UB3C-120RF8 Equivalent & Substitute Parts

Part Overview

The UB3C-120RF8 is a 120 Ohm ±1% 3W axial wirewound resistor manufactured by Riedon in the UB series. This component is designed for through-hole applications requiring current sensing with enhanced reliability features including flame proof, moisture resistant, pulse withstanding, and safety certifications. The part is currently active in production with 696 units in stock. Equivalent and substitute parts are identified when identical electrical specifications and mechanical compatibility are maintained across alternative manufacturers.

Substiute Parts

UB3C-120RF8

RiedonIn Stock: 762UB3C-120RF8 Datasheet

Current PartRFQ

43F120

OhmiteIn Stock: 95143F120 Datasheet

MFR RecommendedRFQ

43F120E

OhmiteIn Stock: 111843F120E Datasheet

MFR RecommendedRFQ

RS02B120R0FE70

Vishay DaleIn Stock: 3170RS02B120R0FE70 Datasheet

MFR RecommendedRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitute parts for the UB3C-120RF8 are qualified based on the following criteria:

Electrical Parameters (Must Match):

• Resistance value: 120 Ohms
• Tolerance: ±1%
• Power rating: 3W
• Composition: Wirewound
• Temperature coefficient: ±20ppm/°C

Mechanical Parameters (Must Match):

• Package type: Axial
• Number of terminations: 2

Compliance Parameters (Acceptable Variations):

• RoHS status: ROHS3 Compliant or equivalent
• Operating temperature range: Must support minimum -55°C to 250°C or equivalent industrial range

All identified substitute parts maintain identical electrical and mechanical specifications. Variations in physical dimensions, packaging format (Tape & Reel vs. Bulk vs. Cut Tape), and specific feature sets do not affect functional substitutability in circuit applications.

Parameter Comparison

Engineering Selection Recommendations

All three substitute parts meet the core electrical and mechanical requirements for direct substitution with the UB3C-120RF8. Selection should be based on the following factors:

For RoHS3 Compliance Requirements: The 43F120E (Ohmite) and RS02B120R0FE70 (Vishay Dale) are both ROHS3 compliant. The 43F120 (Ohmite) is RoHS non-compliant and should not be selected for applications requiring RoHS certification.

For Extended Temperature Range: The RS02B120R0FE70 (Vishay Dale) supports -65°C to 250°C, providing 10°C additional low-temperature margin compared to the UB3C-120RF8 specification of -55°C to 250°C.

For Packaging and Logistics:

• Tape & Reel format: UB3C-120RF8 (original)
• Bulk format: 43F120E or 43F120 (Ohmite)
• Cut Tape format: RS02B120R0FE70 (Vishay Dale)

For Inventory Availability: RS02B120R0FE70 (Vishay Dale) offers the highest stock level at 3099 units, followed by 43F120E (Ohmite) at 1062 units.

Frequently Asked Questions (FAQ)

Q: Can 43F120 be used as a substitute for UB3C-120RF8? A: The 43F120 matches all electrical and mechanical specifications but is RoHS non-compliant. It is functionally equivalent for applications without RoHS requirements. For RoHS3 compliant designs, use 43F120E instead.

Q: Are the physical dimension differences between substitute parts significant? A: Physical dimensions vary across substitutes (ranging from 4.00mm to 5.60mm diameter). Verify PCB layout and mechanical clearances before substitution. All parts maintain axial package compatibility and identical electrical performance.

Q: Which substitute offers the best compliance profile? A: Both 43F120E (Ohmite) and RS02B120R0FE70 (Vishay Dale) are ROHS3 compliant with REACH Unaffected status. The RS02B120R0FE70 additionally provides extended low-temperature operation to -65°C.

Q: Can substitutes be mixed in the same assembly? A: Yes. All substitute parts are electrically and mechanically equivalent. Mixed sourcing is acceptable provided packaging format requirements and compliance certifications are met for the application.

Q: What is the impact of different packaging formats? A: Packaging format (Tape & Reel, Bulk, Cut Tape) affects procurement and assembly logistics but does not impact electrical performance or circuit functionality. Select based on manufacturing process requirements.