WMF05P39K-F Equivalent & Substitute Parts

Part Overview

The WMF05P39K-F is a 0.39 µF film capacitor manufactured by Cornell Dubilier Electronics (CDE) with a 50V DC voltage rating and ±10% tolerance. This polyester dielectric axial-mounted capacitor operates across a temperature range of -55°C to 125°C and is designed for general-purpose applications. The part maintains Active product status with 1082 units in current inventory. Equivalent and substitute parts are identified to support procurement flexibility, design optimization, and supply chain continuity.

Substiute Parts

WMF05P39K-F

Cornell Dubilier Electronics (CDE)In Stock: 1184WMF05P39K-F Datasheet

Current PartRFQ

334MWR050K

Cornell Dubilier / Illinois CapacitorIn Stock: 1138334MWR050K Datasheet

SimilarRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitute parts for the WMF05P39K-F are identified based on the following critical parameters that determine functional compatibility:

Primary Substitution Criteria:

• Voltage Rating - DC: Minimum 50V required
• Dielectric Material: Polyester or metallized polyester
• Mounting Type: Through Hole axial configuration
• Termination: PC Pins
• Tolerance: ±10%
• RoHS Compliance: ROHS3 Compliant

Capacitance Consideration: The substitute part 334MWR050K operates at 0.33 µF, representing a 15.4% reduction from the primary part's 0.39 µF rating. This capacitance variance falls within the ±10% tolerance band of the primary part and is acceptable for general-purpose applications where exact capacitance matching is not critical to circuit function.

Physical and Environmental Factors: Both parts utilize polyester dielectric materials with PC pin termination and axial through-hole mounting. The substitute part features a smaller physical footprint (6.00mm × 11.50mm versus 10.30mm × 27.00mm) and operates within a narrower temperature range (-40°C to 105°C versus -55°C to 125°C). These differences must be evaluated against specific application requirements.

Parameter Comparison

Engineering Selection Recommendations

Primary Part Selection (WMF05P39K-F): The WMF05P39K-F is recommended for applications requiring the specified 0.39 µF capacitance with extended temperature operation from -55°C to 125°C. This part maintains Active product status with robust inventory availability and full ROHS3 compliance.

Substitute Part Selection (334MWR050K): The 334MWR050K serves as a functional substitute where the following conditions are met:

• Circuit design tolerates 0.33 µF capacitance (within ±10% tolerance specification)
• Operating temperature range does not exceed -40°C to 105°C
• Physical footprint reduction (6.00mm × 11.50mm) is compatible with PCB layout constraints
• Metallized polyester dielectric with low ESR characteristics aligns with application requirements

Both parts maintain ROHS3 compliance, REACH unaffected status, and EAR99 export classification. Both feature MSL 1 (Unlimited) moisture sensitivity ratings, indicating no special handling requirements during storage or assembly.

Frequently Asked Questions (FAQ)

Q: Can the 334MWR050K directly replace the WMF05P39K-F in all applications?

A: The 334MWR050K is functionally compatible for general-purpose applications where the 0.33 µF capacitance value falls within acceptable circuit tolerances. However, applications requiring the full 0.39 µF specification or operating temperatures below -40°C or above 105°C require the primary WMF05P39K-F part.

Q: What is the capacitance difference between these parts, and does it matter?

A: The 334MWR050K provides 0.33 µF compared to the WMF05P39K-F at 0.39 µF, a difference of 0.06 µF or approximately 15.4%. Both parts carry ±10% tolerance ratings. For filtering, coupling, and general-purpose applications, this variance is typically acceptable. For precision timing or frequency-critical circuits, the primary part specification should be maintained.

Q: Are there physical space considerations when substituting these parts?

A: Yes. The 334MWR050K measures 6.00mm × 11.50mm, significantly smaller than the WMF05P39K-F at 10.30mm × 27.00mm. The substitute part's reduced footprint may allow for improved PCB layout efficiency but requires verification that the smaller axial lead spacing accommodates existing through-hole pad configurations.

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

A: Both parts are ROHS3 compliant, REACH unaffected, and classified as EAR99 for export purposes. Both carry MSL 1 (Unlimited) moisture sensitivity ratings, eliminating special handling requirements. Compliance profiles are equivalent for regulatory purposes.

Q: What is the temperature operating range difference, and when does it matter?

A: The WMF05P39K-F operates from -55°C to 125°C, while the 334MWR050K operates from -40°C to 105°C. Applications requiring operation below -40°C or above 105°C must use the primary part. Standard industrial and consumer applications typically operate within the substitute part's range.

Q: Are there performance differences between standard polyester and metallized polyester dielectrics?

A: The 334MWR050K features metallized polyester with specified low ESR characteristics, while the WMF05P39K-F uses standard polyester. Metallized polyester typically provides lower equivalent series resistance and improved high-frequency performance. For DC filtering and general-purpose applications, both dielectric types perform equivalently.

Q: How do I verify which part is correct for my specific application?

A: Evaluate your circuit requirements against the following parameters: required capacitance value (0.39 µF or 0.33 µF), operating temperature range, voltage rating (both support 50V DC), physical space constraints, and frequency response characteristics. Consult your circuit schematic and design specifications to confirm compatibility.