WMF4S68K Film Capacitor Equivalent & Substitute Parts

Part Overview

The WMF4S68K is a 0.068 µF polyester film capacitor rated for 400V DC operation in an axial through-hole package, manufactured by Cornell Dubilier Electronics (CDE). This component is classified as obsolete, which necessitates identification of active equivalent parts for ongoing procurement and design continuity. The WMF series represents a legacy product line; however, direct functional equivalents remain available from the same manufacturer with improved compliance status.

Substiute Parts

WMF4S68K

Cornell Dubilier Electronics (CDE)In Stock: 822WMF4S68K Datasheet

Current PartRFQ

WMF4S68K-F

Cornell Dubilier Electronics (CDE)In Stock: 1066WMF4S68K-F Datasheet

DirectRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution eligibility for the WMF4S68K is determined by strict equivalence across the following parameters:

Critical Parameters (Must Match Exactly):

• Capacitance: 0.068 µF
• Voltage Rating (DC): 400V
• Dielectric Material: Polyester
• Mounting Type: Through Hole Axial
• Package / Case: Axial
• Termination: PC Pins

Allowable Variations:

• Tolerance: Equal or tighter than ±10%
• Operating Temperature Range: Must encompass or exceed -55°C to 125°C
• Product Status: Active parts are preferred over obsolete parts for new procurement
• Compliance Status: RoHS and REACH compliance represents an improvement over the original part

The WMF4S68K-F meets all substitution criteria as a direct equivalent with identical electrical and mechanical specifications. The primary distinction is product status and regulatory compliance.

Parameter Comparison

Engineering Selection Recommendations

The WMF4S68K-F is a direct functional and physical equivalent to the WMF4S68K. Selection of the WMF4S68K-F is supported by the following engineering factors:

Product Status: The WMF4S68K-F carries active product status, ensuring continued availability and manufacturer support. The original WMF4S68K is obsolete, presenting long-term procurement risk.

Regulatory Compliance: The WMF4S68K-F is RoHS3 compliant, whereas the original part is non-compliant. This distinction is significant for applications subject to RoHS directives in the European Union and equivalent regulatory frameworks. Both parts maintain REACH Unaffected status.

Electrical and Mechanical Equivalence: All critical parameters—capacitance, voltage rating, dielectric material, temperature range, mounting configuration, and physical dimensions—are identical between the two parts. No circuit redesign or PCB layout modification is required.

Inventory Availability: The WMF4S68K-F is available in higher quantity (962 pcs) compared to the original part (735 pcs), supporting production continuity.

For new designs and ongoing procurement, the WMF4S68K-F is the appropriate selection. For legacy systems currently using the WMF4S68K, direct substitution is electrically and mechanically valid.

Frequently Asked Questions (FAQ)

Q: Can the WMF4S68K-F be used as a direct replacement for the WMF4S68K in existing assemblies?

A: Yes. The WMF4S68K-F is a direct substitute. All electrical parameters (capacitance, voltage rating, tolerance, temperature range) and mechanical parameters (package type, dimensions, termination) are identical. No circuit modification or PCB rework is required.

Q: What is the significance of the RoHS3 compliance difference?

A: RoHS3 compliance indicates the WMF4S68K-F meets current European Union Restriction of Hazardous Substances directives. The original WMF4S68K is non-compliant. For applications subject to RoHS requirements or for supply chains requiring compliant components, the WMF4S68K-F is the appropriate choice.

Q: Are there any differences in electrical performance between these two parts?

A: No. Both parts are 0.068 µF polyester film capacitors rated for 400V DC with ±10% tolerance and -55°C to 125°C operating temperature range. Electrical performance is identical.

Q: Why is the WMF4S68K classified as obsolete?

A: The WMF4S68K has been superseded by the WMF4S68K-F, which offers improved compliance status and active product support. Obsolete classification indicates the manufacturer no longer actively produces or supports this specific part number.

Q: Can the WMF4S68K-F be used in new product designs?

A: Yes. The WMF4S68K-F is the recommended part for new designs. It provides the same electrical and mechanical functionality as the original part with the advantage of active product status and regulatory compliance.

Q: Are the physical dimensions identical?

A: Yes. Both parts measure 0.406" diameter × 1.063" length (10.30mm × 27.00mm). PCB footprints and mounting hole spacing are identical, requiring no layout modifications.

Q: What is the lead spacing for these axial components?

A: Lead spacing information is not specified in the manufacturer data for these parts. Physical measurement of the component or consultation of detailed mechanical drawings is required if precise lead spacing is critical for PCB design.