Equivalent & Substitute Parts for Ohmite 810F4K5

Part Overview

The Ohmite 810F4K5 is a 4.5 kOhms ±1% 10W wirewound chassis mount resistor designed for high-power applications requiring precision and thermal stability. This part is classified as obsolete, making identification of suitable alternatives essential for ongoing system support and new design implementations. The Metal-Mite®89 series provides robust performance across industrial temperature ranges, and equivalent substitutes maintain identical electrical and mechanical specifications while offering improved availability and compliance status.

Substiute Parts

810F4K5

OhmiteIn Stock: 1001810F4K5 Datasheet

Current PartRFQ

810F4K5E

OhmiteIn Stock: 1032810F4K5E Datasheet

DirectRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution for the 810F4K5 is based on maintaining electrical equivalence and mechanical compatibility. The primary substitute, Ohmite 810F4K5E, satisfies all substitution criteria through identical specifications across the following key parameters:

• Resistance value and tolerance (4.5 kOhms ±1%)
• Power dissipation capability (10W)
• Thermal characteristics (±20ppm/°C temperature coefficient, -55°C to 275°C operating range)
• Physical form factor (0.750" × 0.812" × 0.400" aluminum chassis mount with flanges)
• Lead configuration (solder lugs for direct PCB integration)
• Composition and construction method (wirewound)

The 810F4K5E maintains full electrical and mechanical interchangeability with the original part while offering improved product status and regulatory compliance.

Parameter Comparison

Engineering Selection Recommendations

The 810F4K5E is the direct equivalent substitute for the obsolete 810F4K5. Selection of the 810F4K5E is supported by the following factors:

• Full electrical and mechanical equivalence across all specified parameters
• Active product status ensuring long-term availability and supply chain continuity
• ROHS3 compliance, meeting current regulatory requirements for new designs and manufacturing
• Identical form factor and lead configuration enabling direct PCB substitution without layout modifications
• Tray packaging format suitable for automated assembly processes

For applications requiring the 4.5 kOhms ±1% 10W wirewound chassis mount resistor specification, the 810F4K5E provides complete functional replacement with improved compliance and availability status.

Frequently Asked Questions (FAQ)

Q: Can the 810F4K5E be used as a direct replacement for the 810F4K5 without PCB modifications?

A: Yes. The 810F4K5E maintains identical physical dimensions, lead configuration, and mounting features. Direct substitution is possible without PCB layout changes.

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

A: The 810F4K5E is the active production equivalent of the obsolete 810F4K5. Both parts are electrically and mechanically identical. The 810F4K5E offers ROHS3 compliance and improved supply availability.

Q: Are there any packaging considerations when switching from 810F4K5 to 810F4K5E?

A: The 810F4K5E is supplied in tray packaging, whereas the 810F4K5 uses standard box packaging. This difference affects handling and automated assembly processes but does not impact component performance or compatibility.

Q: What electrical parameters must remain constant for substitution?

A: Substitution requires matching resistance value (4.5 kOhms), tolerance (±1%), power rating (10W), temperature coefficient (±20ppm/°C), and operating temperature range (-55°C to 275°C).

Q: Is the 810F4K5E suitable for high-temperature applications?

A: Yes. The 810F4K5E operates across the full -55°C to 275°C temperature range with ±20ppm/°C temperature coefficient stability, maintaining specification across industrial and high-temperature environments.

Q: Does RoHS compliance affect electrical performance?

A: No. ROHS3 compliance of the 810F4K5E reflects manufacturing process changes only. Electrical and thermal performance remain identical to the non-compliant 810F4K5.