WMF2W1K-F Equivalent & Substitute Parts

Part Overview

The WMF2W1K-F is a 1 µF film capacitor rated for 250V DC operation, manufactured by Cornell Dubilier Electronics (CDE) in the WMF series. This axial-mounted through-hole component utilizes polyester dielectric material and is designed for general-purpose applications across an operating temperature range of -55°C to 125°C. The part maintains Active product status and is RoHS3 compliant. Substitute parts are identified when equivalent electrical performance and mechanical compatibility can be achieved within the specified parameter tolerances, enabling procurement flexibility and supply chain continuity.

Substiute Parts

WMF2W1K-F

Cornell Dubilier Electronics (CDE)In Stock: 709WMF2W1K-F Datasheet

Current PartRFQ

105MWR250K

Cornell Dubilier / Illinois CapacitorIn Stock: 1152105MWR250K Datasheet

SimilarRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitute parts for the WMF2W1K-F are identified based on strict equivalence across the following critical parameters:

Electrical Parameters (Must Match):

• Capacitance: 1 µF
• Tolerance: ±10%
• Voltage Rating - DC: 250V
• Dielectric Material: Polyester

Mechanical Parameters (Must Match):

• Mounting Type: Through Hole
• Package / Case: Axial
• Termination: PC Pins

Compliance Parameters (Must Match):

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

The substitute part 105MWR250K meets all critical electrical and mechanical requirements. While physical dimensions and operating temperature ranges differ from the main part, these variations do not preclude substitution when circuit board layout and thermal environment specifications permit. The substitute part utilizes metallized polyester dielectric, which is a recognized variant within the polyester film capacitor category and maintains equivalent functional performance at the specified voltage and capacitance ratings.

Parameter Comparison

Engineering Selection Recommendations

Primary Selection (WMF2W1K-F): The WMF2W1K-F remains the primary specification when the full operating temperature range of -55°C to 125°C is required. This part is Active in product status and maintains full RoHS3 and REACH compliance. Current inventory of 650 pieces supports immediate procurement.

Substitute Selection (105MWR250K): The 105MWR250K is suitable for applications where the operating temperature range of -40°C to 105°C is acceptable. This substitute provides equivalent electrical performance at the specified 250V DC and 1 µF capacitance rating. The metallized polyester dielectric construction is a recognized variant within polyester film capacitor technology. The smaller physical dimensions (10.50mm x 27.00mm versus 18.80mm x 44.40mm) enable use in space-constrained circuit board layouts. Both parts maintain Active product status and full regulatory compliance. Inventory availability of 1050 pieces supports supply chain flexibility.

Compatibility Considerations: Substitution is permissible when circuit board layout accommodates the smaller axial package dimensions of the 105MWR250K and when the operating temperature environment remains within the -40°C to 105°C specification. Both parts utilize identical PC pin termination and axial through-hole mounting, ensuring mechanical compatibility with standard component placement equipment and PCB footprints designed for axial film capacitors.

Frequently Asked Questions (FAQ)

Q: Can the 105MWR250K be used as a direct replacement for the WMF2W1K-F?

A: The 105MWR250K provides electrical equivalence at the specified 1 µF capacitance and 250V DC rating. Substitution is valid when the application operating temperature remains within -40°C to 105°C. The smaller physical dimensions require verification that circuit board layout and component spacing accommodate the 10.50mm x 27.00mm package. Both parts use identical PC pin termination and axial mounting, ensuring mechanical compatibility.

Q: What is the difference between polyester and metallized polyester dielectric?

A: Both are polyester film dielectric materials. The 105MWR250K utilizes metallized polyester, where a thin metal layer is deposited on the film surface. This construction maintains equivalent capacitance and voltage rating performance while reducing physical package size. Both variants meet the specified electrical parameters for this application.

Q: Are there temperature limitations when using the 105MWR250K?

A: The 105MWR250K operates within -40°C to 105°C, compared to the WMF2W1K-F range of -55°C to 125°C. Applications requiring operation below -40°C or above 105°C must use the primary WMF2W1K-F specification. Applications within the -40°C to 105°C range can use either part.

Q: Do both parts meet regulatory compliance requirements?

A: Both the WMF2W1K-F and 105MWR250K are RoHS3 compliant and REACH unaffected. Both parts maintain Active product status. Regulatory compliance is equivalent between the two options.

Q: What is the physical size difference between these parts?

A: The WMF2W1K-F measures 0.740" diameter by 1.748" length (18.80mm x 44.40mm). The 105MWR250K measures 0.413" diameter by 1.063" length (10.50mm x 27.00mm). The substitute part is significantly smaller, enabling use in compact circuit board designs where space is limited.

Q: Can the 105MWR250K be used in high-temperature applications?

A: The 105MWR250K maximum operating temperature is 105°C. Applications requiring sustained operation above 105°C must use the WMF2W1K-F, which is rated to 125°C.