Equivalent & Substitute Parts for Ohmite 45F1K0

Part Overview

The Ohmite 45F1K0 is a 1 kOhms ±1% 5W through-hole resistor with axial wirewound construction from the Ohmicone® 40 series. This component is classified as Active product status. Equivalent and substitute parts are identified to support procurement flexibility, inventory management, and supply chain continuity when the primary part becomes unavailable or when alternative specifications better suit application requirements.

Substiute Parts

45F1K0

OhmiteIn Stock: 85945F1K0 Datasheet

Current PartRFQ

ALSR051K000FE12

Vishay DaleIn Stock: 1164ALSR051K000FE12 Datasheet

DirectRFQ

RS0051K000FS73

Vishay DaleIn Stock: 1532RS0051K000FS73 Datasheet

MFR RecommendedRFQ

85F1K0

OhmiteIn Stock: 81285F1K0 Datasheet

Parametric EquivalentRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitute parts for the 45F1K0 are classified based on electrical parameter equivalence and mechanical compatibility. All identified substitutes maintain the core electrical specifications: 1 kOhms resistance value, ±1% tolerance, and 5W power rating. All substitutes utilize wirewound construction with axial package configuration and two terminations, ensuring direct functional replacement capability.

The substitution logic is based on the following allowed parameters:

• Resistance value and tolerance matching
• Power rating equivalence
• Wirewound composition
• Axial package compatibility
• Terminal count alignment

Parameter Comparison

Engineering Selection Recommendations

Ohmite 85F1K0: This part is a parametric equivalent from Ohmite's Acrasil® 80 series. It matches all core electrical specifications and physical dimensions of the 45F1K0. Both parts share identical RoHS non-compliant status and REACH Unaffected classification. Selection of this substitute maintains consistency with the original manufacturer and series compatibility.

Vishay Dale RS0051K000FS73: This part is the manufacturer-recommended substitute from Vishay Dale's RS series. It maintains all critical electrical parameters and provides an extended operating temperature range of -65°C to 250°C. The part is supplied in Cut Tape (CT) packaging. RoHS non-compliant status matches the primary part, though REACH status differs (REACH Affected versus REACH Unaffected).

Vishay Dale ALSR051K000FE12: This part is a direct manufacturer equivalent from Vishay Dale's ALSR series with moisture-resistant features. It achieves ROHS3 compliance, providing regulatory advantage over the primary part. Operating temperature range extends to -65°C ~ 250°C. Temperature coefficient is ±30ppm/°C, representing a 50% increase from the primary part specification. Physical dimensions are slightly smaller (0.312" Dia x 0.875" L versus 0.343" Dia x 0.937" L), which may affect board layout compatibility.

Frequently Asked Questions (FAQ)

Q: Can the 85F1K0 be used as a direct replacement for the 45F1K0?

A: Yes. The 85F1K0 maintains identical electrical specifications (1 kOhms ±1%, 5W), wirewound composition, axial package configuration, and physical dimensions. Both are Ohmite products with matching RoHS and REACH compliance status.

Q: What is the primary difference between the Ohmite and Vishay Dale substitutes?

A: The Ohmite 85F1K0 is a parametric equivalent within the same manufacturer family. The Vishay Dale parts (RS0051K000FS73 and ALSR051K000FE12) are cross-manufacturer alternatives that provide extended operating temperature ranges (-65°C ~ 250°C) not specified for the Ohmite parts. The ALSR051K000FE12 additionally offers ROHS3 compliance and moisture-resistant features.

Q: Are there physical dimension differences between substitutes?

A: Yes. The Ohmite 45F1K0 and 85F1K0 share identical dimensions (0.343" Dia x 0.937" L). The Vishay Dale parts (RS0051K000FS73 and ALSR051K000FE12) are slightly smaller at 0.312" Dia x 0.875" L. Verify board layout and mounting hole spacing before substitution.

Q: Which substitute offers the best regulatory compliance?

A: The ALSR051K000FE12 is ROHS3 compliant, whereas the primary part and other substitutes are RoHS non-compliant. Selection depends on application regulatory requirements.

Q: Does the temperature coefficient difference in the ALSR051K000FE12 affect substitution suitability?

A: The ALSR051K000FE12 has a temperature coefficient of ±30ppm/°C compared to ±20ppm/°C for the primary part. This represents a 50% increase in temperature-dependent resistance drift. Substitution suitability depends on circuit tolerance requirements and operating temperature range.

Q: What packaging formats are available for these substitutes?

A: The 45F1K0 and 85F1K0 packaging is not specified. The RS0051K000FS73 is supplied in Cut Tape (CT) format. The ALSR051K000FE12 is supplied in Bulk packaging. Verify packaging compatibility with assembly processes.