1808J1K00331MXT Equivalent & Substitute Parts

Part Overview

The 1808J1K00331MXT is a 330 pF ceramic capacitor manufactured by Knowles Syfer, rated for 1000V (1kV) operation with X7R temperature coefficient characteristics. This component is designed for general-purpose applications requiring surface-mount multilayer ceramic capacitor (MLCC) technology in the 1808 (4520 Metric) package format. The part maintains active product status with full RoHS3 compliance and unlimited moisture sensitivity rating (MSL 1). Substitute parts are identified when equivalent capacitance and package specifications are maintained while alternative voltage ratings, tolerance grades, or temperature coefficients may provide enhanced performance characteristics for specific application requirements.

Substiute Parts

1808J1K00331MXT

Knowles SyferIn Stock: 10581808J1K00331MXT Datasheet

Current PartRFQ

C1808C331JZGAC7800

KEMETIn Stock: 1221C1808C331JZGAC7800 Datasheet

MFR RecommendedRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution eligibility for the 1808J1K00331MXT is determined by the following critical parameters:

Primary Matching Criteria:

• Capacitance value: 330 pF (exact match required)
• Package format: 1808 (4520 Metric) (exact match required)
• Mounting type: Surface Mount, MLCC (exact match required)
• Operating temperature range: -55°C ~ 125°C (minimum requirement)

Secondary Compatibility Parameters:

• Voltage rating: Equal to or greater than 1000V
• Tolerance: Equal to or tighter than ±20%
• Temperature coefficient: X7R or equivalent stability class
• RoHS and REACH compliance status

The identified substitute part C1808C331JZGAC7800 (KEMET) satisfies all primary matching criteria and provides enhanced specifications in voltage rating (2500V vs. 1000V) and tolerance (±5% vs. ±20%), making it suitable for applications where higher voltage margin or tighter capacitance tolerance is beneficial.

Parameter Comparison

Engineering Selection Recommendations

Both the 1808J1K00331MXT and C1808C331JZGAC7800 maintain active product status with full RoHS3 compliance and REACH unaffected certification. The primary distinction lies in voltage rating and temperature coefficient classification. The KEMET substitute provides a 2.5kV voltage rating compared to the 1kV specification of the Knowles Syfer original, offering increased voltage margin for applications operating near rated voltage limits. The C0G/NP0 temperature coefficient of the substitute provides superior capacitance stability across temperature extremes compared to X7R characteristics. The tighter ±5% tolerance of the substitute part enables more precise capacitance control in circuits requiring strict value specifications. Selection between these parts should be based on application voltage requirements, temperature stability demands, and tolerance specifications rather than interchangeability alone.

Frequently Asked Questions (FAQ)

Q: Can the KEMET C1808C331JZGAC7800 directly replace the Knowles Syfer 1808J1K00331MXT?

A: Direct replacement is possible from a mechanical and electrical standpoint. Both parts share identical 330 pF capacitance, 1808 package format, and surface-mount configuration. The KEMET substitute operates at higher voltage rating (2500V vs. 1000V) and offers tighter tolerance (±5% vs. ±20%), making it suitable for applications where the original part is specified.

Q: What are the physical dimension differences between these parts?

A: The Knowles Syfer part measures 0.177" L × 0.079" W × 0.079" thickness (4.50mm × 2.00mm × 2.00mm). The KEMET substitute measures 0.185" L × 0.079" W × 0.085" thickness (4.70mm × 2.00mm × 2.15mm). These minor dimensional variations remain within the 1808 package classification and should not affect PCB layout compatibility for standard component spacing.

Q: How do X7R and C0G/NP0 temperature coefficients differ?

A: X7R temperature coefficient provides ±15% capacitance variation across the -55°C to 125°C operating range. C0G/NP0 provides superior stability with minimal capacitance drift across temperature extremes. Applications requiring stable capacitance values across wide temperature ranges benefit from C0G/NP0 characteristics.

Q: Are both parts suitable for high-voltage applications?

A: The original 1808J1K00331MXT is rated for 1000V operation. The KEMET substitute is rated for 2500V, providing enhanced voltage margin. Selection depends on circuit voltage requirements; the substitute offers greater safety margin in high-voltage designs.

Q: Do both parts meet current compliance requirements?

A: Both parts maintain ROHS3 compliance and REACH unaffected status, meeting current environmental and regulatory standards for electronic component manufacturing and use.