Ohmite 20J18R Equivalent & Substitute Parts

Part Overview

The Ohmite 20J18R is an 18 Ohm, 5% tolerance, 10W through-hole axial wirewound resistor with flame retardant coating and safety features. This component is designed for applications requiring reliable power dissipation in compact axial form factors. The part is currently active in production. Substitute parts are identified to provide alternative sourcing options when the primary part number is unavailable or when specific compliance requirements must be met.

Substiute Parts

20J18R

OhmiteIn Stock: 74120J18R Datasheet

Current PartRFQ

20J18RE

OhmiteIn Stock: 101520J18RE Datasheet

Parametric EquivalentRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution eligibility for the Ohmite 20J18R is determined by the following critical parameters:

• Resistance value: 18 Ohms (exact match required)
• Tolerance: ±5% (exact match required)
• Power rating: 10W (exact match required)
• Composition: Wirewound (exact match required)
• Package type: Axial (exact match required)
• Physical dimensions: 0.394" Dia x 1.858" L (exact match required)
• Temperature coefficient: ±30ppm/°C (exact match required)
• Features: Flame retardant coating and safety features (exact match required)

The Ohmite 20J18RE meets all these criteria and qualifies as a parametric equivalent substitute part.

Parameter Comparison

Engineering Selection Recommendations

Both the Ohmite 20J18R and 20J18RE are active production parts from the same manufacturer and series. All electrical and mechanical parameters are identical, ensuring direct functional interchangeability in circuit applications.

The primary distinction between these parts is compliance status. The 20J18RE is RoHS Compliant with MSL 1 (Unlimited), while the 20J18R is RoHS non-compliant. Selection between these parts should be based on the regulatory and environmental requirements of the end application. For applications subject to RoHS directives or requiring RoHS-compliant components, the 20J18RE is the appropriate choice. For applications without RoHS requirements, either part may be selected based on availability and inventory considerations.

Frequently Asked Questions (FAQ)

Q: Can the 20J18RE be used as a direct replacement for the 20J18R?

A: Yes. The 20J18RE is a parametric equivalent with identical electrical specifications (18 Ohms, ±5%, 10W), composition (wirewound), features (flame retardant coating, safety), temperature coefficient (±30ppm/°C), and physical dimensions (0.394" Dia x 1.858" L). Both parts are axial package type with two terminations. Direct substitution is electrically and mechanically valid.

Q: What is the difference between these two part numbers?

A: The primary difference is RoHS compliance status. The 20J18RE is RoHS Compliant with MSL 1 (Unlimited), while the 20J18R is RoHS non-compliant. All other specifications are identical.

Q: Which part should I specify for a new design?

A: Selection depends on regulatory requirements. If RoHS compliance is required, specify the 20J18RE. If RoHS compliance is not a requirement, either part may be used based on availability.

Q: Are the physical dimensions identical?

A: Yes. Both parts have identical dimensions of 0.394" Dia x 1.858" L (10.00mm x 47.20mm) and are packaged as axial components. They are mechanically interchangeable on PCBs and in through-hole applications.

Q: Can I mix these parts in the same production batch?

A: Yes, from an electrical and mechanical standpoint. However, if RoHS compliance documentation is required for the final product, ensure that all components in the assembly meet the applicable compliance requirements.