805F40R Wirewound Chassis Mount Resistor - Equivalent & Substitute Parts

Part Overview

The Ohmite 805F40R is a 40 Ohms ±1% 5W wirewound chassis mount resistor from the Metal-Mite®89 series. This component is classified as obsolete, making identification of suitable substitutes essential for ongoing system support and new design implementations. The 805F40RE represents the active production equivalent within the same product family, maintaining identical electrical and mechanical specifications while offering improved compliance status.

Substiute Parts

805F40R

OhmiteIn Stock: 852805F40R Datasheet

Current PartRFQ

805F40RE

OhmiteIn Stock: 1163805F40RE Datasheet

DirectRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution eligibility for the 805F40R is determined by strict equivalence across the following critical parameters:

• Resistance value: 40 Ohms
• Tolerance: ±1%
• Power rating: 5W
• Composition: Wirewound
• Temperature coefficient: ±20ppm/°C
• Operating temperature range: -55°C to 275°C
• Mounting feature: Flanges with solder lugs
• Physical dimensions: 0.600" L x 0.646" W with 0.330" maximum seated height
• Housing material: Aluminum

The 805F40RE qualifies as a direct substitute based on complete alignment with all electrical and mechanical parameters. The primary distinction is packaging format and product status, with the 805F40RE available in tray packaging and classified as active production status.

Parameter Comparison

Engineering Selection Recommendations

The 805F40RE is the appropriate selection for applications currently using the 805F40R. Both components are electrically and mechanically identical, with the 805F40RE offering the advantage of active production status and ROHS3 compliance. The transition from the obsolete 805F40R to the 805F40RE requires no circuit redesign or application modification, as all functional parameters remain unchanged.

For new designs or system refreshes, the 805F40RE should be specified to ensure long-term component availability and regulatory compliance. The difference in packaging format (tray versus bulk) is a procurement consideration and does not affect electrical performance or mechanical fit.

Frequently Asked Questions (FAQ)

Q: Can the 805F40RE be used as a direct replacement for the 805F40R in existing assemblies?

A: Yes. The 805F40RE is electrically and mechanically identical to the 805F40R. All electrical parameters, physical dimensions, mounting features, and lead styles are equivalent. No circuit modifications are required.

Q: What is the primary difference between these two part numbers?

A: The 805F40R is obsolete, while the 805F40RE is in active production. Additionally, the 805F40RE is ROHS3 compliant, whereas the 805F40R is RoHS non-compliant. The packaging format differs (bulk versus tray), but this is a supply chain consideration only.

Q: Are there any compliance or regulatory differences between these parts?

A: Yes. The 805F40RE meets ROHS3 compliance requirements, making it suitable for applications subject to RoHS regulations. The 805F40R does not meet these requirements. Both parts are REACH Unaffected and classified as EAR99 for export control purposes.

Q: Does the tray packaging of the 805F40RE affect its performance compared to bulk packaging?

A: No. Packaging format does not affect electrical or mechanical performance. The tray packaging is a handling and storage format used during distribution and assembly processes.

Q: What are the critical parameters that define substitution eligibility for this resistor?

A: Substitution is determined by matching resistance value (40 Ohms), tolerance (±1%), power rating (5W), temperature coefficient (±20ppm/°C), operating temperature range (-55°C to 275°C), mounting configuration (flanges with solder lugs), and physical dimensions (0.600" L x 0.646" W x 0.330" height maximum).