Equivalent & Substitute Parts for Ohmite 805F25R

Part Overview

The Ohmite 805F25R is a 25 Ohms ±1% 5W wirewound chassis mount resistor from the Metal-Mite®89 series. This component is classified as obsolete, making identification of suitable alternatives essential for ongoing design support and production continuity. The part features aluminum housing with flanged mounting and solder lug termination, designed for applications requiring precision wirewound performance in the 5W power range.

Substiute Parts

805F25R

OhmiteIn Stock: 782805F25R Datasheet

Current PartRFQ

805F25RE

OhmiteIn Stock: 1133805F25RE Datasheet

DirectRFQ

RH00525R00FC02

Vishay DaleIn Stock: 1268RH00525R00FC02 Datasheet

DirectRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution eligibility for the 805F25R is determined by the following critical parameters:

• Resistance value: 25 Ohms (exact match required)
• Tolerance: ±1% (exact match required)
• Composition: Wirewound (exact match required)
• Temperature Coefficient: ±20ppm/°C (exact match required)
• Housing Type: Aluminum with flanged mounting (exact match required)
• Lead Style: Solder Lugs (exact match required)
• Package Type: Axial, Box (exact match required)

Power rating may exceed the original 5W specification while maintaining functional compatibility, provided all other parameters remain constant. Operating temperature range and compliance certifications are secondary selection criteria that do not affect electrical substitution validity.

Parameter Comparison

Engineering Selection Recommendations

The 805F25R is obsolete and requires substitution for new production or ongoing support. Two qualified alternatives are available:

805F25RE (Ohmite) is the primary substitute. This part maintains identical electrical specifications and physical dimensions while offering active product status and ROHS3 compliance. The packaging format differs (Tray versus original Box packaging), but electrical and mechanical compatibility is complete.

RH00525R00FC02 (Vishay Dale) provides an alternative from a different manufacturer. This part exceeds the original power rating at 7.5W while maintaining all critical electrical parameters. The maximum seated height increases by 0.005" (0.13mm) and the upper operating temperature limit is reduced to 250°C. This part is suitable for applications where the reduced temperature range and minimal height variance are acceptable.

Frequently Asked Questions (FAQ)

Q: Can the 805F25RE directly replace the 805F25R in existing designs?

A: Yes. The 805F25RE maintains identical resistance, tolerance, power rating, temperature coefficient, dimensions, and mounting configuration. The only differences are product status (Active versus Obsolete) and RoHS compliance (ROHS3 versus non-compliant). Electrical and mechanical substitution is direct.

Q: What is the significance of the higher power rating in the RH00525R00FC02?

A: The 7.5W rating indicates the component can dissipate additional power without exceeding thermal limits. In applications requiring only 5W, this provides design margin. The higher rating does not affect electrical performance at the original 5W specification.

Q: Are there packaging considerations when substituting the 805F25RE?

A: The 805F25RE is supplied in Tray packaging rather than Box packaging. This affects handling and storage procedures but does not impact electrical or mechanical performance. Verify that your assembly process accommodates tray-format components.

Q: Does the 0.005" height difference in the RH00525R00FC02 affect PCB layout?

A: The RH00525R00FC02 seated height is 0.335" (8.51mm) versus 0.330" (8.38mm) for the original. This 0.005" (0.13mm) difference is negligible for most applications. Verify clearance in space-constrained designs before selection.

Q: What is the impact of the reduced operating temperature range in the RH00525R00FC02?

A: The RH00525R00FC02 operates to 250°C maximum versus 275°C for the original. For applications requiring operation above 250°C, the 805F25RE is the appropriate choice. For standard industrial applications, the 250°C limit is typically sufficient.