MPXQP68K Film Capacitor Equivalent & Substitute Parts

Part Overview

The MPXQP68K is a 0.68 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 MPXQP68K 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 systems utilizing this component.

Substiute Parts

MPXQP68K

Cornell Dubilier Electronics (CDE)In Stock: 1088MPXQP68K Datasheet

Current PartRFQ

R46KR368000M1K

KEMETIn Stock: 797R46KR368000M1K Datasheet

SimilarRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution of the MPXQP68K is determined by strict alignment of the following critical parameters:

Mandatory Match Criteria:

• Capacitance value: 0.68 µF (exact match required)
• Tolerance: ±10% (substitute tolerance must be equal or tighter)
• Dielectric material: Polypropylene (PP), Metallized (electrical performance requirement)
• Mounting type: Through Hole, Radial (PCB assembly compatibility)
• Lead spacing: 1.083" (27.50mm) (footprint compatibility)
• Safety rating: X2 (regulatory requirement)

Minimum Performance Requirements:

• Voltage rating - AC: Must equal or exceed 275V
• Operating temperature range: Must cover -40°C to 100°C minimum
• RoHS3 compliance: Required for regulatory alignment

The substitute part R46KR368000M1K meets all mandatory criteria and exceeds minimum performance requirements through an extended DC voltage rating (560V) and expanded operating temperature range (-40°C ~ 110°C).

Parameter Comparison

Engineering Selection Recommendations

The R46KR368000M1K (KEMET) is a direct functional substitute for the obsolete MPXQP68K (CDE) based on the following engineering criteria:

Electrical Equivalence: All critical electrical parameters align: capacitance (0.68 µF), tolerance (±10%), AC voltage rating (275V), dielectric material (polypropylene metallized), and safety classification (X2). The substitute provides additional DC voltage rating capability (560V), which does not compromise the original application but extends operational flexibility.

Mechanical Compatibility: Lead spacing (27.50mm) and mounting type (through-hole radial) are identical, ensuring PCB footprint compatibility. The substitute component is physically smaller in width (9.00mm vs. 11.00mm) and height (17.10mm vs. 20.50mm), which presents no compatibility issues and may provide layout advantages in space-constrained designs.

Regulatory and Compliance Alignment: Both components maintain ROHS3 compliance, REACH unaffected status, and identical export classification (EAR99). Regulatory requirements are fully satisfied.

Supply Chain Status: The MPXQP68K is obsolete with limited remaining inventory (998 pcs). The R46KR368000M1K is active production status with current availability (780 pcs), ensuring long-term supply continuity for ongoing applications.

Frequently Asked Questions (FAQ)

Q: Can the R46KR368000M1K replace the MPXQP68K in existing designs without PCB modification?

A: Yes. The lead spacing (27.50mm) and mounting type (through-hole radial) are identical. The substitute component is physically smaller, which eliminates any clearance concerns. No PCB layout changes are required.

Q: What is the significance of the 560V DC rating on the substitute part?

A: The MPXQP68K does not specify a DC voltage rating. The R46KR368000M1K provides 560V DC rating, which exceeds typical AC-only application requirements. This additional rating does not affect AC performance and provides design margin for applications requiring DC voltage exposure.

Q: Are the operating temperature ranges compatible?

A: Yes. The MPXQP68K operates from -40°C to 100°C. The R46KR368000M1K extends this range to -40°C to 110°C, fully covering the original specification with additional margin.

Q: Do both parts meet the same safety and regulatory standards?

A: Yes. Both components carry X2 safety rating, ROHS3 compliance, REACH unaffected status, and identical ECCN/HTSUS classifications. Regulatory requirements are fully aligned.

Q: Why is the substitute component smaller in physical dimensions?

A: The R46KR368000M1K uses more efficient capacitor construction technology while maintaining identical electrical performance. Smaller physical size reflects modern manufacturing advances and does not indicate reduced capability or reliability.

Q: Is the ±10% tolerance specification identical between both parts?

A: Yes. Both the MPXQP68K and R46KR368000M1K specify ±10% capacitance tolerance, ensuring equivalent circuit performance and design margin.

Q: What is the difference between the MPX and R46 series designations?

A: These are manufacturer-specific series identifiers. The MPX series is Cornell Dubilier's product line; the R46 series is KEMET's equivalent product line. Series designation does not affect electrical or mechanical compatibility when all critical parameters match.