OF183JE Equivalent & Substitute Parts

Part Overview

The OF183JE is an 18 kOhms ±5% 0.5W axial through-hole resistor manufactured by Ohmite as part of the Little Demon® OF series. This carbon composition resistor features pulse withstanding capability and is designed for applications requiring reliable fixed resistance in compact axial packaging. The part is classified as obsolete, making identification of compatible substitutes essential for ongoing maintenance, repair, and legacy system support.

Substiute Parts

OF183JE

OhmiteIn Stock: 1296OF183JE Datasheet

Current PartRFQ

OF183KE

OhmiteIn Stock: 1649OF183KE Datasheet

MFR RecommendedRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution of the OF183JE is determined by the following critical parameters:

• Resistance Value: Must be 18 kOhms to maintain circuit function
• Power Rating: Must be 0.5W (1/2W) or greater to handle thermal load
• Package Type: Must be axial to ensure mechanical and electrical compatibility with existing PCB layouts and through-hole mounting
• Composition: Carbon composition construction maintains electrical characteristics consistent with the original design
• Physical Dimensions: Axial package dimensions (0.150" Dia x 0.406" L) must be preserved for board fit

The OF183KE qualifies as a direct substitute based on matching resistance value, power rating, package type, composition, and physical dimensions. The tolerance difference (±10% versus ±5%) represents a relaxation of the tolerance specification, which is acceptable in applications where the tighter tolerance of the original part is not a critical design requirement.

Parameter Comparison

Engineering Selection Recommendations

The OF183KE is the manufacturer-recommended substitute for the OF183JE. Both parts are obsolete products from the same Ohmite Little Demon® OF series, ensuring design continuity and electrical compatibility. Both parts maintain ROHS3 compliance and identical moisture sensitivity ratings, supporting regulatory and environmental requirements.

The primary difference is tolerance specification: the OF183KE operates at ±10% tolerance compared to the OF183JE's ±5% tolerance. Selection between these parts depends on circuit tolerance requirements. Applications with strict tolerance specifications should evaluate whether the ±10% tolerance of the substitute part remains within acceptable operating parameters. For applications where tolerance is not a limiting factor, the OF183KE provides equivalent electrical and mechanical performance.

Frequently Asked Questions (FAQ)

Q: Can the OF183KE replace the OF183JE in all applications?

A: The OF183KE matches the OF183JE in resistance value, power rating, package type, physical dimensions, and composition. The tolerance difference (±10% versus ±5%) is the only specification variance. Substitution is appropriate for applications where the circuit design accommodates ±10% tolerance. Applications requiring ±5% tolerance must evaluate whether the relaxed tolerance affects circuit performance.

Q: Are the physical dimensions identical between these parts?

A: Yes. Both the OF183JE and OF183KE share identical axial package dimensions of 0.150" Dia x 0.406" L (3.80mm x 10.30mm), ensuring direct mechanical compatibility with existing through-hole PCB layouts.

Q: Do both parts meet the same compliance standards?

A: Yes. Both the OF183JE and OF183KE are ROHS3 compliant with identical moisture sensitivity levels (MSL 1, Unlimited), supporting equivalent regulatory and environmental requirements.

Q: Why is tolerance specification important for substitution?

A: Tolerance defines the acceptable range of actual resistance values around the nominal 18 kOhms specification. The OF183JE guarantees values between 17.1 kOhms and 18.9 kOhms (±5%), while the OF183KE guarantees values between 16.2 kOhms and 19.8 kOhms (±10%). Applications with tight tolerance requirements must verify that the wider tolerance of the substitute part does not compromise circuit function.

Q: Are both parts still in production?

A: Both the OF183JE and OF183KE are classified as obsolete. Availability is limited to existing inventory. Sourcing decisions should account for long-term availability constraints.