UP050B123K-NACZ Equivalent & Substitute Parts

Part Overview

The UP050B123K-NACZ is a 0.012 µF ceramic capacitor rated for 50V with B temperature coefficient, manufactured by Taiyo Yuden in axial through-hole configuration. This component is classified as obsolete, necessitating identification of functionally equivalent alternatives for ongoing design support and procurement continuity. Substitute parts must maintain electrical performance across the specified operating range while meeting current manufacturing and compliance standards.

Substiute Parts

UP050B123K-NACZ

Taiyo YudenIn Stock: 1137UP050B123K-NACZ Datasheet

Current PartRFQ

A123K15X7RF5UAA

Vishay Beyschlag/Draloric/BC ComponentsIn Stock: 860A123K15X7RF5UAA Datasheet

DirectRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution of the UP050B123K-NACZ is determined by strict equivalence across electrical and mechanical parameters. The following criteria establish valid substitution:

Electrical Parameters (Mandatory Match):

• Capacitance value: 0.012 µF
• Voltage rating: 50V minimum
• Tolerance: ±10%

Mechanical Parameters (Mandatory Match):

• Mounting configuration: Through-hole axial
• Lead style: Straight
• Package type: Axial ceramic capacitor

Performance Parameters (Acceptable Variation):

• Temperature coefficient: Substitute may exceed original specification (B coefficient upgraded to X7R provides superior temperature stability)
• Operating temperature range: Substitute may provide extended range beyond original -25°C ~ 85°C specification
• Moisture sensitivity: Substitute with lower or equivalent MSL rating acceptable

The identified substitute A123K15X7RF5UAA meets all mandatory electrical and mechanical criteria while providing enhanced performance characteristics through superior temperature coefficient classification and extended operating range.

Parameter Comparison

Engineering Selection Recommendations

Primary Substitute: A123K15X7RF5UAA

The A123K15X7RF5UAA is the qualified substitute for UP050B123K-NACZ based on the following engineering criteria:

Electrical Equivalence: All critical electrical parameters match exactly: 0.012 µF capacitance, 50V voltage rating, and ±10% tolerance. The substitute maintains functional equivalence in circuit applications requiring these specifications.

Mechanical Compatibility: Both components utilize identical through-hole axial mounting configuration with straight leads, ensuring direct PCB layout compatibility. Physical dimensions of the substitute (0.098" Dia x 0.150" L) are slightly larger than the original (0.087" Dia x 0.126" L) but remain within standard axial capacitor envelope tolerances for through-hole applications.

Performance Enhancement: The substitute features X7R temperature coefficient, providing superior temperature stability compared to the original B coefficient specification. Operating temperature range extends from -55°C ~ 125°C versus the original -25°C ~ 85°C, enabling deployment in wider environmental conditions.

Compliance and Availability: The substitute is classified as active product status with current manufacturing availability (849 pcs in stock). RoHS3 compliance and REACH unaffected status confirm regulatory alignment with current electronic component standards. Export classification (EAR99) matches the original component.

Substitution Validity: Direct substitution is valid for all applications where the original UP050B123K-NACZ was specified. No circuit redesign or performance degradation results from this substitution. The enhanced temperature coefficient and extended operating range provide additional design margin.

Frequently Asked Questions (FAQ)

Q: Can A123K15X7RF5UAA be used as a direct replacement for UP050B123K-NACZ?

A: Yes. Both components share identical capacitance (0.012 µF), voltage rating (50V), tolerance (±10%), and mounting configuration (through-hole axial). The substitute is electrically and mechanically compatible for direct PCB substitution.

Q: What is the difference between B and X7R temperature coefficients?

A: Temperature coefficient designates capacitance change across operating temperature range. B coefficient (original) specifies ±15% capacitance change over -25°C ~ 85°C. X7R coefficient (substitute) specifies ±15% capacitance change over -55°C ~ 125°C, providing superior stability across a wider temperature window. For applications within the original -25°C ~ 85°C range, both coefficients perform equivalently.

Q: Are the physical dimensions compatible with existing PCB layouts?

A: The substitute dimensions (0.098" Dia x 0.150" L) are slightly larger than the original (0.087" Dia x 0.126" L). Standard through-hole axial capacitor PCB footprints accommodate this size variation. Verify PCB hole spacing and component clearance in confined layouts before substitution.

Q: Why is the original part obsolete?

A: The UP050B123K-NACZ is classified as obsolete by Taiyo Yuden, indicating discontinued manufacturing. The A123K15X7RF5UAA provides current-generation equivalent functionality with active manufacturing status and improved performance characteristics.

Q: Does the substitute meet current compliance requirements?

A: Yes. The A123K15X7RF5UAA is RoHS3 compliant and REACH unaffected, meeting current electronic component regulatory standards. The original component compliance status was not specified in available documentation.

Q: What is the inventory status for the substitute?

A: The A123K15X7RF5UAA is currently available with 849 pcs in stock as new original components in tape and box packaging.

Q: Are there any circuit performance differences between the original and substitute?

A: No circuit performance differences exist within the original operating specification range (-25°C ~ 85°C). The substitute provides identical capacitance, voltage rating, and tolerance. Enhanced temperature coefficient and extended operating range represent performance improvements applicable only outside the original specification envelope.