Honeywell 58C220K Wirewound Potentiometer - Equivalent & Substitute Parts

Part Overview

The Honeywell 58C220K is a 20k Ohm, 4W wirewound linear potentiometer designed for panel mount applications with a 1-turn rotation of 300°. This component features a slotted actuator, solder lug termination, and is classified as obsolete. Due to its obsolete product status, identifying equivalent substitute parts is essential for ongoing system maintenance, repair, and new design implementations where this specification remains functionally required.

Substiute Parts

58C220K

Honeywell Sensing and Productivity SolutionsIn Stock: 78358C220K Datasheet

Current PartRFQ

RHL20KE

OhmiteIn Stock: 747RHL20KE Datasheet

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Key Parameters

Substitute Part Grouping Explanation

Substitute parts for the Honeywell 58C220K must satisfy the following mandatory electrical and mechanical criteria:

Electrical Requirements:

• Resistance value: 20k Ohm (exact match)
• Taper: Linear (exact match)
• Resistive material: Wirewound (exact match)
• Number of turns: 1 (exact match)
• Termination style: Solder Lug (exact match)

Mechanical Requirements:

• Rotation: 300° (exact match)
• Mounting type: Panel Mount (exact match)
• Bushing thread: 3/8-32 (exact match)
• Actuator type: Slotted (exact match)

Power Rating Consideration: Substitute parts must have a power rating equal to or greater than 4W. Higher power ratings are acceptable as they provide additional thermal margin and operational headroom.

Tolerance Consideration: Tolerance specifications may vary between original and substitute parts. The original part specifies ±5% tolerance. Substitute parts with equal or tighter tolerance specifications are acceptable.

The Ohmite RHL20KE meets all mandatory electrical and mechanical criteria and qualifies as a direct substitute.

Parameter Comparison

Engineering Selection Recommendations

The Ohmite RHL20KE qualifies as a direct electrical and mechanical substitute for the Honeywell 58C220K based on the following factors:

Compliance and Availability: The RHL20KE maintains active product status, ensuring long-term availability and supply chain continuity. Both parts are RoHS compliant, with the RHL20KE meeting ROHS3 specifications, indicating current regulatory alignment.

Electrical Compatibility: All critical electrical parameters match exactly: 20k Ohm resistance, linear taper, wirewound construction, and 1-turn configuration. The RHL20KE's 25W power rating exceeds the original 4W specification, providing additional thermal capacity and operational margin without introducing functional incompatibility.

Mechanical Compatibility: Panel mount configuration, 3/8-32 bushing thread, 300° rotation, and slotted actuator specifications are identical. Physical dimensions differ slightly (body diameter: 42.93mm vs. 39.62mm), but this does not affect functional compatibility in standard panel mount applications.

Tolerance Consideration: The RHL20KE specifies ±10% tolerance compared to the original ±5%. In applications where tighter tolerance is required, this difference must be evaluated against specific circuit requirements. For general-purpose potentiometer applications, ±10% tolerance is within acceptable engineering practice.

Frequently Asked Questions (FAQ)

Q: Can the Ohmite RHL20KE directly replace the Honeywell 58C220K in existing applications?

A: Yes. The RHL20KE matches all critical electrical and mechanical parameters: 20k Ohm resistance, linear taper, wirewound construction, 1-turn rotation, 300° mechanical range, solder lug termination, and 3/8-32 panel mount bushing thread. Physical dimensions vary slightly, but this does not affect standard panel mount installations.

Q: Why does the RHL20KE have a higher power rating (25W vs. 4W)?

A: Higher power ratings indicate greater thermal capacity and operational headroom. A 25W potentiometer can safely dissipate more power than a 4W unit without exceeding temperature limits. This does not create incompatibility; the substitute simply provides additional margin. Applications requiring exactly 4W dissipation will function identically with the 25W unit.

Q: Does the ±10% tolerance of the RHL20KE affect compatibility?

A: Tolerance differences must be evaluated based on circuit requirements. The original 58C220K specifies ±5% tolerance, while the RHL20KE specifies ±10%. For applications where resistance value precision is critical, this difference requires circuit-level analysis. For general potentiometer applications, ±10% tolerance is standard engineering practice.

Q: Are both parts RoHS compliant?

A: Yes. The Honeywell 58C220K is RoHS Compliant. The Ohmite RHL20KE is ROHS3 Compliant, indicating compliance with current regulatory standards. Both parts meet environmental and hazardous substance restrictions.

Q: What is the significance of the Honeywell 58C220K being obsolete?

A: Obsolete status indicates the part is no longer manufactured by Honeywell. Existing inventory may be available through authorized distributors, but long-term supply cannot be guaranteed. The Ohmite RHL20KE, with active product status, provides a sustainable alternative for new designs and ongoing maintenance requirements.

Q: Are the physical dimensions compatible with existing panel cutouts?

A: The bushing thread specification (3/8-32) is identical, ensuring mechanical fit. The body diameter differs slightly (42.93mm vs. 39.62mm), but this does not affect panel mount compatibility. Standard panel cutouts accommodate both dimensions without modification.

Q: Can I use the RHL20KE in high-temperature applications?

A: Temperature coefficient information is not provided for either part in the available specifications. Thermal performance must be evaluated based on power dissipation requirements and ambient operating conditions. The RHL20KE's higher power rating provides additional thermal margin in standard operating environments.