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OA391KE Equivalent & Substitute Parts
Part Overview
The OA391KE is a 390 Ohms ±10% 1W through-hole resistor in axial package manufactured by Ohmite as part of the Little Demon® OA series. This carbon composition resistor features pulse withstanding capability and is designed for through-hole applications. The product is currently obsolete, making identification of suitable substitute components essential for ongoing maintenance, repair, and legacy system support.
Substiute Parts
Key Parameters
| Parameter | Value |
|---|---|
| Resistance | 390 Ohms |
| Tolerance | ±10% |
| Power Rating | 1W |
| Composition | Carbon Composition |
| Package Type | Axial |
| Terminations | 2 |
| Features | Pulse Withstanding |
| Moisture Sensitivity Level | 1 (Unlimited) |
Substitute Part Grouping Explanation
Substitution of the OA391KE is determined by strict equivalence across the following electrical and mechanical parameters:
- Resistance Value: 390 Ohms (exact match required)
- Tolerance: ±10% (defines acceptable resistance range)
- Power Rating: 1W (minimum power dissipation capability)
- Package Configuration: Axial through-hole (mechanical and electrical interface requirement)
- Termination Count: 2 (circuit connectivity requirement)
- Pulse Withstanding Capability: Required feature for equivalent performance
The OX391KE qualifies as a direct substitute based on matching all critical electrical parameters and package specifications. While the OX391KE uses ceramic composition instead of carbon composition and includes moisture resistance as an additional feature, both components meet the core functional requirements for 390 Ohm, 1W, ±10% tolerance axial resistor applications.
Parameter Comparison
| Parameter | OA391KE (Main Part) | OX391KE (Substitute) |
|---|---|---|
| Manufacturer | Ohmite | Ohmite |
| Resistance | 390 Ohms | 390 Ohms |
| Tolerance | ±10% | ±10% |
| Power Rating | 1W | 1W |
| Composition | Carbon Composition | Ceramic |
| Package Type | Axial | Axial |
| Terminations | 2 | 2 |
| Features | Pulse Withstanding | Moisture Resistant, Pulse Withstanding |
| Temperature Coefficient | Not specified | -1000 / -1600 ppm/°C |
| Operating Temperature Range | Not specified | -40°C ~ 220°C |
| Product Status | Obsolete | Active |
| RoHS Status | Not specified | ROHS3 Compliant |
| Size / Dimension | 0.236" Dia x 0.591" L (6.00mm x 15.00mm) | 0.217" Dia x 0.650" L (5.50mm x 16.50mm) |
Engineering Selection Recommendations
The OX391KE is the manufacturer-recommended substitute for the obsolete OA391KE. Selection of the OX391KE is supported by the following factors:
- Electrical Equivalence: Both components provide identical resistance value, tolerance, and power rating specifications required for circuit functionality.
- Package Compatibility: Both components use axial through-hole packaging, ensuring mechanical fit in existing PCB layouts and component mounting positions.
- Active Product Status: The OX391KE is an active product with current manufacturing and inventory availability, eliminating supply chain risk associated with the obsolete OA391KE.
- Regulatory Compliance: The OX391KE meets ROHS3 compliance requirements, supporting modern manufacturing and environmental standards.
- Enhanced Features: The OX391KE includes moisture resistance in addition to pulse withstanding capability, providing equivalent or improved performance in standard operating environments.
Frequently Asked Questions (FAQ)
Q: Can the OX391KE be used as a direct replacement for the OA391KE in existing circuits?
A: Yes. Both components meet the core electrical specifications of 390 Ohms, ±10% tolerance, and 1W power rating in axial package configuration. The OX391KE is the manufacturer-recommended substitute.
Q: What is the difference between carbon composition and ceramic resistor construction?
A: Carbon composition and ceramic are different resistor construction technologies. The OA391KE uses carbon composition; the OX391KE uses ceramic. Both achieve the specified 390 Ohm resistance and 1W power rating. The ceramic construction of the OX391KE includes moisture resistance as an additional feature.
Q: Are there physical size differences between the OA391KE and OX391KE?
A: Yes. The OA391KE measures 0.236" diameter x 0.591" length (6.00mm x 15.00mm). The OX391KE measures 0.217" diameter x 0.650" length (5.50mm x 16.50mm). Both are axial package components. Verify PCB layout clearances before substitution if space constraints exist.
Q: Is the OX391KE RoHS compliant?
A: Yes. The OX391KE is ROHS3 compliant. RoHS compliance status for the OA391KE is not specified.
Q: What is the operating temperature range for each component?
A: The operating temperature range for the OA391KE is not specified in available documentation. The OX391KE operates across -40°C to 220°C. Verify temperature requirements for your specific application.
Q: Are both components available for purchase?
A: The OA391KE is obsolete and has limited availability. The OX391KE is an active product with current manufacturing and inventory availability.
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