Ohmite F55J2K5 Equivalent & Substitute Parts

Part Overview

The Ohmite F55J2K5 is a 2.5 kOhms ±5% 55W wirewound chassis mount resistor from the Stackohm® 250 series. This component is classified as Active product status and is designed for high-power applications requiring stable resistance values across extended temperature ranges. Substitute parts are identified to address inventory availability, packaging preferences, and compliance requirements while maintaining electrical and mechanical compatibility.

Substiute Parts

F55J2K5

OhmiteIn Stock: 1124F55J2K5 Datasheet

Current PartRFQ

F30J2K5E

OhmiteIn Stock: 760F30J2K5E Datasheet

Parametric EquivalentRFQ

F55J2K5E

OhmiteIn Stock: 993F55J2K5E Datasheet

Parametric EquivalentRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitute parts for the F55J2K5 are identified based on the following critical parameters that determine functional equivalence:

• Resistance value: 2.5 kOhms
• Tolerance: ±5%
• Composition: Wirewound
• Temperature Coefficient: ±260ppm/°C
• Operating Temperature Range: -55°C ~ 350°C
• Coating/Housing Type: Vitreous Enamel Coated
• Mounting Feature: Flange Braces, Right Angle
• Lead Style: Solder Lugs
• Package/Case: Radial, Flat Oval

The F55J2K5E is a direct equivalent with identical electrical and mechanical specifications, differing only in packaging format (Bulk vs. standard packaging). The F30J2K5E maintains all electrical parameters and mechanical mounting characteristics but operates at a reduced power rating of 30W, resulting in a smaller physical footprint (1.250" L vs. 4.600" L).

Parameter Comparison

Engineering Selection Recommendations

F55J2K5E is the primary substitute for F55J2K5. Both parts maintain identical electrical specifications (2.5 kOhms ±5%, 55W) and mechanical dimensions. The F55J2K5E offers improved compliance status (ROHS3 Compliant vs. RoHS non-compliant) and defined moisture sensitivity rating (MSL 1 vs. Not Applicable), making it suitable for applications with regulatory requirements.

F30J2K5E serves as a substitute only when power dissipation requirements do not exceed 30W. This part maintains all electrical parameters and mounting characteristics but features a reduced physical footprint (1.250" L vs. 4.600" L). The F30J2K5E is ROHS3 Compliant with MSL 1 rating. Selection of this part requires confirmation that the 30W power rating is sufficient for the application circuit.

All three parts share identical resistance value, tolerance, temperature coefficient, and operating temperature range, ensuring electrical performance consistency within the specified parameters.

Frequently Asked Questions (FAQ)

Q: Can F55J2K5E directly replace F55J2K5 in existing designs?

A: Yes. The F55J2K5E maintains identical electrical specifications (2.5 kOhms ±5%, 55W) and mechanical dimensions (4.600" L x 1.000" W, 0.563" height). The primary difference is packaging format and improved RoHS3 compliance status.

Q: When is F30J2K5E suitable as a substitute?

A: F30J2K5E is suitable when circuit power dissipation does not exceed 30W. This part maintains all electrical parameters (2.5 kOhms ±5%, ±260ppm/°C, -55°C ~ 350°C) and mounting characteristics but occupies a smaller footprint (1.250" L vs. 4.600" L). PCB layout space constraints may favor this option.

Q: What are the compliance differences between these parts?

A: F55J2K5 is RoHS non-compliant with Not Applicable MSL rating. Both F55J2K5E and F30J2K5E are ROHS3 Compliant with MSL 1 (Unlimited) rating, meeting modern regulatory requirements for restricted substances and moisture handling.

Q: Are the mounting features identical across all three parts?

A: Yes. All three parts feature Flange Braces with Right Angle mounting, Solder Lugs lead style, and Radial Flat Oval package configuration. Height when seated is 0.563" (14.29mm) for all variants.

Q: What is the temperature stability across the operating range?

A: All three parts maintain a Temperature Coefficient of ±260ppm/°C across the operating range of -55°C to 350°C, ensuring consistent resistance value stability in high-temperature applications.