WW3FT330R Equivalent & Substitute Parts

Part Overview

The WW3FT330R is a 330 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 and high temperature stability. The part is currently in active production status with 890 units in stock. Substitute parts are identified when equivalent electrical specifications, mechanical compatibility, and compliance certifications align with the original component requirements.

Substiute Parts

WW3FT330R

Stackpole Electronics IncIn Stock: 924WW3FT330R Datasheet

Current PartRFQ

43F330E

OhmiteIn Stock: 94543F330E Datasheet

MFR RecommendedRFQ

RS02B330R0FE70

Vishay DaleIn Stock: 4914RS02B330R0FE70 Datasheet

MFR RecommendedRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitute parts for the WW3FT330R are qualified based on the following criteria:

Electrical Parameters: Resistance value of 330 Ohms, tolerance of ±1%, and power rating of 3W must be maintained.

Mechanical Compatibility: Axial package configuration with identical physical dimensions (0.187" Dia x 0.560" L) ensures direct board-level compatibility.

Material Composition: Wirewound construction with moisture-resistant properties preserves performance characteristics in target applications.

Temperature Performance: Temperature coefficient of ±20ppm/°C and operating temperature range capability must be equivalent or superior.

Compliance: RoHS3 compliance status is required for regulatory alignment with the original component.

Parameter Comparison

Engineering Selection Recommendations

RS02B330R0FE70 (Vishay Dale) qualifies as a direct substitute for the WW3FT330R. Both components share identical electrical specifications (330 Ohms, ±1%, 3W), wirewound composition, moisture-resistant properties, and ROHS3 compliance. Physical dimensions are equivalent, ensuring mechanical interchangeability. The operating temperature range of -65°C ~ 250°C on the Vishay Dale part covers the lower end of the Stackpole specification but does not extend to the upper 350°C limit. This part is suitable for applications within the -65°C ~ 250°C window.

43F330E (Ohmite) meets the core electrical requirements (330 Ohms, ±1%, 3W) and axial package configuration. However, this part is RoHS non-compliant, which may conflict with regulatory requirements for new designs or applications subject to RoHS directives. Additionally, the silicone composition differs from the wirewound construction of the original part, and critical thermal specifications are not provided. This part should be evaluated only when RoHS compliance is not a requirement and thermal performance data is confirmed through the manufacturer.

Frequently Asked Questions (FAQ)

Q: Can RS02B330R0FE70 be used in applications requiring operation above 250°C?

A: No. The RS02B330R0FE70 has a maximum operating temperature of 250°C, which is below the WW3FT330R specification of 350°C. For high-temperature applications exceeding 250°C, the original WW3FT330R or equivalent parts with matching upper temperature limits must be used.

Q: Is 43F330E suitable for RoHS-regulated applications?

A: No. The 43F330E is RoHS non-compliant. Applications subject to RoHS directives (EU 2011/65/EU or equivalent) require components with ROHS3 compliance status. The WW3FT330R and RS02B330R0FE70 both meet this requirement.

Q: Are the physical dimensions identical across all three parts?

A: The WW3FT330R and RS02B330R0FE70 share identical dimensions (0.187" Dia x 0.560" L). The 43F330E dimensions are not specified in the provided data. Verify physical dimensions with the manufacturer before substitution.

Q: What is the difference between wirewound and silicone composition?

A: Wirewound resistors use wire wound around a ceramic core, providing precise tolerance and stable temperature performance. Silicone composition refers to a different construction method. The WW3FT330R and RS02B330R0FE70 are wirewound; the 43F330E uses silicone construction. Composition differences may affect thermal stability and frequency response characteristics.

Q: Does packaging format affect electrical performance?

A: No. Tape & Reel (TR), Cut Tape (CT), and Bulk packaging formats are logistics and handling specifications only. They do not affect the electrical or mechanical performance of the component itself. Selection should be based on assembly process requirements and inventory management.

Q: Can I substitute based on resistance and power rating alone?

A: No. Substitution requires alignment of multiple parameters: resistance value, tolerance, power rating, composition type, package configuration, temperature specifications, and compliance certifications. Partial matches may result in performance degradation or regulatory non-compliance.