Equivalent & Substitute Parts for 1812J2K50331MXT

Part Overview

The 1812J2K50331MXT is a 330 pF ceramic capacitor manufactured by Knowles Syfer, rated for 2500V (2.5kV) with X7R temperature coefficient in 1812 (4532 Metric) surface mount package. This component is designed for general purpose applications requiring high voltage performance in compact form factor. The part is currently active in production with 1133 units in stock.

Substitute parts are identified to provide design flexibility when the primary part is unavailable or when alternative electrical characteristics better suit specific application requirements while maintaining mechanical and electrical compatibility.

Substiute Parts

1812J2K50331MXT

Knowles SyferIn Stock: 11711812J2K50331MXT Datasheet

Current PartRFQ

C1812C331JHGAC7800

KEMETIn Stock: 1332C1812C331JHGAC7800 Datasheet

MFR RecommendedRFQ

C1812C331JZGAC7800

KEMETIn Stock: 1407C1812C331JZGAC7800 Datasheet

MFR RecommendedRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution eligibility for the 1812J2K50331MXT is determined by the following critical parameters:

Mandatory Compatibility Parameters:

• Capacitance value: 330 pF (exact match required)
• Package / Case: 1812 (4532 Metric) (exact match required)
• Mounting Type: Surface Mount, MLCC (exact match required)
• Operating Temperature Range: -55°C ~ 125°C (minimum requirement)
• Voltage Rating: Equal to or greater than 2500V
• RoHS Status: ROHS3 Compliant (regulatory requirement)
• Moisture Sensitivity Level: 1 (Unlimited) (handling requirement)

Allowable Variations:

• Temperature Coefficient: X7R or C0G/NP0 (both acceptable for general purpose applications)
• Tolerance: ±20% or tighter (±5% is acceptable)
• Physical thickness: Variation permitted if within package envelope

The two identified substitute parts meet all mandatory compatibility parameters while offering improved tolerance specifications and alternative temperature coefficient characteristics.

Parameter Comparison

Engineering Selection Recommendations

C1812C331JHGAC7800 (KEMET) - 3kV Variant: This substitute provides a higher voltage rating of 3000V with improved tolerance of ±5% compared to the original ±20%. The C0G/NP0 temperature coefficient offers superior stability across the operating temperature range. Physical thickness of 0.106" (2.70mm) is marginally greater than the original but remains within typical 1812 package envelope specifications. All regulatory certifications (ROHS3, MSL 1) are maintained. This option is suitable for applications where enhanced voltage margin and tighter capacitance tolerance provide design benefits.

C1812C331JZGAC7800 (KEMET) - 2.5kV Variant: This substitute maintains the exact voltage rating of 2500V as the original part while providing ±5% tolerance improvement. The C0G/NP0 temperature coefficient ensures stable performance across temperature extremes. Physical thickness of 0.071" (1.80mm) is significantly thinner than the original 0.098" (2.50mm), offering potential advantages for space-constrained PCB layouts. All regulatory certifications remain compliant. This option provides direct voltage compatibility with enhanced tolerance and reduced form factor.

Both substitutes are manufactured by KEMET, an active producer with confirmed inventory availability, and maintain full compliance with RoHS3 and MSL 1 requirements.

Frequently Asked Questions (FAQ)

Q: Can C1812C331JHGAC7800 or C1812C331JZGAC7800 be used as direct replacements for 1812J2K50331MXT?

A: Yes, both KEMET parts are direct substitutes. They share identical capacitance (330 pF), package (1812/4532 Metric), mounting type (Surface Mount MLCC), and operating temperature range (-55°C ~ 125°C). All three parts are ROHS3 compliant with MSL 1 rating.

Q: What is the difference between the two KEMET substitutes?

A: The primary differences are voltage rating and physical thickness. C1812C331JHGAC7800 is rated for 3000V with 0.106" (2.70mm) thickness, while C1812C331JZGAC7800 is rated for 2500V with 0.071" (1.80mm) thickness. Both offer ±5% tolerance and C0G/NP0 temperature coefficient. Select based on voltage margin requirements and PCB space constraints.

Q: Why do the substitute parts have ±5% tolerance instead of ±20%?

A: The KEMET substitutes employ tighter manufacturing tolerances as part of their product specification. This provides improved capacitance accuracy for applications requiring closer value control. The ±5% tolerance is a subset of the ±20% tolerance range, ensuring compatibility with designs accepting the original ±20% specification.

Q: Are there any physical compatibility concerns with the different thicknesses?

A: All three parts conform to the 1812 (4532 Metric) package standard. Thickness variations (0.098", 0.106", 0.071") fall within acceptable envelope limits for this package class. Verify PCB footprint and assembly clearances for your specific design if using the thicker variant (C1812C331JHGAC7800).

Q: What is the significance of C0G/NP0 versus X7R temperature coefficient?

A: Both temperature coefficients are suitable for general purpose applications and support the -55°C ~ 125°C operating range. C0G/NP0 provides superior stability with minimal capacitance drift across temperature extremes, while X7R allows slightly greater capacitance variation. The choice depends on application sensitivity to capacitance changes over temperature.

Q: Are all three parts available in Tape & Reel (TR) packaging?

A: Yes, all three parts are supplied in Tape & Reel packaging suitable for automated assembly processes.