Equivalent & Substitute Parts for 850F5R0

Part Overview

The 850F5R0 is a 5 Ohms ±1% 50W wirewound chassis mount resistor manufactured by Ohmite, part of 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 in high-power environments.

Substiute Parts

850F5R0

OhmiteIn Stock: 1123850F5R0 Datasheet

Current PartRFQ

850F5R0E

OhmiteIn Stock: 812850F5R0E Datasheet

DirectRFQ

RH0505R000FC02

Vishay DaleIn Stock: 1231RH0505R000FC02 Datasheet

DirectRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitute parts for the 850F5R0 are qualified based on the following electrical and mechanical parameters:

• Resistance value: 5 Ohms
• Tolerance: ±1%
• Power rating: 50W
• Composition: Wirewound
• Temperature coefficient: ±50ppm/°C
• Housing type: Aluminum
• Mounting feature: Flanges
• Lead style: Solder Lugs
• Package type: Axial, Box

The identified substitute parts maintain these core specifications. Variations in operating temperature range, physical dimensions within tolerance, and compliance certifications do not disqualify substitution eligibility when the primary electrical and mechanical parameters align.

Parameter Comparison

Engineering Selection Recommendations

For applications currently using the obsolete 850F5R0, the 850F5R0E (Ohmite) is the primary substitute. This part maintains identical electrical specifications and mechanical form factor while offering active product status and ROHS3 compliance, supporting modern regulatory requirements.

The RH0505R000FC02 (Vishay Dale) serves as an alternative substitute with equivalent electrical performance. This part operates within a reduced temperature range (-55°C ~ 250°C) compared to the original specification (-55°C ~ 275°C). Selection of this part requires confirmation that the application's maximum operating temperature does not exceed 250°C. The RH0505R000FC02 includes moisture-resistant features and maintains RoHS non-compliant status consistent with legacy applications.

Physical dimensions vary slightly between manufacturers. The 850F5R0E maintains the original dimensions (1.938" L x 1.156" W, 0.620" height), while the RH0505R000FC02 presents minor variations (1.968" L x 1.140" W, 0.625" height). Verification of mechanical fit within the application's mounting envelope is required before final selection.

Frequently Asked Questions (FAQ)

Q: Can the 850F5R0E directly replace the 850F5R0 in existing designs?

A: Yes. The 850F5R0E maintains identical electrical specifications (5 Ohms ±1%, 50W, ±50ppm/°C) and mechanical form factor (aluminum housing, flanged mounting, solder lugs). Physical dimensions are identical, supporting direct substitution in existing PCB layouts and mechanical assemblies.

Q: What is the primary difference between the 850F5R0E and RH0505R000FC02?

A: Both parts meet the core electrical requirements. The 850F5R0E operates to 275°C, while the RH0505R000FC02 operates to 250°C. The RH0505R000FC02 includes moisture-resistant coating. Physical dimensions differ slightly. Selection depends on application temperature requirements and environmental exposure conditions.

Q: Does the RH0505R000FC02 fit the same mounting footprint as the 850F5R0?

A: The RH0505R000FC02 presents minor dimensional variations. Length is 1.968" versus 1.938", width is 1.140" versus 1.156", and height is 0.625" versus 0.620". These differences are within typical manufacturing tolerances but require verification against specific mechanical constraints in your application.

Q: Are there compliance considerations when selecting a substitute?

A: The 850F5R0E is ROHS3 compliant, supporting modern regulatory environments. The RH0505R000FC02 is RoHS non-compliant. If your application or end market requires RoHS compliance, the 850F5R0E is the appropriate selection.

Q: Can I use the RH0505R000FC02 in applications operating above 250°C?

A: No. The RH0505R000FC02 is rated for -55°C ~ 250°C operation. Applications requiring operation above 250°C must use the 850F5R0 or 850F5R0E, both rated to 275°C.