WMF05W1K Film Capacitor Equivalent & Substitute Parts

Part Overview

The WMF05W1K is a 1 µF polyester film capacitor rated for 50V DC operation in an axial through-hole package, manufactured by Cornell Dubilier Electronics (CDE). This component is classified as obsolete, indicating discontinued production. Locating equivalent and substitute parts is necessary to support ongoing maintenance, repair, and new design implementations where this capacitor specification remains functionally required.

Substiute Parts

WMF05W1K

Cornell Dubilier Electronics (CDE)In Stock: 1093WMF05W1K Datasheet

Current PartRFQ

WMF05W1K-F

Cornell Dubilier Electronics (CDE)In Stock: 848WMF05W1K-F Datasheet

DirectRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitute parts for the WMF05W1K are identified based on strict electrical and mechanical parameter matching:

Primary Substitution Criteria:

• Capacitance value: 1 µF (exact match required)
• Tolerance: ±10% (exact match required)
• Voltage rating: 50V DC minimum (equal or higher acceptable)
• Dielectric type: Polyester (exact match required)
• Operating temperature range: -55°C to 125°C (equal or wider range acceptable)
• Package type: Axial through-hole (exact match required)
• Physical dimensions: 0.563" Dia × 1.374" L (exact match required)

Substitutes are grouped into two categories: direct manufacturer equivalents and cross-manufacturer alternatives. All listed substitutes maintain identical electrical performance and mechanical compatibility with the original WMF05W1K specification.

Parameter Comparison

Engineering Selection Recommendations

WMF05W1K-F (Direct Equivalent - Recommended Primary Substitute)

The WMF05W1K-F is the direct successor to the obsolete WMF05W1K. Both components are manufactured by Cornell Dubilier Electronics and share identical electrical specifications and physical dimensions. The WMF05W1K-F maintains active production status and achieves ROHS3 compliance, addressing regulatory requirements for new designs and procurement. This part is the preferred substitute for direct replacement applications.

105MWR050K (Cross-Manufacturer Alternative)

The 105MWR050K provides electrical and mechanical equivalence to the WMF05W1K specification. This part matches all critical parameters: 1 µF capacitance, ±10% tolerance, 50V DC rating, polyester dielectric, -55°C to 125°C operating range, and identical axial through-hole package dimensions. This alternative is suitable for applications where multi-source component strategies are required or where supply chain diversification is necessary.

Selection Basis:

Component selection between WMF05W1K-F and 105MWR050K should be determined by:

• Supply chain availability and lead time requirements
• Regulatory compliance mandates (ROHS3 compliance status of WMF05W1K-F)
• Procurement specifications and approved vendor lists
• Cost considerations and inventory management strategies

All listed substitutes are electrically and mechanically interchangeable with the original WMF05W1K within the specified application class of general-purpose filtering and coupling circuits.

Frequently Asked Questions (FAQ)

Q: Can WMF05W1K-F be used as a direct replacement for WMF05W1K?

A: Yes. The WMF05W1K-F is a direct equivalent with identical capacitance (1 µF), tolerance (±10%), voltage rating (50V DC), dielectric material (polyester), operating temperature range (-55°C to 125°C), and physical dimensions (0.563" Dia × 1.374" L). Both components use axial through-hole mounting with PC pin termination. The primary difference is product status: WMF05W1K-F is in active production while WMF05W1K is obsolete.

Q: What does the ±10% tolerance specification mean for substitution?

A: The ±10% tolerance indicates that the actual capacitance value will fall within the range of 0.9 µF to 1.1 µF. All listed substitutes maintain this identical tolerance specification, ensuring equivalent performance in circuits designed for the WMF05W1K. Tolerance matching is a critical substitution criterion.

Q: Are the physical dimensions identical across all substitute parts?

A: Yes. All substitute parts listed maintain the same axial package dimensions of 0.563" diameter by 1.374" length (14.30mm × 34.90mm). This dimensional equivalence ensures mechanical compatibility with existing printed circuit board layouts and component mounting fixtures designed for the WMF05W1K.

Q: What is the significance of RoHS compliance status in component selection?

A: RoHS compliance status indicates adherence to the Restriction of Hazardous Substances directive. The WMF05W1K-F achieves ROHS3 compliance, while the original WMF05W1K is non-compliant. For new product designs or applications subject to regulatory requirements, ROHS3-compliant alternatives such as WMF05W1K-F are necessary. For legacy equipment repair using original specifications, non-compliant parts may remain acceptable depending on application jurisdiction.

Q: Can substitutes be used in circuits operating at temperatures outside the -55°C to 125°C range?

A: No. All listed substitutes are specified for operation within the -55°C to 125°C temperature range. Circuits requiring operation outside this range require components with different thermal specifications and cannot use these substitutes.

Q: How does the 50V DC voltage rating affect substitution decisions?

A: The 50V DC rating is the maximum voltage at which the capacitor can operate safely. Substitutes must maintain this rating or higher. All listed substitutes are rated for 50V DC minimum. Components rated below 50V DC are not acceptable substitutes. Components rated above 50V DC are acceptable but may have different physical dimensions or cost implications.

Q: What is the difference between "Voltage Rating - AC" and "Voltage Rating - DC"?

A: The WMF05W1K specification includes only a DC voltage rating (50V) with no AC rating specified. This indicates the component is rated for DC applications. Substitutes must maintain this DC specification. AC voltage ratings, when specified, indicate capability for alternating current applications and are not applicable to this component category.