OA271KE Equivalent & Substitute Parts

Part Overview

The OA271KE is a 270 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

OA271KE

OhmiteIn Stock: 1154OA271KE Datasheet

Current PartRFQ

OX271KE

OhmiteIn Stock: 1028OX271KE Datasheet

MFR RecommendedRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution of the OA271KE is determined by the following critical parameters:

• Resistance Value: 270 Ohms (exact match required)
• Tolerance: ±10% (defines acceptable resistance range)
• Power Rating: 1W (minimum thermal dissipation capability)
• Package Type: Axial (physical form factor for through-hole mounting)
• Termination Count: 2 (electrical connection points)
• Features: Pulse withstanding capability (electrical stress handling)

The OX271KE qualifies as a direct substitute because it maintains all critical electrical parameters (resistance, tolerance, power rating) and physical form factor (axial package) while offering enhanced reliability through ceramic composition and moisture resistance.

Parameter Comparison

Engineering Selection Recommendations

The OX271KE is the qualified substitute for the obsolete OA271KE based on the following criteria:

Electrical Equivalence: Both components provide identical resistance (270 Ohms), tolerance (±10%), and power rating (1W), ensuring functional compatibility in circuit applications.

Physical Compatibility: Both components utilize axial package configuration with two terminations, enabling direct mechanical substitution in through-hole PCB layouts. Minor dimensional variations (diameter and length) fall within typical component placement tolerances for axial resistors.

Compliance and Status: The OX271KE is an active product with ROHS3 compliance and REACH unaffected status, providing supply chain continuity and regulatory alignment. The OA271KE's obsolete status necessitates substitution for new production and ongoing support.

Enhanced Reliability: The OX271KE ceramic composition with moisture resistance and specified operating temperature range (-40°C ~ 220°C) provides superior environmental performance compared to the carbon composition OA271KE.

Frequently Asked Questions (FAQ)

Q: Can the OX271KE directly replace the OA271KE in existing designs?

A: Yes. Both components share identical electrical specifications (270 Ohms, ±10%, 1W) and axial package configuration. The OX271KE is electrically and mechanically compatible for direct substitution in through-hole applications.

Q: What are the physical differences between these components?

A: The OA271KE measures 0.236" diameter x 0.591" length, while the OX271KE measures 0.217" diameter x 0.650" length. These dimensional variations are typical among axial resistor designs and do not affect PCB mounting compatibility.

Q: Why is the OA271KE obsolete?

A: The OA271KE is part of the discontinued Little Demon® OA series. The OX271KE from the active OX series provides equivalent electrical performance with modern ceramic composition and enhanced environmental specifications.

Q: Are there compliance differences between the two parts?

A: The OX271KE carries ROHS3 compliance certification, while the OA271KE does not specify this status. Both components are REACH unaffected. For applications requiring ROHS3 compliance, the OX271KE is the appropriate selection.

Q: What is the temperature coefficient difference?

A: The OA271KE does not specify a temperature coefficient. The OX271KE specifies -1000/-1600 ppm/°C with an operating range of -40°C ~ 220°C, providing defined thermal performance characteristics for temperature-sensitive applications.