Ohmite 810F50R Wirewound Chassis Mount Resistor – Equivalent & Substitute Parts

Part Overview

The Ohmite 810F50R is a 50 Ohm ±1% wirewound chassis mount resistor rated for 10W continuous power dissipation. This component is classified as obsolete, making direct equivalents and functional substitutes necessary for ongoing system support and new designs. The Metal-Mite®89 series resistor features aluminum housing with flanged mounting and solder lug termination, suitable for high-power applications requiring precision resistance values and thermal stability across extended temperature ranges.

Substiute Parts

810F50R

OhmiteIn Stock: 762810F50R Datasheet

Current PartRFQ

810F50RE

OhmiteIn Stock: 791810F50RE Datasheet

DirectRFQ

RH01050R00FC02

Vishay DaleIn Stock: 1196RH01050R00FC02 Datasheet

DirectRFQ

RH01050R00FE02

Vishay DaleIn Stock: 1350RH01050R00FE02 Datasheet

DirectRFQ

TMC01050R00FE02

Vishay DaleIn Stock: 960TMC01050R00FE02 Datasheet

DirectRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution eligibility is determined by the following critical parameters:

• Resistance Value & Tolerance: All substitutes must maintain 50 Ohms ±1%
• Composition & Temperature Coefficient: Wirewound construction with ±20ppm/°C thermal stability
• Power Rating: Minimum 10W; higher ratings (12.5W) are acceptable as they provide additional thermal margin
• Mounting & Housing: Aluminum chassis mount with flanged configuration and solder lug termination
• Physical Compatibility: Dimensions must accommodate existing PCB or chassis mounting holes
• Operating Temperature: Minimum -55°C to 250°C; the original -55°C to 275°C upper limit is not a substitution barrier for applications operating within 250°C

The substitute parts are grouped into two categories:

Category 1 – Direct Ohmite Equivalent: 810F50RE maintains identical electrical specifications and physical form factor with improved product status (Active vs. Obsolete) and RoHS3 compliance.

Category 2 – Vishay Dale Cross-Substitutes: RH01050R00FE02, RH01050R00FC02, and TMC01050R00FE02 provide functionally equivalent performance with higher power ratings (12.5W) and moisture-resistant construction. These parts accept the reduced upper operating temperature limit of 250°C in exchange for enhanced reliability features.

Parameter Comparison

Engineering Selection Recommendations

For Direct Replacement (Preferred): Select Ohmite 810F50RE when available. This part maintains identical electrical and mechanical specifications while offering Active product status and RoHS3 compliance. The transition from obsolete to active status ensures long-term supply chain continuity.

For Enhanced Thermal Performance: Select Vishay Dale RH01050R00FE02 or TMC01050R00FE02 when applications require higher power dissipation margins or moisture-resistant construction. Both parts provide 12.5W rating (25% power headroom above the original 10W specification) and are RoHS3 compliant. The 0.405" seated height represents a 0.005" increase; verify clearance in existing mechanical assemblies.

For Non-RoHS Applications: Vishay Dale RH01050R00FC02 is functionally equivalent to RH01050R00FE02 with identical electrical performance and moisture resistance. This part is RoHS non-compliant and suitable for legacy systems or applications where RoHS compliance is not required.

Operating Temperature Consideration: Applications requiring operation above 250°C must use Ohmite 810F50R or 810F50RE. Vishay Dale substitutes (RH and TMC series) are limited to 250°C maximum operating temperature.

Frequently Asked Questions (FAQ)

Q: Can I use RH01050R00FE02 as a direct drop-in replacement for 810F50R?

A: Yes, with mechanical verification. The RH01050R00FE02 maintains all critical electrical parameters (50 Ohms ±1%, ±20ppm/°C, wirewound construction). Physical dimensions differ slightly: the Vishay part is 0.800" wide (vs. 0.812") and 0.405" tall (vs. 0.400"). Confirm that existing mounting holes and clearances accommodate these minor variations.

Q: What is the advantage of the 12.5W Vishay Dale parts over the 10W Ohmite original?

A: The higher power rating provides thermal margin in applications approaching the 10W limit. At equivalent current levels, the 12.5W resistor operates at lower junction temperature, extending component life and improving reliability. This is particularly beneficial in high-ambient-temperature environments.

Q: Are the Vishay Dale RH and TMC series interchangeable with each other?

A: RH01050R00FE02 and TMC01050R00FE02 are electrically and mechanically identical. Both are RoHS3 compliant, rated 12.5W, and feature moisture-resistant construction. Selection between these two is based on availability and supply chain preference.

Q: Does the 250°C upper temperature limit of Vishay Dale parts affect my application?

A: Only if your system operates above 250°C. For applications with maximum operating temperatures at or below 250°C, the Vishay Dale substitutes are fully qualified. If sustained operation above 250°C is required, use Ohmite 810F50R or 810F50RE.

Q: What is the difference between RH01050R00FE02 and RH01050R00FC02?

A: Both parts are electrically and mechanically identical with 50 Ohms ±1%, 12.5W, and moisture-resistant aluminum construction. The primary difference is RoHS compliance: RH01050R00FE02 is RoHS3 compliant, while RH01050R00FC02 is RoHS non-compliant. Select based on regulatory requirements for your end application.

Q: Is packaging type a substitution factor?

A: Packaging (Tray vs. Bulk) affects handling, storage, and procurement logistics but does not impact electrical or mechanical performance. All listed substitutes are functionally equivalent regardless of packaging configuration.