Ohmite 805F250 Equivalent & Substitute Parts

Part Overview

The Ohmite 805F250 is a 250 Ohms ±1% 5W wirewound chassis mount resistor from the Metal-Mite®89 series, designed for applications requiring precision resistance with high power dissipation capability. The part features aluminum housing with flanged mounting and solder lug termination, suitable for chassis-mounted applications in industrial and electronic equipment.

This part is classified as obsolete. Identifying equivalent and substitute parts is necessary to maintain design continuity, ensure supply chain availability, and support ongoing production or repair requirements for systems utilizing this component.

Substiute Parts

805F250

OhmiteIn Stock: 852805F250 Datasheet

Current PartRFQ

805F250E

ARCOLIn Stock: 728805F250E Datasheet

DirectRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution of the Ohmite 805F250 is based on strict equivalence of the following critical parameters:

• Resistance value: 250 Ohms
• Tolerance: ±1%
• Power rating: 5W
• Composition: Wirewound
• Temperature coefficient: ±20ppm/°C
• Housing material: Aluminum
• Mounting feature: Flanges
• Lead style: Solder Lugs
• Package configuration: Axial, Box

The ARCOL 805F250E meets all these criteria and is classified as a direct manufacturer equivalent within the Metal-Mite®89 series. Physical dimensions show minor variations within acceptable tolerances for chassis-mounted applications. The substitute part maintains functional and electrical equivalence while offering improved compliance status.

Parameter Comparison

Engineering Selection Recommendations

The ARCOL 805F250E is the direct equivalent substitute for the Ohmite 805F250. Both parts share identical electrical specifications and mechanical mounting characteristics within the Metal-Mite®89 series.

Selection of the ARCOL 805F250E is supported by:

• Active product status, ensuring ongoing availability and supply chain support
• RoHS compliance, meeting current environmental and regulatory requirements
• Moisture sensitivity level classification (MSL 1 - Unlimited), indicating robust handling characteristics
• Identical electrical performance parameters across all critical specifications
• Minor dimensional variations that remain compatible with existing chassis mounting designs

The transition from the obsolete Ohmite 805F250 to the active ARCOL 805F250E presents no functional or performance degradation while improving compliance posture and supply reliability.

Frequently Asked Questions (FAQ)

Q: Can the ARCOL 805F250E be used as a direct replacement for the Ohmite 805F250?

A: Yes. Both parts are electrically and mechanically equivalent within the Metal-Mite®89 series, sharing identical resistance value, tolerance, power rating, temperature coefficient, and mounting configuration.

Q: What are the physical dimension differences between these parts?

A: The Ohmite 805F250 measures 0.600" L x 0.646" W (15.24mm x 16.41mm) with a maximum seated height of 0.330" (8.38mm). The ARCOL 805F250E measures 0.626" L x 0.650" W (15.90mm x 16.50mm) with a maximum seated height of 0.346" (8.80mm). These variations are within acceptable tolerances for chassis-mounted applications and do not affect functional compatibility.

Q: What is the significance of the RoHS compliance difference?

A: The Ohmite 805F250 is RoHS non-compliant, while the ARCOL 805F250E is RoHS compliant. For new designs or applications subject to RoHS regulations, the ARCOL 805F250E is the appropriate selection. For legacy system repairs where RoHS compliance is not a requirement, either part functions identically.

Q: Are there any temperature operating range limitations with the substitute part?

A: The Ohmite 805F250 specifies an operating temperature range of -55°C ~ 275°C. The ARCOL 805F250E does not provide an explicit operating temperature range in the available data. Both parts share identical temperature coefficient specifications (±20ppm/°C), indicating equivalent thermal performance characteristics.

Q: What packaging options are available?

A: The Ohmite 805F250 is available in standard packaging. The ARCOL 805F250E is supplied in bulk packaging, which may affect procurement quantities and handling procedures depending on application requirements.