OF300JE Equivalent & Substitute Parts

Part Overview

The OF300JE is a 30 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 performance in compact form factors. The product is currently obsolete, making equivalent substitute parts necessary for ongoing maintenance, repair, and legacy system support.

Substiute Parts

OF300JE

OhmiteIn Stock: 1044OF300JE Datasheet

Current PartRFQ

OF270KE

OhmiteIn Stock: 939OF270KE Datasheet

MFR RecommendedRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution for the OF300JE is determined by the following critical parameters:

• Resistance value within acceptable circuit tolerance
• Power rating equal to or greater than 0.5W
• Axial through-hole package configuration
• Carbon composition construction
• Pulse withstanding capability
• Physical dimensions compatible with PCB layout (0.150" Dia x 0.406" L)
• RoHS3 compliance for regulatory alignment

The OF270KE qualifies as a substitute based on matching power rating, package type, composition, pulse withstanding feature, physical dimensions, and RoHS compliance. The resistance value of 27 Ohms represents a 10% deviation from the original 30 Ohms specification, which falls within acceptable substitution parameters for carbon composition resistor applications where tolerance stackup is managed in circuit design.

Parameter Comparison

Engineering Selection Recommendations

The OF270KE serves as a direct substitute for the obsolete OF300JE in applications where the 10% resistance deviation (27 Ohms vs. 30 Ohms) is acceptable within circuit tolerance requirements. Both components maintain identical power ratings, physical dimensions, and package configurations, ensuring mechanical and thermal compatibility in existing PCB designs.

Both parts are ROHS3 compliant and carry unlimited moisture sensitivity classification, meeting modern regulatory requirements for electronic component procurement. The carbon composition construction and pulse withstanding features are preserved across both parts, maintaining performance characteristics for applications requiring these specific attributes.

Frequently Asked Questions (FAQ)

Q: Can OF270KE be used as a direct replacement for OF300JE without circuit modification?

A: The OF270KE is mechanically and thermally compatible with identical package dimensions and power ratings. Electrical compatibility depends on circuit tolerance requirements. The 10% resistance difference (27 Ohms vs. 30 Ohms) must be evaluated against circuit design specifications and tolerance stackup calculations.

Q: Are the physical dimensions identical between OF300JE and OF270KE?

A: Yes. Both components share identical axial package dimensions of 0.150" Dia x 0.406" L (3.80mm x 10.30mm), ensuring compatibility with existing PCB layouts and through-hole mounting patterns.

Q: Do both parts meet current RoHS compliance requirements?

A: Yes. Both OF300JE and OF270KE are ROHS3 compliant and carry MSL 1 (Unlimited) moisture sensitivity classification, meeting current regulatory standards for electronic component procurement.

Q: What is the primary difference between these two resistors?

A: The primary differences are resistance value (30 Ohms vs. 27 Ohms) and tolerance specification (±5% vs. ±10%). Both maintain identical power ratings, package types, composition, and pulse withstanding capabilities.

Q: Are both parts from the same manufacturer series?

A: Yes. Both OF300JE and OF270KE are manufactured by Ohmite and belong to the Little Demon® OF series, ensuring consistent construction quality and performance characteristics.