WMF2S1K-F Equivalent & Substitute Parts

Part Overview

The WMF2S1K-F is a 10000 pF film capacitor manufactured by Cornell Dubilier Electronics (CDE) with a 250V DC voltage rating and polyester dielectric. This axial through-hole component is classified as Active product status and is suitable for general-purpose applications requiring stable capacitance performance across industrial temperature ranges.

Substitute parts are identified when equivalent capacitance values, tolerance specifications, and mounting configurations are available from the same or compatible manufacturers, with consideration for voltage rating derating and dielectric material compatibility in the target application circuit.

Substiute Parts

WMF2S1K-F

Cornell Dubilier Electronics (CDE)In Stock: 974WMF2S1K-F Datasheet

Current PartRFQ

103MWR400K

Cornell Dubilier / Illinois CapacitorIn Stock: 6204103MWR400K Datasheet

SimilarRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution eligibility for the WMF2S1K-F is determined by the following criteria:

Primary Matching Parameters:

• Capacitance value: 10000 pF (exact match required)
• Tolerance: ±10% (exact match required)
• Mounting type: Through Hole (exact match required)
• Package configuration: Axial (exact match required)
• Termination style: PC Pins (exact match required)

Secondary Compatibility Parameters:

• Voltage rating: Equal to or greater than 250V DC
• Dielectric material: Polyester or metallized polyester
• Operating temperature range: Must encompass or exceed -55°C ~ 125°C
• RoHS compliance: ROHS3 Compliant (required for regulatory alignment)

The substitute part 103MWR400K meets all primary matching parameters and exceeds the voltage rating specification at 400V DC, providing additional design margin. The metallized polyester dielectric and lower operating temperature floor (-40°C versus -55°C) represent the only deviations from the main part specification.

Parameter Comparison

Engineering Selection Recommendations

WMF2S1K-F Selection Criteria:

• Applications requiring the full -55°C to 125°C operating temperature range
• Circuits designed specifically for 250V DC voltage rating without derating margin
• PCB layouts with space allocation for the larger axial package (5.80mm diameter × 14.30mm length)
• Designs requiring standard polyester dielectric without metallization

103MWR400K Selection Criteria:

• Applications where 400V DC voltage rating provides beneficial design margin above the 250V requirement
• Circuits operating within the -40°C to 105°C temperature window
• PCB layouts with space constraints favoring the smaller axial package (5.00mm diameter × 11.50mm length)
• Designs where lower ESR (141.471 Ohms) provides performance advantage
• Applications requiring AC voltage rating specification (200V AC available)

Both parts maintain Active product status and ROHS3 compliance, ensuring continued availability and regulatory alignment. The 103MWR400K represents a direct functional substitute with enhanced voltage rating and reduced physical footprint, subject to verification that the reduced upper temperature limit (105°C versus 125°C) does not conflict with application requirements.

Frequently Asked Questions (FAQ)

Q: Can 103MWR400K replace WMF2S1K-F in all applications?

A: The 103MWR400K is functionally equivalent for capacitance, tolerance, and mounting configuration. Substitution is valid when the application operating temperature does not exceed 105°C. The reduced upper temperature limit (-40°C to 105°C versus -55°C to 125°C) must be evaluated against circuit thermal requirements.

Q: What is the significance of the voltage rating difference (250V versus 400V)?

A: The 103MWR400K operates at 400V DC, providing 160V additional voltage margin above the WMF2S1K-F specification of 250V DC. This higher rating does not affect capacitance or tolerance performance and may reduce stress in circuits operating near the 250V threshold.

Q: How does the smaller physical size of 103MWR400K affect PCB layout?

A: The 103MWR400K measures 5.00mm diameter × 11.50mm length compared to the WMF2S1K-F at 5.80mm diameter × 14.30mm length. The substitute part is approximately 19% shorter and 14% smaller in diameter, enabling more compact board layouts. Both maintain identical axial through-hole termination and PC pin configuration.

Q: What does "metallized polyester" mean for the 103MWR400K?

A: Metallized polyester dielectric incorporates a thin metal layer on the polyester film, reducing ESR to 141.471 Ohms. This construction maintains polyester dielectric properties while improving high-frequency performance characteristics compared to standard polyester film.

Q: Are both parts RoHS compliant?

A: Yes. Both WMF2S1K-F and 103MWR400K are ROHS3 Compliant, meeting regulatory requirements for hazardous substance restrictions in electronic components.

Q: What is the inventory status for these parts?

A: WMF2S1K-F: 869 Pcs New Original In Stock. 103MWR400K: 6097 Pcs New Original In Stock. The substitute part maintains significantly higher inventory availability.