Ohmite 43FR50 Equivalent & Substitute Parts

Part Overview

The Ohmite 43FR50 is a 500 mOhms ±1% 3W axial wirewound through-hole resistor from the Ohmicone® 40 series. This component is classified as Active product status. Substitute parts are identified when the original part becomes unavailable, when supply constraints require alternative sourcing, or when design requirements permit equivalent electrical and mechanical specifications.

Substiute Parts

43FR50

OhmiteIn Stock: 117443FR50 Datasheet

Current PartRFQ

43FR50E

OhmiteIn Stock: 93443FR50E Datasheet

Parametric EquivalentRFQ

ALSR03R5000FE12

Vishay DaleIn Stock: 993ALSR03R5000FE12 Datasheet

DirectRFQ

43FR50E

OhmiteIn Stock: 93443FR50E Datasheet

Parametric EquivalentRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitute parts for the 43FR50 are qualified based on the following electrical and mechanical parameters:

• Resistance value: 500 mOhms
• Tolerance: ±1%
• Power rating: 3W
• Composition: Wirewound
• Package: Axial through-hole
• Temperature coefficient: ±90ppm/°C
• Termination count: 2

Two substitute parts meet these criteria and are listed below.

Parameter Comparison

Engineering Selection Recommendations

43FR50E (Ohmite): This part is a parametric equivalent with identical electrical specifications and physical dimensions to the 43FR50. The primary distinction is RoHS compliance status; the 43FR50E is RoHS Compliant, whereas the original 43FR50 is RoHS non-compliant. Selection of this substitute is appropriate for applications requiring RoHS compliance or when supply of the original part is constrained.

ALSR03R5000FE12 (Vishay Dale): This part meets all core electrical parameters and is ROHS3 Compliant. Physical dimensions differ slightly (0.180" Dia x 0.500" L versus 0.220" Dia x 0.594" L). The ALSR series includes moisture-resistant construction. This substitute is suitable for applications where the smaller form factor is compatible with board layout and where moisture resistance is beneficial or required.

Frequently Asked Questions (FAQ)

Q: Can the 43FR50E be used as a direct replacement for the 43FR50?

A: Yes. The 43FR50E is electrically and mechanically identical to the 43FR50. Both parts share the same resistance value (500 mOhms), tolerance (±1%), power rating (3W), temperature coefficient (±90ppm/°C), and physical dimensions (0.220" Dia x 0.594" L). The primary difference is RoHS compliance status.

Q: What are the physical dimension differences between the ALSR03R5000FE12 and the 43FR50?

A: The ALSR03R5000FE12 has a smaller form factor at 0.180" Dia x 0.500" L compared to the 43FR50 at 0.220" Dia x 0.594" L. Both are axial through-hole packages with identical electrical specifications. Verify that the smaller dimensions are compatible with your PCB layout and lead spacing requirements before substitution.

Q: Are all three parts electrically equivalent?

A: Yes. All three parts—43FR50, 43FR50E, and ALSR03R5000FE12—share identical electrical parameters: 500 mOhms resistance, ±1% tolerance, 3W power rating, ±90ppm/°C temperature coefficient, and 2 terminations. Substitution is based on these matching electrical specifications.

Q: What is the difference in RoHS compliance between these parts?

A: The 43FR50 is RoHS non-compliant. The 43FR50E is RoHS Compliant. The ALSR03R5000FE12 is ROHS3 Compliant. Selection depends on your application's regulatory requirements and supply chain compliance mandates.

Q: Does the ALSR03R5000FE12 moisture-resistant feature affect substitution?

A: The moisture-resistant feature of the ALSR03R5000FE12 is an additional characteristic not present in the 43FR50 or 43FR50E. This feature does not prevent substitution; it provides enhanced environmental protection in applications exposed to moisture or humidity. It is not a requirement for compatibility.