Equivalent & Substitute Parts for Ohmite 43JR50

Part Overview

The Ohmite 43JR50 is a 500 mOhms ±5% 3W through-hole resistor with axial wirewound construction, part of the Ohmicone® 40 series. This component is currently active in production and available in box packaging. Alternative part numbers exist to accommodate different tolerance requirements, packaging formats, and compliance specifications while maintaining identical electrical and mechanical characteristics.

Substiute Parts

43JR50

OhmiteIn Stock: 102843JR50 Datasheet

Current PartRFQ

43FR50

OhmiteIn Stock: 117443FR50 Datasheet

UpgradeRFQ

43JR50E

OhmiteIn Stock: 217543JR50E Datasheet

Parametric EquivalentRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution eligibility for the 43JR50 is determined by the following criteria:

Primary Substitution Parameters:

• Resistance value: 500 mOhms (exact match required)
• Power rating: 3W (exact match required)
• Composition: Wirewound (exact match required)
• Package type: Axial (exact match required)
• Physical dimensions: 0.220" Dia x 0.594" L (exact match required)
• Temperature coefficient: ±90ppm/°C (exact match required)

Secondary Substitution Parameters:

• Tolerance: ±5% or tighter (±1% acceptable as upgrade)
• Packaging format: Box or Bulk (interchangeable for component selection)
• RoHS compliance status: May vary between parts
• Product status: Active (required)

The 43JR50 has two identified substitutes: the 43FR50 (upgrade tolerance) and the 43JR50E (parametric equivalent with different packaging and compliance).

Parameter Comparison

Engineering Selection Recommendations

43JR50 (Original Specification) Use when box packaging is required and RoHS non-compliance is acceptable for the application. This part maintains the original tolerance specification of ±5%.

43FR50 (Upgrade Tolerance) Select this part when tighter tolerance control is required. The ±1% tolerance provides improved accuracy over the ±5% specification while maintaining all other electrical and mechanical parameters. RoHS non-compliance status is identical to the main part. Bulk packaging format applies.

43JR50E (RoHS3 Compliant Equivalent) Choose this part when ROHS3 compliance is a design requirement. Electrical and mechanical specifications are identical to the 43JR50, with the primary difference being regulatory compliance status. Bulk packaging format applies.

Frequently Asked Questions (FAQ)

Q: Can 43FR50 be used as a direct replacement for 43JR50? A: Yes. The 43FR50 maintains identical resistance, power rating, composition, package type, and physical dimensions. The tolerance is tighter (±1% versus ±5%), which represents an upgrade in accuracy. No circuit redesign is required.

Q: What is the difference between 43JR50 and 43JR50E? A: Both parts have identical electrical specifications (500 mOhms ±5%, 3W, ±90ppm/°C) and physical dimensions. The primary difference is RoHS compliance: 43JR50 is RoHS non-compliant, while 43JR50E is ROHS3 compliant. Packaging format also differs (Box versus Bulk).

Q: Are all three parts mechanically interchangeable? A: Yes. All three parts share identical axial package dimensions (0.220" Dia x 0.594" L), allowing direct substitution in PCB layouts and through-hole applications without modification.

Q: Which part should be selected for new designs? A: Selection depends on application requirements. For RoHS3-compliant designs, use 43JR50E. For applications requiring tighter tolerance, use 43FR50. For standard applications without compliance constraints, any of the three parts is suitable based on packaging and tolerance needs.

Q: Does tolerance affect circuit performance? A: Tolerance affects the precision of the resistance value. The ±1% tolerance of 43FR50 provides tighter control around the 500 mOhms nominal value compared to the ±5% tolerance of 43JR50 and 43JR50E. Selection depends on circuit sensitivity to resistance variation.