Ohmite F55J2K0 Equivalent & Substitute Parts

Part Overview

The Ohmite F55J2K0 is a 2 kOhms ±5% 55W wirewound chassis mount resistor from the Stackohm® 250 series. This component is designed for high-power applications requiring reliable thermal dissipation and mechanical stability through flange-braced mounting. The part is currently active in production with 930 units in stock. Substitute parts are identified when equivalent electrical specifications and mechanical compatibility allow direct replacement in circuit designs.

Substiute Parts

F55J2K0

OhmiteIn Stock: 948F55J2K0 Datasheet

Current PartRFQ

F55J2K0E

OhmiteIn Stock: 1080F55J2K0E Datasheet

Parametric EquivalentRFQ

F40J2K0E

OhmiteIn Stock: 740F40J2K0E Datasheet

Parametric EquivalentRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitute parts for the F55J2K0 are identified based on the following critical parameters:

• Resistance Value: 2 kOhms (exact match required)
• Tolerance: ±5% (exact match required)
• Composition: Wirewound (exact match required)
• Temperature Coefficient: ±260ppm/°C (exact match required)
• Operating Temperature Range: -55°C ~ 350°C (exact match required)
• Coating/Housing Type: Vitreous Enamel Coated (exact match required)
• Mounting Feature: Flange Braces, Right Angle (exact match required)
• Lead Style: Solder Lugs (exact match required)
• Package/Case: Radial, Flat Oval (exact match required)

Substitutes are grouped into two categories: full electrical and mechanical equivalents (F55J2K0E) and parametric equivalents with reduced power rating (F40J2K0E). The F55J2K0E maintains identical specifications with packaging variation. The F40J2K0E provides equivalent electrical characteristics and mechanical compatibility but operates at 40W instead of 55W, resulting in dimensional reduction.

Parameter Comparison

Engineering Selection Recommendations

F55J2K0E is a direct substitute for F55J2K0 with identical electrical and mechanical specifications. The primary difference is packaging format (bulk versus standard) and improved RoHS3 compliance status. This part is suitable for applications requiring full 55W power dissipation capacity and modern regulatory compliance.

F40J2K0E is a parametric equivalent suitable only for applications where the 40W power rating is sufficient. This part maintains all electrical characteristics and mounting compatibility but features reduced physical dimensions (2.000" length versus 4.600"). Selection of F40J2K0E requires confirmation that circuit power dissipation requirements do not exceed 40W. RoHS compliance status is confirmed for this variant.

Frequently Asked Questions (FAQ)

Q: Can F55J2K0E directly replace F55J2K0 in existing designs? A: Yes. F55J2K0E maintains identical resistance, tolerance, power rating, temperature coefficient, operating temperature range, coating type, mounting features, lead style, and package configuration. The substitution is electrically and mechanically equivalent.

Q: What is the primary difference between F55J2K0 and F55J2K0E? A: The primary difference is packaging format and RoHS compliance status. F55J2K0E is supplied in bulk packaging and meets ROHS3 compliance requirements, while F55J2K0 is RoHS non-compliant.

Q: When is F40J2K0E an acceptable substitute? A: F40J2K0E is acceptable only when circuit design power dissipation does not exceed 40W. All electrical parameters (resistance, tolerance, temperature coefficient, operating temperature range) remain equivalent. Physical dimensions are reduced due to lower power rating.

Q: Are there mounting compatibility concerns with F40J2K0E? A: No. F40J2K0E maintains identical mounting features (flange braces, right angle), lead style (solder lugs), and package configuration (radial, flat oval). The reduced physical length (2.000" versus 4.600") does not affect mounting compatibility.

Q: What compliance certifications apply to each part? A: F55J2K0 is RoHS non-compliant. F55J2K0E meets ROHS3 compliance. F40J2K0E is RoHS compliant. All parts are REACH unaffected and classified as EAR99 for export control purposes.