Equivalent & Substitute Parts for Ohmite 805F200

Part Overview

The Ohmite 805F200 is a 200 Ohms ±1% 5W wirewound chassis mount resistor from the Metal-Mite®89 series. This component is classified as obsolete, making it necessary to identify functionally equivalent alternatives for new designs and ongoing production requirements. 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

805F200

OhmiteIn Stock: 814805F200 Datasheet

Current PartRFQ

UAL25-200RF8

RiedonIn Stock: 1559UAL25-200RF8 Datasheet

MFR RecommendedRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution of the Ohmite 805F200 is based on electrical and mechanical parameter equivalence. The primary substitute, Riedon UAL25-200RF8, maintains identical electrical specifications across resistance value, tolerance, temperature coefficient, and operating temperature range. Both components utilize wirewound construction with aluminum housing and flanged mounting with solder lug termination.

The key substitution criteria are:

• Resistance: 200 Ohms (exact match)
• Tolerance: ±1% (exact match)
• Composition: Wirewound (exact match)
• Temperature Coefficient: ±20ppm/°C (exact match)
• Operating Temperature: -55°C to 275°C (exact match)
• Housing and Mounting: Aluminum with flanges and solder lugs (exact match)

The Riedon UAL25-200RF8 provides enhanced power rating (25W versus 5W), which represents a design upgrade path for applications requiring higher power dissipation capability while maintaining all other electrical and mechanical characteristics.

Parameter Comparison

Engineering Selection Recommendations

The Riedon UAL25-200RF8 is the qualified substitute for the Ohmite 805F200. Selection of this alternative is based on:

• Electrical equivalence across all specified parameters (resistance, tolerance, temperature coefficient, operating temperature range)
• Mechanical compatibility (identical housing type, mounting configuration, and lead style)
• Active product status ensuring long-term availability and supply chain continuity
• ROHS3 compliance, addressing regulatory requirements for new designs and manufacturing environments where RoHS compliance is mandated

The increased power rating of the Riedon component (25W versus 5W) provides design margin and does not introduce incompatibility. Physical dimensions differ slightly due to the higher power rating; verification of mechanical fit within the target application is required.

Frequently Asked Questions (FAQ)

Q: Can the Riedon UAL25-200RF8 directly replace the Ohmite 805F200 in existing designs?

A: Electrical substitution is direct due to identical resistance, tolerance, temperature coefficient, and operating temperature specifications. Mechanical verification is necessary because the Riedon component has larger physical dimensions (1.063" L x 1.079" W versus 0.600" L x 0.646" W). PCB layout and enclosure space must accommodate the larger footprint.

Q: What is the significance of the higher power rating on the Riedon part?

A: The 25W rating on the Riedon UAL25-200RF8 versus 5W on the Ohmite 805F200 indicates greater thermal dissipation capability. This does not affect electrical performance in applications where the original 5W rating was sufficient. For applications operating near the 5W limit, the higher rating provides additional thermal margin.

Q: Are there compliance differences between these parts?

A: The Ohmite 805F200 is RoHS non-compliant, while the Riedon UAL25-200RF8 is ROHS3 compliant. For new designs or manufacturing environments subject to RoHS regulations, the Riedon component is the required selection.

Q: What packaging options are available for the Riedon substitute?

A: The Riedon UAL25-200RF8 is supplied in bulk packaging. The Ohmite 805F200 packaging specification was not detailed in the available data.

Q: Are there any electrical performance differences in temperature stability?

A: Both components share identical temperature coefficient specifications (±20ppm/°C) and operating temperature range (-55°C to 275°C), ensuring equivalent temperature stability performance across the full operating envelope.