41F40RE Equivalent & Substitute Parts

Part Overview

The 41F40RE is a 1W, 40 Ohms wirewound axial resistor manufactured by Ohmite, part of the Ohmicone® 40 series. This component is designed for through-hole applications requiring precision resistive elements with tight tolerance specifications. The part is currently active in production with 773 units in stock. Equivalent and substitute parts are identified when component availability is limited, procurement lead times are extended, or design flexibility permits alternative sourcing while maintaining electrical and mechanical compatibility.

Key Parameters

Parameter	Specification
Resistance Value	40 Ohms
Tolerance	±1%
Power Rating	1W
Composition	Wirewound
Package Type	Axial
Temperature Coefficient	±20ppm/°C
Operating Temperature Range	-55°C ~ 275°C
Size / Dimension	0.126" Dia x 0.437" L (3.20mm x 11.10mm)
Number of Terminations	2
RoHS Status	RoHS Compliant

Substitute Part Grouping Explanation

Substitute parts for the 41F40RE are identified based on the following critical parameters that determine functional and mechanical compatibility:

Primary Matching Criteria:

Resistance value: 40 Ohms
Tolerance: ±1%
Power rating: 1W
Composition: Wirewound
Package type: Axial
Temperature coefficient: ±20ppm/°C
Number of terminations: 2

Substitutes are grouped into two categories:

Parametric Equivalent: Parts that match all primary electrical specifications and package configuration, differing only in packaging format (Box vs. Bulk) or non-critical attributes.

Similar Equivalent: Parts that match all primary electrical specifications and axial package type but may have minor variations in physical dimensions, operating temperature range, or compliance certifications while maintaining functional compatibility.

Parameter Comparison

Parameter	41F40RE (Ohmite)	41F40R (Ohmite)	RS01A40R00FE70 (Vishay Dale)
Manufacturer	Ohmite	Ohmite	Vishay Dale
Resistance	40 Ohms	40 Ohms	40 Ohms
Tolerance	±1%	±1%	±1%
Power Rating	1W	1W	1W
Composition	Wirewound	Wirewound	Wirewound
Package Type	Axial	Axial	Axial
Temperature Coefficient	±20ppm/°C	±20ppm/°C	±20ppm/°C
Operating Temperature	-55°C ~ 275°C	Not specified	-65°C ~ 250°C
Size / Dimension	0.126" Dia x 0.437" L (3.20mm x 11.10mm)	0.126" Dia x 0.437" L (3.20mm x 11.10mm)	0.094" Dia x 0.406" L (2.39mm x 10.31mm)
Packaging Format	Box	Bulk	Cut Tape (CT)
RoHS Status	RoHS Compliant	RoHS non-compliant	ROHS3 Compliant
Product Status	Active	Active	Active
Inventory	773 Pcs	777 Pcs	1556 Pcs

Engineering Selection Recommendations

41F40R (Ohmite) - Parametric Equivalent: This part is electrically and mechanically identical to the 41F40RE with matching dimensions and all critical electrical parameters. The primary difference is packaging format (Bulk vs. Box). Selection of this part is suitable for applications where packaging format does not impact assembly or inventory management. Note that this part carries RoHS non-compliant status, which may restrict use in regulated applications or regions with RoHS requirements.

RS01A40R00FE70 (Vishay Dale) - Similar Equivalent: This part matches all primary electrical specifications and maintains axial package configuration. Physical dimensions are slightly smaller (0.094" Dia x 0.406" L vs. 0.126" Dia x 0.437" L), which may affect PCB layout compatibility. Operating temperature range is -65°C ~ 250°C, which is narrower than the 41F40RE at the high end (250°C vs. 275°C). This part is ROHS3 Compliant and carries higher inventory availability (1556 units). Selection is appropriate for applications where the reduced physical footprint is beneficial and operating temperatures do not exceed 250°C.

Frequently Asked Questions (FAQ)

Q: Can 41F40R be used as a direct replacement for 41F40RE? A: Yes, electrically and mechanically. Both parts are Ohmite Ohmicone® 40 series resistors with identical resistance, tolerance, power rating, temperature coefficient, and physical dimensions. The difference is packaging format (Bulk vs. Box). Verify that RoHS non-compliance of 41F40R does not conflict with your application requirements or regional regulations.

Q: What are the physical dimension differences between 41F40RE and RS01A40R00FE70? A: The RS01A40R00FE70 has a smaller diameter (0.094" vs. 0.126") and slightly shorter length (0.406" vs. 0.437"). These differences may affect PCB hole spacing and component placement. Verify PCB layout compatibility before substitution.

Q: Is RS01A40R00FE70 suitable for high-temperature applications? A: The RS01A40R00FE70 operates to a maximum of 250°C, compared to 41F40RE at 275°C. If your application requires operation above 250°C, the Vishay Dale part is not suitable. Confirm your maximum operating temperature requirement before selection.

Q: What is the difference between RoHS Compliant and ROHS3 Compliant status? A: RoHS Compliant indicates compliance with the original RoHS Directive (2002/95/EC). ROHS3 Compliant indicates compliance with RoHS Recast (2011/65/EU) and its amendments. Both certifications restrict hazardous substances. The 41F40R is RoHS non-compliant and may not be acceptable in regulated applications. Verify your compliance requirements.

Q: Can I use RS01A40R00FE70 in a design originally specified for 41F40RE? A: Electrical compatibility is confirmed (40 Ohms ±1%, 1W, ±20ppm/°C, wirewound axial). Verify: (1) PCB layout accommodates the smaller physical dimensions, (2) maximum operating temperature does not exceed 250°C, (3) RoHS3 compliance meets your regulatory requirements.

Q: Which substitute part has the best availability? A: RS01A40R00FE70 (Vishay Dale) has the highest inventory at 1556 units, compared to 777 units for 41F40R and 773 units for 41F40RE.

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