WMF1P33K Film Capacitor Equivalent & Substitute Parts

Part Overview

The WMF1P33K is a 0.33 µF film capacitor manufactured by Cornell Dubilier Electronics (CDE) with a 100V DC voltage rating and polyester dielectric. This component is classified as obsolete, which necessitates identification of active equivalent parts for continued system support and procurement.

The WMF1P33K operates across a temperature range of -55°C to 125°C and is designed for general-purpose applications requiring through-hole axial mounting. Due to its obsolete status, sourcing direct replacements from active product lines is essential for manufacturing continuity and long-term component availability.

Substiute Parts

WMF1P33K

Cornell Dubilier Electronics (CDE)In Stock: 1076WMF1P33K Datasheet

Current PartRFQ

WMF1P33K-F

Cornell Dubilier Electronics (CDE)In Stock: 2978WMF1P33K-F Datasheet

DirectRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution of the WMF1P33K is based on strict electrical and mechanical parameter matching within the film capacitor category. The following parameters determine substitution eligibility:

Electrical Parameters (Non-negotiable):

• Capacitance value: 0.33 µF
• Voltage rating: 100V DC minimum
• Tolerance: ±10%
• Dielectric material: Polyester

Mechanical Parameters (Non-negotiable):

• Mounting type: Through Hole
• Package style: Axial
• Physical dimensions: 0.413" Dia x 1.185" L (10.50mm x 30.10mm)
• Termination: PC Pins

Environmental Parameters:

• Operating temperature range: -55°C to 125°C

Substitute parts must satisfy all parameters listed above. Packaging format (bulk vs. tape/reel) does not affect electrical or mechanical compatibility and therefore does not restrict substitution eligibility.

Parameter Comparison

Engineering Selection Recommendations

The WMF1P33K-F is a direct functional equivalent to the WMF1P33K. Both components are manufactured by Cornell Dubilier Electronics within the WMF series and share identical electrical, mechanical, and environmental specifications.

Primary Advantage: The WMF1P33K-F maintains active product status, ensuring long-term availability and supply chain continuity. This is the critical distinction between the obsolete WMF1P33K and its active substitute.

Compliance Consideration: The WMF1P33K-F achieves ROHS3 compliance, whereas the WMF1P33K is RoHS non-compliant. For applications subject to RoHS regulations or customer requirements, the WMF1P33K-F is the appropriate selection.

Packaging: The WMF1P33K-F is supplied in bulk packaging format. This does not affect electrical performance or mechanical compatibility; it represents a procurement and handling difference only.

Selection Criteria: Choose WMF1P33K-F for all new designs and replacement applications. The WMF1P33K should be phased out due to obsolete status.

Frequently Asked Questions (FAQ)

Q: Can WMF1P33K-F be used as a direct replacement for WMF1P33K?

A: Yes. The WMF1P33K-F is electrically and mechanically identical to the WMF1P33K. All critical parameters—capacitance, voltage rating, tolerance, dielectric material, operating temperature range, mounting type, package style, and physical dimensions—are identical. No circuit modifications or PCB redesign are required.

Q: What is the difference between WMF1P33K and WMF1P33K-F?

A: The primary differences are product status and compliance certification. The WMF1P33K is obsolete; the WMF1P33K-F is active. The WMF1P33K-F is ROHS3 compliant, while the WMF1P33K is RoHS non-compliant. Packaging format differs (standard vs. bulk), but this does not affect electrical or mechanical performance.

Q: Will WMF1P33K-F fit the same PCB footprint as WMF1P33K?

A: Yes. Both components have identical physical dimensions (0.413" Dia x 1.185" L / 10.50mm x 30.10mm), axial package style, and PC pin termination. No PCB layout modifications are necessary.

Q: Are there any temperature or voltage derating considerations when substituting WMF1P33K-F for WMF1P33K?

A: No. Both components operate across the identical temperature range (-55°C to 125°C) and share the same 100V DC voltage rating. No derating adjustments are required.

Q: Why is WMF1P33K marked as obsolete?

A: The WMF1P33K has been discontinued by Cornell Dubilier Electronics. The WMF1P33K-F represents the active equivalent within the same product series and should be used for all future procurement and design activities.

Q: Does the bulk packaging of WMF1P33K-F affect component quality or performance?

A: No. Packaging format (bulk vs. standard) is a procurement and logistics consideration only. It does not affect electrical characteristics, mechanical properties, or component reliability.