18121C184MAT2A Equivalent & Substitute Parts

Part Overview

The 18121C184MAT2A is a 0.18 µF ceramic capacitor manufactured by KYOCERA AVX, rated for 100V with X7R temperature coefficient in 1812 (4532 Metric) surface mount package. This component is designed for general purpose applications requiring stable capacitance across the operating temperature range of -55°C to 125°C. The part is currently active in production with ROHS3 compliance and unlimited moisture sensitivity rating (MSL 1). Substitute parts are identified when equivalent electrical specifications and mechanical compatibility are maintained within the allowed parameter tolerances for this product category.

Substiute Parts

18121C184MAT2A

KYOCERA AVXIn Stock: 95418121C184MAT2A Datasheet

Current PartRFQ

18121C184KAT2A

KYOCERA AVXIn Stock: 89018121C184KAT2A Datasheet

UpgradeRFQ

C1812C184K1RAC7800

KEMETIn Stock: 2273C1812C184K1RAC7800 Datasheet

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Key Parameters

Substitute Part Grouping Explanation

Substitution eligibility for the 18121C184MAT2A is determined by strict equivalence in the following parameters:

• Capacitance Value: Must be 0.18 µF (no deviation permitted)
• Voltage Rating: Must be 100V or higher (equal or superior rating acceptable)
• Temperature Coefficient: Must be X7R (ensures equivalent thermal stability)
• Package: Must be 1812 (4532 Metric) surface mount (ensures PCB compatibility)
• Mounting Type: Must be Surface Mount MLCC (assembly process compatibility)
• Operating Temperature Range: Must span -55°C to 125°C minimum
• Regulatory Compliance: Must maintain ROHS3 compliance and MSL 1 rating

Two substitute parts meet these criteria: 18121C184KAT2A (KYOCERA AVX) and C1812C184K1RAC7800 (KEMET). Both maintain identical capacitance, voltage, temperature coefficient, and package specifications. The primary difference is tolerance specification, where substitutes offer ±10% tolerance compared to the main part's ±20% tolerance, representing an upgrade in precision capability.

Parameter Comparison

Engineering Selection Recommendations

All three parts—18121C184MAT2A, 18121C184KAT2A, and C1812C184K1RAC7800—are active production components with ROHS3 compliance and MSL 1 rating, ensuring regulatory and environmental compatibility across applications.

The 18121C184KAT2A (KYOCERA AVX) provides direct manufacturer continuity with identical physical dimensions and thickness specifications. This part offers improved tolerance (±10% versus ±20%), making it suitable for applications requiring tighter capacitance control while maintaining the same supplier relationship.

The C1812C184K1RAC7800 (KEMET) is functionally equivalent with identical electrical specifications. Minor dimensional variations exist: length is 0.177" (4.50mm) versus 0.180" (4.57mm), and maximum thickness is 0.043" (1.10mm) versus 0.040" (1.02mm). These variations remain within standard 1812 package tolerances and do not affect PCB footprint compatibility. This part is suitable for applications where KEMET supply chain preference or inventory availability is a factor.

Selection between substitutes should be based on supply chain requirements, inventory availability, and manufacturer preference rather than electrical performance, as all three parts are electrically and mechanically interchangeable for the specified application.

Frequently Asked Questions (FAQ)

Q: Can 18121C184KAT2A replace 18121C184MAT2A directly?

A: Yes. Both parts are identical in capacitance (0.18 µF), voltage rating (100V), temperature coefficient (X7R), package (1812), and physical dimensions. The 18121C184KAT2A offers superior tolerance (±10% versus ±20%), making it a direct upgrade-capable substitute.

Q: What is the difference between ±20% and ±10% tolerance?

A: Tolerance specifies the allowable deviation from the nominal 0.18 µF value. The ±20% part allows deviation from 0.144 µF to 0.216 µF, while the ±10% part allows deviation from 0.162 µF to 0.198 µF. Applications requiring tighter capacitance control benefit from the ±10% specification.

Q: Can C1812C184K1RAC7800 (KEMET) be used instead of the KYOCERA AVX part?

A: Yes. The KEMET part maintains identical electrical specifications and 1812 package compatibility. Minor dimensional differences (0.177" length versus 0.180", and 0.043" thickness versus 0.040") are within standard package tolerances and do not affect PCB footprint or assembly compatibility.

Q: Are all three parts ROHS3 compliant?

A: Yes. All three parts—18121C184MAT2A, 18121C184KAT2A, and C1812C184K1RAC7800—carry ROHS3 compliance certification and MSL 1 (unlimited) moisture sensitivity rating.

Q: What determines if a ceramic capacitor can substitute for another?

A: For 0.18 µF 100V X7R 1812 capacitors, substitution requires equivalence in: capacitance value, voltage rating, temperature coefficient, package type, mounting method, operating temperature range, and regulatory compliance. Tolerance and minor dimensional variations do not prevent substitution if the core specifications match.

Q: Can I use a higher voltage-rated capacitor as a substitute?

A: Yes. A capacitor rated for higher voltage (e.g., 200V instead of 100V) is electrically compatible and can be used in place of a 100V-rated part. However, this may introduce unnecessary cost and size considerations depending on the application.