WW3FT75R0 Equivalent & Substitute Parts

Part Overview

The WW3FT75R0 is a 75 Ohm, 1% tolerance, 3W axial wirewound through-hole resistor manufactured by Stackpole Electronics Inc. This component is designed for applications requiring precision resistance with moisture resistance capabilities and operates across a wide temperature range from -55°C to 350°C. The part is currently in active production status with 882 units in stock. Equivalent and substitute parts are identified to provide procurement flexibility, ensure supply chain continuity, and support design requirements where the primary part may be unavailable or where alternative packaging or supplier options are preferred.

Substiute Parts

WW3FT75R0

Stackpole Electronics IncIn Stock: 953WW3FT75R0 Datasheet

Current PartRFQ

43F75RE

OhmiteIn Stock: 79643F75RE Datasheet

MFR RecommendedRFQ

RS02B75R00FE70

Vishay DaleIn Stock: 1815RS02B75R00FE70 Datasheet

MFR RecommendedRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitute parts for the WW3FT75R0 are qualified based on the following critical parameters that must match or remain compatible with the original specification:

• Resistance value: 75 Ohms (exact match required)
• Tolerance: ±1% (exact match required)
• Power rating: 3W (exact match required)
• Composition: Wirewound (exact match required)
• Package/Case: Axial (exact match required)
• Temperature coefficient: ±20ppm/°C (exact match required)
• Number of terminations: 2 (exact match required)

The identified substitute parts meet all critical electrical and mechanical parameters. Variations in operating temperature range, physical dimensions, packaging format (Tape & Reel vs. Bulk vs. Cut Tape), and moisture resistance features are noted but do not disqualify substitution when the core electrical specifications align.

Parameter Comparison

Engineering Selection Recommendations

All three parts meet the core electrical and mechanical specifications for 75 Ohm, 1% tolerance, 3W axial wirewound resistors. Selection among these parts should be based on the following factors:

WW3FT75R0 (Stackpole Electronics Inc): Primary choice when maximum operating temperature capability (350°C) is required. Offers moisture resistance and ROHS3 compliance. Available in Tape & Reel packaging with 882 units in stock.

43F75RE (Ohmite): Suitable for applications where operating temperature does not exceed 275°C. Meets RoHS compliance requirements. Available in Bulk packaging with 785 units in stock. Physical dimensions are slightly larger (0.220" diameter vs. 0.187" diameter), which may impact PCB layout considerations.

RS02B75R00FE70 (Vishay Dale): Suitable for applications where operating temperature does not exceed 250°C. Offers moisture resistance and ROHS3 compliance. Provides the highest inventory availability (1729 units) and identical physical dimensions to the primary part. Available in Cut Tape packaging.

All parts carry EAR99 ECCN classification and are REACH compliant or unaffected. Selection should prioritize application temperature requirements and packaging format compatibility with assembly processes.

Frequently Asked Questions (FAQ)

Q: Can the 43F75RE substitute for the WW3FT75R0 in all applications?

A: The 43F75RE meets all core electrical specifications (75 Ohms, ±1%, 3W, wirewound, axial). However, its maximum operating temperature is 275°C compared to 350°C for the WW3FT75R0. Substitution is valid only if the application does not require operation above 275°C. Additionally, the 43F75RE has a larger physical diameter (0.220" vs. 0.187"), which may affect PCB layout compatibility.

Q: What is the difference between Tape & Reel, Bulk, and Cut Tape packaging?

A: Tape & Reel (TR) packaging is used for automated assembly processes and provides components on a continuous reel. Bulk packaging consists of loose components suitable for manual assembly or small-volume applications. Cut Tape (CT) packaging provides components on a tape strip cut to specific lengths, offering a middle ground between automated and manual assembly. The electrical and mechanical properties of the resistor remain identical regardless of packaging format.

Q: Are all three parts RoHS compliant?

A: Yes. The WW3FT75R0 and RS02B75R00FE70 are ROHS3 compliant. The 43F75RE is RoHS compliant. All three parts meet environmental compliance requirements for lead-free manufacturing.

Q: Does moisture resistance affect substitution eligibility?

A: The WW3FT75R0 and RS02B75R00FE70 both feature moisture resistance. The 43F75RE does not specify moisture resistance. If the application requires moisture resistance, the 43F75RE is not suitable. For applications where moisture resistance is not a requirement, the 43F75RE remains electrically and mechanically compatible.

Q: Which substitute part has the best inventory availability?

A: The RS02B75R00FE70 has the highest inventory availability with 1729 units in stock, compared to 882 units for the WW3FT75R0 and 785 units for the 43F75RE.

Q: Can physical dimension differences affect circuit performance?

A: The physical dimensions of axial resistors do not affect electrical performance. However, larger dimensions (as with the 43F75RE at 0.220" diameter) may impact PCB layout, component spacing, and thermal management considerations. Verify PCB design constraints before selecting a substitute with different physical dimensions.