WMF1S5K-F Film Capacitor Equivalent & Substitute Parts

Part Overview

The WMF1S5K-F is a 0.05 µF film capacitor manufactured by Cornell Dubilier Electronics (CDE) with a 100V DC voltage rating, polyester dielectric, and axial through-hole mounting. This component is classified as Active product status with full ROHS3 compliance and unlimited moisture sensitivity rating (MSL 1). Film capacitors in this specification range are used in general-purpose applications requiring stable capacitance and low dissipation factors. Substitute parts may be required due to inventory constraints, lead time considerations, or application-specific voltage and temperature requirements.

Substiute Parts

WMF1S5K-F

Cornell Dubilier Electronics (CDE)In Stock: 1297WMF1S5K-F Datasheet

Current PartRFQ

473MWR250K

Cornell Dubilier / Illinois CapacitorIn Stock: 5707473MWR250K Datasheet

SimilarRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitute parts for the WMF1S5K-F are identified based on the following substitution criteria:

Electrical Compatibility Parameters:

• Capacitance value within ±10% tolerance band (0.045 µF to 0.055 µF acceptable)
• Voltage rating equal to or greater than 100V DC
• Dielectric material: polyester or metallized polyester film
• Tolerance specification: ±10% or tighter

Mechanical Compatibility Parameters:

• Mounting type: Through-hole axial configuration
• Termination: PC pins for PCB insertion
• Package case: Axial form factor

Regulatory & Environmental Parameters:

• RoHS3 compliance required
• MSL rating 1 (unlimited moisture sensitivity)
• Operating temperature range must encompass -55°C to 125°C or broader

The substitute part 473MWR250K meets these criteria with the following considerations: capacitance value of 0.047 µF falls within the acceptable tolerance band; voltage rating of 250V DC exceeds the minimum 100V requirement; polyester metallized dielectric is compatible with polyester film applications; axial through-hole mounting and PC pin termination are identical; RoHS3 compliance is maintained.

Parameter Comparison

Engineering Selection Recommendations

Primary Selection Criteria:

The 473MWR250K substitute part is electrically and mechanically compatible with the WMF1S5K-F based on provided specifications. Both components maintain ROHS3 compliance and MSL 1 rating, satisfying regulatory requirements for equivalent applications.

Voltage Derating Consideration:

The substitute part features a 250V DC rating compared to the main part's 100V DC rating. This higher voltage specification provides additional safety margin in applications operating at or below 100V DC. No derating adjustment is required for direct substitution in circuits designed for the WMF1S5K-F.

Temperature Range Limitation:

The substitute part 473MWR250K specifies an operating temperature range of -40°C to 105°C, which is narrower than the main part's -55°C to 125°C range. Applications requiring operation below -40°C or above 105°C must retain the WMF1S5K-F. For general-purpose applications within the -40°C to 105°C envelope, the substitute is suitable.

Capacitance Tolerance:

The 0.047 µF capacitance of the substitute part represents a 6% reduction from the 0.05 µF specification. This variance remains within the ±10% tolerance band and is acceptable for general-purpose filtering and coupling applications where precise capacitance matching is not critical.

Inventory & Availability:

The substitute part 473MWR250K is available in higher inventory quantity (5644 pcs) compared to the main part (1200 pcs), making it suitable for high-volume procurement scenarios.

Frequently Asked Questions (FAQ)

Q: Can the 473MWR250K be used as a direct replacement for the WMF1S5K-F in all applications?

A: The 473MWR250K is compatible for applications operating within the -40°C to 105°C temperature range. Applications requiring operation below -40°C or above 105°C must use the WMF1S5K-F. Both parts are electrically compatible within their specified operating ranges.

Q: What is the significance of the capacitance difference between 0.05 µF and 0.047 µF?

A: The 0.047 µF value represents a 6% reduction from the 0.05 µF specification. This difference falls within the ±10% tolerance band declared for both parts and is acceptable for general-purpose applications. Applications requiring precise capacitance matching should verify circuit performance with the substitute value.

Q: Why does the substitute part have a higher voltage rating (250V vs. 100V)?

A: Higher voltage ratings provide additional safety margin and typically indicate enhanced dielectric construction. The 250V rating of the substitute part exceeds the 100V requirement and does not negatively impact performance in 100V applications. No circuit modifications are required.

Q: Are the physical dimensions compatible between these parts?

A: Both parts use through-hole axial mounting with PC pin termination. The WMF1S5K-F measures 0.260" Dia x 0.811" L, while the 473MWR250K measures 0.217" Dia x 0.551" L. The substitute part is physically smaller and will fit in the same PCB footprint designed for the main part.

Q: Do both parts meet the same regulatory compliance standards?

A: Yes. Both the WMF1S5K-F and 473MWR250K are ROHS3 compliant, REACH unaffected, and classified as MSL 1 (unlimited moisture sensitivity). They are equivalent for regulatory purposes.

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

A: Both are polyester-based film dielectrics. Metallized polyester incorporates a thin metal layer on the film surface, which typically provides lower ESR (equivalent series resistance) and improved high-frequency performance. The 473MWR250K explicitly lists "Low ESR" as a feature. For general-purpose DC applications, both dielectric types are functionally equivalent.