Ohmite 45F390 390 Ohm 5W Axial Wirewound Resistor - Equivalent & Substitute Parts

Part Overview

The Ohmite 45F390 is a 390 Ohm ±1% 5W through-hole resistor with axial wirewound construction, part of the Ohmicone® 40 series. This component is designed for applications requiring precision resistive elements with moderate power dissipation in compact axial packages. The part maintains active product status with 921 units in current inventory. Equivalent and substitute parts are identified to support procurement flexibility, supply chain continuity, and application-specific compliance requirements.

Substiute Parts

45F390

OhmiteIn Stock: 93945F390 Datasheet

Current PartRFQ

45F390E

OhmiteIn Stock: 72145F390E Datasheet

DirectRFQ

ALSR05390R0FE12

Vishay DaleIn Stock: 2235ALSR05390R0FE12 Datasheet

DirectRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution eligibility for the Ohmite 45F390 is determined by strict equivalence across the following critical parameters:

• Resistance value: 390 Ohms (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)
• Termination count: 2 (exact match required)

The identified substitute parts meet all mandatory electrical and mechanical criteria. Dimensional variations within the axial package category and differences in temperature coefficient or compliance certifications do not preclude functional substitution when these core parameters align.

Parameter Comparison

Engineering Selection Recommendations

45F390E (Ohmite): This part is a direct equivalent to the 45F390, maintaining identical electrical specifications and physical dimensions. The primary distinction is packaging format (bulk versus tape and reel) and RoHS3 compliance status. Selection of 45F390E is appropriate when ROHS3 compliance is required or when bulk packaging aligns with procurement workflows.

ALSR05390R0FE12 (Vishay Dale): This substitute meets all core electrical and mechanical requirements with ROHS3 compliance and an extended operating temperature range of -65°C to 250°C. The temperature coefficient is ±30ppm/°C compared to ±20ppm/°C for the Ohmite variants. Physical dimensions are slightly smaller (0.312" Dia x 0.875" L versus 0.343" Dia x 0.937" L). Selection is appropriate for applications requiring extended temperature operation or when higher inventory availability is prioritized.

Frequently Asked Questions (FAQ)

Q: Can the 45F390E be used as a direct replacement for the 45F390?

A: Yes. Both parts share identical resistance (390 Ohms), tolerance (±1%), power rating (5W), composition (wirewound), package type (axial), and physical dimensions. The difference is packaging format and RoHS compliance status.

Q: What are the key differences between the Ohmite 45F390 and the Vishay Dale ALSR05390R0FE12?

A: Both parts meet the core electrical specifications (390 Ohms ±1% 5W wirewound axial). The ALSR05390R0FE12 features a ±30ppm/°C temperature coefficient versus ±20ppm/°C, an extended operating temperature range (-65°C to 250°C), slightly smaller physical dimensions, and moisture-resistant construction. Both are ROHS3 compliant.

Q: Are there dimensional compatibility concerns when substituting the ALSR05390R0FE12?

A: The ALSR05390R0FE12 is slightly smaller (0.312" Dia x 0.875" L) compared to the 45F390 (0.343" Dia x 0.937" L). Both are axial through-hole packages. Verify PCB layout and mechanical clearances for your specific application before substitution.

Q: Which substitute part should I select for RoHS3 compliance?

A: Both 45F390E and ALSR05390R0FE12 carry ROHS3 compliance certification. The 45F390 is RoHS non-compliant. Select either compliant substitute based on availability, packaging requirements, and temperature specifications.

Q: Does the temperature coefficient difference affect substitution suitability?

A: The ALSR05390R0FE12 has a ±30ppm/°C temperature coefficient compared to ±20ppm/°C for the Ohmite parts. This difference is within typical wirewound resistor specifications. Substitution is valid unless your application requires the tighter ±20ppm/°C specification.