Equivalent & Substitute Parts for Ohmite 12FR040

Part Overview

The Ohmite 12FR040 is a 40 milliohm, ±1% tolerance, 2-watt axial through-hole resistor designed for current sensing applications. It features a non-inductive metal element construction with an operating temperature range of -55°C to 275°C. The part is currently active in production. Substitute parts may be required due to packaging preferences, compliance requirements, or inventory availability across different distribution channels.

Substiute Parts

12FR040

OhmiteIn Stock: 96612FR040 Datasheet

Current PartRFQ

12FR040E

OhmiteIn Stock: 72012FR040E Datasheet

DirectRFQ

12FR040E

OhmiteIn Stock: 72012FR040E Datasheet

DirectRFQ

Key Parameters

Substitute Part Grouping Explanation

The Ohmite 12FR040E qualifies as a direct substitute based on identical electrical and mechanical parameters. Substitution is valid when the following criteria are met:

• Resistance value: 40 mOhms
• Tolerance: ±1%
• Power rating: 2W
• Composition: Metal Element
• Features: Current Sense, Non-Inductive
• Temperature coefficient: ±50ppm/°C
• Operating temperature range: -55°C to 275°C
• Package: Axial
• Physical dimensions: 0.094" Dia x 0.417" L (2.40mm x 10.60mm)
• Number of terminations: 2

The 12FR040E differs from the main part in packaging format (bulk versus standard) and compliance certifications, but maintains full electrical and mechanical equivalence.

Parameter Comparison

Engineering Selection Recommendations

Both the 12FR040 and 12FR040E are active production parts from Ohmite with identical electrical and mechanical specifications. Selection between these parts should be based on the following factors:

The 12FR040E offers RoHS compliance, making it suitable for applications subject to RoHS regulations or customer requirements. The 12FR040 is RoHS non-compliant and should be selected only when RoHS compliance is not a requirement.

Packaging format differs between the two parts: the 12FR040 uses standard packaging while the 12FR040E uses bulk packaging. Bulk packaging may be preferred for high-volume manufacturing operations or when packaging cost reduction is a consideration.

Both parts maintain identical performance characteristics across all electrical parameters, thermal specifications, and mechanical dimensions, ensuring direct functional interchangeability in circuit applications.

Frequently Asked Questions (FAQ)

Q: Can the 12FR040E replace the 12FR040 in all applications?

A: Yes, the 12FR040E is electrically and mechanically equivalent to the 12FR040. Both parts have identical resistance, tolerance, power rating, temperature coefficient, and operating temperature range. Selection should be based on compliance requirements and packaging preferences.

Q: What is the difference between the 12FR040 and 12FR040E?

A: The primary differences are packaging format and RoHS compliance status. The 12FR040E is RoHS compliant with bulk packaging, while the 12FR040 is RoHS non-compliant with standard packaging. All electrical and mechanical parameters are identical.

Q: Are these parts suitable for current sensing applications?

A: Yes, both the 12FR040 and 12FR040E are specifically designed for current sensing applications. They feature non-inductive metal element construction with low resistance values and tight tolerance specifications.

Q: What are the physical dimensions of these resistors?

A: Both parts have identical axial dimensions of 0.094" diameter by 0.417" length, equivalent to 2.40mm by 10.60mm.

Q: What is the operating temperature range for these parts?

A: Both the 12FR040 and 12FR040E operate across a temperature range of -55°C to 275°C with a temperature coefficient of ±50ppm/°C.

Q: Which part should I select for RoHS-compliant applications?

A: The 12FR040E is RoHS compliant and should be selected for applications requiring RoHS compliance. The 12FR040 is RoHS non-compliant.