UB3C-680RF1 Equivalent & Substitute Parts

Part Overview

The UB3C-680RF1 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 1355 units in stock. Substitute parts are necessary to address supply chain flexibility, alternative packaging formats, or extended operating temperature requirements while maintaining electrical and mechanical compatibility.

Substiute Parts

UB3C-680RF1

RiedonIn Stock: 1384UB3C-680RF1 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

Substitution eligibility for the UB3C-680RF1 is determined by strict equivalence across the following parameters:

• Resistance value: 680 Ohms (exact match required)
• Tolerance: ±1% (exact match required)
• Power rating: 3W (exact match required)
• Composition: Wirewound (exact match required)
• Package type: Axial (exact match required)
• Temperature coefficient: ±20ppm/°C (exact match required)
• Termination count: 2 (exact match required)

The identified substitute parts meet all core electrical and mechanical requirements. Variations in physical dimensions, operating temperature range, and packaging format (bulk vs. cut tape) do not affect functional substitution within the specified application parameters.

Parameter Comparison

Engineering Selection Recommendations

All three parts are active products with established supply availability. Selection between UB3C-680RF1, 43F680E, and WW3FT680R should be based on the following factors:

UB3C-680RF1 (Riedon): Primary choice when current sensing and flame-proof characteristics are specified. ROHS3 compliant with REACH unaffected status. Compact axial form factor (4.00mm diameter). Operating temperature limited to 250°C maximum.

43F680E (Ohmite): Suitable when extended operating temperature to 275°C is required. RoHS compliant with vendor-undefined REACH status. Larger physical envelope (5.60mm diameter) may require PCB layout verification.

WW3FT680R (Stackpole): Optimal for applications requiring maximum operating temperature to 350°C. ROHS3 compliant with REACH unaffected status. Moisture-resistant feature explicitly stated. Available in cut tape packaging. Intermediate physical dimensions (4.75mm diameter).

All parts maintain identical electrical performance within the specified tolerance and temperature coefficient parameters.

Frequently Asked Questions (FAQ)

Q: Can WW3FT680R replace UB3C-680RF1 in a current sensing circuit? A: Yes. Both parts share identical resistance, tolerance, power rating, and temperature coefficient specifications. The WW3FT680R provides extended operating temperature capability to 350°C, making it suitable for higher-temperature environments.

Q: What is the primary difference between these substitute parts? A: The core electrical parameters are identical. Differences exist in physical dimensions, maximum operating temperature, and packaging format. The UB3C-680RF1 is the most compact. The WW3FT680R offers the highest temperature rating. The 43F680E provides intermediate temperature capability.

Q: Are there PCB layout considerations when substituting these parts? A: Yes. Physical dimensions vary: UB3C-680RF1 measures 4.00mm diameter, 43F680E measures 5.60mm diameter, and WW3FT680R measures 4.75mm diameter. Verify PCB hole spacing and component clearance before substitution.

Q: Do all parts meet RoHS compliance requirements? A: UB3C-680RF1 and WW3FT680R are ROHS3 compliant. The 43F680E is RoHS compliant. Verify your specific RoHS requirement level before selection.

Q: What is the difference between bulk and cut tape packaging? A: UB3C-680RF1 and 43F680E are supplied in bulk packaging. WW3FT680R is supplied in cut tape format. Packaging does not affect electrical performance; selection depends on assembly process requirements.

Q: Can these parts be used interchangeably in flame-proof applications? A: The UB3C-680RF1 explicitly includes flame-proof characteristics. The 43F680E and WW3FT680R specifications do not list this feature. Verify application requirements before substitution in flame-proof-critical circuits.