WMF4D1K-F Film Capacitor Equivalent & Substitute Parts

Part Overview

The WMF4D1K-F is a 1000 pF film capacitor manufactured by Cornell Dubilier Electronics (CDE) with a 400V 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 reliable capacitance stability across industrial temperature ranges.

Substitute parts are identified when equivalent capacitance and tolerance values are maintained while voltage ratings, dielectric materials, or physical dimensions may differ within acceptable engineering parameters. The WMF4D1K-F remains in active production with 959 units in current inventory.

Substiute Parts

WMF4D1K-F

Cornell Dubilier Electronics (CDE)In Stock: 1016WMF4D1K-F Datasheet

Current PartRFQ

102MWR630K

Cornell Dubilier / Illinois CapacitorIn Stock: 1560102MWR630K Datasheet

SimilarRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution logic for the WMF4D1K-F is based on the following criteria:

Mandatory Match Parameters:

• Capacitance: 1000 pF (exact match required)
• Tolerance: ±10% (exact match required)
• Mounting Type: Through Hole (exact match required)
• Package / Case: Axial (exact match required)

Allowable Variation Parameters:

• Voltage Rating - DC: Substitute must be ≥400V (higher voltage rating acceptable)
• Dielectric Material: Polyester or Polyester Metallized (both acceptable for general-purpose applications)
• Operating Temperature Range: Substitute must support the required operating window or exceed it
• Physical Dimensions: May vary within axial package constraints
• RoHS Compliance: Must maintain ROHS3 Compliant status

The identified substitute part 102MWR630K meets all mandatory match criteria and exceeds the voltage rating requirement, making it electrically compatible for applications where the original part is specified.

Parameter Comparison

Engineering Selection Recommendations

Primary Part: WMF4D1K-F

The WMF4D1K-F is recommended for applications requiring the specified -55°C to 125°C operating temperature range. This part maintains active product status with established supply availability (959 units in stock). ROHS3 compliance and REACH unaffected status confirm regulatory alignment for industrial and commercial applications.

Substitute Part: 102MWR630K

The 102MWR630K is electrically compatible as a substitute when the following conditions are met:

1. The application operating temperature range does not require operation below -40°C or above 105°C
2. The physical dimensions (0.217" Dia x 0.453" L) are compatible with PCB layout and mechanical constraints
3. The higher voltage rating (630V DC) does not create design conflicts
4. The metallized polyester dielectric is acceptable for the application

Both parts maintain ROHS3 compliance and unlimited moisture sensitivity rating (MSL 1), ensuring regulatory and environmental compatibility. The substitute part offers higher inventory availability (1501 units in stock) and lower ESR characteristics due to metallized construction.

Frequently Asked Questions (FAQ)

Q: Can 102MWR630K replace WMF4D1K-F in all applications?

A: Electrical substitution is valid for capacitance (1000 pF ±10%), voltage rating (630V exceeds 400V requirement), and mounting type (axial through-hole). However, physical dimensions differ: WMF4D1K-F is 0.189" Dia x 0.685" L versus 102MWR630K at 0.217" Dia x 0.453" L. PCB layout compatibility must be verified. Operating temperature range for 102MWR630K is -40°C to 105°C, which is narrower than the original -55°C to 125°C specification.

Q: What is the significance of the metallized polyester dielectric in 102MWR630K?

A: Metallized polyester construction in the substitute part provides lower equivalent series resistance (ESR) compared to standard polyester film. This characteristic is beneficial for high-frequency filtering and noise suppression applications. Both dielectric types are polyester-based and maintain equivalent capacitance and tolerance specifications.

Q: Are there any compliance differences between the two parts?

A: Both parts are ROHS3 compliant, REACH unaffected, and classified under ECCN EAR99 with identical HTSUS code 8532.25.0060. Moisture sensitivity level is 1 (unlimited) for both parts. No compliance barriers exist for substitution.

Q: What is the lead spacing consideration for these axial components?

A: Lead spacing is not specified in the provided data for either part. Physical dimensions must be verified against PCB design files. The substitute part's shorter length (0.453" versus 0.685") may affect lead spacing on existing PCB layouts.

Q: Can the substitute part be used in temperature-critical applications?

A: The 102MWR630K operating range (-40°C to 105°C) does not cover the full -55°C to 125°C specification of the WMF4D1K-F. Applications requiring operation at temperatures below -40°C or above 105°C must use the original WMF4D1K-F part.

Q: Is the higher voltage rating of 102MWR630K a concern?

A: Higher voltage rating (630V versus 400V) is not a design concern. Voltage derating improves reliability and extends component life. The substitute part operates safely in circuits designed for 400V DC operation.