Equivalent & Substitute Parts for Ohmite 825F25R

Part Overview

The Ohmite 825F25R is a 25 Ohms ±1% 25W wirewound chassis mount resistor from the Metal-Mite®89 series. This component is classified as obsolete, making identification of suitable substitute parts essential for ongoing system maintenance and new design implementations. The part features aluminum housing with flanged mounting and solder lug termination, designed for applications requiring precision resistance and high power dissipation in a compact form factor.

Substiute Parts

825F25R

OhmiteIn Stock: 984825F25R Datasheet

Current PartRFQ

825F25RE

OhmiteIn Stock: 1158825F25RE Datasheet

DirectRFQ

RH02525R00FC02

Vishay DaleIn Stock: 834RH02525R00FC02 Datasheet

DirectRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution eligibility for the 825F25R is determined by strict equivalence across the following critical parameters:

• Electrical Specifications: Resistance value (25 Ohms), tolerance (±1%), and power rating (25W) must be identical
• Thermal Characteristics: Temperature coefficient (±20ppm/°C) and operating temperature range must match or exceed the original specification
• Mechanical Compatibility: Aluminum housing, flanged mounting, and solder lug termination must be preserved
• Package Configuration: Axial, box-style packaging must be maintained for form factor compatibility

Two substitute parts meet these criteria: the Ohmite 825F25RE and the Vishay Dale RH02525R00FC02. Both maintain identical electrical and mechanical specifications as the original 825F25R.

Parameter Comparison

Engineering Selection Recommendations

Ohmite 825F25RE: This substitute is the primary recommendation for new designs and replacements. It maintains identical electrical and mechanical specifications to the 825F25R while offering active product status and ROHS3 compliance. The packaging format (Tray) differs from the original, but this does not affect functional compatibility. Current inventory availability is 1105 pieces.

Vishay Dale RH02525R00FC02: This substitute provides functional equivalence with identical electrical specifications and mechanical form factor. The operating temperature range is limited to -55°C ~ 250°C compared to the original 275°C maximum, which may restrict use in high-temperature applications. REACH status is listed as affected. Current inventory availability is 760 pieces.

Frequently Asked Questions (FAQ)

Q: Can the 825F25RE be used as a direct replacement for the 825F25R? A: Yes. The 825F25RE maintains identical resistance (25 Ohms), tolerance (±1%), power rating (25W), temperature coefficient (±20ppm/°C), and mechanical configuration. The primary difference is product status (active vs. obsolete) and improved RoHS3 compliance.

Q: What is the key difference between the Ohmite and Vishay Dale substitutes? A: Both parts are electrically and mechanically equivalent. The Vishay Dale RH02525R00FC02 has a reduced maximum operating temperature of 250°C versus 275°C for the Ohmite 825F25RE. Selection depends on application temperature requirements and regulatory compliance needs.

Q: Does packaging format affect compatibility? A: Packaging format (Tray vs. Bulk vs. Box) does not affect the functional performance or mechanical fit of the resistor. Selection should be based on procurement and assembly requirements.

Q: Are there compliance considerations for substitute selection? A: The Ohmite 825F25RE offers ROHS3 compliance, making it suitable for applications with RoHS requirements. The Vishay Dale RH02525R00FC02 is RoHS non-compliant but has REACH affected status. Compliance requirements should guide selection based on end-use regulations.

Q: What is the temperature coefficient significance? A: All three parts share an identical temperature coefficient of ±20ppm/°C, ensuring consistent resistance stability across the operating temperature range. This parameter is critical for precision applications and does not differentiate the substitutes.