F10J40R Equivalent & Substitute Parts

Part Overview

The F10J40R is a 10-watt wirewound chassis mount resistor manufactured by Ohmite, part of the Stackohm® 250 series. This component is rated for 40 ohms with ±5% tolerance and is designed for high-power applications requiring reliable thermal dissipation. The part is currently active in production with 879 units in stock. Identifying equivalent and substitute parts is essential for procurement flexibility, supply chain continuity, and compliance with evolving regulatory standards.

Substiute Parts

F10J40R

OhmiteIn Stock: 942F10J40R Datasheet

Current PartRFQ

F10J40RE

OhmiteIn Stock: 862F10J40RE Datasheet

Parametric EquivalentRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution for the F10J40R is determined by strict equivalence across all critical electrical and mechanical parameters. The substitute part must maintain identical resistance value (40 ohms), tolerance (±5%), power rating (10W), composition (wirewound), temperature coefficient (±260ppm/°C), physical dimensions (0.750" L x 0.375" W), mounting configuration (flange braces, right angle), lead style (solder lugs), and package type (radial, flat oval). The F10J40RE meets all these criteria and is classified as a parametric equivalent. The primary distinction between these parts is packaging format (box versus bulk) and RoHS compliance status.

Parameter Comparison

Engineering Selection Recommendations

The F10J40RE serves as a direct parametric equivalent to the F10J40R for applications requiring identical electrical and mechanical performance. Selection between these parts should be based on the following criteria:

F10J40R is appropriate for applications where RoHS non-compliant components are acceptable and box packaging is preferred for inventory management or traceability requirements.

F10J40RE is the preferred choice for applications subject to ROHS3 compliance mandates or where bulk packaging aligns with procurement workflows. The extended operating temperature range specification (-55°C ~ 350°C versus up to 350°C) provides additional documentation of low-temperature performance, though both parts maintain identical thermal coefficients and composition.

Both parts are active products with adequate inventory levels and are suitable for direct substitution in circuit designs without modification to PCB layouts or thermal management strategies.

Frequently Asked Questions (FAQ)

Q: Can F10J40RE be used as a direct replacement for F10J40R? A: Yes. The F10J40RE is a parametric equivalent with identical resistance, tolerance, power rating, temperature coefficient, physical dimensions, mounting configuration, and lead style. The parts are electrically and mechanically interchangeable.

Q: What is the difference between F10J40R and F10J40RE? A: The primary differences are packaging format (box versus bulk) and RoHS compliance status. F10J40R is RoHS non-compliant, while F10J40RE is ROHS3 compliant. The F10J40RE also specifies an extended operating temperature range of -55°C ~ 350°C compared to the F10J40R specification of up to 350°C.

Q: Does packaging format affect electrical performance? A: No. Box and bulk packaging formats do not affect component electrical or thermal characteristics. Packaging selection is a procurement and logistics consideration only.

Q: Which part should be selected for RoHS-compliant applications? A: The F10J40RE is ROHS3 compliant and must be used for applications subject to RoHS regulatory requirements.

Q: Are the physical dimensions identical between both parts? A: Yes. Both F10J40R and F10J40RE have identical dimensions of 0.750" L x 0.375" W (19.05mm x 9.53mm) with a maximum seated height of 0.375" (9.53mm). PCB footprints and mounting hardware are identical.

Q: What is the temperature operating range for each part? A: F10J40R operates up to 350°C. F10J40RE operates across -55°C ~ 350°C. Both maintain the same temperature coefficient of ±260ppm/°C across their respective ranges.