Ohmite 40F40R Equivalent & Substitute Parts

Part Overview

The Ohmite 40F40R is a 40 Ohm, 1% tolerance, 10W axial wirewound through-hole resistor from the Ohmicone® 40 series. This component is classified as Active product status with 1082 units currently in stock. Equivalent and substitute parts are identified when identical electrical specifications and mechanical form factors are required for circuit design flexibility, supply chain alternatives, or specific packaging requirements.

Substiute Parts

40F40R

OhmiteIn Stock: 116440F40R Datasheet

Current PartRFQ

40F40RE

OhmiteIn Stock: 100940F40RE Datasheet

Parametric EquivalentRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution for the 40F40R is determined by strict equivalence across all critical electrical and mechanical parameters: resistance value (40 Ohms), tolerance (±1%), power rating (10W), composition (wirewound), package type (axial), temperature coefficient (±20ppm/°C), and physical dimensions (0.406" Dia x 1.902" L). The substitute part 40F40RE meets all these criteria and is therefore classified as a parametric equivalent. Packaging configuration differences (standard vs. bulk) do not affect electrical or mechanical compatibility.

Parameter Comparison

Engineering Selection Recommendations

Both the 40F40R and 40F40RE are Active status components suitable for direct substitution in applications requiring 40 Ohm, 10W axial wirewound resistors. The 40F40RE offers ROHS3 compliance, making it the preferred choice for applications subject to RoHS regulations. The 40F40R remains available for legacy designs or applications where RoHS compliance is not required. Both parts share identical electrical performance and mechanical form factor, ensuring pin-compatible replacement without circuit redesign.

Frequently Asked Questions (FAQ)

Q: Can the 40F40RE replace the 40F40R in existing designs? A: Yes. Both parts are parametric equivalents with identical resistance, tolerance, power rating, temperature coefficient, and axial package dimensions. Direct substitution is electrically and mechanically compatible.

Q: What is the difference between 40F40R and 40F40RE? A: The primary difference is RoHS compliance status. The 40F40RE is ROHS3 compliant, while the 40F40R is RoHS non-compliant. All electrical and mechanical specifications are identical.

Q: Are there packaging differences between these parts? A: The 40F40R uses standard packaging while the 40F40RE uses bulk packaging. This distinction affects ordering and handling but does not impact electrical performance or physical dimensions.

Q: Which part should I select for new designs? A: Selection depends on regulatory requirements. For designs requiring RoHS compliance, specify the 40F40RE. For legacy or non-regulated applications, either part is acceptable based on availability.

Q: Do these parts have identical temperature coefficients? A: Yes. Both the 40F40R and 40F40RE have a temperature coefficient of ±20ppm/°C, ensuring equivalent thermal performance across operating conditions.