OX391K Equivalent & Substitute Parts

Part Overview

The OX391K is a 390 Ohms ±10% 1W through-hole resistor with axial leads, manufactured by Ohmite. This ceramic composition resistor features moisture-resistant and pulse-withstanding characteristics, designed for applications requiring reliable performance across a wide operating temperature range of -40°C to 220°C. The OX391K is currently classified as obsolete, making identification of suitable substitute components essential for ongoing design support and production continuity.

Substiute Parts

OX391K

OhmiteIn Stock: 1004OX391K Datasheet

Current PartRFQ

OX391KE

OhmiteIn Stock: 5059OX391KE Datasheet

DirectRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution of the OX391K is determined by strict equivalence across the following critical parameters:

• Resistance value: 390 Ohms
• Tolerance: ±10%
• Power rating: 1W
• Package configuration: Axial through-hole
• Physical dimensions: 0.217" Dia x 0.650" L (5.50mm x 16.50mm)
• Composition: Ceramic
• Operating temperature range: -40°C ~ 220°C
• Temperature coefficient: -1000 / -1600 ppm/°C
• Features: Moisture Resistant, Pulse Withstanding

The OX391KE meets all electrical and mechanical specifications required for direct substitution. Both components are manufactured by Ohmite within the OX series and maintain identical functional characteristics.

Parameter Comparison

Engineering Selection Recommendations

The OX391KE is the direct equivalent substitute for the obsolete OX391K. Both components are manufactured by Ohmite and maintain identical electrical and mechanical specifications across all critical parameters including resistance, tolerance, power rating, package configuration, and operating temperature range.

The primary distinction between the two components is product status and regulatory compliance. The OX391K is obsolete, while the OX391KE is active and carries ROHS3 compliance certification, whereas the OX391K is RoHS non-compliant. For new designs or production requiring regulatory compliance with modern environmental standards, the OX391KE is the appropriate selection. For legacy system maintenance where RoHS compliance is not a requirement, the OX391KE remains functionally equivalent and maintains full compatibility with existing circuit designs.

Frequently Asked Questions (FAQ)

Q: Can the OX391KE be used as a direct replacement for the OX391K in existing designs?

A: Yes. The OX391KE is electrically and mechanically equivalent to the OX391K. Both components share identical resistance values, tolerance, power rating, package configuration, physical dimensions, operating temperature range, and functional features. No circuit modifications are required for substitution.

Q: What is the primary reason for substituting the OX391K?

A: The OX391K is classified as obsolete. The OX391KE is the active equivalent from the same manufacturer and series, ensuring continued availability and production support.

Q: Are there any compliance differences between the OX391K and OX391KE?

A: Yes. The OX391KE is ROHS3 compliant, while the OX391K is RoHS non-compliant. For applications subject to RoHS regulations or environmental compliance requirements, the OX391KE is the required selection.

Q: Are the physical dimensions identical between both components?

A: Yes. Both the OX391K and OX391KE have identical dimensions of 0.217" Dia x 0.650" L (5.50mm x 16.50mm), ensuring compatibility with existing PCB layouts and mechanical assemblies.

Q: What is the packaging difference between the OX391K and OX391KE?

A: The OX391K is supplied in standard packaging, while the OX391KE is supplied in bulk packaging. This difference does not affect component functionality or electrical performance.