HS25 25R F Wirewound Chassis Mount Resistor - Equivalent & Substitute Parts

Part Overview

The HS25 25R F is a 25-watt wirewound chassis mount resistor manufactured by Ohmite, designed for applications requiring high power dissipation with precision tolerance. This active product features a 25-ohm resistance value at ±1% tolerance and is housed in an aluminum chassis mount package with flanged solder lugs for secure mounting. The component is RoHS compliant and rated for pulse withstanding applications. Substitute parts are identified when original inventory is unavailable or when packaging format requirements differ while maintaining electrical and mechanical compatibility.

Substiute Parts

HS25 25R F

OhmiteIn Stock: 1025HS25 25R F Datasheet

Current PartRFQ

825F25RE

OhmiteIn Stock: 1158825F25RE Datasheet

DirectRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution eligibility for the HS25 25R F is determined by strict equivalence across the following critical parameters:

• Electrical Equivalence: Resistance value (25 Ohms), tolerance (±1%), and power rating (25W) must be identical
• Construction Type: Wirewound composition required for thermal and electrical performance matching
• Housing Material: Aluminum chassis mount construction mandatory for mechanical compatibility
• Mounting Interface: Flanged solder lug configuration required for board-level integration
• Compliance Status: Active product status with current RoHS certification

The substitute part 825F25RE meets all substitution criteria. Both components share identical electrical specifications and mechanical mounting interfaces. Differences in temperature coefficient range and operating temperature specifications do not affect substitution eligibility, as these represent enhanced performance characteristics of the substitute rather than incompatibilities. Packaging format differs (Box vs. Tray), but this is a supply chain consideration only and does not impact functional equivalence.

Parameter Comparison

Engineering Selection Recommendations

Both the HS25 25R F and 825F25RE are active products from Ohmite with current RoHS compliance certifications. Selection between these components should be based on:

HS25 25R F: Select when original part number specification is required or when Box packaging format is mandated by procurement standards.

825F25RE: Select as a direct substitute when HS25 25R F inventory is unavailable. This component offers equivalent electrical performance with a tighter temperature coefficient specification (±20ppm/°C vs. 100ppm/°C), making it suitable for applications with enhanced thermal stability requirements. The Tray packaging format may provide cost advantages in high-volume procurement scenarios.

Both components are suitable for direct board-level substitution without circuit redesign or performance degradation.

Frequently Asked Questions (FAQ)

Q: Can 825F25RE be used as a direct replacement for HS25 25R F in existing designs?

A: Yes. Both components share identical resistance (25 Ohms), tolerance (±1%), power rating (25W), and mechanical mounting interfaces (flanged solder lugs). No circuit modifications are required.

Q: What is the difference in temperature coefficient between these parts?

A: The HS25 25R F specifies 100ppm/°C, while the 825F25RE specifies ±20ppm/°C. The substitute part has a tighter temperature coefficient, meaning its resistance value remains more stable across temperature variations. This is a performance enhancement, not a limitation.

Q: Are there packaging differences between these parts?

A: Yes. The HS25 25R F is supplied in Box packaging, while the 825F25RE is supplied in Tray packaging. Both use identical Axial, Box case styles. Packaging format does not affect electrical or mechanical compatibility.

Q: Do both parts meet current RoHS requirements?

A: Yes. The HS25 25R F is RoHS Compliant, and the 825F25RE is ROHS3 Compliant, meeting current environmental and hazardous substance regulations.

Q: What mounting interfaces do these resistors use?

A: Both components feature aluminum chassis mount construction with flanged solder lugs, enabling secure board-level mounting without additional mechanical fasteners.

Q: Can these parts be used interchangeably in high-temperature applications?

A: Yes. Both components are rated for high-temperature operation. The 825F25RE specifies an operating range of -55°C to 275°C, providing documented thermal performance across extended temperature ranges suitable for industrial and aerospace applications.