Equivalent & Substitute Parts for 45F3K9E

Part Overview

The 45F3K9E is a 3.9 kOhms ±1% 5W axial wirewound through-hole resistor manufactured by Ohmite, part of the Ohmicone® 40 series. This component is designed for applications requiring precision resistance with moderate power dissipation in a compact axial package. The part maintains Active product status with 926 units currently in stock. Substitute parts are identified when equivalent electrical specifications and mechanical compatibility are required due to supply constraints, design flexibility, or procurement optimization.

Substiute Parts

45F3K9E

OhmiteIn Stock: 101245F3K9E Datasheet

Current PartRFQ

RS0053K900FE73

Vishay DaleIn Stock: 911RS0053K900FE73 Datasheet

MFR RecommendedRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution eligibility for the 45F3K9E is determined by strict equivalence across the following critical parameters:

• Resistance Value: Must be 3.9 kOhms
• Tolerance: Must be ±1%
• Power Rating: Must be 5W
• Composition: Must be Wirewound
• Package Type: Must be Axial
• Temperature Coefficient: Must be ±20ppm/°C
• Regulatory Compliance: Must maintain ROHS3 Compliant status

The RS0053K900FE73 (Vishay Dale, RS series) meets all substitution criteria. Both parts share identical electrical specifications and axial package configuration, enabling direct functional interchange in circuit applications.

Parameter Comparison

Engineering Selection Recommendations

Both the 45F3K9E and RS0053K900FE73 are Active status components with ROHS3 compliance and REACH Unaffected designation, meeting current regulatory requirements for industrial and commercial applications.

The 45F3K9E (Ohmite Ohmicone® 40 series) is suitable for standard applications where bulk packaging is preferred and baseline specifications are sufficient.

The RS0053K900FE73 (Vishay Dale RS series) provides additional moisture resistance and an extended operating temperature range of -65°C to 250°C, making it applicable to environments with elevated humidity or thermal extremes. The slightly smaller physical dimensions (0.312" diameter vs. 0.343" diameter) may offer space optimization benefits in compact layouts. Cut tape packaging supports automated assembly workflows.

Selection between these parts depends on application environment, assembly methodology, and packaging requirements, with both maintaining full electrical and mechanical compatibility.

Frequently Asked Questions (FAQ)

Q: Can RS0053K900FE73 directly replace 45F3K9E in existing designs?

A: Yes. Both parts share identical resistance value (3.9 kOhms), tolerance (±1%), power rating (5W), temperature coefficient (±20ppm/°C), and axial package configuration. Electrical performance is equivalent. Physical dimensions differ slightly; verify PCB layout clearances before substitution.

Q: What is the significance of the moisture resistant feature on the RS0053K900FE73?

A: Moisture resistance provides enhanced reliability in humid environments or applications with condensation exposure. This feature is not specified for the 45F3K9E. Selection depends on environmental conditions of the target application.

Q: How do the physical dimensions affect substitution?

A: The RS0053K900FE73 is slightly smaller (0.312" diameter, 0.875" length) compared to the 45F3K9E (0.343" diameter, 0.937" length). Both fit standard axial component footprints, but verify PCB hole spacing and component clearances to adjacent parts before substitution.

Q: Are there differences in packaging that affect procurement or assembly?

A: The 45F3K9E is supplied in Bulk packaging, while RS0053K900FE73 is supplied in Cut Tape (CT) format. Cut tape is optimized for automated pick-and-place assembly; bulk packaging is suitable for manual assembly or reel consolidation.

Q: Do both parts meet current compliance standards?

A: Yes. Both parts are ROHS3 Compliant, REACH Unaffected, and classified as EAR99 for export control purposes. Both maintain Active product status.