WMF1S27K Film Capacitor Equivalent & Substitute Parts

Part Overview

The WMF1S27K is a 0.027 µF polyester film capacitor rated for 100V DC operation in an axial through-hole package manufactured by Cornell Dubilier Electronics (CDE). This component is classified as obsolete, which necessitates identification of active equivalent alternatives for ongoing production and maintenance applications. The WMF series represents a legacy product line; however, parametrically equivalent substitutes remain available to maintain circuit functionality and performance specifications.

Substiute Parts

WMF1S27K

Cornell Dubilier Electronics (CDE)In Stock: 1134WMF1S27K Datasheet

Current PartRFQ

WMF1S27K-F

Cornell Dubilier Electronics (CDE)In Stock: 690WMF1S27K-F Datasheet

Parametric EquivalentRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution eligibility for the WMF1S27K is determined by strict parametric matching across the following criteria:

Critical Matching Parameters:

• Capacitance value: 0.027 µF (exact match required)
• Tolerance: ±10% (exact match required)
• Voltage rating: 100V DC minimum (equal or higher acceptable)
• Dielectric material: Polyester (exact match required)
• Operating temperature range: -55°C to 125°C (equal or wider range acceptable)
• Mounting type: Through Hole (exact match required)
• Package configuration: Axial (exact match required)
• Physical dimensions: 0.236" Dia × 0.685" L (exact match required)
• Termination style: PC Pins (exact match required)

The WMF1S27K-F meets all critical parameters and qualifies as a parametric equivalent. The primary distinction between the main part and its substitute is product status and regulatory compliance.

Parameter Comparison

Engineering Selection Recommendations

WMF1S27K-F is the recommended substitute for the obsolete WMF1S27K. Both components are electrically and mechanically identical across all functional parameters. The WMF1S27K-F offers the following advantages:

• Active Product Status: The WMF1S27K-F is currently in active production, ensuring long-term availability and supply chain continuity.
• Regulatory Compliance: The WMF1S27K-F is RoHS3 compliant, meeting current environmental and regulatory requirements for new equipment designs and manufacturing processes.
• Identical Electrical Performance: All electrical specifications—capacitance, tolerance, voltage rating, temperature range, and dielectric properties—are identical to the original part.
• Direct Physical Compatibility: Axial package configuration, physical dimensions, and PC pin termination are identical, enabling direct board-level substitution without layout modifications.

Selection of the WMF1S27K-F eliminates obsolescence risk while maintaining full circuit compatibility and performance.

Frequently Asked Questions (FAQ)

Q: Can the WMF1S27K-F be used as a direct replacement for the WMF1S27K?

A: Yes. The WMF1S27K-F is a parametric equivalent with identical electrical and mechanical specifications. Direct substitution is possible without circuit redesign or board layout changes.

Q: What is the primary reason to substitute the WMF1S27K?

A: The WMF1S27K is classified as obsolete. The WMF1S27K-F is an active product that ensures continued availability and compliance with current regulatory standards.

Q: Are there any differences in electrical performance between these parts?

A: No. Both parts have identical capacitance (0.027 µF), tolerance (±10%), voltage rating (100V DC), dielectric material (polyester), and operating temperature range (-55°C to 125°C).

Q: Will the WMF1S27K-F fit in the same PCB footprint?

A: Yes. Both components share identical physical dimensions (0.236" Dia × 0.685" L / 6.00mm × 17.40mm) and axial package configuration. No board layout modifications are required.

Q: What is the significance of RoHS3 compliance on the WMF1S27K-F?

A: RoHS3 compliance indicates the WMF1S27K-F meets current environmental and hazardous substance restrictions. This is important for new equipment designs and markets with regulatory requirements for restricted materials.

Q: Are the termination styles identical?

A: Yes. Both the WMF1S27K and WMF1S27K-F use PC pins for termination, ensuring compatibility with standard through-hole soldering processes.

Q: Is there any difference in moisture sensitivity?

A: No. Both parts have an MSL rating of 1 (Unlimited), indicating no moisture sensitivity concerns for storage or handling.