Ohmite 45F4K7 Equivalent & Substitute Parts

Part Overview

The Ohmite 45F4K7 is a 4.7 kOhms ±1% 5W through-hole resistor with axial wirewound composition, part of the Ohmicone® 40 series. This component is currently active in production with 1071 pieces in stock. Alternative equivalent parts are necessary to support supply chain flexibility, design redundancy, and procurement optimization across manufacturing environments.

Substiute Parts

45F4K7

OhmiteIn Stock: 111745F4K7 Datasheet

Current PartRFQ

45F4K7E

OhmiteIn Stock: 113845F4K7E Datasheet

DirectRFQ

ALSR054K700FE12

Vishay DaleIn Stock: 1025ALSR054K700FE12 Datasheet

DirectRFQ

Key Parameters

Substitute Part Grouping Explanation

Equivalent substitution for the Ohmite 45F4K7 is determined by strict alignment of the following electrical and mechanical parameters:

• Resistance value: 4.7 kOhms
• Tolerance: ±1%
• Power rating: 5W
• Composition: Wirewound
• Package configuration: Axial through-hole
• Termination count: 2

The identified substitute parts maintain these core specifications. Variations in temperature coefficient, physical dimensions within tolerance, and compliance certifications do not prevent functional equivalence in standard applications.

Parameter Comparison

Engineering Selection Recommendations

All three parts meet the core electrical and mechanical substitution criteria. Selection should be based on the following factors:

45F4K7E (Ohmite): Direct manufacturer equivalent with identical physical dimensions and temperature coefficient. Offers ROHS3 compliance upgrade from the original 45F4K7. Recommended for applications requiring RoHS compliance without design modification.

ALSR054K700FE12 (Vishay Dale): Functionally equivalent with slightly tighter temperature coefficient specification (±30ppm/°C vs ±20ppm/°C) and moisture-resistant construction. Physical dimensions are marginally smaller (0.312" Dia x 0.875" L). ROHS3 compliant. Suitable for applications with extended operating temperature range (-65°C ~ 250°C) and moisture exposure requirements.

Frequently Asked Questions (FAQ)

Q: Can 45F4K7E be used as a direct drop-in replacement for 45F4K7?

A: Yes. The 45F4K7E maintains identical electrical specifications (4.7 kOhms ±1%, 5W, ±20ppm/°C) and physical dimensions (0.343" Dia x 0.937" L). The primary difference is RoHS3 compliance status. No circuit redesign is required.

Q: What are the dimensional differences between ALSR054K700FE12 and the original 45F4K7?

A: The ALSR054K700FE12 has a slightly smaller diameter (0.312" vs 0.343") and shorter length (0.875" vs 0.937" L). These differences may affect PCB layout and mechanical clearance. Verify board space availability before substitution.

Q: Does the ±30ppm/°C temperature coefficient of ALSR054K700FE12 affect circuit performance compared to ±20ppm/°C?

A: Temperature coefficient differences impact long-term stability and precision applications. The ALSR054K700FE12 specification is within acceptable tolerance for most standard applications. Verify temperature stability requirements for your specific circuit design.

Q: Are all three parts suitable for high-temperature applications?

A: The ALSR054K700FE12 specifies an operating temperature range of -65°C ~ 250°C. Operating temperature specifications for 45F4K7 and 45F4K7E are not provided in the available data. Confirm temperature requirements with application specifications before selection.

Q: What is the significance of moisture-resistant construction in ALSR054K700FE12?

A: Moisture-resistant wirewound construction provides enhanced performance in humid or wet environments. This feature is relevant only if your application environment requires such protection. Standard wirewound construction is adequate for typical indoor industrial applications.