UP025B391K-A-BZ Equivalent & Substitute Parts

Part Overview

The UP025B391K-A-BZ is a 390 pF ceramic capacitor rated at 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. The part maintains ROHS3 compliance and MSL Level 1 rating, suitable for general-purpose applications across industrial and consumer electronics.

Substiute Parts

UP025B391K-A-BZ

Taiyo YudenIn Stock: 1143UP025B391K-A-BZ Datasheet

Current PartRFQ

A391K15X7RF5UAA

Vishay Beyschlag/Draloric/BC ComponentsIn Stock: 816A391K15X7RF5UAA Datasheet

SimilarRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution of the UP025B391K-A-BZ is determined by strict equivalence across the following critical parameters:

Mandatory Matching Parameters:

• Capacitance value: 390 pF
• Tolerance: ±10%
• Voltage rating: 50V (minimum)
• Mounting type: Through Hole
• Package configuration: Axial
• Lead style: Straight

Acceptable Variation Parameters:

• Temperature coefficient: B-type or superior stability (X7R acceptable)
• Operating temperature range: May exceed original specification
• Physical dimensions: Axial packages with compatible lead spacing
• Compliance certifications: ROHS3 and equivalent standards

The substitute part A391K15X7RF5UAA meets all mandatory parameters while providing enhanced temperature stability through X7R coefficient and extended operating range (-55°C to 125°C versus -25°C to 85°C).

Parameter Comparison

Engineering Selection Recommendations

The A391K15X7RF5UAA serves as a direct functional substitute for the obsolete UP025B391K-A-BZ based on the following engineering criteria:

Electrical Equivalence: Both components provide identical capacitance (390 pF), tolerance (±10%), and voltage rating (50V). The substitute's X7R temperature coefficient provides superior capacitance stability across temperature extremes compared to the original B-type coefficient, with no degradation of performance in the original operating range.

Compliance Status: Both parts maintain ROHS3 compliance and EAR99 export classification. The substitute eliminates moisture sensitivity concerns through its Not Applicable MSL designation, reducing handling and storage requirements.

Physical Compatibility: While the substitute exhibits larger physical dimensions (0.098" Dia x 0.150" L versus 0.079" Dia x 0.091" L), both maintain axial through-hole configuration with straight leads, permitting direct PCB footprint accommodation with standard lead spacing tolerances.

Availability: The substitute part is classified as Active with confirmed inventory (755 units), ensuring procurement continuity for the obsolete original component.

Frequently Asked Questions (FAQ)

Q: Can A391K15X7RF5UAA replace UP025B391K-A-BZ in existing designs without modification?

A: Yes. Both components share identical electrical specifications (390 pF, ±10%, 50V) and axial through-hole mounting configuration. The larger physical dimensions of the substitute require verification of available PCB space, but lead spacing and straight-lead configuration remain compatible with standard through-hole assembly processes.

Q: What is the significance of the temperature coefficient difference (B versus X7R)?

A: B-type coefficients exhibit capacitance variation across temperature, while X7R coefficients maintain tighter capacitance tolerance across the full operating range. The substitute's X7R specification provides enhanced stability, particularly beneficial in temperature-sensitive applications. Both coefficients are acceptable for general-purpose applications within their respective operating ranges.

Q: Are there any compliance or certification differences between these parts?

A: Both components are ROHS3 compliant and carry EAR99 export classification. The substitute eliminates moisture sensitivity level concerns (MSL 1 versus Not Applicable), reducing environmental handling requirements during storage and assembly.

Q: What is the impact of the physical size difference on PCB design?

A: The substitute is larger in both diameter (0.098" versus 0.079") and length (0.150" versus 0.091"). PCB layouts must accommodate these dimensions within available component spacing. Lead spacing and straight-lead configuration remain compatible with standard through-hole assembly equipment.

Q: Is the substitute suitable for high-temperature applications?

A: The substitute operates across -55°C to 125°C, exceeding the original specification of -25°C to 85°C. Applications requiring extended temperature performance benefit from this enhanced range. For applications within the original temperature band, both components perform equivalently.

Q: What inventory considerations apply to this substitution?

A: The original UP025B391K-A-BZ is obsolete with 1,068 units in stock. The substitute A391K15X7RF5UAA is active with 755 units available, providing long-term procurement security for ongoing production requirements.