Equivalent & Substitute Parts for 1808J1K20331MXT

Part Overview

The 1808J1K20331MXT is a 330 pF ceramic capacitor manufactured by Knowles Syfer, rated for 1200V (1.2kV) operation with X7R temperature coefficient characteristics. This component is classified as an Active product with full RoHS3 compliance and unlimited moisture sensitivity rating (MSL 1). The part is supplied in Surface Mount MLCC format with 1808 (4520 Metric) package dimensions. Substitute parts are identified when equivalent capacitance, voltage rating, package form factor, and compliance certifications align with application requirements.

Substiute Parts

1808J1K20331MXT

Knowles SyferIn Stock: 10421808J1K20331MXT Datasheet

Current PartRFQ

C1808C331JZGAC7800

KEMETIn Stock: 1221C1808C331JZGAC7800 Datasheet

MFR RecommendedRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution of the 1808J1K20331MXT is permissible when the following criteria are met:

• Capacitance value matches at 330 pF
• Package form factor is 1808 (4520 Metric) for mechanical and electrical compatibility
• Voltage rating meets or exceeds 1200V (1.2kV)
• Temperature coefficient provides stable operation across -55°C to 125°C range
• Mounting type remains Surface Mount MLCC
• RoHS3 compliance and MSL 1 rating are maintained

The identified substitute part C1808C331JZGAC7800 (KEMET) satisfies these criteria with enhanced voltage rating (2500V) and improved tolerance specification (±5% versus ±20%), while maintaining identical capacitance, package dimensions, and compliance certifications.

Parameter Comparison

Engineering Selection Recommendations

Both the 1808J1K20331MXT and C1808C331JZGAC7800 are Active products with full RoHS3 compliance and REACH Unaffected status. The substitute part offers superior voltage margin (2500V versus 1200V) and tighter capacitance tolerance (±5% versus ±20%), making it suitable for applications requiring enhanced reliability and precision. Temperature coefficient differences (X7R versus C0G/NP0) reflect distinct dielectric materials; C0G/NP0 provides superior temperature stability, while X7R offers higher capacitance density. Selection between these parts depends on specific application voltage requirements and temperature stability demands within the stated operating range.

Frequently Asked Questions (FAQ)

Q: Can C1808C331JZGAC7800 directly replace 1808J1K20331MXT in existing designs?

A: Yes, provided the application voltage requirement does not exceed 1200V. The substitute part maintains identical capacitance (330 pF), package dimensions (1808/4520 Metric), and mounting characteristics. The higher voltage rating (2500V) and improved tolerance (±5%) present no compatibility issues for circuits designed for 1200V operation.

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

A: Both parts use the 1808 (4520 Metric) package. The main part dimensions are 0.177" L × 0.079" W × 0.079" thickness (4.50mm × 2.00mm × 2.00mm). The substitute part dimensions are 0.185" L × 0.079" W × 0.085" thickness (4.70mm × 2.00mm × 2.15mm). These minor variations remain within standard 1808 package tolerances and do not affect PCB layout compatibility.

Q: How do X7R and C0G/NP0 temperature coefficients affect circuit performance?

A: X7R provides ±15% capacitance variation across the -55°C to 125°C operating range. C0G/NP0 provides superior stability with minimal variation across temperature. For general-purpose applications, both coefficients support the stated operating temperature range. Applications requiring precise capacitance stability across temperature extremes benefit from the C0G/NP0 characteristic of the substitute part.

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

A: The 1808J1K20331MXT is rated for 1200V operation. The substitute C1808C331JZGAC7800 is rated for 2500V, providing enhanced margin for high-voltage circuit designs. Both parts maintain RoHS3 compliance and unlimited moisture sensitivity rating (MSL 1) for demanding environmental conditions.