WMF4S22K-F Film Capacitor Equivalent & Substitute Parts

Part Overview

The WMF4S22K-F is a 0.022 µF 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 with ROHS3 compliance and unlimited moisture sensitivity rating (MSL 1). The part is designed for general-purpose applications requiring stable capacitance and reliable performance across industrial temperature ranges. Substitute parts are identified when equivalent electrical specifications and mechanical compatibility are maintained within the allowed parameter tolerances for this capacitor category.

Substiute Parts

WMF4S22K-F

Cornell Dubilier Electronics (CDE)In Stock: 746WMF4S22K-F Datasheet

Current PartRFQ

223MWR400K

Cornell Dubilier / Illinois CapacitorIn Stock: 1427223MWR400K Datasheet

SimilarRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitute parts for the WMF4S22K-F are identified based on strict electrical and mechanical parameter matching. The substitution logic requires:

Electrical Compatibility:

• Capacitance value must be 0.022 µF (no tolerance deviation permitted)
• DC voltage rating must be 400V minimum
• Tolerance specification must be ±10% or tighter
• Dielectric material must be polyester or polyester-based formulations

Mechanical Compatibility:

• Mounting configuration must be through-hole axial
• Termination must be PC pins for PCB insertion
• Package case must be axial form factor
• Physical dimensions must permit board-level installation

Compliance & Operational:

• RoHS3 compliance status must be maintained
• Operating temperature range of substitute must encompass or exceed -55°C to 125°C, or be acceptable for the specific application thermal envelope
• MSL rating of 1 (Unlimited) is maintained across all qualified substitutes

The 223MWR400K meets these criteria as a qualified substitute part.

Parameter Comparison

Engineering Selection Recommendations

Primary Part (WMF4S22K-F): Use the WMF4S22K-F when the full operating temperature range of -55°C to 125°C is required. This part maintains Active product status with established supply availability (694 pcs in stock). ROHS3 compliance and unlimited MSL rating support deployment in standard industrial and commercial environments.

Substitute Part (223MWR400K): The 223MWR400K is electrically and mechanically compatible for applications operating within the -40°C to 105°C temperature envelope. This substitute offers lower physical dimensions (5.50mm x 14.00mm versus 8.90mm x 20.60mm), which may provide PCB layout advantages in space-constrained designs. The metallized polyester dielectric formulation and documented low ESR (64.305 Ohms) are additional characteristics of this substitute. ROHS3 compliance is maintained. Higher inventory availability (1350 pcs) may support procurement timelines. Verify that the narrower operating temperature range and smaller physical footprint are acceptable for the target application before selection.

Compliance Verification: Both parts maintain ROHS3 compliance, REACH Unaffected status, and EAR99 export classification. Both are classified under HTSUS code 8532.25.0060.

Frequently Asked Questions (FAQ)

Q: Can the 223MWR400K be used as a direct replacement for the WMF4S22K-F in all applications?

A: The 223MWR400K is electrically compatible (matching capacitance, tolerance, and DC voltage rating). However, the operating temperature range is narrower (-40°C to 105°C versus -55°C to 125°C). Substitution is valid only for applications that operate within the -40°C to 105°C range. Additionally, the substitute part is physically smaller; verify PCB layout and mounting clearance before installation.

Q: What are the key electrical parameters that must match for substitution?

A: Capacitance (0.022 µF), DC voltage rating (400V minimum), tolerance (±10%), and dielectric material (polyester-based) must match or be compatible. Both parts meet these criteria.

Q: Does the smaller physical size of the 223MWR400K affect electrical performance?

A: Physical size does not affect the core electrical specifications (capacitance, voltage rating, tolerance). The smaller dimensions are a result of different manufacturing design. The documented ESR value (64.305 Ohms) for the 223MWR400K is provided as a reference characteristic.

Q: Are both parts RoHS compliant?

A: Yes. Both the WMF4S22K-F and 223MWR400K are ROHS3 Compliant with MSL rating of 1 (Unlimited).

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

A: The WMF4S22K-F uses polyester dielectric, while the 223MWR400K uses metallized polyester. Both are polyester-based and maintain the same electrical specifications for this application. Metallized polyester is a standard formulation in capacitor manufacturing and does not affect substitution compatibility for this part category.

Q: If my application requires the full -55°C to 125°C temperature range, which part should I use?

A: Use the WMF4S22K-F. The 223MWR400K operating range (-40°C to 105°C) does not cover the full specification. Substitution is not appropriate for applications requiring extended low-temperature or high-temperature operation beyond the substitute's rated range.

Q: Can I use the 223MWR400K in a design originally specified for the WMF4S22K-F if I verify the PCB layout?

A: Yes, provided that: (1) the application operates within -40°C to 105°C, (2) PCB layout and mounting clearance accommodate the smaller physical dimensions (5.50mm x 14.00mm), and (3) no other design constraints conflict with the substitute part's specifications.