WRF1JB390R Equivalent & Substitute Parts

Part Overview

The WRF1JB390R is a 390 Ohm ±5% 1W axial wirewound resistor manufactured by Stackpole Electronics Inc. This component is classified as obsolete, necessitating identification of equivalent substitute parts for ongoing design support and procurement. The part features flame-proof and moisture-resistant construction suitable for through-hole applications requiring safety-rated wirewound composition.

Substiute Parts

WRF1JB390R

Stackpole Electronics IncIn Stock: 1054WRF1JB390R Datasheet

Current PartRFQ

CB3JB2R00

Stackpole Electronics IncIn Stock: 942CB3JB2R00 Datasheet

MFR RecommendedRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitute parts for the WRF1JB390R must satisfy the following criteria based on allowed electrical and mechanical parameters:

• Resistance value: 390 Ohms ±5%
• Composition: Wirewound
• Package type: Axial through-hole
• Tolerance: ±5%
• Compliance: ROHS3 Compliant, REACH Unaffected
• Features: Flame Proof, Moisture Resistant, Safety construction

The substitute part CB3JB2R00 does not meet the resistance specification (2 Ohms vs. 390 Ohms required) and therefore cannot function as an electrical equivalent for this application. This part represents a different resistance value and is not a valid substitute.

Parameter Comparison

Engineering Selection Recommendations

Based on the provided specifications, CB3JB2R00 cannot serve as an electrical substitute for WRF1JB390R due to fundamental resistance value mismatch (2 Ohms vs. 390 Ohms). While both parts share compatible mechanical packaging, composition, and compliance certifications, the resistance specification is a non-negotiable parameter for circuit functionality.

For applications requiring a 390 Ohm 1W axial wirewound resistor, alternative sources within the Stackpole Electronics WRF series or equivalent 390 Ohm wirewound resistors from other manufacturers meeting ROHS3 compliance and axial packaging requirements should be evaluated.

Frequently Asked Questions (FAQ)

Q: Can CB3JB2R00 replace WRF1JB390R in my circuit?

A: No. The resistance values differ fundamentally (2 Ohms vs. 390 Ohms). Substitution requires matching resistance specifications within the stated tolerance band.

Q: What parameters must match for a valid substitute?

A: Resistance value (390 Ohms ±5%), tolerance (±5%), composition (wirewound), and package type (axial) are mandatory matching criteria. Power rating may be equal or higher; operating temperature range may be equal or extended.

Q: Are there packaging differences between these parts?

A: Both parts use axial through-hole packaging. Physical dimensions differ: WRF1JB390R measures 0.197" Dia x 0.433" L; CB3JB2R00 measures 0.315" Square x 0.866" L. Verify PCB layout compatibility before selection.

Q: What compliance certifications apply?

A: Both parts are ROHS3 Compliant and REACH Unaffected, meeting current regulatory requirements for electronic component procurement.

Q: Why is WRF1JB390R obsolete?

A: Product status reflects manufacturer discontinuation. Procurement should transition to active-status alternatives meeting equivalent electrical and mechanical specifications.