UB3C-680RF8 Equivalent & Substitute Parts

Part Overview

The UB3C-680RF8 is a 680 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 currently active in production with 819 units in stock. Equivalent and substitute parts are identified when component availability is limited, supply chain disruptions occur, or design flexibility permits alternative sourcing while maintaining electrical and mechanical compatibility.

Substiute Parts

UB3C-680RF8

RiedonIn Stock: 859UB3C-680RF8 Datasheet

Current PartRFQ

43F680E

OhmiteIn Stock: 100243F680E Datasheet

MFR RecommendedRFQ

WW3FT680R

Stackpole Electronics IncIn Stock: 6592WW3FT680R Datasheet

MFR RecommendedRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitute parts for the UB3C-680RF8 are qualified based on the following electrical and mechanical parameters:

• Resistance value: 680 Ohms
• Tolerance: ±1%
• Power rating: 3W
• Composition: Wirewound
• Package configuration: Axial through-hole
• Temperature coefficient: ±20ppm/°C
• Termination count: 2

All identified substitutes maintain these core specifications. Variations in physical dimensions, operating temperature range, and packaging format (Tape & Reel, Bulk, Cut Tape) do not affect electrical functionality within the specified operating conditions of the main part.

Parameter Comparison

Engineering Selection Recommendations

All three parts meet the core electrical specifications for 680 Ohm ±1% 3W wirewound axial resistors. Selection between the UB3C-680RF8, 43F680E, and WW3FT680R should be based on the following factors:

UB3C-680RF8 (Riedon): ROHS3 compliant with REACH unaffected status. Smallest physical footprint (4.00mm diameter x 8.90mm length). Suitable for space-constrained applications. Operating temperature range -55°C to 250°C. Packaged in Tape & Reel format.

43F680E (Ohmite): RoHS compliant with vendor-undefined REACH status. Largest physical footprint (5.60mm diameter x 15.10mm length). Extended operating temperature range to 275°C. Available in Bulk packaging. Suitable for applications requiring higher temperature margin.

WW3FT680R (Stackpole Electronics Inc): ROHS3 compliant with REACH unaffected status. Intermediate physical footprint (4.75mm diameter x 14.22mm length). Highest inventory availability (6571 units). Extended operating temperature range to 350°C. Moisture-resistant feature. Packaged in Cut Tape format. Not applicable for moisture sensitivity level.

All parts are active products with established supply chains. Selection should prioritize application-specific requirements including PCB layout constraints, thermal environment, and packaging logistics.

Frequently Asked Questions (FAQ)

Q: Can the 43F680E replace the UB3C-680RF8 in all applications?

A: Electrical substitution is valid. The 43F680E maintains identical resistance, tolerance, power rating, and temperature coefficient. Physical dimensions differ (5.60mm x 15.10mm versus 4.00mm x 8.90mm), requiring verification of PCB layout clearance. Operating temperature range extends to 275°C, providing additional thermal margin. REACH compliance status differs (vendor undefined versus unaffected).

Q: What are the physical dimension differences between substitutes?

A: UB3C-680RF8: 4.00mm diameter x 8.90mm length. 43F680E: 5.60mm diameter x 15.10mm length. WW3FT680R: 4.75mm diameter x 14.22mm length. Larger dimensions may require PCB redesign or component repositioning in space-constrained designs.

Q: Which substitute offers the best supply availability?

A: WW3FT680R (Stackpole) has the highest inventory at 6571 units, compared to 963 units for 43F680E and 819 units for UB3C-680RF8.

Q: Are all substitutes RoHS compliant?

A: Yes. UB3C-680RF8 and WW3FT680R are ROHS3 compliant. 43F680E is RoHS compliant. All meet regulatory requirements for lead-free manufacturing.

Q: What is the difference in operating temperature range?

A: UB3C-680RF8: -55°C to 250°C. 43F680E: -55°C to 275°C. WW3FT680R: -55°C to 350°C. Applications operating above 250°C require 43F680E or WW3FT680R.

Q: Does packaging format affect electrical performance?

A: No. Tape & Reel (TR), Bulk, and Cut Tape (CT) formats are logistics and assembly considerations only. Electrical characteristics remain identical across packaging formats.

Q: Is the WW3FT680R moisture-resistant feature significant for substitution?

A: The moisture-resistant feature of WW3FT680R provides additional environmental protection. Applications in high-humidity or marine environments may benefit from this characteristic. UB3C-680RF8 and 43F680E are moisture-resistant as well, though not explicitly listed as a feature for 43F680E.