WW3FT2R00 Equivalent & Substitute Parts

Part Overview

The WW3FT2R00 is a 2 Ohm ±1% 3W axial wirewound through-hole resistor manufactured by Stackpole Electronics Inc. This component is classified as Active product status and is ROHS3 compliant. Substitute parts are necessary when the primary part becomes unavailable, when alternative sourcing reduces lead times, or when design requirements necessitate specific feature sets such as enhanced moisture resistance or pulse withstanding capabilities.

Substiute Parts

WW3FT2R00

Stackpole Electronics IncIn Stock: 2889WW3FT2R00 Datasheet

Current PartRFQ

43F2R0E

OhmiteIn Stock: 104243F2R0E Datasheet

MFR RecommendedRFQ

ALSR032R000FE12

Vishay DaleIn Stock: 1915ALSR032R000FE12 Datasheet

MFR RecommendedRFQ

RS02B2R000FE70

Vishay DaleIn Stock: 1676RS02B2R000FE70 Datasheet

MFR RecommendedRFQ

UB3C-2RF8

RiedonIn Stock: 1986UB3C-2RF8 Datasheet

MFR RecommendedRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution eligibility for the WW3FT2R00 is determined by the following mandatory parameters:

• Resistance value: 2 Ohms (exact match required)
• Tolerance: ±1% (exact match required)
• Power rating: 3W (exact match required)
• Composition: Wirewound (exact match required)
• Package type: Axial (exact match required)
• Temperature coefficient: ±50ppm/°C (exact match required)
• Number of terminations: 2 (exact match required)

All four substitute parts meet these core electrical and mechanical criteria. Variations exist in operating temperature range, physical dimensions, packaging format (Cut Tape vs. Bulk), and additional features such as moisture resistance and pulse withstanding capability.

Parameter Comparison

Engineering Selection Recommendations

All substitute parts maintain full electrical equivalence to the WW3FT2R00 across resistance, tolerance, power rating, and temperature coefficient specifications. Selection among substitutes depends on application-specific constraints:

RS02B2R000FE70 (Vishay Dale) provides the closest dimensional match to the WW3FT2R00, with identical size specifications (0.187" Dia x 0.560" L), moisture resistance, ROHS3 compliance, and REACH Unaffected status. This part is suitable for direct replacement in existing PCB layouts without modification.

ALSR032R000FE12 (Vishay Dale) offers the most compact form factor (0.180" Dia x 0.500" L) while maintaining moisture resistance and ROHS3 compliance. This option is appropriate for space-constrained applications where reduced physical footprint is beneficial.

UB3C-2RF8 (Riedon) provides the smallest overall dimensions (0.157" Dia x 0.350" L) and includes additional features: current sense capability, flame proof construction, pulse withstanding, and safety certification. This part is suitable for applications requiring enhanced reliability and specialized performance characteristics.

43F2R0E (Ohmite) is available in bulk packaging format and maintains RoHS compliance. This part lacks moisture resistance designation and has undefined REACH status, making it suitable only for applications where these attributes are not required.

All substitute parts are Active product status with established inventory availability.

Frequently Asked Questions (FAQ)

Q: Can RS02B2R000FE70 be used as a direct replacement for WW3FT2R00 without PCB modification?

A: Yes. Both parts share identical physical dimensions (0.187" Dia x 0.560" L), axial package type, and electrical specifications (2 Ohms ±1%, 3W, ±50ppm/°C). Both are ROHS3 compliant, moisture resistant, and REACH Unaffected. No PCB layout changes are required.

Q: What is the primary difference between ALSR032R000FE12 and RS02B2R000FE70?

A: Both are Vishay Dale wirewound axial resistors with identical electrical specifications. The primary difference is physical size: ALSR032R000FE12 measures 0.180" Dia x 0.500" L, while RS02B2R000FE70 measures 0.187" Dia x 0.560" L. ALSR032R000FE12 is more compact and suitable for space-constrained designs.

Q: Why does UB3C-2RF8 have a significantly smaller form factor?

A: UB3C-2RF8 is engineered with additional features including current sense capability, flame proof construction, and pulse withstanding characteristics. These design enhancements allow for more compact packaging while maintaining the same 3W power rating and electrical specifications.

Q: Is 43F2R0E suitable for moisture-sensitive applications?

A: No. The 43F2R0E specification does not include moisture resistance designation. For applications requiring moisture resistance, select RS02B2R000FE70, ALSR032R000FE12, or UB3C-2RF8.

Q: What is the operating temperature limitation when substituting with 43F2R0E or UB3C-2RF8?

A: The WW3FT2R00 operates to 350°C maximum. Both 43F2R0E and UB3C-2RF8 are rated to 250°C maximum, and 43F2R0E to 275°C maximum. These substitutes are not suitable for applications requiring operation above 250°C.

Q: Are all substitute parts ROHS3 compliant?

A: No. RS02B2R000FE70, ALSR032R000FE12, and UB3C-2RF8 are ROHS3 compliant. 43F2R0E is RoHS compliant but not specifically ROHS3 certified. For ROHS3 requirement compliance, use RS02B2R000FE70, ALSR032R000FE12, or UB3C-2RF8.

Q: What packaging formats are available among the substitute parts?

A: RS02B2R000FE70 and UB3C-2RF8 are supplied in Cut Tape (CT) format, matching the WW3FT2R00 packaging. ALSR032R000FE12 and 43F2R0E are supplied in Bulk format, requiring alternative handling and storage procedures.