WRF2JB2R00 Equivalent & Substitute Parts

Part Overview

The WRF2JB2R00 is a 2 Ohm ±5% 2W axial wirewound resistor manufactured by Stackpole Electronics Inc. This component is classified as obsolete, necessitating identification of active equivalent parts for ongoing production and maintenance applications. The part features flame-proof and moisture-resistant construction suitable for industrial and safety-critical circuits. Substitute parts must maintain electrical performance within the specified resistance, tolerance, and power rating parameters while meeting applicable compliance standards.

Substiute Parts

WRF2JB2R00

Stackpole Electronics IncIn Stock: 633WRF2JB2R00 Datasheet

Current PartRFQ

CB2JB2R00

Stackpole Electronics IncIn Stock: 818CB2JB2R00 Datasheet

DirectRFQ

PNP300JR-73-0R18

YAGEOIn Stock: 25553PNP300JR-73-0R18 Datasheet

MFR RecommendedRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitute parts for the WRF2JB2R00 are evaluated based on the following critical parameters:

Electrical Compatibility: Resistance value (2 Ohms), tolerance (±5%), and power rating must be maintained or exceeded. Wirewound composition is required for thermal stability and safety applications.

Mechanical Compatibility: Axial package type is mandatory for board layout and assembly compatibility.

Environmental & Compliance: Operating temperature range, RoHS3 compliance, and safety features (flame-proof or flame-retardant) must be present.

Product Status: Active parts are prioritized over obsolete designations to ensure long-term availability.

Two substitute categories are identified:

1. Direct Electrical & Mechanical Equivalent: CB2JB2R00 (Stackpole Electronics Inc) — identical electrical specifications with extended operating temperature range and improved temperature coefficient.

2. Functional Equivalent with Parameter Variance: PNP300JR-73-0R18 (YAGEO) — different resistance value (180 mOhms vs. 2 Ohms) and higher power rating (3W vs. 2W); suitable only for applications where the lower resistance value is acceptable.

Parameter Comparison

Engineering Selection Recommendations

Primary Substitute: CB2JB2R00 is the recommended direct replacement for WRF2JB2R00. Both parts are manufactured by Stackpole Electronics Inc, maintain identical electrical specifications (2 Ohms ±5% 2W), and are wirewound axial resistors. CB2JB2R00 offers superior performance with an extended operating temperature range (-55°C ~ 275°C versus -55°C ~ 200°C) and improved temperature coefficient stability (±200 ppm/°C versus -80/+900 ppm/°C). Both parts are ROHS3 compliant and feature flame-proof and moisture-resistant construction. CB2JB2R00 is currently in active production with 777 units in stock.

Alternative Substitute: PNP300JR-73-0R18 (YAGEO) is an active wirewound axial resistor with ROHS3 compliance. However, this part has a significantly different resistance value (180 mOhms versus 2 Ohms) and higher power rating (3W versus 2W). This part is suitable only for applications where the lower resistance value and higher power capacity are functionally acceptable. The operating temperature range (-40°C ~ 200°C) is compatible with the original specification. PNP300JR-73-0R18 has high inventory availability (25,452 units in stock).

Frequently Asked Questions (FAQ)

Q: Can CB2JB2R00 be used as a direct drop-in replacement for WRF2JB2R00?

A: Yes. CB2JB2R00 maintains the same electrical specifications (2 Ohms ±5% 2W wirewound) and axial package configuration. The primary difference is physical size (6.40mm x 18.00mm versus 5.00mm x 16.00mm), which may require PCB layout verification. CB2JB2R00 offers improved temperature coefficient and extended operating temperature range, making it functionally superior.

Q: Why is PNP300JR-73-0R18 listed as a substitute if the resistance value differs?

A: PNP300JR-73-0R18 is listed as a functional alternative for applications where a lower resistance value (180 mOhms) is acceptable. This part is not a direct electrical equivalent and should only be selected if circuit design permits the resistance change. The higher power rating (3W) provides additional thermal margin.

Q: Are all substitute parts RoHS3 compliant?

A: Yes. Both CB2JB2R00 and PNP300JR-73-0R18 are ROHS3 compliant, matching the compliance status of the original WRF2JB2R00.

Q: What is the impact of physical size differences between substitute parts?

A: CB2JB2R00 is slightly larger (6.40mm x 18.00mm) than WRF2JB2R00 (5.00mm x 16.00mm), while PNP300JR-73-0R18 is smaller (4.60mm x 11.50mm). Physical size differences may affect PCB layout, thermal dissipation characteristics, and mechanical mounting. Verify board space and thermal design requirements before selection.

Q: Which substitute part has the best long-term availability?

A: PNP300JR-73-0R18 has the highest current inventory (25,452 units), followed by CB2JB2R00 (777 units). For applications requiring identical electrical performance, CB2JB2R00 is the preferred choice despite lower stock levels, as it is a direct equivalent manufactured by the original supplier.