Ohmite 41F18R Equivalent & Substitute Parts

Part Overview

The Ohmite 41F18R is an 18 Ohm, 1% tolerance, 1W axial wirewound through-hole resistor from the Ohmicone® 40 series. This component is classified as Active product status with 895 units currently in stock. Equivalent and substitute parts are identified when component availability is limited, procurement lead times are extended, or design flexibility requires alternative sourcing options while maintaining electrical and mechanical compatibility.

Substiute Parts

41F18R

OhmiteIn Stock: 94241F18R Datasheet

Current PartRFQ

41F18RE

OhmiteIn Stock: 122141F18RE Datasheet

DirectRFQ

ALSR0118R00FE12

Vishay DaleIn Stock: 1006ALSR0118R00FE12 Datasheet

DirectRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitute parts for the 41F18R are qualified based on the following critical parameters:

• Resistance Value: Must be 18 Ohms
• Tolerance: Must be ±1%
• Power Rating: Must be 1W
• Composition: Must be Wirewound
• Package Type: Must be Axial
• Termination Count: Must be 2

The identified substitutes meet these core electrical and mechanical requirements. Variations in temperature coefficient, physical dimensions within acceptable tolerances, and RoHS compliance status do not disqualify a part from substitution eligibility.

Parameter Comparison

Engineering Selection Recommendations

41F18RE (Ohmite): This part is an exact electrical and mechanical match to the 41F18R, differing only in packaging format (Bulk vs. standard) and RoHS compliance status. The 41F18RE achieves ROHS3 compliance while maintaining identical electrical specifications. This substitute is preferred when RoHS3 compliance is required or when Ohmite sourcing continuity is prioritized.

ALSR0118R00FE12 (Vishay Dale): This Vishay Dale ALSR series resistor meets all core electrical requirements with identical resistance, tolerance, and power rating. The temperature coefficient is ±30ppm/°C compared to ±20ppm/°C for the primary part. Physical dimensions are slightly smaller (0.110" Dia x 0.406" L versus 0.126" Dia x 0.437" L), which may provide layout advantages in space-constrained applications. This part is ROHS3 compliant and carries Moisture Resistant features. Use this substitute when cross-manufacturer sourcing is acceptable and dimensional flexibility exists.

Frequently Asked Questions (FAQ)

Q: Can the 41F18RE be used as a direct replacement for the 41F18R?

A: Yes. The 41F18RE is electrically and mechanically identical to the 41F18R. Both are 18 Ohm, ±1%, 1W axial wirewound resistors with identical physical dimensions and temperature coefficients. The primary difference is RoHS compliance status and packaging format.

Q: What is the significance of the temperature coefficient difference between the 41F18R and ALSR0118R00FE12?

A: The 41F18R has a temperature coefficient of ±20ppm/°C, while the ALSR0118R00FE12 has ±30ppm/°C. This means the Vishay Dale part exhibits a slightly larger resistance change across temperature extremes. For applications with tight tolerance requirements across wide temperature ranges, the Ohmite parts are preferred.

Q: Are the physical dimension differences between the 41F18R and ALSR0118R00FE12 significant?

A: The ALSR0118R00FE12 is slightly smaller (0.110" Dia x 0.406" L versus 0.126" Dia x 0.437" L). This difference is minor and typically does not affect PCB layout compatibility for standard through-hole designs. However, verify clearance in space-constrained applications before substitution.

Q: Which substitute part should I select if RoHS3 compliance is mandatory?

A: Both 41F18RE and ALSR0118R00FE12 are ROHS3 compliant. The 41F18RE maintains exact Ohmite specifications, while the ALSR0118R00FE12 provides cross-manufacturer flexibility with slightly different thermal characteristics.

Q: Can these parts be used interchangeably in all applications?

A: All three parts meet the core electrical and mechanical requirements for 18 Ohm, 1W, ±1% axial wirewound resistor applications. Selection should be based on RoHS compliance requirements, temperature coefficient tolerance, and sourcing availability for your specific application.