40F25KE Equivalent & Substitute Parts

Part Overview

The 40F25KE is a 25 kOhms ±1% 10W through-hole axial wirewound resistor manufactured by Ohmite, part of the Ohmicone® 40 series. This component is designed for applications requiring precision resistance with high power dissipation capability in a compact axial package. The part is currently active in production with full RoHS compliance and unlimited moisture sensitivity rating (MSL 1). Substitute parts are identified when equivalent electrical specifications and mechanical compatibility are required due to inventory constraints, supply chain considerations, or application-specific packaging preferences.

Substiute Parts

40F25KE

OhmiteIn Stock: 114440F25KE Datasheet

Current PartRFQ

RS01025K00FE73

Vishay DaleIn Stock: 30279RS01025K00FE73 Datasheet

SimilarRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution eligibility for the 40F25KE is determined by the following critical parameters:

• Resistance Value: Must be 25 kOhms
• Tolerance: Must be ±1%
• Power Rating: Must be 10W minimum
• Composition: Must be wirewound
• Temperature Coefficient: Must be ±20ppm/°C
• Package Configuration: Must be axial through-hole
• Termination Count: Must be 2 terminations

The RS01025K00FE73 manufactured by Vishay Dale meets all substitution criteria. Both parts share identical electrical specifications and axial package geometry, with minor dimensional variations within acceptable mechanical tolerances for standard PCB mounting applications.

Parameter Comparison

Engineering Selection Recommendations

Both the 40F25KE and RS01025K00FE73 are active production components with full regulatory compliance. The 40F25KE offers an extended upper operating temperature limit of 275°C compared to the RS01025K00FE73 at 250°C. The RS01025K00FE73 provides moisture-resistant construction and a slightly more compact physical footprint. Selection between these parts should be based on specific application temperature requirements and available inventory. Both components satisfy identical electrical performance criteria and are suitable for direct substitution in standard through-hole PCB applications where axial wirewound resistors are specified.

Frequently Asked Questions (FAQ)

Q: Can the RS01025K00FE73 be used as a direct replacement for the 40F25KE?

A: Yes, the RS01025K00FE73 is electrically equivalent to the 40F25KE. Both components share identical resistance value (25 kOhms), tolerance (±1%), power rating (10W), temperature coefficient (±20ppm/°C), and axial package configuration. Physical dimensions differ slightly but remain compatible with standard PCB mounting hole spacing for axial components.

Q: What is the primary difference between these two parts?

A: The primary differences are operating temperature range (40F25KE: -55°C to 275°C; RS01025K00FE73: -65°C to 250°C), physical dimensions (40F25KE is slightly larger), and the RS01025K00FE73 includes moisture-resistant construction. The 40F25KE supports higher maximum operating temperatures.

Q: Are there any compliance or certification differences?

A: Both parts are RoHS compliant. The 40F25KE carries RoHS Compliant status, while the RS01025K00FE73 carries ROHS3 Compliant status. Both meet current regulatory requirements for electronic component manufacturing.

Q: Will the dimensional differences affect PCB layout?

A: The dimensional differences are minor. The RS01025K00FE73 is slightly smaller in both diameter and length. Standard PCB designs accommodating axial resistor packages will accept both components without layout modification, as the lead spacing and termination configuration remain identical.

Q: Which part should be selected for high-temperature applications?

A: The 40F25KE is recommended for applications requiring operation above 250°C, as it supports temperatures up to 275°C. For applications within the -65°C to 250°C range, either part is suitable.