OF301JE Equivalent & Substitute Parts

Part Overview

The OF301JE is a 300 Ohms ±5% 0.5W through-hole resistor manufactured by Ohmite in the Little Demon® OF series. This axial carbon composition resistor features pulse withstanding capability and is designed for applications requiring reliable fixed resistance in compact form factors. The part is classified as obsolete, making identification of functionally equivalent alternatives essential for ongoing system support, maintenance, and component procurement.

Substiute Parts

OF301JE

OhmiteIn Stock: 882OF301JE Datasheet

Current PartRFQ

OF271KE

OhmiteIn Stock: 2016OF271KE Datasheet

MFR RecommendedRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution for the OF301JE is determined by the following critical parameters:

• Resistance Value: The substitute must provide 300 Ohms nominal resistance. The OF271KE provides 270 Ohms, representing a 10% deviation from the original specification.
• Tolerance: The original part specifies ±5% tolerance. The substitute OF271KE operates at ±10% tolerance, which is wider and may impact circuit performance in precision applications.
• Power Rating: Both parts must support 0.5W (1/2W) continuous power dissipation.
• Package Type: Axial through-hole configuration with matching physical dimensions (0.150" Dia x 0.406" L) ensures mechanical and electrical compatibility on printed circuit boards.
• Composition & Features: Carbon composition construction with pulse withstanding capability must be maintained for equivalent performance under transient conditions.
• Compliance: RoHS3 compliance and MSL 1 rating ensure environmental and moisture handling compatibility.

The OF271KE qualifies as a substitute based on matching power rating, package type, physical dimensions, composition, and compliance certifications. However, the 10% resistance tolerance and 30 Ohm nominal difference require circuit-level evaluation.

Parameter Comparison

Engineering Selection Recommendations

The OF271KE serves as a functional substitute for the OF301JE based on matching power rating, axial package configuration, physical dimensions, carbon composition construction, pulse withstanding capability, and RoHS3 compliance. Both parts belong to the same Little Demon® OF series and maintain equivalent moisture sensitivity ratings.

Selection of the OF271KE requires consideration of the 30 Ohm nominal resistance difference (270 Ohms versus 300 Ohms) and the wider ±10% tolerance band compared to the original ±5% specification. Applications with strict resistance requirements or tight circuit tolerances must evaluate whether this 10% nominal deviation and increased tolerance band remain within acceptable operating parameters.

Both parts maintain ROHS3 compliance and unlimited moisture sensitivity ratings, ensuring compatibility with modern manufacturing and environmental standards.

Frequently Asked Questions (FAQ)

Q: Can OF271KE directly replace OF301JE in all applications?

A: The OF271KE matches the power rating, package type, physical dimensions, and composition of the OF301JE. However, the 30 Ohm nominal difference and ±10% tolerance (versus ±5%) may affect circuit performance in applications requiring precise resistance values. Circuit-level analysis is necessary to confirm compatibility.

Q: What are the key differences between these parts?

A: The primary differences are resistance value (300 Ohms versus 270 Ohms) and tolerance specification (±5% versus ±10%). Both parts share identical power ratings, package types, physical dimensions, composition, and compliance certifications.

Q: Are both parts physically interchangeable?

A: Yes. Both parts feature identical axial package configurations with matching dimensions (0.150" Dia x 0.406" L). They mount identically on through-hole printed circuit boards.

Q: Do both parts meet current environmental standards?

A: Yes. Both OF301JE and OF271KE are ROHS3 compliant with MSL 1 (Unlimited) moisture sensitivity ratings, meeting current environmental and manufacturing requirements.

Q: Why is the OF301JE listed as obsolete?

A: The OF301JE is classified as obsolete, indicating it is no longer in active production. The OF271KE, also obsolete, represents a historical equivalent from the same manufacturer series.