Ohmite 41F4R0 Equivalent & Substitute Parts

Part Overview

The Ohmite 41F4R0 is a 4 Ohm ±1% 1W through-hole resistor with axial wirewound construction, part of the Ohmicone® 40 series. This component is currently active in production and maintains 883 pieces in new original stock. The part is RoHS non-compliant and classified under ECCN EAR99. Equivalent and substitute parts are identified based on matching electrical specifications (resistance value, tolerance, power rating, temperature coefficient) and mechanical compatibility (axial package, through-hole termination, physical dimensions).

Key Parameters

Parameter	Specification
Resistance	4 Ohms
Tolerance	±1%
Power Rating	1W
Composition	Wirewound
Temperature Coefficient	±50ppm/°C
Package Type	Axial
Terminations	2
Physical Dimensions	0.126" Dia x 0.437" L (3.20mm x 11.10mm)

Substitute Part Grouping Explanation

Substitution eligibility for the 41F4R0 is determined by strict equivalence across the following parameters: resistance value (4 Ohms), tolerance (±1%), power dissipation (1W), temperature coefficient (±50ppm/°C), composition (wirewound), package configuration (axial through-hole), and number of terminations (2). All identified substitute parts meet these core electrical and mechanical requirements. Physical dimensions may vary within acceptable tolerances for axial through-hole mounting. Compliance certifications and RoHS status differ among substitutes and must be evaluated against application requirements.

Parameter Comparison

Parameter	41F4R0 (Ohmite)	41F4R0E (Ohmite)	ALSR014R000FE12 (Vishay Dale)	RS01A4R000FS70 (Vishay Dale)
Resistance	4 Ohms	4 Ohms	4 Ohms	4 Ohms
Tolerance	±1%	±1%	±1%	±1%
Power Rating	1W	1W	1W	1W
Composition	Wirewound	Wirewound	Wirewound	Wirewound
Temperature Coefficient	±50ppm/°C	±50ppm/°C	±50ppm/°C	±50ppm/°C
Package	Axial	Axial	Axial	Axial
Terminations	2	2	2	2
Dimensions	0.126" Dia x 0.437" L (3.20mm x 11.10mm)	0.126" Dia x 0.437" L (3.20mm x 11.10mm)	0.110" Dia x 0.406" L (2.79mm x 10.31mm)	0.094" Dia x 0.406" L (2.39mm x 10.31mm)
RoHS Status	Non-compliant	Compliant	ROHS3 Compliant	Non-compliant
Operating Temperature	Not specified	Not specified	-65°C ~ 250°C	-65°C ~ 250°C
Features	Standard	Silicone coating	Moisture Resistant	Moisture Resistant
Inventory	883 Pcs	1587 Pcs	826 Pcs	2022 Pcs

Engineering Selection Recommendations

All four parts meet the core electrical and mechanical substitution criteria. Selection should be based on compliance and environmental requirements:

The Ohmite 41F4R0E provides direct manufacturer equivalence with identical dimensions and improved RoHS compliance status. This part is recommended for applications requiring RoHS compliance with maximum inventory availability.

The Vishay Dale ALSR014R000FE12 offers ROHS3 compliance and moisture-resistant construction with specified operating temperature range (-65°C ~ 250°C). Slightly reduced physical dimensions may require verification for mechanical fit in existing PCB layouts.

The Vishay Dale RS01A4R000FS70 is manufacturer-recommended and provides the highest inventory level (2022 pieces). It includes moisture-resistant features and specified operating temperature range. RoHS non-compliance and REACH-affected status require evaluation against application regulatory requirements. Smallest physical dimensions require mechanical compatibility verification.

Frequently Asked Questions (FAQ)

Q: Can the 41F4R0E be used as a direct replacement for the 41F4R0?

A: Yes. Both parts are manufactured by Ohmite with identical electrical specifications (4 Ohms ±1%, 1W, ±50ppm/°C) and physical dimensions (0.126" Dia x 0.437" L). The primary difference is RoHS compliance status; the 41F4R0E is RoHS compliant while the 41F4R0 is not.

Q: What are the dimensional differences between substitute parts?

A: The Ohmite 41F4R0 and 41F4R0E measure 0.126" Dia x 0.437" L. The Vishay Dale ALSR014R000FE12 measures 0.110" Dia x 0.406" L. The Vishay Dale RS01A4R000FS70 measures 0.094" Dia x 0.406" L. Smaller diameter and length may affect PCB layout compatibility and should be verified before substitution.

Q: Are all substitute parts suitable for high-temperature applications?

A: The Ohmite parts (41F4R0 and 41F4R0E) do not specify operating temperature ranges. The Vishay Dale parts (ALSR014R000FE12 and RS01A4R000FS70) specify -65°C ~ 250°C operating range. For applications requiring extended temperature operation, Vishay Dale substitutes are preferred.

Q: What is the difference between moisture-resistant and standard wirewound construction?

A: The Vishay Dale ALSR014R000FE12 and RS01A4R000FS70 include moisture-resistant features. The Ohmite 41F4R0E includes silicone coating. These features provide enhanced environmental protection. Standard construction (41F4R0) offers no specified moisture protection.

Q: Which substitute has the best inventory availability?

A: The Vishay Dale RS01A4R000FS70 has the highest inventory at 2022 pieces in new original stock, followed by the Ohmite 41F4R0E at 1587 pieces.

Q: Are there RoHS compliance considerations for these parts?

A: The Ohmite 41F4R0 is RoHS non-compliant. The 41F4R0E is RoHS compliant. The Vishay Dale ALSR014R000FE12 is ROHS3 compliant. The RS01A4R000FS70 is RoHS non-compliant. Applications subject to RoHS regulations should use either the 41F4R0E or ALSR014R000FE12.

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