Equivalent & Substitute Parts for 1812J1K50331MXT

Part Overview

The 1812J1K50331MXT is a 330 pF ceramic capacitor manufactured by Knowles Syfer, rated for 1500V (1.5kV) with X7R temperature coefficient in 1812 (4532 Metric) surface mount package. This component is classified as Active product status with full RoHS3 compliance and unlimited moisture sensitivity level (MSL 1). Alternative equivalent parts may be required due to application-specific voltage requirements, tolerance specifications, or supply chain considerations while maintaining compatibility with the 1812 package footprint and core electrical characteristics.

Substiute Parts

1812J1K50331MXT

Knowles SyferIn Stock: 10661812J1K50331MXT 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 1812J1K50331MXT is determined by the following mandatory parameters:

• Capacitance Value: Must be 330 pF
• Package / Case: Must be 1812 (4532 Metric) for mechanical and electrical compatibility
• Mounting Type: Must be Surface Mount, MLCC
• Operating Temperature Range: Must support -55°C ~ 125°C
• Compliance: Must maintain RoHS3 compliance and MSL 1 rating

The substitute parts listed below meet these core requirements. Voltage rating and temperature coefficient may vary based on application requirements, provided the substitute maintains or exceeds the minimum voltage specification and operates within the specified temperature range.

Parameter Comparison

Engineering Selection Recommendations

Both KEMET substitute parts (C1812C331JHGAC7800 and C1812C331JZGAC7800) are qualified alternatives to the 1812J1K50331MXT based on the following engineering criteria:

Electrical Compatibility: All three parts maintain identical 330 pF capacitance and support the full -55°C ~ 125°C operating temperature range. The substitute parts feature improved tolerance (±5% versus ±20%), providing tighter capacitance control.

Voltage Margin: Both KEMET substitutes exceed the original 1500V rating. The C1812C331JHGAC7800 provides 3000V rating, while the C1812C331JZGAC7800 provides 2500V rating. Either option offers enhanced voltage margin for applications requiring higher transient protection or derating considerations.

Temperature Coefficient: The substitute parts employ C0G/NP0 temperature coefficient, which provides superior temperature stability compared to X7R. This characteristic is beneficial for precision applications requiring minimal capacitance drift across the operating temperature range.

Compliance & Certification: All parts maintain ROHS3 compliance, MSL 1 (Unlimited) rating, and Active product status, ensuring long-term availability and regulatory alignment.

Physical Compatibility: All parts share identical 1812 (4532 Metric) package footprint and surface mount configuration. The C1812C331JZGAC7800 offers the thinnest profile (0.071" / 1.80mm), which may be advantageous for space-constrained applications.

Frequently Asked Questions (FAQ)

Q: Can C1812C331JHGAC7800 or C1812C331JZGAC7800 be used as direct replacements for 1812J1K50331MXT?

A: Yes, both KEMET parts are direct substitutes. They maintain the same 330 pF capacitance, 1812 package footprint, surface mount configuration, and operating temperature range. The higher voltage ratings and improved tolerance provide enhanced performance characteristics.

Q: What is the difference between C1812C331JHGAC7800 and C1812C331JZGAC7800?

A: Both parts are manufactured by KEMET with identical 330 pF capacitance and ±5% tolerance. The primary differences are voltage rating (3000V versus 2500V) and physical thickness (0.106" versus 0.071"). Select based on application voltage requirements and PCB space constraints.

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

A: The KEMET C0G/NP0 ceramic formulation provides tighter tolerance control compared to the X7R formulation used in the original part. This is a performance advantage, not a limitation, offering improved capacitance accuracy for precision circuit design.

Q: Are there any PCB layout considerations when substituting these parts?

A: All three parts use identical 1812 (4532 Metric) package footprint and surface mount configuration. The C1812C331JZGAC7800 has reduced thickness (0.071" versus 0.098"), which may require verification of solder joint clearance in high-density assemblies, though standard 1812 footprints accommodate this variation.

Q: Do all substitute parts maintain the same compliance certifications?

A: Yes, all parts are ROHS3 compliant with MSL 1 (Unlimited) rating and REACH Unaffected status. Compliance certifications are equivalent across all three options.

Q: Which substitute should be selected for high-voltage applications?

A: The C1812C331JHGAC7800 with 3000V rating provides maximum voltage margin. For applications rated at 2500V or below, the C1812C331JZGAC7800 is suitable and offers a thinner profile for space-constrained designs.