MMP4P68K-F Equivalent & Substitute Parts

Part Overview

The MMP4P68K-F is a 0.68 µF film capacitor manufactured by Cornell Dubilier Electronics (CDE) in the MMP series. This axial-mounted through-hole component operates at 400V DC with polyester metallized dielectric construction. The part is Active in product status with 798 units currently in stock. Alternative equivalent parts may be required due to inventory constraints, design revisions, or supply chain considerations.

Substiute Parts

MMP4P68K-F

Cornell Dubilier Electronics (CDE)In Stock: 893MMP4P68K-F Datasheet

Current PartRFQ

684MWR400K

Cornell Dubilier / Illinois CapacitorIn Stock: 1227684MWR400K Datasheet

SimilarRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution of the MMP4P68K-F is determined by strict equivalence across the following critical parameters:

Electrical Parameters:

• Capacitance value: 0.68 µF (exact match required)
• Tolerance: ±10% (matching tolerance band)
• Voltage Rating - DC: 400V (minimum requirement)
• Voltage Rating - AC: 200V (minimum requirement)
• Dielectric Material: Polyester, Metallized (material type must match)

Mechanical Parameters:

• Mounting Type: Through Hole (circuit board integration method)
• Package / Case: Axial (physical form factor)
• Termination: PC Pins (lead configuration)

Compliance Parameters:

• RoHS3 Compliant status
• REACH Unaffected status

The substitute part 684MWR400K meets all critical electrical and mechanical parameters. Physical dimensions differ within acceptable tolerances for through-hole axial mounting. Operating temperature range differs but does not restrict substitution in applications within the overlapping range (-40°C ~ 105°C).

Parameter Comparison

Engineering Selection Recommendations

Primary Selection: MMP4P68K-F

The MMP4P68K-F is the specified component with Active product status and 798 units in current inventory. This part meets all application requirements with an extended operating temperature range of -55°C ~ 125°C.

Equivalent Substitute: 684MWR400K

The 684MWR400K is electrically and mechanically equivalent to the MMP4P68K-F. Both parts are manufactured within the Cornell Dubilier family, carry Active product status, and maintain ROHS3 and REACH compliance. The 684MWR400K features lower ESR (2.08 Ohms) and is available in higher inventory (1157 units).

Substitution Constraints:

The 684MWR400K operates within a narrower temperature range (-40°C ~ 105°C). Selection of this substitute is appropriate only for applications operating within this overlapping temperature window. Physical dimensions differ; however, both maintain axial through-hole form factors compatible with standard PCB mounting.

Frequently Asked Questions (FAQ)

Q: Can the 684MWR400K replace the MMP4P68K-F in all applications?

A: The 684MWR400K is electrically equivalent for applications operating between -40°C and 105°C. Applications requiring operation below -40°C or above 105°C must use the MMP4P68K-F.

Q: What are the physical dimension differences between these parts?

A: The MMP4P68K-F measures 16.00mm W × 9.00mm T × 35.00mm L. The 684MWR400K measures 12.50mm diameter × 34.00mm L. Both are axial through-hole components; verify PCB layout clearances before substitution.

Q: Are both parts RoHS and REACH compliant?

A: Yes. Both the MMP4P68K-F and 684MWR400K are ROHS3 Compliant and REACH Unaffected.

Q: What is the significance of the lower ESR in the 684MWR400K?

A: The 684MWR400K specifies 2.08 Ohms ESR. Lower ESR reduces heat generation and improves high-frequency performance. The MMP4P68K-F does not specify ESR; verify application requirements before selecting based on this parameter.

Q: Can these parts be used interchangeably on the same PCB?

A: Physical dimensions differ. Verify PCB footprint and mounting hole spacing accommodate the 684MWR400K (12.50mm diameter vs. 16.00mm width) before substitution. Lead spacing and termination type (PC Pins) are identical.

Q: What is the inventory status for each part?

A: MMP4P68K-F: 798 units in stock. 684MWR400K: 1157 units in stock. Both are Active products with immediate availability.