1808J2K50331MXT Equivalent & Substitute Parts

Part Overview

The 1808J2K50331MXT is a 330 pF ceramic capacitor rated for 2500V (2.5kV) 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 1808 (4520 Metric) package form factor. The part is currently active and in stock, with ROHS3 compliance and unlimited moisture sensitivity rating (MSL 1). Equivalent and substitute parts are identified when electrical specifications, mechanical dimensions, and compliance certifications align with application requirements.

Substiute Parts

1808J2K50331MXT

Knowles SyferIn Stock: 11271808J2K50331MXT Datasheet

Current PartRFQ

C1808C331JZGAC7800

KEMETIn Stock: 1221C1808C331JZGAC7800 Datasheet

MFR RecommendedRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution eligibility for the 1808J2K50331MXT is determined by the following critical parameters:

Capacitance value must be 330 pF. Voltage rating must be 2500V or higher. Package must be 1808 (4520 Metric) to ensure mechanical and electrical compatibility with PCB layouts. Mounting type must be surface mount MLCC. Operating temperature range must encompass -55°C to 125°C. RoHS3 compliance and MSL 1 rating are required for regulatory and manufacturing process compatibility.

Temperature coefficient may vary between X7R and C0G/NP0 classifications. X7R provides ±15% capacitance change across the operating temperature range, while C0G/NP0 provides superior stability with ±0.3% change. This difference is acceptable in substitution when the application does not require the tighter tolerance of C0G/NP0.

Tolerance may be tighter than ±20% without affecting substitution eligibility, as tighter tolerances represent improved performance characteristics.

Parameter Comparison

Engineering Selection Recommendations

The C1808C331JZGAC7800 (KEMET) is a qualified substitute for the 1808J2K50331MXT (Knowles Syfer) based on matching electrical specifications, package compatibility, and regulatory compliance.

Both parts meet ROHS3 compliance requirements and carry MSL 1 rating, confirming suitability for standard manufacturing processes without special moisture handling. Both parts are active products with confirmed inventory availability.

The KEMET substitute offers improved capacitance tolerance (±5% versus ±20%), which provides tighter value control without introducing incompatibility. The C0G/NP0 temperature coefficient of the KEMET part provides superior temperature stability compared to the X7R coefficient of the original part. This represents an upgrade in performance characteristics.

Physical dimensions show minor variations: the KEMET part is slightly larger in length (4.70mm versus 4.50mm) and thickness (2.15mm versus 2.00mm). PCB layout verification is necessary to confirm that these dimensional differences do not create mechanical interference in the target application.

Frequently Asked Questions (FAQ)

Q: Can the C1808C331JZGAC7800 be used as a direct replacement for the 1808J2K50331MXT?

A: Yes, the C1808C331JZGAC7800 meets all critical electrical specifications: 330 pF capacitance, 2500V voltage rating, 1808 package, and surface mount configuration. Both parts operate across -55°C to 125°C and carry ROHS3 compliance. Physical dimensions differ slightly; PCB layout verification is required to confirm no mechanical conflicts exist.

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 ±0.3% capacitance change, representing significantly superior temperature stability. The KEMET substitute with C0G/NP0 coefficient will maintain more stable capacitance values across temperature variations.

Q: Are there any compliance or regulatory differences between these parts?

A: Both parts are ROHS3 compliant, REACH unaffected, and carry EAR99 ECCN classification. Both have MSL 1 rating (unlimited moisture sensitivity). No compliance or regulatory differences exist between the two parts.

Q: What are the dimensional constraints for substitution?

A: The KEMET substitute is 0.20mm longer (4.70mm versus 4.50mm) and 0.15mm thicker (2.15mm versus 2.00mm). These differences are within typical PCB design tolerances for 1808 package components, but layout verification is necessary to confirm no mechanical interference with adjacent components or board features.

Q: Does the tighter tolerance of the KEMET part affect compatibility?

A: No. The KEMET part tolerance of ±5% is tighter than the original ±20% tolerance. Tighter tolerances represent improved performance and do not create incompatibility. The substitute will perform within the original part's tolerance band.