Ohmite 20J40R Equivalent & Substitute Parts

Part Overview

The Ohmite 20J40R is a 40 Ohm, 5% tolerance, 10W through-hole axial wirewound resistor with flame retardant coating and safety features. This component is classified as Active product status and is designed for applications requiring reliable power dissipation in axial package configurations. Substitute parts are identified when electrical specifications, mechanical dimensions, and packaging compatibility align with the original component requirements.

Substiute Parts

20J40R

OhmiteIn Stock: 107620J40R Datasheet

Current PartRFQ

20J40RE

OhmiteIn Stock: 233420J40RE Datasheet

DirectRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitute parts for the 20J40R are identified based on strict electrical and mechanical parameter matching. The following criteria determine substitution eligibility:

• Resistance value: 40 Ohms (exact match required)
• Tolerance: ±5% (exact match required)
• Power rating: 10W (exact match required)
• Composition: Wirewound (exact match required)
• Package: 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 20J40RE meets all substitution criteria and is classified as a direct equivalent.

Parameter Comparison

Engineering Selection Recommendations

Both the 20J40R and 20J40RE are Active status components from Ohmite's Series 20 wirewound resistor line. The primary distinction between these parts is RoHS compliance status. The 20J40R is RoHS non-compliant, while the 20J40RE is ROHS3 compliant. Both components share identical electrical specifications, mechanical dimensions, and safety features. Selection between these parts should be based on regulatory requirements applicable to the end application. Applications requiring ROHS3 compliance should specify the 20J40RE. Applications without RoHS compliance requirements may use either part. Both components maintain REACH Unaffected status and EAR99 export classification.

Frequently Asked Questions (FAQ)

Q: Can the 20J40RE replace the 20J40R in all applications?

A: Yes, the 20J40RE is electrically and mechanically identical to the 20J40R. The primary difference is RoHS compliance status. If your application does not require RoHS compliance, either part is suitable. If RoHS compliance is required, the 20J40RE must be used.

Q: Are the physical dimensions identical between 20J40R and 20J40RE?

A: Yes. Both parts measure 0.394" diameter by 1.858" length (10.00mm x 47.20mm) and use identical axial packaging. PCB layout and mechanical mounting are interchangeable.

Q: What is the difference in packaging between these parts?

A: The 20J40R is supplied in standard packaging, while the 20J40RE is supplied in bulk packaging. This affects order quantities and handling but does not impact component performance or specifications.

Q: Are there any thermal or electrical performance differences?

A: No. Both parts have identical resistance values (40 Ohms), tolerance (±5%), power rating (10W), temperature coefficient (±30ppm/°C), and composition (wirewound with flame retardant coating).

Q: Which part should I specify for new designs?

A: For new designs, specify the 20J40RE if RoHS compliance is a requirement. Both parts are Active status and suitable for production use.