1812J3K00331MXT Equivalent & Substitute Parts

Part Overview

The 1812J3K00331MXT is a 330 pF ceramic capacitor rated for 3000V (3kV) with X7R temperature coefficient, manufactured by Knowles Syfer. This surface mount multilayer ceramic capacitor (MLCC) is designed for general purpose applications requiring high voltage performance in a compact 1812 (4532 Metric) package form factor. The part is currently active in production with full inventory availability. Substitute parts are identified to provide alternative sourcing options while maintaining electrical and mechanical compatibility for circuit applications.

Substiute Parts

1812J3K00331MXT

Knowles SyferIn Stock: 11151812J3K00331MXT Datasheet

Current PartRFQ

C1812C331JHGAC7800

KEMETIn Stock: 1332C1812C331JHGAC7800 Datasheet

MFR RecommendedRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution eligibility for the 1812J3K00331MXT is determined by strict equivalence across the following critical parameters:

Capacitance value must be 330 pF. Voltage rating must be 3000V (3kV) or higher. Package form factor must be 1812 (4532 Metric) to ensure mechanical and electrical compatibility with existing PCB layouts. Operating temperature range must encompass -55°C to 125°C. Mounting type must be surface mount MLCC. Moisture sensitivity level must be MSL 1 or lower. RoHS3 compliance and REACH unaffected status must be maintained.

The substitute part C1812C331JHGAC7800 meets all these criteria. While the substitute features C0G/NP0 temperature coefficient (versus X7R on the main part) and tighter tolerance (±5% versus ±20%), these represent improved electrical characteristics that do not prevent substitution. The substitute maintains identical capacitance, voltage rating, package dimensions, and compliance certifications.

Parameter Comparison

Engineering Selection Recommendations

Both the 1812J3K00331MXT and C1812C331JHGAC7800 are active production parts with full RoHS3 compliance and REACH unaffected status, ensuring regulatory compliance for current and future applications. The substitute part C1812C331JHGAC7800 offers improved tolerance specification (±5% versus ±20%), which may provide enhanced circuit performance in applications where capacitance precision is critical. Both parts maintain identical voltage ratings, package dimensions, and operating temperature ranges, supporting direct substitution in existing designs. Selection between these parts should be based on tolerance requirements, temperature coefficient performance needs, and component availability.

Frequently Asked Questions (FAQ)

Q: Can C1812C331JHGAC7800 be used as a direct replacement for 1812J3K00331MXT?

A: Yes. Both parts share identical capacitance (330 pF), voltage rating (3000V), package form factor (1812/4532 Metric), operating temperature range (-55°C to 125°C), and compliance certifications. The substitute features improved tolerance and different temperature coefficient characteristics that do not prevent substitution.

Q: What is the difference between X7R and C0G/NP0 temperature coefficients?

A: X7R provides ±15% capacitance change across the operating temperature range. C0G/NP0 provides superior temperature stability with minimal capacitance variation. C0G/NP0 is preferred for applications requiring stable capacitance across temperature extremes.

Q: Are the physical dimensions identical between these parts?

A: Both parts use the 1812 (4532 Metric) package with identical length (4.50mm) and width (3.20mm). Maximum thickness differs slightly: 1812J3K00331MXT is 2.50mm maximum, while C1812C331JHGAC7800 is 2.70mm maximum. This minor difference does not affect PCB layout compatibility for standard applications.

Q: Do both parts meet current regulatory requirements?

A: Yes. Both parts are ROHS3 compliant and REACH unaffected, meeting current environmental and regulatory standards for electronic component manufacturing and use.

Q: Which part should be selected for high-precision circuit applications?

A: C1812C331JHGAC7800 is recommended for applications requiring tighter capacitance tolerance. The ±5% tolerance specification provides superior precision compared to the ±20% tolerance of 1812J3K00331MXT.