MEXY2A155K Film Capacitor Equivalent & Substitute Parts

Part Overview

The MEXY2A155K is a 1.5 µF film capacitor manufactured by Cornell Dubilier Electronics (CDE) with a 275V AC rating, polyester metallized dielectric, and radial through-hole mounting. This component is classified as obsolete, making identification of functionally equivalent alternatives necessary for ongoing system maintenance and new design implementations where this specific part is no longer available from primary sources.

Substiute Parts

MEXY2A155K

Cornell Dubilier Electronics (CDE)In Stock: 1064MEXY2A155K Datasheet

Current PartRFQ

BFC233820155

Vishay Beyschlag/Draloric/BC ComponentsIn Stock: 3250BFC233820155 Datasheet

SimilarRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution of the MEXY2A155K is based on the following criteria:

Mandatory Matching Parameters:

• Capacitance value: 1.5 µF (exact match required)
• Mounting type: Through-hole radial configuration
• Lead spacing: 1.083" (27.50mm) for PCB compatibility
• Applications: EMI/RFI suppression functionality

Allowable Variations:

• Voltage rating: Substitute must equal or exceed 275V AC
• Dielectric material: Alternative metallized film types acceptable if electrical performance is maintained
• Tolerance: Substitute tolerance of ±20% is acceptable in applications where ±10% tolerance is not critical
• Operating temperature range: Substitute range may extend beyond -40°C to 100°C
• Regulatory compliance: ROHS3 compliance and EAR99 classification maintained

The BFC233820155 qualifies as a substitute based on matching capacitance, mounting configuration, lead spacing, and functional application, while providing enhanced voltage ratings and extended temperature range.

Parameter Comparison

Engineering Selection Recommendations

Primary Substitute: BFC233820155

The BFC233820155 is the qualified substitute for the obsolete MEXY2A155K based on the following engineering criteria:

1. Functional Equivalence: Both components provide 1.5 µF capacitance for EMI/RFI suppression applications with identical lead spacing (27.50mm) and through-hole radial mounting, ensuring direct PCB compatibility without layout modifications.

2. Voltage Compliance: The BFC233820155 provides 310V AC rating, which exceeds the 275V AC requirement of the MEXY2A155K, ensuring adequate safety margin in the application circuit.

3. Product Availability: The MEXY2A155K is classified as obsolete with no ongoing manufacturing. The BFC233820155 is active production with 3221 units in stock, ensuring supply chain continuity.

4. Regulatory Compliance: Both components maintain ROHS3 compliance and REACH unaffected status, meeting current environmental and regulatory requirements for electronic component procurement.

5. Temperature Performance: The BFC233820155 operating range (-55°C to 110°C) exceeds the MEXY2A155K range (-40°C to 100°C), providing enhanced thermal margin for applications in variable environmental conditions.

6. Physical Compatibility: The substitute dimensions (31.00mm L x 13.00mm W x 23.00mm H) are compatible with the original footprint. The slightly lower profile (23.00mm vs. 26.50mm) presents no clearance conflicts in standard PCB layouts.

Tolerance Consideration: The BFC233820155 tolerance of ±20% compared to the MEXY2A155K tolerance of ±10% is acceptable for EMI/RFI suppression circuits where capacitance variation within this range does not compromise filtering performance or circuit stability.

Frequently Asked Questions (FAQ)

Q1: Can the BFC233820155 be used as a direct replacement for the MEXY2A155K without PCB modifications?

A: Yes. Both components have identical lead spacing (27.50mm) and radial through-hole mounting configuration. The substitute can be inserted into the existing PCB footprint without layout changes. Physical dimensions are compatible with standard component spacing.

Q2: Why does the substitute have a ±20% tolerance instead of ±10%?

A: The BFC233820155 is manufactured with ±20% tolerance as a standard specification for the MKP338 2 series. For EMI/RFI suppression applications, this tolerance range is functionally acceptable because filtering performance remains effective across the capacitance variation. If the circuit design requires tighter tolerance control, alternative parts with ±10% tolerance should be evaluated.

Q3: The substitute uses polypropylene dielectric instead of polyester. Does this affect performance?

A: Both polyester and polypropylene metallized films are suitable for EMI/RFI suppression. Polypropylene offers slightly different electrical characteristics, including lower dissipation factor and extended temperature range. For the specified application, both dielectric materials provide equivalent filtering performance.

Q4: What is the significance of the 630V DC rating on the substitute when the original part has no DC rating?

A: The MEXY2A155K is specified for AC applications only (275V AC). The BFC233820155 provides both AC (310V) and DC (630V) ratings, offering design flexibility for applications that may require DC voltage capability. The AC rating of 310V is the relevant specification for direct substitution in the original AC application.

Q5: Is the lower height of the substitute (23.00mm vs. 26.50mm) a concern?

A: No. The lower profile of the BFC233820155 (23.00mm seated height) is advantageous for space-constrained designs and presents no compatibility issues. The component will fit within the same vertical clearance envelope as the original part.

Q6: Both parts are rated for EMI/RFI suppression. Are there any application-specific limitations?

A: Both components are suitable for EMI/RFI suppression in the specified voltage and temperature ranges. The substitute's extended temperature range (-55°C to 110°C) provides additional operational margin. No application-specific limitations exist for direct substitution in EMI/RFI filtering circuits.

Q7: What is the inventory status for the substitute part?

A: The BFC233820155 has 3221 units in stock as new original components, ensuring immediate availability. The MEXY2A155K, being obsolete, has limited remaining inventory (1042 units) with no ongoing manufacturing.

Q8: Are there any compliance or certification differences between the two parts?

A: Both components are ROHS3 compliant and REACH unaffected. The MEXY2A155K carries X2 and Y2 ratings; the BFC233820155 carries X2 rating. For AC EMI/RFI suppression applications, the X2 rating is the applicable safety classification. Both parts meet current regulatory requirements.