WMF1S68K Film Capacitor Equivalent & Substitute Parts

Part Overview

The WMF1S68K is a 0.068 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, necessitating identification of active equivalent parts for ongoing production and maintenance applications. The WMF series represents a legacy product line; however, direct functional equivalents remain available from the same manufacturer with improved compliance status.

Substiute Parts

WMF1S68K

Cornell Dubilier Electronics (CDE)In Stock: 1107WMF1S68K Datasheet

Current PartRFQ

WMF1S68K-F

Cornell Dubilier Electronics (CDE)In Stock: 3586WMF1S68K-F Datasheet

DirectRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution of the WMF1S68K is based on strict electrical and mechanical parameter matching:

Electrical Parameters (Non-negotiable):

• Capacitance value: 0.068 µF (exact match required)
• Voltage rating: 100V DC minimum
• Tolerance: ±10% or tighter
• Dielectric material: Polyester film

Mechanical Parameters (Non-negotiable):

• Package type: Axial through-hole
• Physical dimensions: 0.295" Dia x 0.811" L (7.50mm x 20.60mm)
• Termination style: PC Pins
• Mounting method: Through-hole PCB assembly

Compliance Parameters (Application-dependent):

• RoHS compliance status
• REACH compliance status
• Product status (active vs. obsolete)

The WMF1S68K-F qualifies as a direct substitute because it maintains identical electrical specifications, mechanical form factor, and dimensional characteristics while offering improved product status and regulatory compliance.

Parameter Comparison

Engineering Selection Recommendations

Primary Recommendation: WMF1S68K-F

The WMF1S68K-F is the direct functional equivalent of the WMF1S68K. Selection of WMF1S68K-F is appropriate for the following reasons:

1. Electrical Equivalence: All critical electrical parameters (capacitance, voltage rating, tolerance, dielectric material) are identical.

2. Mechanical Compatibility: Physical dimensions, package type, and termination style are identical, ensuring direct PCB layout compatibility and assembly process compatibility without design modification.

3. Product Status: WMF1S68K-F maintains active product status with established supply chain availability, whereas the main part is obsolete.

4. Regulatory Compliance: WMF1S68K-F achieves ROHS3 compliance, addressing modern regulatory requirements. Both parts maintain REACH Unaffected status.

5. Operating Specifications: Temperature range, moisture sensitivity level, and application classification remain unchanged.

Substitution is direct and does not require circuit redesign, PCB layout modification, or assembly process changes.

Frequently Asked Questions (FAQ)

Q: Can WMF1S68K-F be used as a direct replacement for WMF1S68K without PCB modification?

A: Yes. The WMF1S68K-F maintains identical electrical specifications, physical dimensions (0.295" Dia x 0.811" L), axial package configuration, and PC pin termination. No PCB layout changes are required.

Q: What is the primary reason to substitute WMF1S68K with WMF1S68K-F?

A: The WMF1S68K is classified as obsolete. The WMF1S68K-F is the active equivalent part from the same manufacturer with identical electrical and mechanical characteristics, ensuring continued component availability for production and field replacement applications.

Q: Are the electrical characteristics identical between these parts?

A: Yes. Both parts specify 0.068 µF capacitance, ±10% tolerance, 100V DC rating, polyester dielectric material, and -55°C ~ 125°C operating temperature range.

Q: Does the packaging difference (Standard vs. Bulk) affect electrical performance?

A: No. Packaging designation refers to order quantity and delivery format only. It does not affect component electrical function, performance, or reliability.

Q: Is RoHS compliance a functional requirement for this substitution?

A: RoHS compliance is a regulatory and procurement requirement, not an electrical function requirement. The WMF1S68K-F achieves ROHS3 compliance, making it suitable for applications subject to RoHS regulations. The original WMF1S68K is RoHS non-compliant.

Q: Can other polyester film capacitors with the same capacitance value substitute for WMF1S68K?

A: No. Substitution requires matching all critical parameters: exact capacitance value (0.068 µF), voltage rating (100V DC), tolerance (±10%), dielectric material (polyester), package type (axial), physical dimensions (0.295" Dia x 0.811" L), and termination style (PC Pins). Only WMF1S68K-F meets all these requirements.

Q: What is the lead spacing for this component?

A: Lead spacing is not specified in the provided technical data. Physical dimensions are provided as 0.295" Dia x 0.811" L (7.50mm x 20.60mm).

Q: Are there any temperature derating considerations for this capacitor?

A: Both parts operate across -55°C ~ 125°C. No additional derating information is provided in the technical specifications.