WMF6W1K-F Film Capacitor Equivalent & Substitute Parts

Part Overview

The WMF6W1K-F is a 1 µF film capacitor manufactured by Cornell Dubilier Electronics (CDE) with a 630V DC voltage rating, polyester dielectric, and axial through-hole mounting. This component is classified as Active product status with 928 units in current inventory. Film capacitors of this specification are used in general-purpose applications requiring stable capacitance and low dissipation across extended temperature ranges. Substitute parts are identified when equivalent electrical parameters and mechanical compatibility are maintained within the allowed tolerance and voltage specifications.

Substiute Parts

WMF6W1K-F

Cornell Dubilier Electronics (CDE)In Stock: 960WMF6W1K-F Datasheet

Current PartRFQ

105MWR630K

Cornell Dubilier / Illinois CapacitorIn Stock: 1032105MWR630K Datasheet

SimilarRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution logic for the WMF6W1K-F is based on the following criteria:

Electrical Parameters (Non-Negotiable):

• Capacitance value: 1 µF (exact match required)
• Tolerance: ±10% (substitute tolerance must not exceed this range)
• Voltage Rating - DC: 630V minimum (equal or higher acceptable)
• Dielectric: Polyester (material class must match)

Mechanical Parameters (Required for Compatibility):

• Mounting: Through Hole Axial (must match for PCB layout)
• Termination: PC Pins (must match for soldering compatibility)
• Package Case: Axial (form factor must match)

Environmental & Compliance Parameters:

• Operating Temperature: Substitute range must encompass or exceed -55°C ~ 125°C
• RoHS Status: ROHS3 Compliant (regulatory requirement)
• REACH Status: REACH Unaffected (regulatory requirement)

The identified substitute part 105MWR630K meets all mandatory electrical and mechanical criteria while maintaining full regulatory compliance.

Parameter Comparison

Engineering Selection Recommendations

Primary Selection (WMF6W1K-F): Use the WMF6W1K-F when the full operating temperature range of -55°C ~ 125°C is required. This part maintains Active product status with 928 units in inventory and meets all ROHS3 and REACH compliance requirements. The larger physical dimensions (30.10mm diameter × 65.10mm length) may be necessary for specific PCB layout constraints or thermal management considerations.

Substitute Selection (105MWR630K): The 105MWR630K is electrically and mechanically compatible for applications where the operating temperature range can be limited to -40°C ~ 105°C. This substitute is manufactured by Cornell Dubilier / Illinois Capacitor with 994 units in inventory. The metallized polyester dielectric provides lower ESR (1.415 Ohms) compared to standard polyester film. The smaller physical footprint (22.00mm diameter × 34.00mm length) offers space savings on PCB layouts. Both parts maintain identical ROHS3 and REACH compliance status.

Critical Considerations:

• Temperature range limitation: The substitute part does not extend to the -55°C lower temperature limit of the main part. Verify application temperature requirements before substitution.
• Physical dimensions: The substitute is significantly smaller. Confirm PCB layout accommodates the reduced footprint and that lead spacing remains compatible with existing hole patterns.
• Both parts are Active status with current inventory availability.

Frequently Asked Questions (FAQ)

Q: Can the 105MWR630K be used as a direct replacement for the WMF6W1K-F in all applications?

A: The 105MWR630K is electrically compatible (1 µF, ±10%, 630V DC, polyester dielectric) and mechanically compatible (through-hole axial, PC pins). However, the operating temperature range differs: the substitute covers -40°C ~ 105°C while the main part covers -55°C ~ 125°C. Substitution is valid only if your application operates within the narrower temperature range. Additionally, the substitute is physically smaller (22.00mm × 34.00mm versus 30.10mm × 65.10mm), so PCB layout clearance must be verified.

Q: What does "metallized" polyester mean in the substitute part specification?

A: The 105MWR630K uses metallized polyester film, which has a thin metal coating applied to the dielectric. This construction results in lower ESR (1.415 Ohms) and is a standard variant within polyester film capacitor technology. Metallized polyester maintains the same electrical class and performance characteristics as standard polyester film for general-purpose applications.

Q: Are both parts RoHS and REACH compliant?

A: Yes. Both the WMF6W1K-F and 105MWR630K are ROHS3 Compliant and REACH Unaffected, meeting current regulatory requirements for electronic component manufacturing and use.

Q: What is the significance of the different physical dimensions?

A: The WMF6W1K-F measures 30.10mm diameter × 65.10mm length, while the 105MWR630K measures 22.00mm diameter × 34.00mm length. The substitute is substantially smaller. This difference affects PCB layout: the smaller part requires less board space but must fit within existing hole patterns and clearance zones. Verify that the reduced footprint does not create assembly or thermal management issues in your specific application.

Q: Why does the substitute have an AC voltage rating when the main part does not?

A: The 105MWR630K specification includes an AC voltage rating of 220V, which is additional information not provided for the WMF6W1K-F. This does not affect DC substitution compatibility. The DC voltage rating of 630V is the controlling parameter for both parts in DC applications.

Q: Are there inventory differences between these parts?

A: Yes. The WMF6W1K-F has 928 units in stock, while the 105MWR630K has 994 units in stock. Both are currently available as New Original components.