OA181KE Equivalent & Substitute Parts

Part Overview

The OA181KE is a 180 Ohm ±10% 1W through-hole resistor in axial configuration, manufactured by Ohmite as part of the Little Demon® OA series. This carbon composition resistor features pulse withstanding capability and is rated for unlimited moisture sensitivity (MSL 1). The product is currently obsolete, making identification of suitable substitute components essential for ongoing maintenance, repair, and legacy system support.

Substiute Parts

OA181KE

OhmiteIn Stock: 1161OA181KE Datasheet

Current PartRFQ

OX181KE

OhmiteIn Stock: 5451OX181KE Datasheet

MFR RecommendedRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution of the OA181KE is determined by the following critical parameters:

• Resistance Value: 180 Ohms (exact match required)
• Tolerance: ±10% (defines acceptable resistance range)
• Power Rating: 1W (minimum power dissipation capability)
• Package Configuration: Axial through-hole (physical and electrical interface requirement)
• Number of Terminations: 2 (electrical connection points)

The OX181KE qualifies as a direct substitute because it matches all critical electrical parameters (180 Ohms ±10%, 1W power rating) and maintains the same axial package configuration with two terminations. While the OX181KE uses ceramic composition instead of carbon composition and includes moisture-resistant properties, these represent functional enhancements rather than incompatibilities. The OX181KE is actively manufactured and stocked, providing reliable availability for replacement applications.

Parameter Comparison

Engineering Selection Recommendations

The OX181KE is the manufacturer-recommended substitute for the obsolete OA181KE. Both components are manufactured by Ohmite and maintain identical electrical specifications (180 Ohms ±10%, 1W). The OX181KE is actively produced and maintains full REACH compliance and EAR99 export classification, matching the regulatory status of the original part.

The transition from carbon composition to ceramic composition in the OX181KE provides enhanced moisture resistance without compromising pulse withstanding capability. Both components retain the same axial package configuration and two-termination design, ensuring direct physical and electrical compatibility in circuit board layouts.

Frequently Asked Questions (FAQ)

Q: Can the OX181KE be used as a direct replacement for the OA181KE in existing designs?

A: Yes. The OX181KE matches the critical electrical parameters (180 Ohms ±10%, 1W power rating) and maintains the same axial package configuration with two terminations. Physical footprint compatibility is maintained for through-hole mounting applications.

Q: What is the primary difference between the OA181KE and OX181KE?

A: The OA181KE uses carbon composition construction, while the OX181KE uses ceramic composition with added moisture-resistant properties. Both deliver identical resistance values, tolerance, and power ratings. The OX181KE's ceramic construction provides improved environmental performance.

Q: Why is the OA181KE listed as obsolete?

A: The OA181KE is part of the discontinued Little Demon® OA series. The OX181KE from the active OX series represents the current production equivalent, offering the same electrical performance with enhanced reliability features.

Q: Are there any compliance or regulatory differences between these parts?

A: Both components maintain REACH Unaffected status and EAR99 export classification. The OX181KE is RoHS3 compliant, ensuring compatibility with modern manufacturing and environmental standards.

Q: What inventory considerations apply to these parts?

A: The OA181KE is obsolete with limited remaining stock (1106 pcs). The OX181KE is actively manufactured with substantial inventory availability (5408 pcs), providing reliable long-term sourcing for new designs and ongoing production requirements.