compliance: ROHS3 compliance certification meets current environmental and regulatory requirements for component procurement
• Mechanical Equivalence: Identical rotation angle, single-turn configuration, and panel mount interface ensure direct physical and functional replacement

Frequently Asked Questions (FAQ)

Q: Can the RLS350E directly replace the RT100ASF3300KB in existing circuits?

A: Yes. The RLS350E provides functional equivalence through matching wirewound construction, single-turn rotation, panel mount configuration, and solder lug termination. The 350 Ohm resistance value differs by 6% from the original 330 Ohm specification, which is within the ±10% tolerance band of both components.

Q: What is the significance of the power rating difference between 100W and 150W?

A: The RLS350E's 150W rating exceeds the original 100W specification, providing additional thermal headroom. This enhancement improves component reliability and longevity in applications operating near maximum power dissipation limits.

Q: Are there mechanical compatibility concerns with the RLS350E?

A: The RLS350E features a flatted actuator type compared to the round actuator of the RT100ASF3300KB. Both components maintain identical 300° rotation and panel mount interface. Mechanical compatibility depends on the specific actuator engagement design in the application. The RLS350E body diameter is 4.000" (101.60mm), which should be verified against available panel cutout dimensions.

Q: Does the RLS350E meet current regulatory requirements?

A: Yes. The RLS350E carries ROHS3 compliance certification, meeting current environmental and regulatory standards for component procurement and system integration.

Q: What is the tolerance specification for both components?

A: Both the RT100ASF3300KB and RLS350E maintain ±10% tolerance on resistance values, ensuring consistent performance characteristics across the substitution.