WMF1P1K Film Capacitor Equivalent & Substitute Parts

Part Overview

The WMF1P1K is a 0.1 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 equivalent and substitute parts for ongoing design support and procurement requirements. The WMF series provides general-purpose capacitance in compact axial configurations suitable for legacy and current applications requiring polyester dielectric properties.

Substiute Parts

WMF1P1K

Cornell Dubilier Electronics (CDE)In Stock: 1086WMF1P1K Datasheet

Current PartRFQ

WMF1P1K-F

Cornell Dubilier Electronics (CDE)In Stock: 1967WMF1P1K-F Datasheet

DirectRFQ

WMF2P1K-F

Cornell Dubilier Electronics (CDE)In Stock: 2172WMF2P1K-F Datasheet

DirectRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution eligibility for the WMF1P1K is determined by the following critical parameters:

Primary Compatibility Criteria:

• Capacitance value: 0.1 µF (exact match required)
• Tolerance: ±10% (exact match required)
• Dielectric material: Polyester (exact match required)
• Mounting type: Through hole axial (exact match required)
• Operating temperature range: -55°C to 125°C (exact match required)
• Termination style: PC Pins (exact match required)

Secondary Compatibility Criteria:

• Voltage rating: Equal to or greater than 100V DC
• Physical dimensions: Compatible with board layout constraints
• Product status: Active status preferred for ongoing availability

The WMF1P1K-F serves as a direct equivalent with identical electrical and mechanical specifications but with improved RoHS3 compliance and active product status. The WMF2P1K-F provides voltage uprating capability (250V DC) while maintaining all other core parameters, enabling use in applications requiring higher voltage margins.

Parameter Comparison

Engineering Selection Recommendations

WMF1P1K-F Selection Criteria: The WMF1P1K-F is the direct functional equivalent of the WMF1P1K, providing identical electrical performance and mechanical compatibility. This substitute is recommended for applications where the original WMF1P1K is no longer available. The WMF1P1K-F maintains 100V DC voltage rating, 0.1 µF capacitance, and identical physical dimensions. The primary advantage is active product status with ROHS3 compliance, ensuring long-term procurement viability and regulatory alignment with current manufacturing standards.

WMF2P1K-F Selection Criteria: The WMF2P1K-F is suitable for applications where voltage margin enhancement is beneficial. This part maintains identical capacitance, tolerance, dielectric material, and operating temperature range while providing 250V DC rating. The physical diameter is reduced from 0.335" to 0.319", which may provide board layout advantages in space-constrained designs. This substitute is appropriate for circuits operating below 100V DC where additional voltage headroom is desired for reliability enhancement. Active product status and ROHS3 compliance support long-term availability.

Frequently Asked Questions (FAQ)

Q: Can WMF1P1K-F be used as a direct replacement for WMF1P1K?

A: Yes. The WMF1P1K-F is electrically and mechanically identical to the WMF1P1K. Both parts share the same 0.1 µF capacitance, ±10% tolerance, 100V DC rating, polyester dielectric, and axial through-hole package with identical physical dimensions. The WMF1P1K-F is the recommended substitute due to active product status and ROHS3 compliance.

Q: What is the difference between WMF1P1K-F and WMF2P1K-F?

A: The primary difference is voltage rating. WMF1P1K-F is rated for 100V DC, while WMF2P1K-F is rated for 250V DC. Both maintain 0.1 µF capacitance and identical operating temperature range. The WMF2P1K-F has a slightly smaller diameter (0.319" versus 0.335"), which may affect board layout compatibility. Capacitance and tolerance specifications are identical.

Q: Can WMF2P1K-F replace WMF1P1K in all applications?

A: WMF2P1K-F is suitable for replacement in applications where the circuit voltage does not exceed 100V DC. The higher voltage rating of WMF2P1K-F does not degrade performance in lower-voltage circuits. However, the reduced diameter (0.319" versus 0.335") must be verified for compatibility with existing board layouts and component spacing requirements.

Q: Are there any RoHS compliance differences between these parts?

A: Yes. The WMF1P1K is RoHS non-compliant, while both WMF1P1K-F and WMF2P1K-F are ROHS3 compliant. For applications subject to RoHS regulations or customer requirements, WMF1P1K-F or WMF2P1K-F must be selected.

Q: What is the product status significance?

A: WMF1P1K is classified as obsolete, indicating discontinued manufacturing and limited procurement availability. WMF1P1K-F and WMF2P1K-F are active products with ongoing production and established supply chains, ensuring reliable long-term availability for design support and production requirements.

Q: Are the physical dimensions compatible with existing PCB layouts?

A: WMF1P1K-F maintains identical dimensions to WMF1P1K (0.335" Dia × 0.937" L). WMF2P1K-F has a reduced diameter of 0.319" while maintaining the same length. Both are compatible with through-hole axial component footprints designed for the original WMF1P1K, though WMF2P1K-F may provide improved fit in space-constrained layouts due to its smaller diameter.