Ohmite 40F300 Equivalent & Substitute Parts

Part Overview

The Ohmite 40F300 is a 300 Ohm, ±1% tolerance, 10W axial wirewound through-hole resistor from the Ohmicone® 40 series. This component is classified as Active product status and is suitable for applications requiring precision resistive elements in power dissipation circuits. Substitute parts are identified when equivalent electrical and mechanical parameters are required due to inventory constraints, packaging preferences, or compliance requirements.

Substiute Parts

40F300

OhmiteIn Stock: 118340F300 Datasheet

Current PartRFQ

40F300E

OhmiteIn Stock: 116040F300E Datasheet

Parametric EquivalentRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitute parts for the Ohmite 40F300 are identified based on matching the following critical parameters:

• Resistance value: 300 Ohms
• Tolerance: ±1%
• Power rating: 10W
• Composition: Wirewound
• Temperature coefficient: ±20ppm/°C
• Package type: Axial
• Physical dimensions: 0.406" Dia x 1.902" L (10.30mm x 48.30mm)
• Number of terminations: 2

The 40F300E variant meets all electrical and mechanical specifications identical to the primary part, with the distinction of bulk packaging and enhanced RoHS3 compliance status.

Parameter Comparison

Engineering Selection Recommendations

Both the 40F300 and 40F300E are Active status components suitable for direct substitution based on identical electrical and mechanical parameters. Selection between these parts should be based on:

• RoHS compliance requirements: The 40F300E provides RoHS3 compliance, whereas the 40F300 is RoHS non-compliant. Applications subject to RoHS directives require the 40F300E variant.
• Packaging requirements: The 40F300E is supplied in bulk packaging, while the 40F300 uses standard packaging. Procurement volume and handling procedures may influence packaging selection.

Both parts share identical ECCN (EAR99) and HTSUS (8533.21.0080) classifications, indicating equivalent regulatory treatment for export and tariff purposes.

Frequently Asked Questions (FAQ)

Q: Can the 40F300E be used as a direct replacement for the 40F300?

A: Yes. The 40F300E is a parametric equivalent with identical electrical specifications (300 Ohms, ±1%, 10W, ±20ppm/°C) and mechanical dimensions (0.406" Dia x 1.902" L). The primary difference is RoHS3 compliance status and bulk packaging format.

Q: What is the significance of the RoHS compliance difference?

A: The 40F300E is RoHS3 compliant, while the 40F300 is RoHS non-compliant. Applications manufactured for markets with RoHS directives must use the 40F300E variant to meet regulatory requirements.

Q: Are the physical dimensions identical between both parts?

A: Yes. Both the 40F300 and 40F300E have identical axial package dimensions of 0.406" diameter by 1.902" length (10.30mm x 48.30mm), ensuring mechanical compatibility in PCB layouts and through-hole applications.

Q: Does packaging format affect electrical performance?

A: No. Bulk packaging (40F300E) and standard packaging (40F300) do not affect electrical performance. Packaging selection is determined by procurement volume, handling procedures, and inventory management requirements.

Q: Are both parts from the same manufacturer?

A: Yes. Both the 40F300 and 40F300E are manufactured by Ohmite and belong to the Ohmicone® 40 series, ensuring consistent quality and performance characteristics.