Equivalent & Substitute Parts for TWW3JR39

Part Overview

The TWW3JR39 is a 390 mOhms ±5% 3W through-hole radial wirewound resistor manufactured by Ohmite. This component is classified as obsolete, which necessitates identification of active equivalent parts for ongoing procurement and design continuity. The part features flame-proof and safety-rated construction suitable for applications requiring reliable low-resistance dissipation in industrial and safety-critical environments.

Substiute Parts

TWW3JR39

OhmiteIn Stock: 997TWW3JR39 Datasheet

Current PartRFQ

TWW3JR39E

OhmiteIn Stock: 767TWW3JR39E Datasheet

Parametric EquivalentRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution of the TWW3JR39 is based on electrical and mechanical parameter equivalence within the Ohmite TWW series. The substitute part TWW3JR39E maintains identical electrical specifications: 390 mOhms resistance value, ±5% tolerance, 3W power rating, and wirewound composition. Mechanical compatibility is preserved through identical radial package configuration and physical dimensions (0.492" L × 0.354" W, 1.024" seated height). Thermal characteristics remain constant with ±400 ppm/°C temperature coefficient and -55°C to 275°C operating range. The substitute part retains flame-proof and safety features required for the application class.

Parameter Comparison

Engineering Selection Recommendations

The TWW3JR39E is the direct parametric equivalent for the obsolete TWW3JR39. Both parts are manufactured by Ohmite within the same TWW series and share identical electrical and mechanical specifications. The primary distinction is product status: TWW3JR39E is active and available for procurement, whereas TWW3JR39 is obsolete. Additionally, TWW3JR39E achieves ROHS3 compliance, whereas the original part is RoHS non-compliant. For new designs or ongoing production requiring this 390 mOhms 3W radial wirewound resistor, TWW3JR39E is the appropriate selection. Both parts maintain equivalent thermal performance, safety ratings, and physical form factor for direct board-level substitution.

Frequently Asked Questions (FAQ)

Q: Can TWW3JR39E be used as a direct replacement for TWW3JR39? A: Yes. Both parts are electrically and mechanically identical with 390 mOhms resistance, ±5% tolerance, 3W power rating, radial package configuration, and identical physical dimensions. Direct substitution is supported without circuit modification.

Q: What is the difference between TWW3JR39 and TWW3JR39E? A: The primary differences are product status and regulatory compliance. TWW3JR39 is obsolete and RoHS non-compliant. TWW3JR39E is active and ROHS3 compliant. Electrical and mechanical parameters are identical.

Q: Are the physical dimensions identical between these parts? A: Yes. Both parts have identical dimensions: 0.492" L × 0.354" W (12.50mm × 9.00mm) with 1.024" (26.00mm) seated height. Board layout and mechanical clearance requirements remain unchanged.

Q: Do both parts operate across the same temperature range? A: Yes. Both parts operate from -55°C to 275°C with identical ±400 ppm/°C temperature coefficient, ensuring equivalent thermal performance in the application.

Q: Is RoHS compliance a consideration for substitution? A: RoHS compliance status depends on application requirements and regional regulations. TWW3JR39E provides ROHS3 compliance, whereas TWW3JR39 does not. For applications subject to RoHS directives, TWW3JR39E is the appropriate selection.