Equivalent & Substitute Parts for Ohmite 45F2K0

Part Overview

The Ohmite 45F2K0 is a 2 kOhms ±1% 5W through-hole resistor with axial wirewound construction, part of the Ohmicone® 40 series. This component is currently active in production with 706 units in stock. Substitute parts are identified to provide alternative sourcing options when the primary part number becomes unavailable or when specific packaging or compliance requirements necessitate component alternatives.

Substiute Parts

45F2K0

OhmiteIn Stock: 74445F2K0 Datasheet

Current PartRFQ

45F2K0E

OhmiteIn Stock: 337345F2K0E Datasheet

DirectRFQ

ALSR052K000FE12

Vishay DaleIn Stock: 995ALSR052K000FE12 Datasheet

DirectRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitute parts for the 45F2K0 are qualified based on the following critical parameters:

• Resistance value: 2 kOhms (exact match required)
• Tolerance: ±1% (exact match required)
• Power rating: 5W (exact match required)
• Composition: Wirewound (exact match required)
• Package: Axial through-hole (exact match required)
• Number of terminations: 2 (exact match required)

The identified substitutes maintain these core electrical and mechanical specifications, ensuring functional equivalence in circuit applications. Variations in secondary parameters such as temperature coefficient, physical dimensions, and compliance certifications are documented to support engineering selection based on specific application requirements.

Parameter Comparison

Engineering Selection Recommendations

45F2K0E (Ohmite): This part is a direct manufacturer equivalent with identical electrical specifications and physical dimensions to the primary 45F2K0. The 45F2K0E is supplied in bulk packaging and carries ROHS3 compliance certification, whereas the primary part is RoHS non-compliant. This substitute is suitable for applications requiring RoHS compliance or when bulk packaging is preferred. Inventory availability is significantly higher at 3322 units.

ALSR052K000FE12 (Vishay Dale): This substitute maintains all critical electrical parameters (2 kOhms, ±1%, 5W, wirewound, axial). The temperature coefficient is ±30ppm/°C compared to ±20ppm/°C for the primary part. Physical dimensions are slightly smaller (0.312" Dia x 0.875" L versus 0.343" Dia x 0.937" L). This part includes moisture-resistant construction and carries ROHS3 compliance. Operating temperature range is specified as -65°C to 250°C. Selection of this substitute should account for the dimensional difference and the higher temperature coefficient in precision applications.

Frequently Asked Questions (FAQ)

Q: Can the 45F2K0E be used as a direct replacement for the 45F2K0?

A: Yes. The 45F2K0E is electrically and mechanically identical to the 45F2K0, with identical resistance, tolerance, power rating, temperature coefficient, and physical dimensions. The primary difference is packaging format (bulk) and RoHS compliance status (ROHS3 compliant versus non-compliant).

Q: What is the impact of the temperature coefficient difference between the 45F2K0 and ALSR052K000FE12?

A: The ALSR052K000FE12 has a temperature coefficient of ±30ppm/°C compared to ±20ppm/°C for the 45F2K0. In applications requiring high precision across temperature ranges, this 50% increase in temperature coefficient may affect circuit performance. Verification of tolerance stack-up is necessary for temperature-sensitive applications.

Q: Are there physical space constraints when substituting the ALSR052K000FE12?

A: The ALSR052K000FE12 has slightly smaller dimensions (0.312" Dia x 0.875" L) compared to the 45F2K0 (0.343" Dia x 0.937" L). In most applications, this size reduction presents no constraint. However, designs with tight spacing or specific mounting requirements should verify compatibility with the reduced diameter and length.

Q: Which substitute part offers the best compliance profile?

A: Both 45F2K0E and ALSR052K000FE12 carry ROHS3 compliance certification. The ALSR052K000FE12 additionally specifies moisture resistance and an operating temperature range of -65°C to 250°C, providing broader environmental qualification.

Q: What inventory considerations apply to these substitutes?

A: The 45F2K0E offers the highest inventory availability at 3322 units, followed by ALSR052K000FE12 at 898 units, and the primary 45F2K0 at 706 units. For applications requiring immediate availability or high-volume procurement, the 45F2K0E is the preferred option.