WMF6P68K-F: Equivalent & Substitute Parts

Part Overview

The WMF6P68K-F is a 0.68 µF film capacitor rated for 630V DC operation with polyester dielectric material and axial through-hole mounting. Manufactured by Cornell Dubilier Electronics (CDE), this component is classified as Active and suitable for general-purpose applications. Alternative components may be required due to inventory constraints, application-specific performance characteristics, or design optimization requirements.

Substiute Parts

WMF6P68K-F

Cornell Dubilier Electronics (CDE)In Stock: 899WMF6P68K-F Datasheet

Current PartRFQ

684MPW630K

Cornell Dubilier / Illinois CapacitorIn Stock: 1254684MPW630K Datasheet

SimilarRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution of the WMF6P68K-F is evaluated using the following critical parameters:

Mandatory Equivalence Criteria:

• Capacitance: 0.68 µF (exact match required)
• Tolerance: ±10% (minimum required accuracy)
• DC Voltage Rating: 630V (minimum threshold)
• Mounting Type: Through Hole (physical installation requirement)
• Package / Case: Axial (board layout compatibility)
• Termination: PC Pins (connection method)

Allowable Variation Parameters:

• Dielectric Material: Polyester or Polypropylene (both acceptable for film capacitor category)
• Operating Temperature Range: Polyester -55°C ~ 125°C; Polypropylene -55°C ~ 105°C (substitute provides narrower range but covers most industrial applications)
• Physical Dimensions: Variations acceptable within axial package constraints
• RoHS / REACH Compliance: Both main and substitute parts comply with regulatory requirements

The substitute part 684MPW630K meets all mandatory equivalence criteria while differing in dielectric material composition and thermal specifications.

Parameter Comparison

Engineering Selection Recommendations

Both WMF6P68K-F and 684MPW630K are Active products compliant with ROHS3 and unaffected by REACH restrictions. Selection between these components should be based on application requirements and thermal environment constraints.

The main part (WMF6P68K-F) provides a polyester dielectric with extended temperature rating to 125°C, making it suitable for high-temperature applications requiring maximum thermal headroom.

The substitute part (684MPW630K) utilizes metallized polypropylene dielectric with lower equivalent series resistance (260 mOhms), advantageous for DC Link and DC Filtering applications requiring minimal impedance. The thermal rating of 105°C is sufficient for standard industrial and consumer electronics operating environments.

Both components maintain identical capacitance, tolerance, and DC voltage specifications, ensuring functional equivalence within their respective thermal operating ranges.

Frequently Asked Questions (FAQ)

Q: Can 684MPW630K be used as a direct replacement for WMF6P68K-F? A: Yes, provided the application operating temperature does not exceed 105°C. Both components share identical capacitance (0.68 µF), tolerance (±10%), DC voltage rating (630V), axial through-hole package, and PC pin termination. The substitute offers compact dimensions (22.00mm x 34.00mm versus 26.20mm x 50.80mm), which may require PCB layout adjustment.

Q: What is the significance of dielectric material differences between polyester and polypropylene? A: Polyester offers higher temperature stability and extended operating range (-55°C to 125°C), while polypropylene metallized construction provides lower ESR (260 mOhms) beneficial for high-frequency ripple current applications. Both materials are acceptable film capacitor categories for DC storage and filtering circuits.

Q: Are there physical installation considerations when substituting WMF6P68K-F with 684MPW630K? A: Yes. The substitute part is considerably smaller (22.00mm x 34.00mm) compared to the original (26.20mm x 50.80mm). PCB through-hole spacing and component placement may require verification to ensure clearance and mechanical stability. Both maintain axial lead configuration suitable for through-hole soldering.

Q: Do both components meet regulatory compliance for industrial applications? A: Yes. Both WMF6P68K-F and 684MPW630K carry ROHS3 Compliance certification and REACH Unaffected status, meeting current electronic component regulatory requirements for industrial, commercial, and consumer applications.

Q: What application categories benefit from the 684MPW630K polypropylene construction? A: The metallized polypropylene dielectric and low ESR specification make 684MPW630K particularly suitable for DC Link filtering and DC Power supply filtering where minimal voltage ripple and thermal stability at operating temperatures up to 105°C are required.