F40J40R Equivalent & Substitute Parts

Part Overview

The F40J40R is a 40 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 is currently active in production with 791 pieces in stock. Substitute parts are identified when packaging configurations or compliance requirements differ while maintaining identical electrical and mechanical specifications.

Substiute Parts

F40J40R

OhmiteIn Stock: 832F40J40R Datasheet

Current PartRFQ

F40J40RE

OhmiteIn Stock: 1202F40J40RE Datasheet

Parametric EquivalentRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution eligibility for the F40J40R is determined by strict equivalence across all critical electrical and mechanical parameters. The primary substitution criterion is identical resistance value (40 Ohms), tolerance (±5%), power rating (40W), composition (wirewound), temperature coefficient (±260ppm/°C), operating temperature range (-55°C to 350°C), coating type (vitreous enamel), mounting configuration (flange braces, right angle), physical dimensions (2.000" L × 1.000" W), seated height (0.563"), lead style (solder lugs), and package type (radial, flat oval).

The F40J40RE qualifies as a parametric equivalent because it maintains all electrical specifications, mechanical dimensions, and functional characteristics identical to the F40J40R. The distinction between these parts is packaging configuration: F40J40R is supplied in standard packaging, while F40J40RE is supplied in bulk packaging. Both parts belong to the Stackohm® 250 series and are manufactured by Ohmite.

Parameter Comparison

Engineering Selection Recommendations

Both F40J40R and F40J40RE are active production parts manufactured by Ohmite with identical electrical and mechanical specifications. Selection between these parts should be based on compliance requirements and packaging needs.

The F40J40RE offers ROHS3 compliance, making it suitable for applications subject to RoHS3 regulatory requirements. The F40J40R is RoHS non-compliant and should be selected only when RoHS compliance is not a design constraint.

Packaging configuration differs between the two parts: F40J40R uses standard packaging while F40J40RE uses bulk packaging. Bulk packaging is typically preferred for high-volume production environments where component handling efficiency is prioritized. Standard packaging is appropriate for lower-volume applications or when individual component traceability is required.

Both parts maintain identical REACH and ECCN classifications (REACH Unaffected, EAR99), ensuring equivalent export and supply chain compliance profiles.

Frequently Asked Questions (FAQ)

Q: Can F40J40RE be used as a direct replacement for F40J40R?

A: Yes, F40J40RE is a parametric equivalent to F40J40R. All electrical specifications (40 Ohms ±5%, 40W), mechanical dimensions, mounting configuration, and thermal characteristics are identical. The parts differ only in packaging configuration (standard vs. bulk) and RoHS compliance status.

Q: What is the difference between standard and bulk packaging?

A: Standard packaging typically includes individual component packaging with documentation and traceability information. Bulk packaging consolidates multiple units in larger containers, reducing per-unit packaging material and cost. Both packaging types contain identical components with the same electrical and mechanical properties.

Q: Does RoHS3 compliance affect component performance?

A: RoHS3 compliance indicates the absence of restricted substances in the component composition. This is a regulatory and environmental specification that does not alter electrical performance, thermal characteristics, or mechanical function. Selection between RoHS-compliant and non-compliant versions depends on application regulatory requirements, not performance criteria.

Q: Are there any mechanical compatibility issues between F40J40R and F40J40RE?

A: No. Both parts have identical physical dimensions (2.000" L × 1.000" W), seated height (0.563"), mounting features (flange braces, right angle), and lead style (solder lugs). They are mechanically interchangeable in all applications.

Q: Which part should be selected for new designs?

A: For new designs, F40J40RE is recommended when RoHS3 compliance is required or anticipated. Both parts are active in production with adequate inventory levels. Selection should align with application compliance requirements and supply chain preferences.