Equivalent & Substitute Parts for Ohmite 850F10R

Part Overview

The Ohmite 850F10R is a 10 Ohms ±1% 50W wirewound chassis mount resistor from the Metal-Mite®89 series, designed for high-power applications requiring precision resistance and thermal stability. This part is classified as obsolete, making identification of suitable alternatives essential for ongoing production support and system maintenance. Substitute parts must maintain electrical performance across the specified operating temperature range while meeting mechanical mounting requirements.

Substiute Parts

850F10R

OhmiteIn Stock: 1778850F10R Datasheet

Current PartRFQ

850F10RE

OhmiteIn Stock: 1670850F10RE Datasheet

DirectRFQ

RH05010R00FC02

Vishay DaleIn Stock: 940RH05010R00FC02 Datasheet

DirectRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution eligibility for the 850F10R is determined by strict equivalence across core electrical and mechanical parameters. The following criteria establish valid substitutes:

Electrical Equivalence Requirements:

• Resistance value: 10 Ohms (exact match)
• Tolerance: ±1% (exact match)
• Power rating: 50W (exact match)
• Composition: Wirewound (exact match)
• Temperature coefficient: ±20ppm/°C (exact match)

Mechanical Compatibility Requirements:

• Housing type: Aluminum (exact match)
• Mounting feature: Flanges (exact match)
• Lead style: Solder Lugs (exact match)
• Package type: Axial, Box (exact match)

Identified Substitutes:

1. 850F10RE (Ohmite) – Direct manufacturer equivalent with identical electrical and mechanical specifications. Product status changed from obsolete to active.

2. RH05010R00FC02 (Vishay Dale) – Cross-manufacturer substitute meeting all core electrical parameters and mechanical mounting requirements. Minor dimensional variations within acceptable tolerance for chassis mount applications.

Parameter Comparison

Engineering Selection Recommendations

850F10RE (Ohmite) is the primary substitute for the obsolete 850F10R. Both parts are manufactured by Ohmite with identical electrical and mechanical specifications. The 850F10RE maintains active product status and achieves ROHS3 compliance, making it suitable for applications requiring regulatory adherence. This part represents a direct replacement with no design modifications required.

RH05010R00FC02 (Vishay Dale) serves as a secondary cross-manufacturer substitute. All core electrical parameters match the original specification. The operating temperature range extends to 250°C (versus 275°C for the original), which may limit applicability in extreme high-temperature environments. Dimensional variations are minor and compatible with standard chassis mount installations. This part remains RoHS non-compliant and is subject to REACH regulations.

Selection between the two substitutes depends on regulatory requirements and maximum operating temperature constraints of the application.

Frequently Asked Questions (FAQ)

Q: Can the 850F10RE directly replace the 850F10R without circuit modifications?

A: Yes. The 850F10RE is electrically and mechanically identical to the 850F10R. No circuit design changes are required for substitution.

Q: What is the significance of the operating temperature difference between 850F10R/850F10RE and RH05010R00FC02?

A: The RH05010R00FC02 operates to a maximum of 250°C, while the original parts operate to 275°C. Applications requiring sustained operation above 250°C must use the Ohmite substitute (850F10RE) to maintain specification compliance.

Q: Are there mechanical compatibility concerns when substituting the RH05010R00FC02?

A: Dimensional variations between the RH05010R00FC02 and the original part are minor (approximately 0.03 inches in length and height). Standard chassis mount installations accommodate these tolerances without modification.

Q: Which substitute is recommended for new designs?

A: The 850F10RE is recommended for new designs due to active product status and ROHS3 compliance. The RH05010R00FC02 is suitable where cross-manufacturer sourcing is required or as a secondary supply option.

Q: Do the substitutes maintain the same thermal and electrical performance?

A: Yes. Both substitutes maintain the ±20ppm/°C temperature coefficient and ±1% tolerance specification. Thermal performance in chassis mount applications remains equivalent across all three parts within their respective operating temperature ranges.