Ohmite 40F4R0 Equivalent & Substitute Parts

Part Overview

The Ohmite 40F4R0 is a 4 Ohm, ±1% tolerance, 10W axial wirewound through-hole resistor from the Ohmicone® 40 series. This component is designed for applications requiring precision resistance with high power dissipation in a compact axial package. The part is currently active in production with 1,067 units in stock. Substitute parts are identified to provide alternative sourcing options while maintaining identical electrical and mechanical specifications.

Substiute Parts

40F4R0

OhmiteIn Stock: 108340F4R0 Datasheet

Current PartRFQ

40F4R0E

OhmiteIn Stock: 81940F4R0E Datasheet

Parametric EquivalentRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitute parts for the 40F4R0 are identified based on strict parametric equivalence. The following criteria determine substitutability:

• Resistance value: 4 Ohms (exact match required)
• Tolerance: ±1% (exact match required)
• Power rating: 10W (exact match required)
• Composition: Wirewound (exact match required)
• Temperature coefficient: ±50ppm/°C (exact match required)
• Package type: Axial (exact match required)
• Physical dimensions: 0.406" Dia × 1.902" L (exact match required)
• Number of terminations: 2 (exact match required)

The 40F4R0E meets all parametric requirements and is classified as a parametric equivalent. Differences in packaging format (Bulk vs. standard) and RoHS compliance status do not affect electrical or mechanical interchangeability.

Parameter Comparison

Engineering Selection Recommendations

Both the 40F4R0 and 40F4R0E are active production components from Ohmite with identical electrical and mechanical specifications. Selection between these parts should be based on regulatory and compliance requirements:

The 40F4R0E offers ROHS3 compliance, making it suitable for applications subject to RoHS directives. The 40F4R0 is RoHS non-compliant and should be selected only when RoHS compliance is not a requirement. Both parts carry the same ECCN and HTSUS classifications. Inventory availability and packaging format (Bulk for 40F4R0E) may also influence selection based on procurement volume and logistics requirements.

Frequently Asked Questions (FAQ)

Q: Can the 40F4R0E be used as a direct replacement for the 40F4R0?

A: Yes. The 40F4R0E is a parametric equivalent with identical resistance, tolerance, power rating, composition, temperature coefficient, package type, and physical dimensions. Direct substitution is electrically and mechanically compatible.

Q: What is the difference between the 40F4R0 and 40F4R0E?

A: The primary differences are packaging format (standard vs. Bulk) and RoHS compliance status. The 40F4R0E is ROHS3 compliant, while the 40F4R0 is RoHS non-compliant. All electrical and mechanical parameters are identical.

Q: Does RoHS compliance affect performance or reliability?

A: No. RoHS compliance relates to material composition and environmental regulations, not electrical performance or reliability. Both parts meet identical performance specifications.

Q: Are there any dimensional differences between these parts?

A: No. Both parts have identical physical dimensions of 0.406" Dia × 1.902" L (10.30mm × 48.30mm) and are packaged in the same axial configuration.

Q: Which part should I select for new designs?

A: Selection depends on regulatory requirements. For applications requiring RoHS compliance, select the 40F4R0E. For applications without RoHS requirements, either part is suitable based on availability and procurement preferences.