OF391JE Equivalent & Substitute Parts

Part Overview

The OF391JE is a 390 Ohms ±5% 0.5W through-hole resistor in axial configuration, manufactured by Ohmite as part of the Little Demon® OF series. This carbon composition resistor features pulse withstanding capability and is classified as obsolete. Due to its obsolete status and limited availability relative to substitute options, identifying equivalent parts is essential for design continuity and procurement planning.

Substiute Parts

OF391JE

OhmiteIn Stock: 948OF391JE Datasheet

Current PartRFQ

OF391KE

OhmiteIn Stock: 1855OF391KE Datasheet

MFR RecommendedRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution for the OF391JE is determined by the following critical parameters:

• Resistance value: 390 Ohms (exact match required)
• Power rating: 0.5W minimum
• Package configuration: Axial through-hole
• Physical dimensions: Compatible with 0.150" Dia x 0.406" L footprint
• Composition: Carbon composition technology
• RoHS compliance: ROHS3 Compliant

The OF391KE qualifies as a direct substitute based on matching resistance, power rating, package type, dimensions, composition, and compliance certifications. The tolerance specification differs (±10% versus ±5%), which represents a relaxation of the tolerance requirement and does not preclude substitution in applications where the tighter tolerance of the original part is not mandatory.

Parameter Comparison

Engineering Selection Recommendations

The OF391KE is the manufacturer-recommended substitute for the OF391JE. Both parts maintain identical physical dimensions, power ratings, and package configurations, ensuring direct mechanical and electrical compatibility in circuit board layouts. Both components are ROHS3 compliant and carry MSL rating 1, meeting modern environmental and reliability standards.

The primary distinction is tolerance specification: the OF391JE provides ±5% tolerance while the OF391KE provides ±10% tolerance. Selection between these parts depends on circuit requirements for resistance accuracy. Applications requiring the tighter ±5% tolerance must use the OF391JE; applications where ±10% tolerance is acceptable may use either part based on availability.

Frequently Asked Questions (FAQ)

Q: Can OF391KE be used in place of OF391JE?

A: Yes, provided the circuit design permits ±10% tolerance. The OF391KE matches all mechanical, electrical, and compliance specifications of the OF391JE except for the relaxed tolerance band.

Q: Are the physical dimensions identical?

A: Yes. Both parts measure 0.150" Dia x 0.406" L (3.80mm x 10.30mm) and use identical axial through-hole termination, ensuring direct board-level compatibility.

Q: Do both parts meet current RoHS requirements?

A: Yes. Both OF391JE and OF391KE are ROHS3 compliant with MSL rating 1 (unlimited moisture sensitivity level).

Q: What is the key difference between these parts?

A: The tolerance specification differs: OF391JE is ±5% while OF391KE is ±10%. Both deliver 390 Ohms at 0.5W power rating in carbon composition construction.

Q: Are both parts obsolete?

A: Yes. Both the OF391JE and OF391KE are classified as obsolete products. Inventory availability should be confirmed with suppliers before design commitment.