OF203JE Equivalent & Substitute Parts Reference

Part Overview

The OF203JE is a 20 kOhms ±5% 0.5W 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 designed for axial lead applications. The product is classified as obsolete, making equivalent and substitute parts necessary for ongoing circuit maintenance, repair, and legacy system support.

Substiute Parts

OF203JE

OhmiteIn Stock: 8815OF203JE Datasheet

Current PartRFQ

OF183KE

OhmiteIn Stock: 1649OF183KE Datasheet

MFR RecommendedRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution for the OF203JE is determined by the following critical parameters:

• Resistance Value: The substitute must operate within the circuit's tolerance band. The OF203JE specifies 20 kOhms ±5%, establishing a nominal range of 19–21 kOhms.
• Power Rating: The substitute must support the same 0.5W (1/2W) power dissipation requirement.
• Package Type: The substitute must use axial lead configuration to ensure mechanical and electrical compatibility with existing PCB layouts and through-hole mounting.
• Composition: Carbon composition construction maintains consistency with the original design intent and environmental performance characteristics.
• Physical Dimensions: The substitute must match the 0.150" Dia x 0.406" L footprint to ensure fit within constrained board spaces.
• Compliance: RoHS3 compliance and MSL 1 rating ensure regulatory and environmental compatibility.

The OF183KE is identified as a manufacturer-recommended substitute. While it differs in nominal resistance (18 kOhms) and tolerance (±10%), it remains functionally compatible within defined circuit parameters when resistance variation is acceptable.

Parameter Comparison

Engineering Selection Recommendations

Both the OF203JE and OF183KE are obsolete products within the Little Demon® OF series. Selection between these parts depends on circuit tolerance requirements:

• OF203JE: Use when the circuit design specifies 20 kOhms ±5% and the tighter tolerance is functionally necessary.
• OF183KE: Use as a substitute when circuit analysis confirms that 18 kOhms ±10% (range: 16.2–19.8 kOhms) satisfies the application requirements. The 2 kOhm nominal difference and wider tolerance band must be evaluated against circuit performance specifications.

Both parts maintain identical RoHS3 compliance, MSL 1 rating, power dissipation capability, and physical form factor, ensuring regulatory and mechanical compatibility. The decision between them is driven by circuit-level tolerance analysis rather than environmental or compliance considerations.

Frequently Asked Questions (FAQ)

Q: Can OF183KE directly replace OF203JE in any circuit?

A: Direct replacement depends on circuit tolerance requirements. The OF183KE has a lower nominal resistance (18 kOhms vs. 20 kOhms) and wider tolerance (±10% vs. ±5%). Circuit analysis must confirm that the resulting resistance range (16.2–19.8 kOhms for OF183KE) does not degrade performance. Direct substitution is not universal.

Q: Are the physical dimensions identical between these parts?

A: Yes. Both OF203JE and OF183KE share identical axial dimensions of 0.150" Dia x 0.406" L (3.80mm x 10.30mm), ensuring mechanical compatibility with existing through-hole PCB layouts.

Q: Do both parts meet current regulatory requirements?

A: Both parts are ROHS3 compliant and carry MSL 1 (Unlimited) moisture sensitivity ratings, meeting current environmental and regulatory standards for component selection.

Q: Why is OF183KE listed as a manufacturer-recommended substitute if the resistance differs?

A: Ohmite identifies OF183KE as a substitute based on functional equivalence within acceptable tolerance bands for typical applications. However, circuit-specific tolerance requirements must be verified before implementation.

Q: Are there any performance differences between carbon composition construction in these parts?

A: Both parts use identical carbon composition construction and pulse withstanding features. Performance differences are limited to the specified resistance and tolerance parameters.