Equivalent & Substitute Parts for F40J3R0E

Part Overview

The F40J3R0E is a 3 Ohms ±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 maintains active product status with full RoHS3 compliance and REACH unaffected certification. Substitute parts are identified when equivalent electrical characteristics and mechanical compatibility allow direct replacement in circuit designs.

Substiute Parts

F40J3R0E

OhmiteIn Stock: 1112F40J3R0E Datasheet

Current PartRFQ

F30J3R0E

OhmiteIn Stock: 1133F30J3R0E Datasheet

Parametric EquivalentRFQ

F30J3R0

OhmiteIn Stock: 1002F30J3R0 Datasheet

Parametric EquivalentRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution eligibility for the F40J3R0E is determined by strict equivalence in the following critical parameters:

• Resistance value: 3 Ohms
• Tolerance: ±5%
• Composition: Wirewound
• Temperature Coefficient: ±400ppm/°C
• Operating Temperature Range: -55°C to 350°C
• Coating/Housing Type: Vitreous Enamel Coated
• Mounting Feature: Flange Braces, Right Angle
• Lead Style: Solder Lugs
• Package/Case: Radial, Flat Oval

The identified substitute parts maintain identical electrical and mechanical specifications with the exception of power rating. Parts with lower power ratings (30W) are classified as parametric equivalents suitable for applications where the full 40W capacity is not required. Compliance status and packaging variations are secondary considerations that do not affect core substitutability.

Parameter Comparison

Engineering Selection Recommendations

F30J3R0E is the preferred substitute when power dissipation requirements do not exceed 30W. This part maintains full RoHS3 compliance and active product status, ensuring long-term availability and regulatory alignment with the main part F40J3R0E.

F30J3R0 is functionally equivalent but carries RoHS non-compliant status. Selection of this part requires confirmation that regulatory requirements for the end application do not mandate RoHS3 compliance. Both 30W alternatives feature reduced physical length (1.250" versus 2.000") compared to the main part, which may affect PCB layout considerations.

Frequently Asked Questions (FAQ)

Q: Can F30J3R0E directly replace F40J3R0E in all applications?

A: F30J3R0E is suitable for applications where continuous power dissipation does not exceed 30W. The electrical characteristics (resistance, tolerance, temperature coefficient) and mechanical mounting features are identical. Physical dimensions differ; the 30W variant is shorter in length.

Q: What is the primary difference between F30J3R0E and F30J3R0?

A: Both parts are electrically and mechanically equivalent 30W resistors. The distinction is regulatory compliance: F30J3R0E is RoHS3 compliant, while F30J3R0 is RoHS non-compliant. Selection depends on end-product regulatory requirements.

Q: Are there dimensional constraints when substituting with 30W variants?

A: Yes. The F30J3R0E and F30J3R0 have a length of 1.250" compared to 2.000" for the F40J3R0E. Width and height remain unchanged. PCB layout and thermal management considerations may require adjustment.

Q: Do all substitute parts maintain the same operating temperature range?

A: Yes. All listed parts operate across -55°C to 350°C with identical temperature coefficient of ±400ppm/°C.

Q: What compliance certifications apply to each part?

A: F40J3R0E and F30J3R0E are both RoHS3 compliant and REACH unaffected. F30J3R0 is REACH unaffected but RoHS non-compliant.