WW3FB1R00 Equivalent & Substitute Parts

Part Overview

The WW3FB1R00 is a 1 Ohm ±1% 3W axial wirewound resistor manufactured by Stackpole Electronics Inc. This through-hole component features moisture-resistant construction and operates across a temperature range of -55°C to 350°C. The part is active in production status with 1044 units currently in stock.

Substitute parts become necessary when the primary component reaches end-of-life, experiences supply constraints, or when design requirements permit alternative specifications that maintain functional compatibility within the circuit application.

Substiute Parts

WW3FB1R00

Stackpole Electronics IncIn Stock: 1116WW3FB1R00 Datasheet

Current PartRFQ

RS02B1R000FE70

Vishay DaleIn Stock: 3614RS02B1R000FE70 Datasheet

DirectRFQ

ALSR031R000FE12

Vishay DaleIn Stock: 2229ALSR031R000FE12 Datasheet

MFR RecommendedRFQ

ALSR051R000FE12

Vishay DaleIn Stock: 1394ALSR051R000FE12 Datasheet

MFR RecommendedRFQ

RS0051R000FE73

Vishay DaleIn Stock: 1827RS0051R000FE73 Datasheet

MFR RecommendedRFQ

UB5C-1RF1

RiedonIn Stock: 2633UB5C-1RF1 Datasheet

MFR RecommendedRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution eligibility is determined by matching the following critical parameters: resistance value (1 Ohm), tolerance (±1%), composition (wirewound), package type (axial), and moisture-resistant construction. The substitute parts are grouped into two categories based on power rating:

Equal Power Rating (3W): RS02B1R000FE70 maintains identical electrical specifications and physical dimensions, differing only in packaging format (Cut Tape vs. Bulk) and operating temperature range (-65°C ~ 250°C vs. -55°C ~ 350°C).

Higher Power Rating (5W): ALSR051R000FE12, RS0051R000FE73, and UB5C-1RF1 provide increased power dissipation capability while maintaining resistance, tolerance, and temperature coefficient specifications. These parts accommodate applications requiring greater thermal headroom.

Parameter Comparison

Engineering Selection Recommendations

Direct Equivalent (Equal Power Rating): RS02B1R000FE70 serves as the primary direct substitute, matching the 3W power specification and all electrical parameters. This part is suitable for applications where the operating temperature range does not exceed 250°C. The higher inventory availability (3579 units) supports supply continuity.

Higher Power Rating Alternatives: ALSR051R000FE12, RS0051R000FE73, and UB5C-1RF1 are suitable for applications where thermal margin is required or where the circuit design permits increased power dissipation capability. All three maintain ROHS3 compliance and the required ±50ppm/°C temperature coefficient.

Temperature Range Consideration: Applications requiring operation above 250°C are limited to the WW3FB1R00 (350°C maximum) or UB5C-1RF1 (250°C maximum). The WW3FB1R00 provides the highest temperature capability among all listed parts.

Compliance Status: All substitute parts maintain ROHS3 compliance, EAR99 export classification, and REACH unaffected or vendor-undefined status, ensuring regulatory alignment with the original component.

Frequently Asked Questions (FAQ)

Q: Can RS02B1R000FE70 replace WW3FB1R00 in all applications? A: RS02B1R000FE70 is electrically and mechanically equivalent for applications operating within -65°C to 250°C. Applications requiring operation above 250°C require the WW3FB1R00 or evaluation of higher-temperature alternatives.

Q: What is the difference between 3W and 5W rated substitutes? A: The 5W-rated parts (ALSR051R000FE12, RS0051R000FE73, UB5C-1RF1) provide increased power dissipation capability and larger physical dimensions. They are suitable for circuits where the 3W rating is marginal or where design margins require additional thermal capacity.

Q: Are the physical dimensions interchangeable between 3W and 5W parts? A: No. The 3W parts measure 0.187" Dia x 0.560" L, while 5W parts measure 0.312" Dia x 0.875" L. PCB layout and mechanical clearance must accommodate the larger 5W package dimensions.

Q: Does UB5C-1RF1 offer advantages beyond power rating? A: UB5C-1RF1 includes additional features: current sense capability, flame-proof construction, pulse withstanding, and safety certification. These features are relevant only if the application requires these specific characteristics.

Q: What packaging format should I select? A: Bulk packaging (WW3FB1R00, ALSR031R000FE12, ALSR051R000FE12, UB5C-1RF1) is suitable for manufacturing environments with automated handling. Cut Tape packaging (RS02B1R000FE70, RS0051R000FE73) is appropriate for lower-volume or manual assembly processes.

Q: Are all substitutes ROHS3 compliant? A: Yes. All listed parts maintain ROHS3 compliance, ensuring compatibility with regulatory requirements for restricted substances.