Ohmite 41F300 Equivalent & Substitute Parts

Part Overview

The Ohmite 41F300 is a 300 Ohms ±1% 1W through-hole resistor with axial wirewound composition, part of the Ohmicone® 40 series. This component is currently active in production with 1092 pieces in stock. Equivalent and substitute parts are identified to support procurement flexibility, inventory management, and design continuity when the primary part becomes unavailable or when alternative packaging or compliance requirements necessitate component substitution.

Substiute Parts

41F300

OhmiteIn Stock: 118741F300 Datasheet

Current PartRFQ

41F300E

OhmiteIn Stock: 100841F300E Datasheet

DirectRFQ

ALSR01300R0FE12

Vishay DaleIn Stock: 1272ALSR01300R0FE12 Datasheet

DirectRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitute parts for the Ohmite 41F300 are qualified based on the following electrical and mechanical parameters:

• Resistance value: 300 Ohms (exact match required)
• Tolerance: ±1% (exact match required)
• Power rating: 1W (exact match required)
• Composition: Wirewound (exact match required)
• Package type: Axial (exact match required)
• Number of terminations: 2 (exact match required)

Substitutes may vary in temperature coefficient, operating temperature range, physical dimensions, RoHS compliance status, and moisture resistance features, provided the core electrical specifications remain identical. The following parts meet these substitution criteria:

1. 41F300E (Ohmite) – Direct manufacturer equivalent with improved RoHS3 compliance
2. ALSR01300R0FE12 (Vishay Dale) – Cross-manufacturer substitute with enhanced moisture resistance and extended operating temperature range

Parameter Comparison

Engineering Selection Recommendations

41F300E (Ohmite): This part is the direct manufacturer equivalent and maintains identical electrical specifications and physical dimensions. Selection of 41F300E is appropriate when RoHS3 compliance is required or when procurement from the same manufacturer is preferred. Both parts are active in production.

ALSR01300R0FE12 (Vishay Dale): This cross-manufacturer substitute meets all core electrical requirements and provides additional benefits including ROHS3 compliance, moisture resistance, and an extended operating temperature range of -65°C to 250°C. Physical dimensions are slightly smaller (0.110" Dia x 0.406" L versus 0.126" Dia x 0.437" L). Selection is appropriate for applications requiring moisture resistance, extended temperature operation, or when Vishay Dale components are preferred in the supply chain. Verify PCB layout accommodation for the reduced physical dimensions.

Frequently Asked Questions (FAQ)

Q: Can 41F300E be used as a direct replacement for 41F300?

A: Yes. The 41F300E maintains identical electrical specifications (300 Ohms ±1%, 1W wirewound) and physical dimensions (0.126" Dia x 0.437" L). The primary difference is improved RoHS3 compliance status. No circuit redesign or PCB layout modification is required.

Q: What are the key differences between 41F300 and ALSR01300R0FE12?

A: Both parts share identical electrical specifications (300 Ohms ±1%, 1W wirewound, axial package). The ALSR01300R0FE12 differs in: temperature coefficient (±30ppm/°C versus ±20ppm/°C), operating temperature range (-65°C to 250°C versus unspecified), moisture resistance feature, physical dimensions (0.110" Dia x 0.406" L versus 0.126" Dia x 0.437" L), and manufacturer (Vishay Dale versus Ohmite).

Q: Are there any PCB layout considerations when substituting with ALSR01300R0FE12?

A: Yes. The ALSR01300R0FE12 has smaller physical dimensions (0.110" Dia x 0.406" L) compared to the original 41F300 (0.126" Dia x 0.437" L). Verify that the PCB footprint and component spacing accommodate the reduced size. The axial package type remains unchanged, so lead spacing compatibility should be confirmed.

Q: Which substitute part should be selected for high-temperature applications?

A: The ALSR01300R0FE12 is specified for operation from -65°C to 250°C, providing extended temperature capability. The 41F300 and 41F300E do not specify operating temperature limits. For applications requiring confirmed high-temperature performance, ALSR01300R0FE12 is the appropriate selection.

Q: Are all substitute parts RoHS compliant?

A: The 41F300 is RoHS non-compliant. Both 41F300E and ALSR01300R0FE12 are ROHS3 compliant. For applications or supply chains requiring RoHS compliance, either 41F300E or ALSR01300R0FE12 is suitable.

Q: What is the moisture resistance difference between these parts?

A: The 41F300 and 41F300E are standard wirewound resistors without specified moisture resistance features. The ALSR01300R0FE12 is explicitly rated as moisture resistant. For applications in humid or moisture-prone environments, ALSR01300R0FE12 provides enhanced protection.