Ohmite 43F50R Equivalent & Substitute Parts

Part Overview

The Ohmite 43F50R is a 50 Ohm ±1% 3W through-hole axial wirewound resistor from the Ohmicone® 40 series. This component is currently active in production and maintains 1000 pieces in new original stock. Equivalent and substitute parts are identified when component availability is limited, supply chain disruptions occur, or when design requirements permit alternative manufacturers meeting identical electrical and mechanical specifications.

Substiute Parts

43F50R

OhmiteIn Stock: 106643F50R Datasheet

Current PartRFQ

ALSR0350R00FE12

Vishay DaleIn Stock: 1215ALSR0350R00FE12 Datasheet

DirectRFQ

RS02B50R00FS70

Vishay DaleIn Stock: 4937RS02B50R00FS70 Datasheet

MFR RecommendedRFQ

43F50RE

OhmiteIn Stock: 76843F50RE Datasheet

Parametric EquivalentRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitute parts for the 43F50R are classified based on electrical parameter equivalence and mechanical compatibility. The primary substitution criteria are:

• Resistance value: 50 Ohms
• Tolerance: ±1%
• Power rating: 3W
• Composition: Wirewound
• Package: Axial through-hole
• Temperature coefficient: ±20ppm/°C or tighter

Three substitute parts meet these core electrical requirements. The Ohmite 43F50RE is a parametric equivalent within the same manufacturer series. The Vishay Dale RS02B50R00FS70 matches the temperature coefficient specification exactly. The Vishay Dale ALSR0350R00FE12 provides equivalent electrical performance with a slightly relaxed temperature coefficient of ±30ppm/°C.

Parameter Comparison

Engineering Selection Recommendations

Ohmite 43F50RE: This part is a parametric equivalent within the Ohmite 40 series, maintaining identical electrical specifications and physical dimensions to the 43F50R. The 43F50RE achieves RoHS Compliance, providing an upgrade path for designs requiring regulatory compliance. This substitute is optimal when maintaining the original manufacturer is preferred and RoHS compliance is required.

Vishay Dale RS02B50R00FS70: This part matches the temperature coefficient specification of ±20ppm/°C and provides the highest inventory availability at 4881 pieces. The RS02B50R00FS70 features moisture-resistant construction and operates across -65°C to 250°C. Physical dimensions are slightly smaller (0.187" Dia x 0.560" L). This substitute is suitable for applications where extended temperature range and moisture resistance are beneficial, provided PCB layout accommodates the reduced physical size.

Vishay Dale ALSR0350R00FE12: This part provides equivalent electrical performance with a temperature coefficient of ±30ppm/°C and achieves ROHS3 Compliance. The ALSR0350R00FE12 includes moisture-resistant features and operates across -65°C to 250°C. Physical dimensions are the smallest of the group (0.180" Dia x 0.500" L). This substitute is appropriate for applications where RoHS3 compliance is mandatory and the relaxed temperature coefficient tolerance is acceptable.

Frequently Asked Questions (FAQ)

Q: Can the 43F50RE be used as a direct replacement for the 43F50R?

A: Yes. The 43F50RE maintains identical electrical parameters (50 Ohms ±1%, 3W, ±20ppm/°C) and physical dimensions (0.220" Dia x 0.594" L). The primary difference is RoHS compliance status. Both are Ohmite Ohmicone® 40 series components.

Q: What are the physical size differences between substitute parts?

A: The 43F50R and 43F50RE are 0.220" diameter by 0.594" length. The RS02B50R00FS70 is 0.187" diameter by 0.560" length. The ALSR0350R00FE12 is 0.180" diameter by 0.500" length. Verify PCB layout clearances before selecting smaller alternatives.

Q: Which substitute offers the best inventory availability?

A: The Vishay Dale RS02B50R00FS70 maintains the highest stock level at 4881 pieces in new original condition.

Q: Are all substitutes rated for the same temperature range?

A: The 43F50R and 43F50RE do not specify operating temperature ranges. The RS02B50R00FS70 and ALSR0350R00FE12 both operate from -65°C to 250°C, providing defined thermal performance specifications.

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

A: The RS02B50R00FS70 and ALSR0350R00FE12 include moisture-resistant features. The 43F50R and 43F50RE do not specify this feature. Moisture-resistant construction provides enhanced performance in humid or corrosive environments.

Q: Which substitute parts are RoHS compliant?

A: The 43F50RE is RoHS Compliant. The ALSR0350R00FE12 is ROHS3 Compliant. The 43F50R and RS02B50R00FS70 are RoHS non-compliant.

Q: Can I use the ALSR0350R00FE12 if my design requires ±20ppm/°C temperature coefficient?

A: The ALSR0350R00FE12 has a temperature coefficient of ±30ppm/°C, which is less stringent than ±20ppm/°C. Use this part only if your circuit design tolerates the relaxed specification.