1812HC122MAT1A Equivalent & Substitute Parts

Part Overview

The 1812HC122MAT1A is a 1200 pF ceramic capacitor rated for 3000V (3kV) with X7R temperature coefficient, manufactured by KYOCERA AVX. This high-voltage surface-mount multilayer ceramic capacitor (MLCC) is designed for general-purpose applications requiring stable capacitance across a wide 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). Equivalent and substitute parts are identified when they maintain the same capacitance value, voltage rating, temperature coefficient, and package footprint while offering alternative tolerance specifications or enhanced electrical characteristics.

Substiute Parts

1812HC122MAT1A

KYOCERA AVXIn Stock: 11351812HC122MAT1A Datasheet

Current PartRFQ

1812HC122KAT1A

KYOCERA AVXIn Stock: 7401812HC122KAT1A Datasheet

UpgradeRFQ

C1812C122JHRAC7800

KEMETIn Stock: 1718C1812C122JHRAC7800 Datasheet

UpgradeRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution for the 1812HC122MAT1A is determined by strict equivalence in the following parameters:

• Capacitance value: 1200 pF (exact match required)
• Voltage rating: 3000V (3kV) minimum (equal or higher acceptable)
• Temperature coefficient: X7R (required for temperature stability)
• Package footprint: 1812 (4532 Metric) (physical compatibility)
• Mounting type: Surface Mount, MLCC (assembly compatibility)

Substitute parts may differ in tolerance specification (±20%, ±10%, ±5%) and physical dimensions within the same package class, provided all critical electrical parameters remain equivalent. All identified substitutes maintain ROHS3 compliance and MSL 1 rating.

Parameter Comparison

Engineering Selection Recommendations

All three parts—1812HC122MAT1A, 1812HC122KAT1A, and C1812C122JHRAC7800—are active production components with full ROHS3 compliance and unlimited moisture sensitivity rating. Selection between these parts depends on tolerance requirements and physical space constraints:

1812HC122MAT1A (±20% tolerance) is suitable for general-purpose applications where capacitance variation within ±20% is acceptable.

1812HC122KAT1A (±10% tolerance) provides tighter capacitance control while maintaining identical electrical and thermal characteristics, offering improved performance for applications requiring more precise capacitance values.

C1812C122JHRAC7800 (±5% tolerance) delivers the highest capacitance accuracy and includes low ESL characteristics. This part has slightly reduced physical dimensions (0.071" thickness versus 0.087"), which may provide advantages in space-constrained designs while maintaining full electrical equivalence.

Frequently Asked Questions (FAQ)

Q: Can 1812HC122KAT1A replace 1812HC122MAT1A directly?

A: Yes. Both parts share identical capacitance (1200 pF), voltage rating (3kV), temperature coefficient (X7R), and package footprint (1812). The primary difference is tolerance specification (±10% versus ±20%), which represents an improvement in capacitance accuracy. No circuit modifications are required.

Q: What is the difference between these parts and the KEMET C1812C122JHRAC7800?

A: The KEMET part maintains the same electrical specifications (1200 pF, 3kV, X7R) and package class (1812) but offers ±5% tolerance and lower profile (0.071" thickness versus 0.087"). Physical dimensions differ slightly (4.50mm length versus 4.60mm), which may affect PCB layout in space-constrained applications.

Q: Are all three parts physically interchangeable on the PCB?

A: The KYOCERA AVX parts (1812HC122MAT1A and 1812HC122KAT1A) are fully interchangeable with identical footprints. The KEMET C1812C122JHRAC7800 fits the same 1812 package class but has slightly different length and thickness dimensions. Verify PCB pad spacing and height clearance before substitution.

Q: Do tolerance differences affect circuit performance?

A: Tolerance differences (±20%, ±10%, ±5%) define the acceptable range of actual capacitance values around the nominal 1200 pF specification. Selection depends on circuit requirements. Applications with strict capacitance specifications benefit from lower tolerance parts (±5% or ±10%), while general-purpose circuits typically accept ±20% tolerance.

Q: Are all parts compliant with environmental and regulatory standards?

A: Yes. All three parts are ROHS3 compliant, REACH unaffected, and classified as EAR99 for export control purposes. All carry MSL 1 (unlimited) moisture sensitivity rating, indicating no special moisture handling requirements during storage or assembly.