Ohmite 41F500 500 Ohm 1W Axial Wirewound Resistor Equivalent & Substitute Parts

Part Overview

The Ohmite 41F500 is a 500 Ohm ±1% 1W through-hole axial wirewound resistor from the Ohmicone® 40 series. This component is actively manufactured and maintains 794 pieces in current inventory stock. The part is classified as RoHS non-compliant and is subject to standard export controls (ECCN EAR99). Equivalent and substitute parts are identified to support procurement flexibility, supply chain continuity, and application-specific compliance requirements.

Key Parameters

Parameter	Value
Resistance	500 Ohms
Tolerance	±1%
Power Rating	1W
Composition	Wirewound
Package Type	Axial
Temperature Coefficient	±20ppm/°C
Size / Dimension	0.126" Dia x 0.437" L (3.20mm x 11.10mm)
Number of Terminations	2
RoHS Status	RoHS non-compliant

Substitute Part Grouping Explanation

Substitute parts for the Ohmite 41F500 are qualified based on the following electrical and mechanical parameters:

Core Substitution Criteria:

Resistance value: 500 Ohms
Tolerance: ±1%
Power rating: 1W
Composition: Wirewound
Package: Axial through-hole
Number of terminations: 2

Allowed Parameter Variations:

Temperature coefficient: ±20ppm/°C to ±30ppm/°C
Physical dimensions: Minor variations within axial package constraints (0.110" to 0.126" diameter; 0.406" to 0.437" length)
RoHS compliance status: May differ from main part
Packaging format: Bulk or standard packaging acceptable
Series designation: Different series within same manufacturer or cross-manufacturer equivalents

Two substitute parts meet these criteria and are listed below.

Parameter Comparison

Parameter	Ohmite 41F500	Ohmite 41F500E	Vishay Dale ALSR01500R0FE12
Manufacturer	Ohmite	Ohmite	Vishay Dale
Resistance	500 Ohms	500 Ohms	500 Ohms
Tolerance	±1%	±1%	±1%
Power Rating	1W	1W	1W
Composition	Wirewound	Wirewound	Wirewound
Temperature Coefficient	±20ppm/°C	±20ppm/°C	±30ppm/°C
Package / Case	Axial	Axial	Axial
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)	0.110" Dia x 0.406" L (2.79mm x 10.31mm)
Number of Terminations	2	2	2
RoHS Status	RoHS non-compliant	RoHS Compliant	ROHS3 Compliant
Moisture Sensitivity Level	Not Applicable	1 (Unlimited)	1 (Unlimited)
Product Status	Active	Active	Active
Inventory	794 Pcs	1034 Pcs	1124 Pcs

Engineering Selection Recommendations

Ohmite 41F500E (Parametric Equivalent): This part maintains identical electrical specifications and physical dimensions to the main part 41F500. The primary distinction is RoHS compliance status; 41F500E is RoHS Compliant, whereas 41F500 is RoHS non-compliant. Selection of 41F500E is appropriate for applications requiring RoHS compliance or when supply of the original part is constrained. Inventory availability is higher (1034 pieces vs. 794 pieces).

Vishay Dale ALSR01500R0FE12 (Direct Manufacturer Equivalent): This part meets all core electrical specifications (500 Ohms, ±1%, 1W, wirewound, axial). The ALSR series includes moisture-resistant construction, which provides enhanced environmental protection. Physical dimensions are slightly smaller (0.110" diameter vs. 0.126" diameter; 0.406" length vs. 0.437" length), remaining within acceptable axial package tolerances. Temperature coefficient is ±30ppm/°C versus ±20ppm/°C for the main part. ROHS3 compliance is provided. This part is suitable for applications where moisture resistance and enhanced RoHS compliance are required. Inventory availability is highest (1124 pieces).

Frequently Asked Questions (FAQ)

Q: Can the Ohmite 41F500E be used as a direct replacement for the Ohmite 41F500?

A: Yes. The 41F500E is a parametric equivalent with identical resistance, tolerance, power rating, temperature coefficient, and physical dimensions. The only difference is RoHS compliance status. Electrical and mechanical compatibility is complete.

Q: What is the primary difference between the Ohmite 41F500 and the Vishay Dale ALSR01500R0FE12?

A: Both parts share identical electrical specifications (500 Ohms, ±1%, 1W). The Vishay Dale part features moisture-resistant construction and has a slightly smaller physical footprint (0.110" diameter vs. 0.126" diameter). Temperature coefficient tolerance is ±30ppm/°C versus ±20ppm/°C. The Vishay Dale part provides ROHS3 compliance.

Q: Are there any physical compatibility concerns when substituting the Vishay Dale ALSR01500R0FE12 for the Ohmite 41F500?

A: The Vishay Dale part has a smaller diameter (0.110" vs. 0.126") and slightly shorter length (0.406" vs. 0.437"). Both remain within standard axial package specifications. PCB hole spacing and lead diameter compatibility should be verified for the specific application, though standard through-hole spacing accommodates both sizes.

Q: Which substitute part should be selected for RoHS-compliant applications?

A: Both substitute parts are RoHS compliant. The Ohmite 41F500E is RoHS Compliant, and the Vishay Dale ALSR01500R0FE12 is ROHS3 Compliant. Either part is suitable for RoHS-compliant designs.

Q: Does the temperature coefficient difference between parts affect substitution suitability?

A: The main part and Ohmite 41F500E both specify ±20ppm/°C. The Vishay Dale ALSR01500R0FE12 specifies ±30ppm/°C. This difference is within acceptable tolerance for most general-purpose applications. Applications requiring tighter temperature stability should verify the ±30ppm/°C specification against circuit requirements.

Q: What is the moisture-resistant feature on the Vishay Dale ALSR01500R0FE12?

A: The ALSR series includes moisture-resistant construction, which provides enhanced protection in humid or corrosive environments. This feature is not present on the standard Ohmite 41F500 or 41F500E parts.

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