MPXQS68K Film Capacitor - Equivalent & Substitute Parts

Part Overview

The MPXQS68K is a 0.068 µF film capacitor manufactured by Cornell Dubilier Electronics (CDE) with a 275VAC rating, polypropylene dielectric, and metallized construction for radial mounting. This component is classified as obsolete, making equivalent substitute parts necessary for new designs and repairs where continued availability from the original manufacturer cannot be assured.

Substiute Parts

MPXQS68K

Cornell Dubilier Electronics (CDE)In Stock: 1186MPXQS68K Datasheet

Current PartRFQ

R46KI26800001K

KEMETIn Stock: 2996R46KI26800001K Datasheet

SimilarRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitute compatibility for the MPXQS68K is determined by the following critical parameters:

Essential Matching Parameters:

• Capacitance: 0.068 µF (exact match required)
• Tolerance: ±10% (electrical performance requirement)
• Voltage Rating - AC: 275V (minimum requirement for AC applications)
• Dielectric Material: Polypropylene (PP), Metallized (performance and reliability)
• Mounting Type: Through Hole (PCB compatibility)
• Package / Case: Radial (mechanical compatibility)
• Lead Spacing: 0.591" (15.00mm) (PCB footprint requirement)
• Termination: PC Pins (assembly compatibility)
• Ratings: X2 (safety classification for AC applications)

Compliance & Environmental Parameters:

• RoHS3 Compliance (regulatory requirement)
• Operating Temperature Range: Minimum -40°C ~ 100°C (application requirements)
• REACH Status: REACH Unaffected (supply chain compliance)

The substitute part R46KI26800001K meets all essential parameters while offering enhanced voltage ratings and an extended operating temperature range, making it electrically and mechanically interchangeable with the obsolete MPXQS68K.

Parameter Comparison

Engineering Selection Recommendations

The R46KI26800001K from KEMET is the qualified substitute for the obsolete MPXQS68K. Selection of this substitute is supported by:

Compliance Alignment:

• Both parts maintain ROHS3 compliance
• Both parts are REACH Unaffected
• Both parts carry X2 ratings for AC applications

Product Status Advantage: The R46KI26800001K is listed as Active, ensuring continued availability and supply chain reliability compared to the obsolete MPXQS68K.

Electrical Performance: The R46KI26800001K meets or exceeds all critical electrical parameters: identical capacitance (0.068 µF), tolerance (±10%), and AC voltage rating (275V). The extended DC voltage rating (560V) and elevated maximum operating temperature (110°C vs. 100°C) provide design margin without compromising AC-rated performance.

Mechanical Compatibility: The substitute maintains identical lead spacing (15.00mm) and radial through-hole mounting configuration. The slightly reduced physical dimensions (width and height) are compatible with the original PCB layout and do not introduce installation barriers.

Frequently Asked Questions (FAQ)

Q: Can the R46KI26800001K replace the MPXQS68K in existing designs? A: Yes. The R46KI26800001K matches all critical electrical and mechanical parameters, including capacitance, tolerance, AC voltage rating, dielectric material, mounting type, lead spacing, and X2 rating. The reduced physical size presents no compatibility issues for through-hole PCB mounting.

Q: Why does the R46KI26800001K have a 560V DC rating when the original part has no DC specification? A: The MPXQS68K is specified for 275V AC operation only. The R46KI26800001K's 560V DC rating is an additional capability that does not affect AC performance and provides design flexibility for dual-use applications.

Q: Are there any thermal performance differences between these parts? A: The R46KI26800001K extends the maximum operating temperature from 100°C to 110°C. This provides an additional thermal margin and is compatible with higher ambient temperature environments. For 100°C or lower applications, both parts perform identically.

Q: What certifications ensure compatibility? A: Both parts maintain identical compliance profiles: ROHS3 compliant, REACH Unaffected, and X2 safety rated for AC mains filtering applications. These certifications confirm electrical and regulatory interchangeability.

Q: Will PCB rework be required to use the R46KI26800001K? A: No PCB rework is required. The substitute maintains identical lead spacing (15.00mm) and radial mounting configuration. The slightly smaller physical dimensions (5.00mm vs. 6.00mm width, 11.10mm vs. 12.50mm height) ensure fit within the original mounting footprint.

Q: Is the R46KI26800001K readily available? A: The R46KI26800001K is listed as Active product status with established manufacturing. The MPXQS68K is obsolete, making the KEMET equivalent the appropriate long-term supply source for new production and field repairs.