OA27GKE Equivalent & Substitute Parts

Part Overview

The OA27GKE is a 2.7 Ohm ±10% 1W axial through-hole resistor manufactured by Ohmite as part of the Little Demon® OA series. This carbon composition resistor features pulse withstanding capability and is currently classified as obsolete. Due to its discontinued status, identifying functionally equivalent substitute components is essential for design continuity, repair operations, and legacy system maintenance.

Substiute Parts

OA27GKE

OhmiteIn Stock: 881OA27GKE Datasheet

Current PartRFQ

CFR100J2R7

TE Connectivity Passive ProductIn Stock: 1111CFR100J2R7 Datasheet

MFR RecommendedRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution of the OA27GKE is determined by the following critical parameters:

• Resistance Value: Must be 2.7 Ohms
• Power Rating: Must be 1W minimum
• Package Configuration: Must be axial through-hole
• Tolerance: Acceptable range ±5% to ±10%
• Composition: Carbon film resistors are acceptable substitutes for carbon composition resistors in this application category
• Termination Count: Must be 2-terminal configuration
• Regulatory Compliance: REACH Unaffected status required

The CFR100J2R7 meets all substitution criteria with improved tolerance (±5%) and active product status, making it a direct functional equivalent.

Parameter Comparison

Engineering Selection Recommendations

The CFR100J2R7 is the primary substitute for the obsolete OA27GKE based on the following factors:

• Functional Equivalence: Both components provide 2.7 Ohm resistance at 1W power rating in axial through-hole configuration
• Improved Tolerance: The CFR100J2R7 offers ±5% tolerance, which is superior to the OA27GKE's ±10% tolerance, providing better circuit performance
• Active Product Status: The CFR100J2R7 is currently in active production, ensuring long-term availability and supply chain reliability
• Regulatory Compliance: Both components maintain REACH Unaffected status; the substitute additionally provides ROHS3 compliance
• Physical Compatibility: The CFR100J2R7 is slightly smaller (5.00mm x 12.00mm versus 6.00mm x 15.00mm), which may require PCB layout verification for through-hole mounting
• Composition Difference: The transition from carbon composition to carbon film represents a standard industry practice for obsolete component replacement, with carbon film resistors offering improved stability and temperature characteristics

Frequently Asked Questions (FAQ)

Q: Can the CFR100J2R7 directly replace the OA27GKE without circuit modifications?

A: Yes. Both components share identical resistance value (2.7 Ohms) and power rating (1W) in axial through-hole configuration. The improved tolerance of the CFR100J2R7 (±5% versus ±10%) provides better circuit accuracy without requiring design changes.

Q: What is the physical size difference between these components?

A: The OA27GKE measures 0.236" Dia x 0.591" L (6.00mm x 15.00mm), while the CFR100J2R7 measures 0.197" Dia x 0.472" L (5.00mm x 12.00mm). The substitute is slightly smaller. PCB hole spacing and mounting clearances should be verified during integration.

Q: Why is the OA27GKE classified as obsolete?

A: The OA27GKE is part of Ohmite's Little Demon® OA series, which has been discontinued. The CFR100J2R7 from TE Connectivity represents the current industry standard for equivalent 2.7 Ohm 1W axial resistors.

Q: Are there any compliance differences between the two components?

A: Both components are REACH Unaffected. The CFR100J2R7 additionally provides ROHS3 compliance certification, meeting current regulatory requirements for electronic components in many markets.

Q: What is the difference between carbon composition and carbon film resistors?

A: Both are acceptable for this application. Carbon film resistors (CFR100J2R7) typically offer improved temperature stability (±350ppm/°C specified) and tighter tolerance control compared to carbon composition types.

Q: Is inventory availability a consideration for this substitution?

A: The CFR100J2R7 is in active production with current stock availability. The OA27GKE is obsolete with limited remaining inventory. For new designs and ongoing production, the CFR100J2R7 is the recommended selection.