Ohmite 85F20R Equivalent & Substitute Parts

Part Overview

The Ohmite 85F20R is a 20 Ohm, ±1% tolerance, 5W axial wirewound through-hole resistor from the Acrasil® 80 series. This component is classified as Active product status and is currently in stock with 988 units available. The 85F20R is designed for applications requiring precision resistive elements with wirewound construction and tight tolerance specifications. Equivalent and substitute parts are identified to provide procurement flexibility, support supply chain continuity, and accommodate specific application requirements such as RoHS compliance or alternative packaging formats.

Substiute Parts

85F20R

OhmiteIn Stock: 100685F20R Datasheet

Current PartRFQ

45F20RE

OhmiteIn Stock: 88945F20RE Datasheet

Parametric EquivalentRFQ

RS00520R00FS73

Vishay DaleIn Stock: 1469RS00520R00FS73 Datasheet

MFR RecommendedRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitute parts for the Ohmite 85F20R are qualified based on the following critical parameters that determine functional equivalence:

• Resistance value: 20 Ohms (exact match required)
• Tolerance: ±1% (exact match required)
• Power rating: 5W (exact match required)
• Composition: Wirewound (exact match required)
• Package type: Axial (exact match required)
• Temperature coefficient: ±20ppm/°C (exact match required)
• Number of terminations: 2 (exact match required)

All identified substitute parts meet these core electrical and mechanical parameters. Variations in physical dimensions, operating temperature ranges, RoHS compliance status, and packaging formats are secondary considerations that do not affect functional substitution within the specified parameter set.

Parameter Comparison

Engineering Selection Recommendations

Ohmite 45F20RE is a parametric equivalent substitute with identical electrical specifications and physical dimensions to the 85F20R. The 45F20RE offers RoHS Compliant status and an extended operating temperature range of -55°C to 275°C, making it suitable for applications with regulatory compliance requirements. This part is available in Bulk packaging with 878 units in stock.

Vishay Dale RS00520R00FS73 is a manufacturer-recommended substitute that meets all core electrical parameters. The RS series component features moisture-resistant construction and operates across -65°C to 250°C. Physical dimensions are slightly reduced (0.312" Dia x 0.875" L versus 0.343" Dia x 0.937" L), which may be relevant for space-constrained applications. This part is supplied in Cut Tape (CT) packaging with 1383 units available. RoHS status is non-compliant, consistent with the original 85F20R specification.

Selection between these substitutes should be based on specific application requirements regarding RoHS compliance, operating temperature range, physical space constraints, and packaging format preferences.

Frequently Asked Questions (FAQ)

Q: Can the Ohmite 45F20RE be used as a direct replacement for the 85F20R?

A: Yes. Both parts share identical resistance (20 Ohms), tolerance (±1%), power rating (5W), composition (wirewound), package type (axial), temperature coefficient (±20ppm/°C), and termination count (2). Physical dimensions are also identical. The primary difference is RoHS compliance status and operating temperature range specification.

Q: What is the significance of the physical dimension difference in the Vishay Dale RS00520R00FS73?

A: The RS00520R00FS73 has slightly smaller dimensions (0.312" Dia x 0.875" L) compared to the 85F20R (0.343" Dia x 0.937" L). This dimensional variation may affect board layout and mechanical fit. Verify clearance and mounting requirements before substitution in space-constrained designs.

Q: Does the moisture-resistant feature of the RS00520R00FS73 affect substitution compatibility?

A: Moisture resistance is an additional feature that does not compromise functional equivalence. The RS00520R00FS73 remains electrically and mechanically compatible with applications designed for the 85F20R. This feature may provide enhanced reliability in humid or moisture-prone environments.

Q: Are there packaging format considerations when selecting a substitute?

A: Yes. The 85F20R and 45F20RE are supplied in Bulk packaging, while the RS00520R00FS73 is supplied in Cut Tape (CT) format. Packaging selection may impact procurement processes, handling, and assembly automation compatibility. Verify packaging requirements with your supply chain and assembly operations.

Q: How do operating temperature ranges affect part selection?

A: The 45F20RE specifies -55°C to 275°C, the RS00520R00FS73 specifies -65°C to 250°C, and the 85F20R does not specify an operating temperature range. If your application requires operation outside the specified ranges of the substitutes, verify compatibility with the original part's undocumented thermal limits or consult the manufacturer.