810F300 Equivalent & Substitute Parts

Part Overview

The Ohmite 810F300 is a 300 Ohms ±1% 10W wirewound chassis mount resistor from the Metal-Mite®89 series. This component is classified as obsolete, making equivalent substitute parts necessary for ongoing design support and procurement. The part features aluminum housing with flanged mounting and solder lug termination, suitable for applications requiring precision resistance with moderate power dissipation in compact form factors.

Substiute Parts

810F300

OhmiteIn Stock: 776810F300 Datasheet

Current PartRFQ

RH010300R0FC02

Vishay DaleIn Stock: 1074RH010300R0FC02 Datasheet

DirectRFQ

UAL10-300RF8

RiedonIn Stock: 1337UAL10-300RF8 Datasheet

DirectRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitute parts for the 810F300 are qualified based on the following electrical and mechanical parameters:

Primary Matching Criteria:

• Resistance value: 300 Ohms
• Tolerance: ±1%
• Composition: Wirewound
• Temperature Coefficient: ±20ppm/°C
• Housing: Aluminum with flanged mounting
• Lead termination: Solder lugs
• Package configuration: Axial, Box

Secondary Compatibility Parameters:

• Power rating: Equal to or greater than 10W
• Operating temperature range: Must encompass or match -55°C ~ 275°C
• Physical dimensions: Comparable footprint for chassis mount applications

Two substitute parts meet these criteria with varying compliance and availability profiles.

Parameter Comparison

Engineering Selection Recommendations

RH010300R0FC02 (Vishay Dale RH Series)

This substitute provides a 12.5W power rating, exceeding the 10W requirement of the original 810F300. Electrical parameters remain identical across resistance, tolerance, and temperature coefficient. The operating temperature range extends to 250°C, which is 25°C lower than the original specification. This part maintains RoHS non-compliant status consistent with the obsolete original. Moisture-resistant coating is included as an additional feature. This option is suitable for applications where the reduced upper temperature limit does not conflict with system requirements.

UAL10-300RF8 (Riedon UAL Series)

This substitute matches the 810F300 across all primary electrical specifications: 10W power rating, ±1% tolerance, ±20ppm/°C temperature coefficient, and -55°C ~ 275°C operating range. The part achieves ROHS3 compliance, providing regulatory advantage over the original obsolete component. Additional features include current sense capability, flame proof construction, pulse withstanding, and safety certifications. Physical dimensions are comparable to the original. This option is recommended for applications requiring modern compliance standards and extended component lifecycle support.

Frequently Asked Questions (FAQ)

Q: Can RH010300R0FC02 be used as a direct replacement for 810F300?

A: RH010300R0FC02 is electrically compatible with matching resistance, tolerance, and temperature coefficient. The 12.5W power rating provides margin above the 10W requirement. However, the maximum operating temperature is 250°C versus 275°C for the original. Substitution is valid only if circuit operation does not require temperatures above 250°C.

Q: What are the compliance differences between the substitute parts?

A: UAL10-300RF8 is ROHS3 compliant with MSL rating of 1 (Unlimited), meeting modern regulatory requirements. RH010300R0FC02 maintains RoHS non-compliant status. For new designs or applications with compliance mandates, UAL10-300RF8 is the preferred selection.

Q: Are physical dimensions identical between the main part and substitutes?

A: All three parts share comparable chassis mount footprints with flanged aluminum housing and solder lug termination. Dimensional variations are minor (length 0.750"-0.752", width 0.799"-0.812", height 0.400"-0.417"). These differences do not affect mounting compatibility in standard chassis mount applications.

Q: Which substitute should be selected for new production designs?

A: UAL10-300RF8 is recommended for new designs due to active product status, ROHS3 compliance, and extended operating temperature range matching the original specification. RH010300R0FC02 is suitable for legacy system support where compliance requirements are not applicable.

Q: Do the substitute parts maintain the same electrical performance characteristics?

A: Yes. Both substitutes maintain ±1% tolerance, ±20ppm/°C temperature coefficient, and wirewound composition identical to the 810F300. Electrical performance in precision applications remains equivalent.