WMF4P1K Film Capacitor - Equivalent & Substitute Parts

Part Overview

The WMF4P1K is a 0.1 µF film capacitor rated for 400V DC with polyester dielectric material and axial through-hole mounting. This component is classified as obsolete, making identification of functionally equivalent alternatives essential for ongoing system support and procurement planning. The WMF4P1K-F provides a direct functional equivalent with improved product status and compliance characteristics.

Substiute Parts

WMF4P1K

Cornell Dubilier Electronics (CDE)In Stock: 894WMF4P1K Datasheet

Current PartRFQ

WMF4P1K-F

Cornell Dubilier Electronics (CDE)In Stock: 5191WMF4P1K-F Datasheet

DirectRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution of WMF4P1K with WMF4P1K-F is based on identical or equivalent values for the following critical parameters:

• Capacitance: Both parts specified at 0.1 µF
• Tolerance: Both specified at ±10%
• Voltage Rating (DC): Both rated for 400V DC
• Dielectric Material: Both use polyester dielectric
• Mounting Type: Both are through-hole mounted
• Package / Case: Both utilize axial package configuration
• Physical Dimensions: Identical at 0.488" Dia x 1.063" L (12.40mm x 27.00mm)
• Operating Temperature Range: Both rated -55°C ~ 125°C
• Termination: Both feature PC Pins
• Series: Both belong to the WMF series

These matching parameters ensure mechanical and electrical interchangeability at the board level and within circuit applications.

Parameter Comparison

Engineering Selection Recommendations

The WMF4P1K-F is the direct substitute for WMF4P1K applications. Selection criteria favor WMF4P1K-F based on the following factors:

Product Status: WMF4P1K-F maintains Active status, ensuring continued manufacturer support and long-term supply chain stability, whereas WMF4P1K is classified as Obsolete and subject to end-of-life constraints.

Regulatory Compliance: WMF4P1K-F is ROHS3 compliant, meeting modern regulatory requirements for restricted hazardous substances. WMF4P1K remains RoHS non-compliant and may face restrictions in new designs or markets with RoHS enforcement.

Supply Availability: WMF4P1K-F demonstrates significantly higher inventory levels (5156 Pcs) compared to WMF4P1K (884 Pcs), reducing procurement risk and lead time variability.

Electrical and Mechanical Equivalence: Identical electrical specifications and physical dimensions ensure direct circuit compatibility without board-level modifications or design recalification.

Frequently Asked Questions (FAQ)

Q: Can WMF4P1K-F replace WMF4P1K in existing circuit designs? A: Yes. WMF4P1K-F meets all critical substitution parameters: identical capacitance (0.1 µF), tolerance (±10%), voltage rating (400V DC), dielectric material (polyester), mounting type (through-hole axial), and physical dimensions (0.488" Dia x 1.063" L). No circuit modifications are required.

Q: What is the primary difference between these part numbers? A: WMF4P1K is an obsolete component, while WMF4P1K-F is the active-status equivalent. Additionally, WMF4P1K-F is ROHS3 compliant, whereas WMF4P1K is RoHS non-compliant.

Q: Are the physical dimensions identical for board-level substitution? A: Yes. Both parts feature identical axial package dimensions of 0.488" diameter by 1.063" length (12.40mm x 27.00mm), ensuring direct mechanical compatibility with existing through-hole footprints.

Q: Which part should be specified for new designs? A: WMF4P1K-F should be specified for new designs due to its Active product status, ROHS3 compliance, and superior supply availability.

Q: Are there any performance differences in voltage or temperature ratings? A: No. Both parts are rated for identical operating conditions: 400V DC voltage rating and -55°C ~ 125°C operating temperature range.