UB5C-68RF1 Equivalent & Substitute Parts

Part Overview

The UB5C-68RF1 is a 68 Ohm ±1% 5W 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, pulse withstanding, and safety certifications. The part is currently active in production with 707 units in stock. Substitute parts are necessary to address supply chain continuity, alternative sourcing preferences, or specific application requirements while maintaining electrical and mechanical compatibility.

Key Parameters

Parameter	Value
Resistance	68 Ohms
Tolerance	±1%
Power Rating	5W
Composition	Wirewound
Package Type	Axial
Temperature Coefficient	±20ppm/°C
Operating Temperature Range	-55°C ~ 250°C
Terminations	2
RoHS Status	ROHS3 Compliant
Moisture Sensitivity Level	1 (Unlimited)

Substitute Part Grouping Explanation

Substitution eligibility for the UB5C-68RF1 is determined by strict equivalence across the following critical parameters:

Resistance value: 68 Ohms
Tolerance: ±1%
Power rating: 5W
Composition: Wirewound
Package: Axial through-hole
Temperature coefficient: ±20ppm/°C
Number of terminations: 2

All substitute parts listed meet these core electrical and mechanical requirements. Variations in physical dimensions, operating temperature range extensions, and feature sets do not affect functional substitutability within the specified parameter constraints.

Parameter Comparison

Parameter	UB5C-68RF1 (Riedon)	45F68RE (Ohmite)	RS00568R00FE73 (Vishay Dale)
Resistance	68 Ohms	68 Ohms	68 Ohms
Tolerance	±1%	±1%	±1%
Power Rating	5W	5W	5W
Composition	Wirewound	Wirewound	Wirewound
Package Type	Axial	Axial	Axial
Temperature Coefficient	±20ppm/°C	±20ppm/°C	±20ppm/°C
Operating Temperature Range	-55°C ~ 250°C	-55°C ~ 275°C	-65°C ~ 250°C
Terminations	2	2	2
RoHS Status	ROHS3 Compliant	RoHS Compliant	ROHS3 Compliant
Moisture Sensitivity Level	1 (Unlimited)	1 (Unlimited)	Not Applicable
REACH Status	REACH Unaffected	Vendor Undefined	REACH Unaffected
Packaging Format	Bulk	Bulk	Cut Tape (CT)
Inventory Availability	707 Pcs	666 Pcs	1350 Pcs

Engineering Selection Recommendations

All three parts meet the core electrical specifications and are classified as active products. Selection between UB5C-68RF1, 45F68RE, and RS00568R00FE73 should be based on the following factors:

Compliance and Regulatory Status: UB5C-68RF1 and RS00568R00FE73 both carry ROHS3 Compliant and REACH Unaffected designations, providing full regulatory alignment. The 45F68RE is RoHS Compliant with Vendor Undefined REACH status, which may require additional verification for applications with strict regulatory requirements.

Operating Temperature Range: The 45F68RE extends the upper operating temperature to 275°C compared to 250°C for both UB5C-68RF1 and RS00568R00FE73. The RS00568R00FE73 extends the lower operating temperature to -65°C. Selection depends on application thermal requirements.

Packaging and Availability: RS00568R00FE73 offers the highest inventory level at 1350 units in Cut Tape format, suitable for automated assembly. UB5C-68RF1 and 45F68RE are available in Bulk packaging with 707 and 666 units respectively.

Feature Set: UB5C-68RF1 includes current sense, flame proof, moisture resistant, pulse withstanding, and safety features. RS00568R00FE73 specifies moisture resistant. The 45F68RE does not list specific features beyond wirewound construction.

Frequently Asked Questions (FAQ)

Q: Can 45F68RE be used as a direct replacement for UB5C-68RF1?

A: Yes. Both parts share identical electrical specifications: 68 Ohms ±1% at 5W with ±20ppm/°C temperature coefficient and axial wirewound construction. Physical dimensions differ (45F68RE: 0.343" Dia x 0.937" L versus UB5C-68RF1: 0.250" Dia x 0.500" L), requiring PCB layout verification. REACH compliance status for 45F68RE is vendor undefined and should be confirmed for regulated applications.

Q: Can RS00568R00FE73 be used as a direct replacement for UB5C-68RF1?

A: Yes. Both parts meet identical electrical requirements: 68 Ohms ±1% at 5W with ±20ppm/°C temperature coefficient and axial wirewound construction. Physical dimensions differ (RS00568R00FE73: 0.312" Dia x 0.875" L versus UB5C-68RF1: 0.250" Dia x 0.500" L), requiring PCB layout verification. RS00568R00FE73 is supplied in Cut Tape format versus Bulk for UB5C-68RF1.

Q: What are the key differences in physical dimensions?

A: UB5C-68RF1 is the smallest at 0.250" diameter and 0.500" length. RS00568R00FE73 measures 0.312" diameter and 0.875" length. 45F68RE is the largest at 0.343" diameter and 0.937" length. All three fit standard axial through-hole footprints but require verification that PCB spacing accommodates the larger substitute dimensions.

Q: Are there differences in moisture resistance?

A: UB5C-68RF1 explicitly specifies moisture resistant features. RS00568R00FE73 also specifies moisture resistant. 45F68RE does not list specific moisture resistance features in the provided data. For applications requiring moisture protection, UB5C-68RF1 or RS00568R00FE73 are preferred.

Q: Which substitute offers the best regulatory compliance?

A: UB5C-68RF1 and RS00568R00FE73 both carry ROHS3 Compliant and REACH Unaffected designations. 45F68RE is RoHS Compliant with Vendor Undefined REACH status. For applications with strict regulatory requirements, UB5C-68RF1 or RS00568R00FE73 are recommended.

Q: What is the difference in operating temperature ranges?

A: UB5C-68RF1 operates from -55°C to 250°C. RS00568R00FE73 extends the lower limit to -65°C. 45F68RE extends the upper limit to 275°C. Selection depends on specific application thermal requirements.

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