MPXQS33K Film Capacitor Equivalent & Substitute Parts

Part Overview

The MPXQS33K is a 0.033 µF film capacitor manufactured by Cornell Dubilier Electronics (CDE) with a 275V AC rating, designed for EMI and RFI suppression applications. This component features a metallized polypropylene dielectric in a radial through-hole package configuration.

The MPXQS33K is classified as obsolete. Identifying equivalent and substitute parts is necessary to maintain design continuity, ensure supply chain availability, and support ongoing production or repair requirements for legacy systems utilizing this component.

Substiute Parts

MPXQS33K

Cornell Dubilier Electronics (CDE)In Stock: 1002MPXQS33K Datasheet

Current PartRFQ

R46KF233000M1K

KEMETIn Stock: 14593R46KF233000M1K Datasheet

SimilarRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution of the MPXQS33K is determined by strict equivalence across the following critical parameters:

Mandatory Matching Parameters:

• Capacitance value: 0.033 µF
• Tolerance: ±10%
• Voltage Rating - AC: 275V minimum
• Dielectric Material: Polypropylene (PP), Metallized
• Mounting Type: Through Hole
• Package / Case: Radial
• Lead Spacing: 0.394" (10.00mm)
• Ratings Classification: X2

Allowable Variations:

• Voltage Rating - DC: Substitute may exceed the original specification
• Operating Temperature Range: Substitute may exceed the original specification
• Physical dimensions (length, width, height): Minor variations acceptable within standard package tolerances
• Product Status: Active status preferred for ongoing availability

The KEMET R46KF233000M1K meets all mandatory matching parameters and qualifies as a direct substitute for the obsolete MPXQS33K.

Parameter Comparison

Engineering Selection Recommendations

The KEMET R46KF233000M1K is a qualified substitute for the obsolete Cornell Dubilier Electronics MPXQS33K based on the following engineering criteria:

Electrical Equivalence: Both components share identical capacitance (0.033 µF), tolerance (±10%), AC voltage rating (275V), dielectric material (metallized polypropylene), and X2 ratings classification. These parameters are critical for EMI and RFI suppression circuit performance.

Mechanical Compatibility: Lead spacing (0.394" / 10.00mm) and mounting type (through-hole radial) are identical, ensuring direct PCB footprint compatibility. The KEMET substitute is physically smaller in width and height, which presents no compatibility issues for existing PCB layouts.

Regulatory Compliance: Both components maintain ROHS3 compliance and REACH unaffected status, satisfying current environmental and regulatory requirements. Both carry EAR99 export classification.

Supply Chain Advantage: The R46KF233000M1K is classified as active product status with 14,523 units in stock, compared to the obsolete MPXQS33K with limited remaining inventory (985 units). Selection of the KEMET substitute ensures long-term supply availability and reduces obsolescence risk.

Enhanced Performance Margins: The KEMET substitute provides higher DC voltage rating (560V versus unspecified) and extended operating temperature range (-40°C to 110°C versus -40°C to 100°C), offering improved performance margins without compromising the original circuit design intent.

Frequently Asked Questions (FAQ)

Q: Can the KEMET R46KF233000M1K be used as a direct replacement for the MPXQS33K in existing designs?

A: Yes. The R46KF233000M1K meets all mandatory electrical and mechanical parameters required for direct substitution. Identical capacitance, tolerance, AC voltage rating, dielectric material, lead spacing, and mounting type ensure functional equivalence in EMI and RFI suppression applications.

Q: What are the physical differences between these two components?

A: The KEMET R46KF233000M1K is slightly smaller in width (0.197" versus 0.236") and height (0.437" versus 0.492"). These dimensional reductions do not affect PCB footprint compatibility, as lead spacing remains identical at 0.394" (10.00mm).

Q: Does the higher DC voltage rating of the KEMET substitute affect circuit performance?

A: No. The higher DC voltage rating (560V) of the R46KF233000M1K does not negatively impact circuit performance. This represents an enhanced performance margin and does not alter the component's behavior in AC-rated applications.

Q: Are both components RoHS compliant?

A: Yes. Both the MPXQS33K and R46KF233000M1K are ROHS3 compliant and REACH unaffected, meeting current environmental and regulatory standards.

Q: Why is the MPXQS33K classified as obsolete?

A: The MPXQS33K is no longer in active production by Cornell Dubilier Electronics. The KEMET R46KF233000M1K provides an active, readily available alternative with equivalent electrical and mechanical specifications.

Q: What is the X2 ratings classification?

A: X2 is a safety ratings classification for capacitors used in AC mains applications. Both components carry this classification, confirming their suitability for EMI and RFI suppression in line-connected circuits.

Q: Are there any temperature performance differences?

A: The KEMET substitute operates across a slightly wider temperature range (-40°C to 110°C versus -40°C to 100°C). This extended range provides additional operational margin without affecting performance in the original design's operating conditions.