UB3C-1K5F8 Equivalent & Substitute Parts

Part Overview

The UB3C-1K5F8 is a 1.5 kOhm ±1% 3W axial wirewound resistor manufactured by Riedon. This component is designed for through-hole applications requiring precision current sensing with enhanced reliability features including flame proof, moisture resistant, pulse withstanding, and safety certifications. The part maintains Active product status with 969 units in current inventory. Substitute parts are identified when equivalent electrical specifications and mechanical compatibility are maintained across the allowed parameter range.

Substiute Parts

UB3C-1K5F8

RiedonIn Stock: 1021UB3C-1K5F8 Datasheet

Current PartRFQ

43F1K5E

OhmiteIn Stock: 74543F1K5E Datasheet

MFR RecommendedRFQ

RS02B1K500FE70

Vishay DaleIn Stock: 4054RS02B1K500FE70 Datasheet

MFR RecommendedRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution eligibility for the UB3C-1K5F8 is determined by strict equivalence across the following critical parameters:

• Resistance value: 1.5 kOhms
• Tolerance: ±1%
• Power rating: 3W
• Composition: Wirewound
• Package: Axial through-hole
• Temperature coefficient: ±20ppm/°C
• Number of terminations: 2

Both identified substitute parts (43F1K5E and RS02B1K500FE70) meet these core electrical and mechanical requirements. Variations in physical dimensions, operating temperature range extensions, and packaging format (Bulk vs. Cut Tape vs. Tape & Reel) do not affect functional substitutability for applications where the UB3C-1K5F8 is specified.

Parameter Comparison

Engineering Selection Recommendations

All three parts maintain Active product status and meet core electrical specifications. Selection between UB3C-1K5F8, 43F1K5E, and RS02B1K500FE70 should be based on:

Compliance Requirements: The UB3C-1K5F8 and RS02B1K500FE70 both carry ROHS3 Compliant status with REACH Unaffected designation, providing full regulatory alignment for restricted substance applications. The 43F1K5E carries RoHS Compliant status with Vendor Undefined REACH status, requiring verification for applications with strict REACH compliance mandates.

Operating Temperature Range: The RS02B1K500FE70 extends the lower temperature limit to -65°C, providing enhanced performance in cryogenic or extreme cold environments compared to the -55°C minimum of the UB3C-1K5F8. The 43F1K5E extends the upper limit to 275°C, suitable for high-temperature applications beyond the 250°C maximum of the primary part.

Packaging Format: The UB3C-1K5F8 is supplied in Tape & Reel format, the RS02B1K500FE70 in Cut Tape, and the 43F1K5E in Bulk. Packaging selection depends on assembly process requirements and inventory management practices.

Frequently Asked Questions (FAQ)

Q: Can the 43F1K5E replace the UB3C-1K5F8 in all applications?

A: Yes, the 43F1K5E meets all core electrical and mechanical substitution criteria: 1.5 kOhms ±1%, 3W wirewound, axial package, ±20ppm/°C temperature coefficient, and 2 terminations. Physical dimensions differ (0.220" Dia x 0.594" L vs. 0.157" Dia x 0.350" L), requiring PCB layout verification. REACH compliance status should be confirmed for regulated applications.

Q: What is the difference between the RS02B1K500FE70 and UB3C-1K5F8?

A: Both parts are electrically equivalent with identical resistance, tolerance, power rating, and temperature coefficient. The RS02B1K500FE70 offers extended lower temperature operation (-65°C vs. -55°C) and moisture resistant features. Physical dimensions are 0.187" Dia x 0.560" L. Packaging is Cut Tape rather than Tape & Reel.

Q: Are there dimensional constraints for substitution?

A: Axial package compatibility is maintained across all three parts. However, physical dimensions vary: UB3C-1K5F8 (4.00mm x 8.90mm), 43F1K5E (5.60mm x 15.10mm), and RS02B1K500FE70 (4.75mm x 14.22mm). PCB layout, clearance requirements, and thermal management considerations must be evaluated before substitution.

Q: Which substitute part has the best regulatory compliance?

A: Both the UB3C-1K5F8 and RS02B1K500FE70 carry ROHS3 Compliant and REACH Unaffected designations. The 43F1K5E carries RoHS Compliant status with Vendor Undefined REACH status. For applications requiring full ROHS3 and REACH compliance, the UB3C-1K5F8 or RS02B1K500FE70 are preferred.

Q: Can these parts be used interchangeably in current sensing applications?

A: Yes. All three parts are wirewound composition with ±1% tolerance and ±20ppm/°C temperature coefficient, meeting precision current sensing requirements. The UB3C-1K5F8 includes additional flame proof and pulse withstanding features; these are not specified for the substitute parts and should be evaluated for specific safety-critical applications.