Ohmite 81F2R0 Equivalent & Substitute Parts

Part Overview

The Ohmite 81F2R0 is a 2 Ohm ±1% 1W axial wirewound through-hole resistor from the Acrasil® 80 series. This component is currently active in production with 1122 pieces in stock. Equivalent and substitute parts are identified based on matching electrical specifications (resistance value, tolerance, power rating, temperature coefficient) and mechanical compatibility (axial package, through-hole termination). Alternative part numbers are necessary when the primary part is unavailable, when different packaging or compliance requirements are needed, or when sourcing from alternative manufacturers is required.

Substiute Parts

81F2R0

OhmiteIn Stock: 114981F2R0 Datasheet

Current PartRFQ

41F2R0E

OhmiteIn Stock: 104041F2R0E Datasheet

Parametric EquivalentRFQ

RS01A2R000FS70

Vishay DaleIn Stock: 2101RS01A2R000FS70 Datasheet

MFR RecommendedRFQ

41F2R0

OhmiteIn Stock: 117041F2R0 Datasheet

Parametric EquivalentRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitute parts for the 81F2R0 are grouped based on strict electrical and mechanical parameter matching. All identified substitutes maintain the core specifications: 2 Ohms resistance, ±1% tolerance, 1W power rating, wirewound composition, and axial through-hole package. The temperature coefficient of ±50ppm/°C is consistent across all parts. Substitution eligibility is determined by these parameters alone. Differences in series designation, packaging format (bulk vs. cut tape), RoHS compliance status, and physical dimensions within acceptable tolerances do not prevent substitution when electrical specifications are identical.

Parameter Comparison

Engineering Selection Recommendations

All three substitute parts (41F2R0E, RS01A2R000FS70, and 41F2R0) are electrically and mechanically equivalent to the 81F2R0 based on matching core parameters. Selection among these alternatives should be based on the following criteria:

RoHS Compliance Requirement: If RoHS compliance is mandated, the 41F2R0E is the only option, as it carries RoHS Compliant status. The 81F2R0, RS01A2R000FS70, and 41F2R0 are all RoHS non-compliant.

Packaging Format: The 41F2R0E and 41F2R0 are supplied in bulk packaging, while RS01A2R000FS70 is supplied in cut tape format. Packaging selection depends on assembly process requirements and order quantity.

Manufacturer Preference: Ohmite parts (81F2R0, 41F2R0E, 41F2R0) maintain consistency within the Ohmite product line. The Vishay Dale RS01A2R000FS70 provides cross-manufacturer sourcing flexibility.

Operating Temperature Range: The RS01A2R000FS70 specifies an operating temperature range of -65°C to 250°C. The 41F2R0E specifies -55°C to 275°C. The 81F2R0 and 41F2R0 do not specify operating temperature ranges in the provided data.

Inventory Availability: RS01A2R000FS70 has the highest inventory level at 2063 pieces, followed by 41F2R0 at 1129 pieces and 41F2R0E at 1015 pieces.

Frequently Asked Questions (FAQ)

Q: Can the 41F2R0E be used as a direct replacement for the 81F2R0?

A: Yes. Both parts share identical electrical specifications: 2 Ohms resistance, ±1% tolerance, 1W power rating, ±50ppm/°C temperature coefficient, and axial through-hole package. The primary difference is RoHS compliance status; the 41F2R0E is RoHS Compliant while the 81F2R0 is not.

Q: What is the difference between the Ohmite 41F2R0 and 41F2R0E?

A: Both are Ohmite 2 Ohm 1W axial wirewound resistors with identical electrical specifications. The 41F2R0E is RoHS Compliant and specifies an operating temperature range of -55°C to 275°C. The 41F2R0 is RoHS non-compliant and does not specify an operating temperature range. Both are supplied in bulk packaging.

Q: How does the Vishay Dale RS01A2R000FS70 compare to the Ohmite 81F2R0?

A: Electrical specifications are identical: 2 Ohms, ±1% tolerance, 1W power rating, ±50ppm/°C temperature coefficient. The RS01A2R000FS70 is supplied in cut tape format rather than bulk, has a slightly smaller physical dimension (0.094" Dia x 0.406" L versus 0.126" Dia x 0.437" L), includes moisture-resistant features, and specifies an operating temperature range of -65°C to 250°C. Both are RoHS non-compliant.

Q: Are there any physical dimension concerns when substituting these parts?

A: The RS01A2R000FS70 has smaller physical dimensions than the 81F2R0, 41F2R0E, and 41F2R0. In applications where PCB layout or mechanical clearance is constrained, the smaller RS01A2R000FS70 may offer advantages. All parts maintain the same axial through-hole termination style and are compatible with standard PCB footprints designed for 2 Ohm 1W axial resistors.

Q: Which substitute should I select if RoHS compliance is required?

A: The 41F2R0E is the only RoHS Compliant option among the available substitutes. It maintains full electrical and mechanical compatibility with the 81F2R0 while meeting RoHS requirements.

Q: Can I mix these parts in the same assembly?

A: Yes. All parts are electrically and mechanically equivalent and can be used interchangeably in the same circuit design and PCB layout. Mixing different manufacturers or series within a single assembly does not create compatibility issues based on the provided specifications.