WRF3JB2R00 Equivalent & Substitute Parts

Part Overview

The WRF3JB2R00 is a 2 Ohm ±5% 3W axial wirewound resistor manufactured by Stackpole Electronics Inc. This component is classified as obsolete, making substitute parts necessary for ongoing production and maintenance applications. The part features flame-proof and moisture-resistant construction suitable for safety-critical circuits requiring through-hole axial mounting.

Substiute Parts

WRF3JB2R00

Stackpole Electronics IncIn Stock: 1086WRF3JB2R00 Datasheet

Current PartRFQ

CB3JB2R00

Stackpole Electronics IncIn Stock: 942CB3JB2R00 Datasheet

MFR RecommendedRFQ

FKN2WSJT-73-100R

YAGEOIn Stock: 729FKN2WSJT-73-100R Datasheet

MFR RecommendedRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution eligibility for the WRF3JB2R00 is determined by the following critical parameters:

Primary Matching Criteria:

• Resistance value: 2 Ohms
• Tolerance: ±5%
• Power rating: 3W minimum
• Composition: Wirewound
• Package: Axial through-hole
• Safety features: Flame proof construction

Substitute Classification:

Direct Equivalent (Preferred): CB3JB2R00 matches all primary electrical and mechanical parameters. This part is manufactured by the same supplier (Stackpole Electronics Inc) and maintains identical resistance, tolerance, power rating, and axial package configuration. The CB3JB2R00 is active in production status, providing long-term availability.

Functional Equivalent (Limited Compatibility): FKN2WSJT-73-100R is listed as a substitute but does not meet the primary matching criteria. This YAGEO part has a resistance value of 100 Ohms (not 2 Ohms) and a power rating of 2W (not 3W). This part is not electrically compatible for direct substitution in circuits designed for 2 Ohm 3W operation.

Parameter Comparison

Engineering Selection Recommendations

CB3JB2R00 is the recommended substitute for WRF3JB2R00 applications. This part maintains electrical equivalence across all critical parameters: 2 Ohm resistance, ±5% tolerance, 3W power rating, and axial wirewound construction. The CB3JB2R00 is in active production status, ensuring supply chain continuity. Both parts are ROHS3 compliant and carry identical safety certifications. The CB3JB2R00 offers an extended operating temperature range (-55°C ~ 275°C versus -55°C ~ 225°C), providing additional thermal margin in high-temperature applications.

FKN2WSJT-73-100R is not suitable as a direct substitute due to fundamental electrical parameter mismatches. The 100 Ohm resistance and 2W power rating make this part incompatible with circuits designed for 2 Ohm 3W operation. This part should only be considered if circuit design requirements have changed to accommodate 100 Ohm 2W specifications.

Frequently Asked Questions (FAQ)

Q: Can CB3JB2R00 be used as a direct replacement for WRF3JB2R00?

A: Yes. CB3JB2R00 is electrically and mechanically equivalent. Both parts have 2 Ohm resistance, ±5% tolerance, 3W power rating, and axial package configuration. The CB3JB2R00 is in active production, making it the preferred substitute for obsolete WRF3JB2R00 applications.

Q: Why is FKN2WSJT-73-100R listed as a substitute if it has different electrical parameters?

A: FKN2WSJT-73-100R is listed in the source data but does not meet the electrical requirements for direct substitution. This part has 100 Ohm resistance and 2W power rating, making it incompatible with circuits designed for 2 Ohm 3W operation. This part should only be used if circuit specifications have been redesigned.

Q: Are there physical dimension differences between WRF3JB2R00 and CB3JB2R00?

A: Yes. WRF3JB2R00 has dimensions of 0.197" Dia x 0.630" L (5.00mm x 16.00mm). CB3JB2R00 has dimensions of 0.315" Square x 0.866" L (8.00mm x 22.00mm). Both use axial through-hole mounting, but PCB layout and mechanical clearance must be verified for the larger CB3JB2R00 package.

Q: Do all substitute parts maintain the same safety certifications?

A: CB3JB2R00 maintains identical safety features (Flame Proof, Moisture Resistant, Safety) and RoHS3 compliance. FKN2WSJT-73-100R is also RoHS3 compliant but features Flame Proof and Fusible construction rather than Moisture Resistant design.

Q: What is the temperature coefficient difference between WRF3JB2R00 and CB3JB2R00?

A: WRF3JB2R00 has a temperature coefficient of -80/+900ppm/°C. CB3JB2R00 has a temperature coefficient of ±500ppm/°C. CB3JB2R00 provides more stable resistance across temperature variations.