UB3C-39RF1 Equivalent & Substitute Parts

Part Overview

The UB3C-39RF1 is a 39 Ohm ±1% 3W axial wirewound resistor manufactured by Riedon. This through-hole component is designed for current sensing applications with enhanced reliability features including flame proof, moisture resistant, and pulse withstanding characteristics. The part is active in production with 697 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-39RF1

RiedonIn Stock: 720UB3C-39RF1 Datasheet

Current PartRFQ

43F39RE

OhmiteIn Stock: 77443F39RE Datasheet

MFR RecommendedRFQ

RS02B39R00FE70

Vishay DaleIn Stock: 2322RS02B39R00FE70 Datasheet

MFR RecommendedRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitute parts for the UB3C-39RF1 are qualified based on the following criteria:

Electrical Parameters (Must Match):

• Resistance value: 39 Ohms
• Tolerance: ±1%
• Power rating: 3W
• Temperature coefficient: ±20ppm/°C

Mechanical Parameters (Must Match):

• Package type: Axial
• Number of terminations: 2
• Composition: Wirewound

Compliance Parameters (Must Be Compatible):

• RoHS compliance status
• REACH compliance status
• Operating temperature range compatibility

The identified substitutes meet all core electrical and mechanical requirements. Operating temperature ranges may extend beyond the original specification, which does not restrict substitution in applications operating within the original range.

Parameter Comparison

Engineering Selection Recommendations

All three components meet the core electrical specifications for 39 Ohm ±1% 3W wirewound axial resistors. Selection between the UB3C-39RF1, 43F39RE, and RS02B39R00FE70 should be based on:

Compliance Considerations:

• UB3C-39RF1 and RS02B39R00FE70 both carry REACH Unaffected status, providing clear regulatory compliance documentation.
• 43F39RE lists REACH status as Vendor Undefined, requiring clarification from the manufacturer for applications with strict REACH compliance requirements.
• All three parts are RoHS compliant.

Physical Dimensions:

• UB3C-39RF1 has the smallest footprint (4.00mm diameter, 8.90mm length), suitable for space-constrained layouts.
• RS02B39R00FE70 offers a mid-range size (4.75mm diameter, 14.22mm length).
• 43F39RE has the largest dimensions (5.60mm diameter, 15.10mm length), which may impact board layout in compact designs.

Availability and Packaging:

• RS02B39R00FE70 offers the highest inventory (2296 units) in Cut Tape packaging.
• UB3C-39RF1 provides 697 units in Bulk packaging.
• 43F39RE provides 762 units in Bulk packaging.

Temperature Range:

• 43F39RE extends to 275°C maximum operating temperature, exceeding the original specification.
• RS02B39R00FE70 extends to -65°C minimum, providing wider low-temperature capability.
• All three operate within the original -55°C to 250°C range.

Frequently Asked Questions (FAQ)

Q: Can 43F39RE, RS02B39R00FE70, and UB3C-39RF1 be used interchangeably?

A: Yes, within the constraints of physical dimensions and board layout. All three components share identical electrical specifications (39 Ohms ±1%, 3W, ±20ppm/°C). Physical size differences must be evaluated for PCB routing and thermal management requirements.

Q: What is the primary difference between these substitute parts?

A: The main differences are physical dimensions and REACH compliance documentation. UB3C-39RF1 is the most compact. RS02B39R00FE70 offers the highest inventory availability. 43F39RE provides the widest operating temperature range but has undefined REACH status.

Q: Are there any restrictions on substituting RS02B39R00FE70 for UB3C-39RF1?

A: No electrical restrictions exist. The RS02B39R00FE70 is larger (4.75mm diameter vs. 4.00mm) and has Not Applicable MSL status instead of MSL 1. Verify PCB layout compatibility before substitution.

Q: Which substitute part is recommended for high-reliability applications?

A: Selection depends on specific requirements. UB3C-39RF1 and RS02B39R00FE70 both carry REACH Unaffected status. UB3C-39RF1 includes current sense, flame proof, and pulse withstanding features. Evaluate application-specific reliability requirements against these documented features.

Q: Does operating temperature range affect substitution eligibility?

A: No. All three parts operate within the original -55°C to 250°C specification. Extended ranges on 43F39RE and RS02B39R00FE70 do not restrict their use in applications within the original range.

Q: What packaging formats are available?

A: UB3C-39RF1 and 43F39RE are supplied in Bulk packaging. RS02B39R00FE70 is supplied in Cut Tape (CT) format, which may affect handling and assembly processes.