DMM4P68K-F Equivalent & Substitute Parts

Part Overview

The DMM4P68K-F is a 0.68 µF film capacitor manufactured by Cornell Dubilier Electronics (CDE) with a 400V DC voltage rating and ±10% tolerance. This radial through-hole component utilizes polyester metallized dielectric technology and operates across the temperature range of -55°C to 125°C. The part is currently in active production status with ROHS3 compliance and REACH unaffected classification. Substitute parts are identified when equivalent electrical specifications and mechanical compatibility parameters are maintained across the component family.

Substiute Parts

DMM4P68K-F

Cornell Dubilier Electronics (CDE)In Stock: 735DMM4P68K-F Datasheet

Current PartRFQ

DME4P68K-F

Cornell Dubilier Electronics (CDE)In Stock: 875DME4P68K-F Datasheet

SimilarRFQ

684MSR400K

Cornell Dubilier / Illinois CapacitorIn Stock: 1061684MSR400K Datasheet

SimilarRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitute parts for the DMM4P68K-F are qualified based on strict electrical and mechanical parameter matching. The following criteria determine substitution eligibility:

Electrical Parameters (Must Match Exactly):

• Capacitance: 0.68 µF
• Tolerance: ±10%
• Voltage Rating - DC: 400V
• Voltage Rating - AC: 200V
• Dielectric Material: Polyester, Metallized
• Operating Temperature Range: -55°C to 125°C

Mechanical Parameters (Must Match):

• Mounting Type: Through Hole
• Package Type: Radial
• Termination: PC Pins

Compliance Parameters (Must Match):

• RoHS Status: ROHS3 Compliant
• REACH Status: REACH Unaffected

All identified substitute parts meet these criteria. Physical dimensions and lead spacing may vary within the radial through-hole package category while maintaining functional equivalence.

Parameter Comparison

Engineering Selection Recommendations

All three parts—DMM4P68K-F, DME4P68K-F, and 684MSR400K—are functionally equivalent 0.68 µF film capacitors with identical electrical specifications and active product status. Selection between these parts is determined by physical space constraints and lead spacing requirements in the target application.

DMM4P68K-F is the primary reference part with standard radial dimensions (31.00 mm × 10.50 mm) and 27.50 mm lead spacing. This configuration is suitable for applications with standard PCB hole spacing.

DME4P68K-F offers a compact form factor (26.00 mm × 7.50 mm) with reduced lead spacing of 22.50 mm. This variant is appropriate for space-constrained designs or PCBs with tighter component pitch requirements.

684MSR400K provides a slightly larger envelope (32.00 mm × 12.00 mm) with 27.50 mm lead spacing matching the primary part. This option is available from the Illinois Capacitor product line within the Cornell Dubilier family.

All parts maintain ROHS3 compliance and REACH unaffected status. Selection should be based on PCB layout requirements and available inventory.

Frequently Asked Questions (FAQ)

Q: Can DME4P68K-F replace DMM4P68K-F in any application?

A: DME4P68K-F is electrically equivalent with identical capacitance, voltage rating, tolerance, and temperature range. However, the reduced physical dimensions (26.00 mm vs. 31.00 mm length) and different lead spacing (22.50 mm vs. 27.50 mm) require verification of PCB hole pattern compatibility before substitution.

Q: What is the difference between DMM4P68K-F and 684MSR400K?

A: Both parts share identical electrical specifications and 27.50 mm lead spacing. The 684MSR400K has slightly larger physical dimensions (32.00 mm × 12.00 mm vs. 31.00 mm × 10.50 mm) and marginally greater seated height (19.00 mm vs. 18.00 mm). These differences are within typical radial capacitor package tolerances and do not affect electrical performance.

Q: Are all three parts ROHS3 compliant?

A: Yes. DMM4P68K-F, DME4P68K-F, and 684MSR400K are all ROHS3 compliant and REACH unaffected, meeting current environmental and regulatory requirements.

Q: What determines whether a substitute part is acceptable?

A: Substitution is valid when the following parameters match exactly: capacitance (0.68 µF), tolerance (±10%), DC voltage rating (400V), AC voltage rating (200V), dielectric material (polyester metallized), operating temperature range (-55°C to 125°C), mounting type (through hole), package type (radial), and termination (PC pins). Physical dimensions and lead spacing must be compatible with the target PCB layout.

Q: Can these parts be used interchangeably in high-frequency applications?

A: All three parts are specified for general purpose applications with polyester metallized dielectric. Frequency-dependent performance characteristics are not provided in the technical parameters. Application-specific frequency requirements must be evaluated against manufacturer datasheets.

Q: What is the moisture sensitivity level for these capacitors?

A: DMM4P68K-F and 684MSR400K have MSL 1 (Unlimited), indicating no moisture sensitivity restrictions. DME4P68K-F is listed as Not Applicable for MSL, indicating no moisture sensitivity concern for this variant.