MEXY2A154K Film Capacitor Equivalent & Substitute Parts

Part Overview

The MEXY2A154K is a 0.15 µF film capacitor manufactured by Cornell Dubilier Electronics (CDE) rated for 275V AC operation. This component features a metallized polyester dielectric in a radial through-hole package and is designed for EMI and RFI suppression applications. The product is classified as obsolete, making identification of equivalent substitute parts necessary for ongoing design support and procurement continuity.

Substiute Parts

MEXY2A154K

Cornell Dubilier Electronics (CDE)In Stock: 786MEXY2A154K Datasheet

Current PartRFQ

BFC233820154

Vishay Beyschlag/Draloric/BC ComponentsIn Stock: 1684BFC233820154 Datasheet

SimilarRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution of the MEXY2A154K is determined by the following critical parameters:

Capacitance Match: The substitute part must provide 0.15 µF capacitance to maintain circuit function.

Voltage Rating Compatibility: The substitute must meet or exceed the 275V AC requirement of the original design. The substitute part BFC233820154 provides 310V AC and 630V DC ratings, which exceed the original specification and ensure safe operation in the intended application.

Dielectric and Mounting Compatibility: Both the original and substitute parts utilize metallized film dielectrics in radial through-hole packages with identical lead spacing (15.00mm), ensuring mechanical and electrical compatibility on printed circuit boards.

Tolerance Consideration: The original part specifies ±10% tolerance, while the substitute provides ±20% tolerance. This wider tolerance remains acceptable for EMI/RFI suppression applications where exact capacitance values are not critical to circuit performance.

Environmental and Compliance Requirements: Both parts meet ROHS3 compliance, REACH unaffected status, and unlimited moisture sensitivity level (MSL 1), ensuring regulatory and environmental compatibility.

Parameter Comparison

Engineering Selection Recommendations

The BFC233820154 serves as a direct functional substitute for the obsolete MEXY2A154K based on the following engineering criteria:

Capacitance and Voltage Compatibility: Both parts provide identical 0.15 µF capacitance. The substitute's 310V AC rating exceeds the original 275V AC specification, providing additional safety margin in the application circuit.

Physical and Electrical Compatibility: Identical lead spacing (15.00mm) and radial through-hole mounting ensure direct board-level compatibility. The substitute's slightly reduced height (0.472" versus 0.591") presents no mechanical interference issues in standard PCB layouts.

Product Status and Availability: The substitute part is classified as active with 1614 units in stock, ensuring reliable procurement compared to the obsolete original part with limited remaining inventory.

Regulatory Compliance: Both parts maintain ROHS3 compliance and REACH unaffected status, satisfying current environmental and regulatory requirements for new designs and legacy system support.

Dielectric Material Consideration: The substitute utilizes polypropylene (PP) dielectric instead of polyester. Polypropylene film capacitors provide superior performance characteristics in EMI/RFI suppression applications, including lower dissipation factor and improved frequency response.

Frequently Asked Questions (FAQ)

Q: Can the BFC233820154 directly replace the MEXY2A154K on existing circuit boards?

A: Yes. Both parts share identical lead spacing (15.00mm) and radial through-hole mounting configuration. The substitute's reduced height (0.472" versus 0.591") does not create mechanical conflicts in standard PCB designs.

Q: Does the ±20% tolerance of the substitute part affect circuit performance?

A: For EMI and RFI suppression applications, the ±20% tolerance of the BFC233820154 is functionally equivalent to the ±10% tolerance of the original part. Suppression filter circuits do not require precise capacitance values for proper operation.

Q: Why does the substitute part have a higher voltage rating?

A: The BFC233820154 is rated for 310V AC and 630V DC, exceeding the original 275V AC specification. This higher rating provides additional safety margin and allows the substitute to operate reliably in applications with voltage transients or overvoltage conditions.

Q: What is the difference between polyester and polypropylene dielectrics?

A: Both are film dielectric materials suitable for EMI/RFI suppression. Polypropylene offers lower dissipation factor and superior frequency response characteristics, making it preferred for high-frequency filtering applications.

Q: Are both parts compliant with current environmental regulations?

A: Yes. Both the MEXY2A154K and BFC233820154 are ROHS3 compliant and REACH unaffected, meeting current environmental and regulatory requirements for electronic component manufacturing and use.

Q: What is the lead spacing specification, and why is it important?

A: Both parts specify 0.591" (15.00mm) lead spacing, which defines the distance between the two radial leads. This specification ensures the component fits standard PCB footprints designed for 15.00mm spacing, preventing installation errors and ensuring proper electrical connections.

Q: Is the substitute part available in the same packaging format?

A: The substitute part is supplied in bulk packaging, while the original part packaging format is not specified in the available data. Both parts are through-hole radial components with identical lead configurations, ensuring compatibility regardless of packaging format.