WMF4P68K Film Capacitor - Equivalent & Substitute Parts

Part Overview

The WMF4P68K is a 0.68 µF film capacitor rated for 400V DC operation with polyester dielectric material and through-hole axial mounting. This part is currently listed as obsolete, which necessitates identification of functionally equivalent alternatives for continued design support and procurement. The WMF series from Cornell Dubilier Electronics provides direct substitutes that maintain electrical and mechanical compatibility while offering improved product availability and compliance status.

Substiute Parts

WMF4P68K

Cornell Dubilier Electronics (CDE)In Stock: 793WMF4P68K Datasheet

Current PartRFQ

WMF4P68K-F

Cornell Dubilier Electronics (CDE)In Stock: 1270WMF4P68K-F Datasheet

DirectRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitute parts for the WMF4P68K are identified based on strict equivalence of critical electrical and mechanical parameters. The substitute WMF4P68K-F maintains identical specifications across all functional dimensions:

Electrical Equivalence Parameters:

• Capacitance: 0.68 µF (exact match)
• Voltage Rating: 400V DC (exact match)
• Tolerance: ±10% (exact match)
• Dielectric Material: Polyester (exact match)
• Operating Temperature Range: -55°C to 125°C (exact match)

Mechanical Equivalence Parameters:

• Package / Case: Axial (exact match)
• Size / Dimension: 0.819" Dia × 1.748" L / 20.80mm × 44.40mm (exact match)
• Termination: PC Pins (exact match)
• Mounting Type: Through Hole (exact match)

The WMF4P68K-F is classified as a direct substitute due to 100% parameter alignment with the main part number.

Parameter Comparison

Engineering Selection Recommendations

The WMF4P68K-F is the direct functional equivalent to the obsolete WMF4P68K. Selection between these parts is determined by regulatory and compliance requirements rather than electrical or mechanical differences.

For New Designs and Redesigns: The WMF4P68K-F is the appropriate selection. This part carries Active product status, ensuring long-term availability and supply continuity. It meets RoHS3 compliance requirements, satisfying current regulatory standards for electronic components in many jurisdictions.

For Legacy System Support: The WMF4P68K remains electrically and mechanically compatible with existing designs. Adequate inventory (686 units) is available for maintenance and repair applications where design modification is not feasible.

Both parts meet REACH compliance and carry EAR99 classification, with identical HTSUS coding (8532.25.0060).

Frequently Asked Questions (FAQ)

Q: Are the WMF4P68K and WMF4P68K-F interchangeable in my circuit? A: Yes. Both parts share identical electrical specifications (0.68 µF, 400V, ±10% tolerance, polyester dielectric), operating temperature range (-55°C to 125°C), and mechanical form factor (axial package, identical dimensions, PC pin termination). Direct board-level substitution is supported without circuit modification.

Q: Why does the WMF4P68K-F have higher inventory availability? A: The WMF4P68K-F is classified as Active product status, indicating ongoing production and distribution support. The WMF4P68K is obsolete, reflecting discontinuation of active manufacturing and declining available stock.

Q: What is the difference between the RoHS status of these two parts? A: The WMF4P68K is RoHS non-compliant, while the WMF4P68K-F is RoHS3 compliant. RoHS3 compliance restricts hazardous substances in electrical equipment and is a regulatory requirement in many markets. New designs should specify the RoHS3-compliant part unless legacy compliance documentation is required.

Q: Are there any differences in packaging between these parts? A: Yes. The WMF4P68K is supplied in standard packaging, while the WMF4P68K-F uses bulk packaging. The components themselves are identical in form and function. Bulk packaging typically offers cost advantages for higher-volume procurement.

Q: Can I use the WMF4P68K-F as a substitute in existing assemblies? A: Yes. The WMF4P68K-F meets all electrical and mechanical requirements for direct substitution in applications originally designed with the WMF4P68K. No design modifications are necessary.