08055U121FAT4A Equivalent & Substitute Parts

Part Overview

The 08055U121FAT4A is a 120 pF ceramic capacitor manufactured by KYOCERA AVX, rated at 50V with C0G/NP0 temperature coefficient in 0805 (2012 Metric) surface mount package. This component is designed for RF, microwave, and high-frequency applications requiring ultra-low ESR performance. The part is currently active in production with ROHS3 compliance and unlimited moisture sensitivity rating (MSL 1). Substitute parts are identified when equivalent electrical and mechanical specifications are required due to inventory constraints, application voltage upgrades, or design optimization needs.

Substiute Parts

08055U121FAT4A

KYOCERA AVXIn Stock: 78708055U121FAT4A Datasheet

Current PartRFQ

08051U121FAT2A

KYOCERA AVXIn Stock: 504808051U121FAT2A Datasheet

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Key Parameters

Substitute Part Grouping Explanation

The 08051U121FAT2A qualifies as a direct substitute based on the following allowed electrical and mechanical parameters:

• Identical capacitance value: 120 pF
• Identical tolerance: ±1%
• Identical temperature coefficient: C0G, NP0
• Identical operating temperature range: -55°C ~ 125°C
• Identical package: 0805 (2012 Metric)
• Identical mounting type: Surface Mount, MLCC
• Identical physical dimensions: 0.079" L x 0.049" W (2.01mm x 1.25mm)
• Identical thickness: 0.045" (1.15mm)
• Identical features: Ultra Low ESR
• Identical compliance: ROHS3, MSL 1

The primary difference is the rated voltage: 08051U121FAT2A is rated at 100V versus 50V for the main part. This represents an upgrade path where higher voltage rating provides additional design margin without altering electrical performance in the specified operating range.

Parameter Comparison

Engineering Selection Recommendations

Both parts are active products from KYOCERA AVX with identical ROHS3 compliance and REACH unaffected status. The 08051U121FAT2A provides equivalent functionality with enhanced voltage rating (100V vs 50V), making it suitable for applications where increased design margin is beneficial. Selection between these parts depends on circuit voltage requirements and inventory availability. Both parts maintain identical electrical performance characteristics within their respective rated voltage specifications.

Frequently Asked Questions (FAQ)

Q: Can 08051U121FAT2A replace 08055U121FAT4A in all applications?

A: Yes, provided the circuit voltage does not exceed 50V. The 08051U121FAT2A's 100V rating is compatible with any application designed for the 50V part. The identical capacitance, tolerance, temperature coefficient, and package ensure direct functional equivalence.

Q: Are there physical differences between these parts?

A: No. Both parts share identical dimensions (0.079" L x 0.049" W, 2.01mm x 1.25mm) and thickness (0.045", 1.15mm). They are mechanically interchangeable in 0805 (2012 Metric) footprints.

Q: Do these parts have different moisture sensitivity requirements?

A: No. Both parts carry MSL 1 (Unlimited) rating, indicating identical moisture sensitivity handling and storage requirements.

Q: What is the significance of the voltage rating difference?

A: The 100V rating of 08051U121FAT2A provides additional voltage margin compared to the 50V rating of 08055U121FAT4A. In circuits operating below 50V, both parts perform identically. The higher rating does not affect capacitance, tolerance, or frequency response.

Q: Are both parts ROHS3 compliant?

A: Yes. Both 08055U121FAT4A and 08051U121FAT2A are ROHS3 compliant with REACH unaffected status, meeting identical environmental and regulatory requirements.