KYOCERA AVX 18121C394MAT2A Equivalent & Substitute Parts

Part Overview

The KYOCERA AVX 18121C394MAT2A is a 0.39 µF ceramic capacitor rated for 100V with X7R temperature coefficient, packaged in 1812 (4532 Metric) surface mount form factor. This multilayer ceramic capacitor (MLCC) is designed for general-purpose applications requiring stable capacitance across the operating temperature range of -55°C to 125°C. The part is ROHS3 compliant and carries MSL 1 rating, indicating unlimited moisture sensitivity protection. Substitute parts are identified when equivalent electrical specifications and mechanical compatibility are maintained within the allowed parameter tolerances for this product category.

Substiute Parts

18121C394MAT2A

KYOCERA AVXIn Stock: 108218121C394MAT2A Datasheet

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18121C394KAT2A

KYOCERA AVXIn Stock: 182318121C394KAT2A Datasheet

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Key Parameters

Substitute Part Grouping Explanation

Substitution eligibility for the 18121C394MAT2A is determined by the following critical parameters:

• Capacitance Value: Must be 0.39 µF (no deviation permitted)
• Voltage Rating: Must be 100V or higher
• Temperature Coefficient: Must be X7R (ensures stable performance across -55°C to 125°C)
• Package / Case: Must be 1812 (4532 Metric) for mechanical compatibility
• Mounting Type: Must be Surface Mount, MLCC
• Physical Dimensions: Must match 0.180" L x 0.126" W (4.57mm x 3.20mm)
• Thickness: Must not exceed 0.040" (1.02mm)
• Compliance: Must maintain ROHS3 and MSL 1 ratings

The tolerance specification may vary between substitute parts while maintaining functional equivalence. The 18121C394KAT2A qualifies as a direct substitute based on identical electrical and mechanical parameters, with the distinction of tighter capacitance tolerance (±10% versus ±20%).

Parameter Comparison

Engineering Selection Recommendations

Both the 18121C394MAT2A and 18121C394KAT2A are active products from KYOCERA AVX with full ROHS3 compliance and MSL 1 rating. The primary distinction is capacitance tolerance: the substitute part 18121C394KAT2A offers ±10% tolerance compared to the ±20% tolerance of the main part. This tighter tolerance specification makes the substitute suitable for applications requiring higher capacitance accuracy. Both parts are electrically and mechanically interchangeable within the specified parameter ranges. Selection between these parts should be based on tolerance requirements and packaging format availability (bulk versus Tape & Reel).

Frequently Asked Questions (FAQ)

Q: Can the 18121C394KAT2A replace the 18121C394MAT2A in existing designs?

A: Yes. Both parts share identical capacitance value (0.39 µF), voltage rating (100V), temperature coefficient (X7R), package dimensions (1812/4532 Metric), and compliance certifications. The substitute features tighter tolerance (±10% versus ±20%), making it functionally compatible for direct substitution.

Q: What is the significance of the tolerance difference between these parts?

A: The 18121C394MAT2A allows ±20% capacitance variation, while the 18121C394KAT2A allows ±10% variation. Applications requiring tighter capacitance accuracy should specify the substitute part. Both tolerances fall within acceptable ranges for general-purpose ceramic capacitor applications.

Q: Are there packaging differences between these parts?

A: Yes. The main part (18121C394MAT2A) is supplied in bulk packaging, while the substitute (18121C394KAT2A) is supplied in Tape & Reel (TR) format. Both are suitable for automated assembly processes; Tape & Reel packaging is standard for high-volume production environments.

Q: Do both parts meet the same compliance standards?

A: Yes. Both the 18121C394MAT2A and 18121C394KAT2A are ROHS3 compliant, REACH unaffected, and carry MSL 1 (Unlimited) moisture sensitivity rating. Both are classified under ECCN EAR99 and HTSUS 8532.24.0020.

Q: What is the operating temperature range for these capacitors?

A: Both parts operate across -55°C to 125°C. The X7R temperature coefficient ensures stable capacitance performance throughout this range, with capacitance variation limited by the specified tolerance bands.