F40J2K0 Equivalent & Substitute Parts

Part Overview

The F40J2K0 is a 2 kOhms ±5% 40W wirewound chassis mount resistor manufactured by Ohmite, part of 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 1,068 units in stock. Substitute parts are necessary when addressing RoHS compliance requirements, managing inventory constraints, or accommodating specific procurement specifications while maintaining identical electrical and mechanical performance.

Substiute Parts

F40J2K0

OhmiteIn Stock: 1133F40J2K0 Datasheet

Current PartRFQ

F40J2K0E

OhmiteIn Stock: 740F40J2K0E Datasheet

Parametric EquivalentRFQ

Key Parameters

Substitute Part Grouping Explanation

The F40J2K0E qualifies as a parametric equivalent substitute based on strict alignment with all critical electrical and mechanical parameters. Substitution eligibility is determined by the following criteria:

• Identical resistance value: 2 kOhms
• Matching tolerance specification: ±5%
• Equivalent power rating: 40W
• Same composition type: Wirewound
• Identical temperature coefficient: ±260ppm/°C
• Matching operating temperature range: -55°C to 350°C
• Same coating and housing type: Vitreous Enamel Coated
• Identical mounting configuration: Flange Braces, Right Angle
• Matching physical dimensions: 2.000" L × 1.000" W (50.80mm × 25.40mm)
• Same lead style: Solder Lugs
• Identical package configuration: Radial, Flat Oval

The F40J2K0E maintains full functional and mechanical interchangeability with the F40J2K0 while offering improved compliance status.

Parameter Comparison

Engineering Selection Recommendations

Both the F40J2K0 and F40J2K0E are active production components suitable for 2 kOhms 40W wirewound chassis mount applications. Selection between these parts should be based on compliance requirements and procurement specifications:

The F40J2K0E is the appropriate selection for applications requiring RoHS compliance. This part carries RoHS Compliant certification and MSL 1 (Unlimited) rating, making it suitable for standard manufacturing and storage environments without moisture sensitivity constraints.

The F40J2K0 remains available for applications where RoHS compliance is not a requirement or where legacy design specifications mandate the non-compliant variant. Both parts maintain identical electrical performance, thermal characteristics, and mechanical mounting interfaces.

Frequently Asked Questions (FAQ)

Q: Can F40J2K0E be used as a direct replacement for F40J2K0 in existing designs?

A: Yes. The F40J2K0E provides complete functional and mechanical interchangeability. All electrical parameters, physical dimensions, mounting configurations, and thermal characteristics are identical. The primary difference is RoHS compliance status.

Q: What is the significance of the RoHS compliance difference?

A: RoHS compliance indicates adherence to the Restriction of Hazardous Substances directive. The F40J2K0E meets these restrictions, while the F40J2K0 does not. Selection depends on your application's regulatory requirements and end-market specifications.

Q: Are the physical dimensions and mounting interfaces identical?

A: Yes. Both parts share identical dimensions (2.000" L × 1.000" W, 50.80mm × 25.40mm), height (0.563" / 14.29mm), flange brace mounting configuration, and solder lug lead style. No PCB layout or mechanical assembly modifications are required for substitution.

Q: What does MSL 1 (Unlimited) mean for the F40J2K0E?

A: MSL 1 indicates the lowest moisture sensitivity level. This part can be stored and handled under standard conditions without special moisture control measures or floor life restrictions.

Q: Are there any performance differences in temperature coefficient or operating range?

A: No. Both parts maintain identical temperature coefficient (±260ppm/°C) and operating temperature range (-55°C to 350°C). Thermal performance and stability are equivalent.

Q: Which part should I specify for new designs?

A: For new designs, specify F40J2K0E to ensure RoHS compliance and future regulatory alignment. Both parts are active in production with adequate inventory availability.