Ohmite 41F390 390 Ohm 1W Axial Wirewound Resistor Equivalent & Substitute Parts

Part Overview

The Ohmite 41F390 is a 390 Ohm ±1% 1W 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 711 units in current inventory. Equivalent and substitute parts are identified to support procurement flexibility, supply chain continuity, and application-specific requirements such as enhanced compliance certifications or moisture resistance features.

Substiute Parts

41F390

OhmiteIn Stock: 78141F390 Datasheet

Current PartRFQ

41F390E

OhmiteIn Stock: 104541F390E Datasheet

DirectRFQ

ALSR01390R0FE12

Vishay DaleIn Stock: 1274ALSR01390R0FE12 Datasheet

DirectRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution eligibility for the Ohmite 41F390 is determined by strict equivalence across the following critical parameters:

• Resistance value: 390 Ohms (exact match required)
• Tolerance: ±1% (exact match required)
• Power rating: 1W (exact match required)
• Package type: Axial wirewound (exact match required)
• Termination count: 2 (exact match required)

Two substitute parts meet these criteria. The Ohmite 41F390E is a direct manufacturer equivalent with identical electrical specifications and axial package dimensions. The Vishay Dale ALSR01390R0FE12 meets all core electrical and mechanical requirements while offering enhanced moisture resistance and improved RoHS compliance status. Both substitutes maintain the same resistance, tolerance, power rating, and axial package configuration as the primary part.

Parameter Comparison

Engineering Selection Recommendations

All three parts—41F390, 41F390E, and ALSR01390R0FE12—are active products suitable for 390 Ohm 1W axial wirewound applications. Selection should be based on compliance and environmental requirements:

The Ohmite 41F390E provides direct equivalence with improved RoHS compliance and specified operating temperature range (-55°C ~ 275°C), making it suitable for applications requiring regulatory compliance without design modification.

The Vishay Dale ALSR01390R0FE12 offers ROHS3 compliance, moisture-resistant construction, and extended low-temperature operating range (-65°C ~ 250°C). This part is appropriate for applications in humid environments or those requiring enhanced environmental protection. The slightly smaller physical dimensions (0.110" Dia x 0.406" L versus 0.126" Dia x 0.437" L) may provide space advantages in compact layouts, though board-level fit must be confirmed.

The original 41F390 remains available with 711 units in stock and is suitable for applications without RoHS compliance mandates.

Frequently Asked Questions (FAQ)

Q: Can the 41F390E directly replace the 41F390 in existing designs?

A: Yes. The 41F390E maintains identical electrical specifications (390 Ohms ±1%, 1W) and axial package dimensions (0.126" Dia x 0.437" L). The primary difference is improved RoHS compliance status and a specified operating temperature range of -55°C ~ 275°C.

Q: What are the physical dimension differences between the ALSR01390R0FE12 and the original 41F390?

A: The ALSR01390R0FE12 has a smaller diameter (0.110" versus 0.126") and shorter length (0.406" versus 0.437"). While electrically equivalent, board layout and hole spacing must be verified before substitution to ensure mechanical compatibility.

Q: Which substitute part is recommended for moisture-sensitive applications?

A: The Vishay Dale ALSR01390R0FE12 includes moisture-resistant construction and maintains MSL 1 (Unlimited) rating, making it suitable for applications exposed to humidity or condensation.

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

A: The 41F390E and ALSR01390R0FE12 both specify operating temperature ranges. The 41F390E operates to 275°C maximum, while the ALSR01390R0FE12 operates to 250°C maximum. The original 41F390 does not specify an operating temperature range.

Q: What is the difference in temperature coefficient between these parts?

A: The Ohmite parts (41F390 and 41F390E) have a temperature coefficient of ±20ppm/°C, while the Vishay Dale ALSR01390R0FE12 has ±30ppm/°C. For precision applications requiring minimal temperature-dependent resistance drift, the Ohmite parts offer superior stability.

Q: Which part should be selected for new designs requiring RoHS compliance?

A: Both the 41F390E (RoHS Compliant) and ALSR01390R0FE12 (ROHS3 Compliant) meet RoHS requirements. The ROHS3 designation on the Vishay Dale part indicates compliance with the most recent RoHS directive revision.