1206J1K20331MXT Ceramic Capacitor - Equivalent & Substitute Parts

Part Overview

The 1206J1K20331MXT is a 330 pF ceramic capacitor manufactured by Knowles Syfer, rated for 1200V (1.2kV) operation with X7R temperature coefficient characteristics. This surface-mount multilayer ceramic capacitor (MLCC) is designed for general-purpose applications requiring stable capacitance across the operating temperature range of -55°C to 125°C. The part is currently in active production status with RoHS3 compliance and unlimited moisture sensitivity level (MSL 1). Substitute parts are identified when equivalent electrical performance and mechanical compatibility are required due to inventory availability, lead time considerations, or design flexibility needs.

Substiute Parts

1206J1K20331MXT

Knowles SyferIn Stock: 9701206J1K20331MXT Datasheet

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KGM31AR73D331KU

KYOCERA AVXIn Stock: 12998KGM31AR73D331KU Datasheet

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Key Parameters

Substitute Part Grouping Explanation

Substitution of the 1206J1K20331MXT is permissible when the following criteria are met:

Critical Parameters for Substitution:

• Capacitance value: 330 pF (exact match required)
• Temperature coefficient: X7R (ensures stable performance across operating range)
• Package / Case: 1206 (3216 Metric) (mechanical and electrical compatibility)
• Mounting type: Surface Mount, MLCC (assembly process compatibility)
• Voltage rating: Equal to or greater than 1200V (1.2kV) (ensures safe operation margin)
• Operating temperature range: -55°C to 125°C minimum (functional requirement)
• RoHS3 compliance: Required (regulatory requirement)

The identified substitute part KGM31AR73D331KU meets all substitution criteria with an upgraded voltage rating of 2000V (2kV), providing enhanced voltage margin while maintaining identical capacitance, temperature coefficient, and package specifications.

Parameter Comparison

Engineering Selection Recommendations

Both the 1206J1K20331MXT and KGM31AR73D331KU are active production parts with ROHS3 compliance and identical moisture sensitivity ratings. The KGM31AR73D331KU substitute offers a higher voltage rating (2000V versus 1200V), which provides additional operational margin in high-voltage applications. The substitute part features a tighter capacitance tolerance (±10% versus ±20%), which may be advantageous in precision circuit designs. Physical dimensions show minor variations: the substitute is 0.004" (0.10mm) longer and 0.008" (0.20mm) thicker, which must be verified against PCB layout constraints and clearance requirements. Both parts maintain identical electrical performance characteristics across the specified operating temperature range and are suitable for general-purpose applications.

Frequently Asked Questions (FAQ)

Q: Can KGM31AR73D331KU be used as a direct replacement for 1206J1K20331MXT?

A: Yes, the KGM31AR73D331KU is electrically and mechanically compatible as a substitute. Both parts share identical capacitance (330 pF), temperature coefficient (X7R), operating temperature range (-55°C to 125°C), and package specification (1206 / 3216 Metric). Physical dimensions differ slightly; verification against PCB layout is required.

Q: What are the key differences between these two parts?

A: The primary differences are voltage rating (1200V versus 2000V), capacitance tolerance (±20% versus ±10%), and physical dimensions. The substitute part provides higher voltage capability and tighter tolerance specifications.

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

A: The KGM31AR73D331KU is slightly larger (0.130" L x 0.063" W versus 0.126" L x 0.063" W) and thicker (0.071" maximum versus 0.063" maximum). Confirm that PCB footprint, component clearance, and height restrictions accommodate these dimensional variations.

Q: Do both parts meet the same compliance requirements?

A: Yes, both parts are ROHS3 compliant, REACH unaffected, and classified under ECCN EAR99. Both carry MSL 1 (unlimited) moisture sensitivity rating.

Q: Which part should be selected for new designs?

A: Selection depends on application requirements. For circuits requiring 1200V operation with standard tolerance, either part is suitable. For applications benefiting from higher voltage margin or tighter tolerance specifications, the KGM31AR73D331KU is appropriate. Verify physical dimensions against PCB constraints in both cases.