Equivalent & Substitute Parts for Ohmite 825F500

Part Overview

The Ohmite 825F500 is a 500 Ohms ±1% 25W wirewound chassis mount resistor from the Metal-Mite®89 series, designed for high-power applications requiring precision and thermal stability. This part is classified as obsolete, making substitute components necessary for new designs and ongoing production requirements. The part features aluminum housing with flanged mounting and solder lug terminations, suitable for applications operating across -55°C to 275°C.

Substiute Parts

825F500

OhmiteIn Stock: 878825F500 Datasheet

Current PartRFQ

825F500E

OhmiteIn Stock: 1175825F500E Datasheet

DirectRFQ

RH025500R0FC02

Vishay DaleIn Stock: 1134RH025500R0FC02 Datasheet

DirectRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution for the 825F500 is determined by strict equivalence across the following critical parameters:

• Resistance value: 500 Ohms
• Tolerance: ±1%
• Power rating: 25W
• Composition: Wirewound
• Temperature coefficient: ±20ppm/°C
• Mounting configuration: Flanged chassis mount with solder lugs
• Physical dimensions: Compatible footprint (1.062" L × 1.094" W maximum)
• Housing material: Aluminum

Two substitute parts meet these criteria: the Ohmite 825F500E (direct manufacturer variant) and the Vishay Dale RH025500R0FC02 (cross-manufacturer equivalent). Both maintain identical electrical specifications and mechanical compatibility with the original part.

Parameter Comparison

Engineering Selection Recommendations

Ohmite 825F500E is the primary substitute for the obsolete 825F500. Both parts are from the same manufacturer and Metal-Mite®89 series, ensuring design continuity. The 825F500E maintains identical electrical and mechanical specifications while offering active product status and ROHS3 compliance, making it suitable for applications with regulatory requirements.

Vishay Dale RH025500R0FC02 serves as a cross-manufacturer alternative when Ohmite parts are unavailable. This part maintains all critical electrical parameters and mechanical compatibility. The operating temperature range is limited to -55°C to 250°C compared to 275°C for the Ohmite variants, which may affect suitability for high-temperature applications. The RH025500R0FC02 is REACH Affected, requiring compliance verification for specific end-use applications.

Selection between the two substitutes depends on application temperature requirements, regulatory compliance mandates, and supply chain considerations.

Frequently Asked Questions (FAQ)

Q: Can the 825F500E directly replace the 825F500 in existing designs?

A: Yes. The 825F500E maintains identical resistance, tolerance, power rating, temperature coefficient, and physical dimensions. The primary difference is product status (active vs. obsolete) and improved RoHS3 compliance.

Q: What is the maximum operating temperature difference between substitutes?

A: The Ohmite 825F500 and 825F500E operate to 275°C, while the Vishay Dale RH025500R0FC02 operates to 250°C. Applications requiring operation above 250°C must use Ohmite variants.

Q: Are there packaging differences between substitutes?

A: Yes. The 825F500 ships in standard packaging, the 825F500E in trays, and the RH025500R0FC02 in bulk. Packaging does not affect electrical or mechanical performance.

Q: Does REACH compliance status affect component selection?

A: REACH Affected status (RH025500R0FC02) requires compliance verification based on end-use application and regional regulations. REACH Unaffected parts (Ohmite variants) have no such restrictions.

Q: Are dimensional tolerances identical across all three parts?

A: Dimensions are equivalent within standard manufacturing tolerances. The 825F500 and 825F500E are 1.062" L × 1.094" W. The RH025500R0FC02 is 1.062" L × 1.080" W, representing a negligible difference suitable for standard PCB layouts.