UB3C-68RF1 Equivalent & Substitute Parts

Part Overview

The UB3C-68RF1 is a 68 Ohm ±1% 3W axial wirewound resistor manufactured by Riedon. This through-hole component is designed for current sensing applications and features flame-proof, moisture-resistant, and pulse-withstanding characteristics. The part is Active status with 1093 units in stock. Substitute parts are identified when equivalent electrical specifications, mechanical compatibility, and compliance certifications align with the original component requirements.

Substiute Parts

UB3C-68RF1

RiedonIn Stock: 1128UB3C-68RF1 Datasheet

Current PartRFQ

43F68RE

OhmiteIn Stock: 254643F68RE Datasheet

MFR RecommendedRFQ

WW3FT68R0

Stackpole Electronics IncIn Stock: 7687WW3FT68R0 Datasheet

MFR RecommendedRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitute parts for the UB3C-68RF1 are qualified based on the following critical parameters:

• Resistance value: 68 Ohms
• Tolerance: ±1%
• Power rating: 3W
• Composition: Wirewound
• Package: Axial through-hole
• Temperature coefficient: ±20ppm/°C
• Termination count: 2
• Compliance: RoHS and REACH status

The identified substitutes (43F68RE and WW3FT68R0) meet all core electrical specifications and mechanical compatibility requirements. Variations in physical dimensions, operating temperature range, and feature sets are noted but do not preclude substitution when application constraints permit.

Parameter Comparison

Engineering Selection Recommendations

All three parts—UB3C-68RF1, 43F68RE, and WW3FT68R0—share identical core electrical specifications (68 Ohms, ±1%, 3W, wirewound, axial package). Selection between these parts is determined by application-specific constraints:

UB3C-68RF1 (Riedon): Primary choice when current sensing, flame-proof, and pulse-withstanding features are required. Operating temperature limited to 250°C. ROHS3 compliant. Smallest physical footprint (4.00mm diameter).

43F68RE (Ohmite): Suitable for applications requiring extended operating temperature to 275°C. RoHS compliant. Larger physical dimensions (5.60mm diameter) may impact PCB layout. Bulk packaging available.

WW3FT68R0 (Stackpole): Optimal for high-temperature applications up to 350°C. Moisture-resistant feature. ROHS3 compliant. Available in Cut Tape packaging for automated assembly. Intermediate physical dimensions (4.75mm diameter).

Physical dimension differences require verification against PCB layout constraints and mechanical clearance requirements before substitution.

Frequently Asked Questions (FAQ)

Q: Can 43F68RE replace UB3C-68RF1 in all applications? A: Electrical substitution is valid based on matching resistance, tolerance, power rating, and temperature coefficient. Physical dimensions differ (5.60mm vs 4.00mm diameter), requiring PCB layout verification. Operating temperature range extends to 275°C versus 250°C on the original part.

Q: What is the primary difference between WW3FT68R0 and the other substitutes? A: WW3FT68R0 supports operating temperatures to 350°C and includes moisture-resistant features. Physical dimensions are intermediate (4.75mm diameter). Moisture Sensitivity Level is Not Applicable, differing from the other parts rated MSL 1.

Q: Are all three parts RoHS compliant? A: UB3C-68RF1 and WW3FT68R0 are ROHS3 compliant. 43F68RE is RoHS compliant. Both certifications satisfy RoHS requirements; ROHS3 represents the current standard.

Q: Does packaging format affect electrical performance? A: No. Bulk and Cut Tape (CT) packaging formats do not affect component electrical or mechanical specifications. Selection depends on assembly process requirements and inventory management.

Q: Can these parts be used interchangeably in current sensing circuits? A: Yes, provided operating temperature and physical space constraints are satisfied. All parts share identical resistance, tolerance, power rating, and temperature coefficient specifications required for current sensing applications.

Q: What should be verified before substituting WW3FT68R0 for UB3C-68RF1? A: Confirm PCB layout accommodates the larger 4.75mm diameter. Verify that the extended operating temperature range to 350°C does not introduce thermal management changes. Confirm moisture-resistant feature is compatible with application environment.