WW3FT390R Equivalent & Substitute Parts

Part Overview

The WW3FT390R is a 390 Ohm ±1% 3W axial wirewound through-hole resistor manufactured by Stackpole Electronics Inc. This component is designed for applications requiring precision resistance with high power dissipation capability and moisture resistance. The part maintains Active product status with 2755 units in current inventory. Substitute parts are identified when equivalent electrical specifications, mechanical compatibility, and regulatory compliance can be maintained across alternative manufacturers.

Substiute Parts

WW3FT390R

Stackpole Electronics IncIn Stock: 2853WW3FT390R Datasheet

Current PartRFQ

RS02B390R0FE70

Vishay DaleIn Stock: 2652RS02B390R0FE70 Datasheet

MFR RecommendedRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitute parts for the WW3FT390R are qualified based on the following critical parameters:

• Resistance value: 390 Ohms (exact match required)
• Tolerance: ±1% (exact match required)
• Power rating: 3W (exact match required)
• Composition: Wirewound (exact match required)
• Package: Axial configuration (exact match required)
• Temperature coefficient: ±20ppm/°C (exact match required)
• Moisture resistance: Required feature (exact match required)
• Physical dimensions: 0.187" Dia x 0.560" L (exact match required)
• Regulatory compliance: ROHS3 Compliant, REACH Unaffected, EAR99 classification (exact match required)

The RS02B390R0FE70 from Vishay Dale meets all substitution criteria with identical electrical and mechanical specifications.

Parameter Comparison

Engineering Selection Recommendations

Both the WW3FT390R and RS02B390R0FE70 are Active status components with identical electrical and mechanical specifications. Selection between these parts should be based on:

• Inventory availability and lead time requirements
• Supplier preference and procurement agreements
• Operating temperature range requirements: WW3FT390R operates -55°C to 350°C; RS02B390R0FE70 operates -65°C to 250°C
• Cost and volume pricing structures

Both components maintain full ROHS3 compliance and REACH Unaffected status, suitable for regulated applications.

Frequently Asked Questions (FAQ)

Q: Can RS02B390R0FE70 replace WW3FT390R in all applications?

A: Yes, provided the operating temperature range of -65°C to 250°C for the RS02B390R0FE70 is compatible with your application. The WW3FT390R supports extended high-temperature operation to 350°C.

Q: Are the physical dimensions identical?

A: Yes. Both parts are 0.187" diameter by 0.560" length (4.75mm x 14.22mm), ensuring identical PCB footprint and mounting compatibility.

Q: Do both parts meet the same regulatory requirements?

A: Yes. Both WW3FT390R and RS02B390R0FE70 are ROHS3 Compliant, REACH Unaffected, and classified as EAR99.

Q: What is the tolerance specification for these resistors?

A: Both parts maintain ±1% tolerance with ±20ppm/°C temperature coefficient, suitable for precision circuit applications.

Q: Are moisture-resistant properties identical?

A: Yes. Both components feature moisture-resistant construction appropriate for standard industrial and commercial environments.