Ohmite 810F300E Equivalent & Substitute Parts

Part Overview

The Ohmite 810F300E is a 10W, 300 Ohms ±1% wirewound chassis mount resistor from the Metal-Mite®89 series. This component is designed for applications requiring precision resistive elements with high power dissipation capability in a compact form factor. The part maintains Active product status with full RoHS compliance and unlimited moisture sensitivity rating (MSL 1). Substitute parts are identified when original inventory is unavailable or when design requirements permit higher power ratings or extended operating temperature ranges while maintaining core electrical specifications.

Substiute Parts

810F300E

OhmiteIn Stock: 871810F300E Datasheet

Current PartRFQ

RH010300R0FE02

Vishay DaleIn Stock: 940RH010300R0FE02 Datasheet

DirectRFQ

TMC010300R0FE02

Vishay DaleIn Stock: 1163TMC010300R0FE02 Datasheet

UpgradeRFQ

UAL10-300RF8

RiedonIn Stock: 1337UAL10-300RF8 Datasheet

UpgradeRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution eligibility for the 810F300E is determined by the following mandatory parameters:

• Resistance value: 300 Ohms (exact match required)
• Tolerance: ±1% (exact match required)
• Composition: Wirewound (exact match required)
• Mounting feature: Flanges (exact match required)
• Lead style: Solder Lugs (exact match required)
• Housing type: Aluminum (exact match required)

Substitute parts may vary in power rating (equal to or greater than 10W), operating temperature range (equal to or greater than the original), and series designation. All identified substitutes meet the core electrical and mechanical compatibility requirements for direct replacement in the 810F300E application space.

Parameter Comparison

Engineering Selection Recommendations

All three substitute parts maintain Active product status and full RoHS3 compliance, meeting regulatory requirements equivalent to or exceeding the original 810F300E specification.

RH010300R0FE02 and TMC010300R0FE02 (Vishay Dale RH and TMC series) provide increased power rating (12.5W versus 10W) with identical temperature coefficient and extended operating temperature range (-55°C to 250°C). Both parts feature moisture-resistant construction and are dimensionally similar to the original, with slightly reduced height and length. These parts are suitable for applications where higher thermal margin or extended temperature operation is beneficial.

UAL10-300RF8 (Riedon UAL series) maintains the original 10W power rating with extended operating temperature range (-55°C to 275°C). This part includes additional features: current sense capability, flame proof construction, pulse withstanding, and safety certifications. Dimensional compatibility is equivalent to the original part. MSL rating remains at 1 (Unlimited), matching the original specification.

Selection between substitutes depends on application-specific requirements for power dissipation margin, operating temperature range, and feature set. All parts are electrically and mechanically compatible with the 810F300E footprint and circuit function.

Frequently Asked Questions (FAQ)

Q: Can RH010300R0FE02 or TMC010300R0FE02 be used as direct replacements for 810F300E?

A: Yes. Both Vishay Dale parts meet all mandatory substitution criteria: 300 Ohms ±1% resistance, wirewound composition, aluminum housing, flanged mounting, and solder lug leads. The increased 12.5W power rating provides additional thermal margin without affecting circuit operation. Dimensional differences are minimal and do not impact PCB layout compatibility.

Q: What is the difference between RH010300R0FE02 and TMC010300R0FE02?

A: Both parts are electrically and mechanically identical (300 Ohms ±1%, 12.5W, -55°C to 250°C operating range, identical dimensions). The difference is series designation: RH series versus TMC series. Selection between these parts depends on manufacturer availability and inventory status.

Q: Is UAL10-300RF8 suitable for high-temperature applications?

A: UAL10-300RF8 supports operating temperatures up to 275°C, compared to the 250°C maximum of the Vishay Dale substitutes. This extended range makes it suitable for applications requiring higher temperature operation. The 10W power rating matches the original 810F300E specification.

Q: Are there physical mounting differences between the 810F300E and substitute parts?

A: All parts feature flanged mounting with solder lugs and aluminum housing. Dimensional variations are minor: substitute parts are slightly smaller in length and height. These differences do not affect mounting compatibility or circuit function. Verify PCB layout clearances if space constraints are critical.

Q: Do all substitute parts maintain RoHS compliance?

A: Yes. All three substitute parts are ROHS3 compliant, meeting or exceeding the RoHS compliance status of the original 810F300E.

Q: What does MSL rating mean for these resistors?

A: MSL (Moisture Sensitivity Level) indicates the component's sensitivity to moisture during storage and handling. The 810F300E and UAL10-300RF8 both carry MSL 1 (Unlimited), indicating no moisture sensitivity restrictions. Vishay Dale parts carry "Not Applicable" MSL rating, indicating no moisture sensitivity concern for these wirewound resistor designs.