MEXY2A102K Film Capacitor Equivalent & Substitute Parts

Part Overview

The MEXY2A102K is a 1000 pF film capacitor manufactured by Cornell Dubilier Electronics (CDE), designed for EMI and RFI suppression applications. This radial through-hole component features a polyester metallized dielectric with 275V AC rating and ±10% capacitance tolerance. The product is classified as obsolete, making identification of functionally equivalent alternatives necessary for ongoing system maintenance and new design implementations where legacy specifications must be maintained or exceeded.

Substiute Parts

MEXY2A102K

Cornell Dubilier Electronics (CDE)In Stock: 947MEXY2A102K Datasheet

Current PartRFQ

B32021A3102M000

EPCOS - TDK ElectronicsIn Stock: 24444B32021A3102M000 Datasheet

SimilarRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution of the MEXY2A102K is based on the following electrical and mechanical compatibility criteria:

Primary Matching Criteria:

• Capacitance value: 1000 pF (exact match required)
• Voltage rating: Minimum 275V AC (substitute may exceed this specification)
• Mounting configuration: Through-hole radial package
• Dielectric classification: Film capacitor (polyester or polypropylene acceptable)
• Safety ratings: X2 or Y2 classification for EMI/RFI suppression

Secondary Compatibility Factors:

• Operating temperature range must encompass or exceed -40°C to 100°C
• Tolerance specification must be compatible with circuit design margins
• RoHS3 compliance required for modern manufacturing standards
• Physical dimensions should accommodate existing PCB footprints

The B32021A3102M000 qualifies as a functional substitute based on matching capacitance, exceeding voltage requirements, maintaining through-hole radial configuration, and providing superior temperature range and voltage rating specifications.

Parameter Comparison

Engineering Selection Recommendations

Substitution Feasibility:

The B32021A3102M000 is electrically and mechanically compatible with the MEXY2A102K for EMI/RFI suppression applications based on the following factors:

1. Electrical Compatibility: Both components maintain 1000 pF capacitance with film dielectric construction. The substitute's 300V AC rating exceeds the original 275V requirement, providing additional voltage margin. The ±20% tolerance of the substitute is acceptable for EMI/RFI filtering where precise capacitance values are not critical to circuit function.

2. Regulatory Compliance: Both components are ROHS3 compliant and REACH unaffected, meeting current environmental and regulatory requirements for manufacturing and deployment.

3. Product Status: The original MEXY2A102K is obsolete, while the B32021A3102M000 is active production. This status difference makes the substitute the appropriate choice for new designs and ongoing system support.

4. Temperature Performance: The substitute's -40°C to 110°C operating range exceeds the original -40°C to 100°C specification, providing enhanced thermal margin.

5. Physical Considerations: The substitute is physically smaller with different lead spacing (10.00mm vs. 12.50mm) and reduced height (9.00mm vs. 12.00mm). PCB layout verification is required to confirm footprint compatibility before implementation.

6. Safety Ratings: The substitute maintains Y2 classification. The original X2 rating is not present in the substitute; circuit design must confirm that Y2 classification alone is sufficient for the intended application.

Frequently Asked Questions (FAQ)

Q: Can the B32021A3102M000 directly replace the MEXY2A102K without PCB modifications?

A: Direct replacement depends on PCB layout. The substitute has different lead spacing (10.00mm vs. 12.50mm) and smaller physical dimensions. Footprint compatibility must be verified before soldering. If the original PCB was designed specifically for the MEXY2A102K lead spacing, PCB modification or adapter solutions may be required.

Q: What is the significance of the different tolerance specifications (±10% vs. ±20%)?

A: For EMI/RFI suppression applications, the ±20% tolerance of the substitute is functionally acceptable. The wider tolerance does not significantly impact filtering performance in typical suppression circuits. If the original design requires tighter tolerance control, component selection or circuit redesign may be necessary.

Q: Why does the substitute have a DC voltage rating when the original does not?

A: The B32021A3102M000 is specified with both AC and DC ratings (300V AC / 1500V DC), while the MEXY2A102K is specified only for AC operation. This difference reflects different product specifications and testing standards between manufacturers. For AC-only applications, the DC rating is not relevant to substitution compatibility.

Q: Is the Y2 rating of the substitute equivalent to the X2, Y2 rating of the original?

A: X2 and Y2 are distinct safety classifications for capacitors used in EMI suppression. The original component carries both ratings, while the substitute carries only Y2. Circuit design must confirm that Y2 classification alone satisfies the application requirements. If X2 classification is mandatory, the substitute may not be appropriate.

Q: What is the impact of the substitute's higher operating temperature range?

A: The substitute's -40°C to 110°C range exceeds the original -40°C to 100°C specification. This provides additional thermal margin and may improve reliability in elevated temperature environments. For applications operating within the original temperature range, the substitute's extended range presents no disadvantage.

Q: How should lead spacing differences be addressed in PCB design?

A: The substitute's 10.00mm lead spacing differs from the original 12.50mm spacing. If the PCB footprint was designed for the original component, physical verification of hole alignment is required. Options include: (1) confirming the PCB can accommodate the smaller spacing, (2) modifying the PCB layout, or (3) using mechanical adapters if available.

Q: Is the smaller physical size of the substitute a concern?

A: The substitute is smaller in all dimensions (length, width, and height). This generally presents no technical disadvantage and may provide benefits in space-constrained designs. Verify that reduced height (9.00mm vs. 12.00mm) does not create clearance issues with adjacent components or enclosure constraints.

Q: What inventory considerations apply to this substitution?

A: The substitute has significantly higher stock availability (24,363 pcs vs. 877 pcs), ensuring reliable supply for ongoing production and maintenance. The original component's obsolete status and limited inventory make the substitute the practical choice for long-term system support.