Ohmite 810F250 Wirewound Chassis Mount Resistor - Equivalent & Substitute Parts

Part Overview

The Ohmite 810F250 is a 250 Ohms ±1% 10W wirewound chassis mount resistor from the Metal-Mite®89 series. This component is classified as obsolete, making identification of suitable substitutes essential for ongoing system support and new design implementations. The 810F250E represents the direct successor within the same product line, offering identical electrical and mechanical specifications with improved compliance status.

Substiute Parts

810F250

OhmiteIn Stock: 742810F250 Datasheet

Current PartRFQ

810F250E

OhmiteIn Stock: 1197810F250E Datasheet

DirectRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution eligibility for the 810F250 is determined by strict equivalence across the following critical parameters:

• Resistance value: 250 Ohms
• Tolerance: ±1%
• Power rating: 10W
• Composition: Wirewound
• Temperature coefficient: ±20ppm/°C
• Operating temperature range: -55°C to 275°C
• Housing material: Aluminum
• Mounting configuration: Flanges with solder lugs
• Physical dimensions: 0.750" L x 0.812" W, 0.400" height maximum

The 810F250E qualifies as a direct substitute based on complete alignment with all electrical and mechanical parameters. The primary distinction lies in product status and regulatory compliance, not functional performance.

Parameter Comparison

Engineering Selection Recommendations

The 810F250E is the appropriate substitute for the obsolete 810F250. Both components deliver identical electrical performance and mechanical compatibility. The 810F250E offers the advantage of active product status, ensuring long-term availability and supply chain continuity. Additionally, the 810F250E meets ROHS3 compliance requirements, addressing regulatory mandates for new designs and systems subject to environmental standards. The tray packaging of the 810F250E supports efficient handling and inventory management compared to standard packaging.

For applications where RoHS non-compliance is not a constraint and existing inventory of 810F250 units remains available, the original part may continue to function. However, for new procurement and design implementations, the 810F250E is the recommended selection.

Frequently Asked Questions (FAQ)

Q: Are the 810F250 and 810F250E electrically identical?

A: Yes. Both components share identical resistance (250 Ohms), tolerance (±1%), power rating (10W), temperature coefficient (±20ppm/°C), and operating temperature range (-55°C to 275°C). Electrical performance is equivalent.

Q: Can the 810F250E be used as a direct replacement in existing assemblies?

A: Yes. The 810F250E maintains identical physical dimensions (0.750" L x 0.812" W, 0.400" height), mounting configuration (flanges with solder lugs), and package type (Axial, Box). Direct substitution is mechanically and electrically compatible.

Q: What is the primary difference between these two parts?

A: The 810F250 is obsolete, while the 810F250E is active. The 810F250E also meets ROHS3 compliance, whereas the 810F250 is RoHS non-compliant. Packaging differs: 810F250E uses tray packaging.

Q: Why should I transition from 810F250 to 810F250E?

A: The 810F250 is obsolete and subject to supply discontinuation. The 810F250E ensures ongoing availability, regulatory compliance, and supply chain reliability for current and future applications.

Q: Are there any performance differences in temperature stability?

A: No. Both components specify an identical temperature coefficient of ±20ppm/°C and operate across the same temperature range (-55°C to 275°C).

Q: Does packaging affect component performance?

A: No. Tray packaging (810F250E) versus standard packaging (810F250) affects handling and storage logistics only, not electrical or mechanical performance.