OF270JE Equivalent & Substitute Parts

Part Overview

The OF270JE is a 27 Ohm, ±5% tolerance, 0.5W (1/2W) through-hole axial resistor manufactured by Ohmite as part of the Little Demon® OF series. This carbon composition resistor features pulse withstanding capability and is housed in a standard axial package with 0.150" diameter and 0.406" length (3.80mm x 10.30mm). The product is classified as obsolete, making equivalent and substitute parts necessary for ongoing design support and component procurement.

Substiute Parts

OF270JE

OhmiteIn Stock: 889OF270JE Datasheet

Current PartRFQ

OF270KE

OhmiteIn Stock: 939OF270KE Datasheet

MFR RecommendedRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution for the OF270JE is determined by the following critical parameters:

• Resistance Value: Must be 27 Ohms (exact match required)
• Power Rating: Must be 0.5W (1/2W) minimum
• Package Type: Must be axial through-hole configuration
• Physical Dimensions: Must match 0.150" Dia x 0.406" L (3.80mm x 10.30mm)
• Composition: Carbon composition construction
• Termination Count: 2-pin axial leads

The OF270KE qualifies as a direct substitute based on these parameters. While the tolerance specification differs (±10% versus ±5%), the resistance value, power rating, package configuration, physical dimensions, composition, and termination structure remain identical. Both parts are from the same Little Demon® OF series and share equivalent mechanical and electrical compatibility for through-hole PCB applications.

Parameter Comparison

Engineering Selection Recommendations

The OF270KE serves as the manufacturer-recommended substitute for the OF270JE. Both components maintain ROHS3 compliance and MSL 1 rating, ensuring compatibility with modern manufacturing and storage requirements. The primary distinction between these parts is the tolerance specification: the OF270JE provides ±5% tolerance while the OF270KE provides ±10% tolerance. Selection between these parts should be based on the circuit's tolerance requirements. Applications requiring tighter tolerance control (±5%) must use the OF270JE where available; applications with tolerance flexibility (±10%) can utilize the OF270KE. Both parts are classified as obsolete, indicating limited availability through standard distribution channels.

Frequently Asked Questions (FAQ)

Q: Can the OF270KE replace the OF270JE in all applications?

A: The OF270KE is mechanically and electrically compatible with the OF270JE for through-hole PCB mounting. The primary consideration is tolerance: the OF270KE has ±10% tolerance versus the OF270JE's ±5% tolerance. Applications where circuit performance depends on tighter tolerance control require the OF270JE specification.

Q: Are the physical dimensions identical between these parts?

A: Yes. Both the OF270JE and OF270KE share identical physical dimensions of 0.150" diameter by 0.406" length (3.80mm x 10.30mm), ensuring identical PCB footprint and mounting characteristics.

Q: Do both parts meet current compliance standards?

A: Both the OF270JE and OF270KE are ROHS3 compliant and carry MSL 1 (Unlimited) moisture sensitivity rating, meeting current environmental and reliability standards.

Q: What is the significance of the carbon composition construction?

A: Carbon composition construction provides pulse withstanding capability, making these resistors suitable for applications requiring transient surge protection. This characteristic is maintained in both the main part and substitute.

Q: Why are both parts classified as obsolete?

A: Obsolete status indicates these components are no longer in active production by the manufacturer. Procurement should be directed toward available inventory through authorized distributors or equivalent modern alternatives from current product lines.