WMF05W1K-F Equivalent & Substitute Parts

Part Overview

The WMF05W1K-F is a 1 µF film capacitor manufactured by Cornell Dubilier Electronics (CDE) with a 50V DC voltage rating and ±10% tolerance. This polyester dielectric axial-mounted capacitor is designed for general-purpose applications and is currently in active production status. The part is ROHS3 compliant and carries unlimited moisture sensitivity rating (MSL 1).

Substitute parts are identified when equivalent electrical specifications and mechanical compatibility are maintained within the allowed parameter ranges for this product category.

Substiute Parts

WMF05W1K-F

Cornell Dubilier Electronics (CDE)In Stock: 848WMF05W1K-F Datasheet

Current PartRFQ

105MWR050K

Cornell Dubilier / Illinois CapacitorIn Stock: 3509105MWR050K Datasheet

SimilarRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution eligibility for the WMF05W1K-F is determined by the following criteria:

Electrical Parameters (Must Match):

• Capacitance value: 1 µF (exact match required)
• DC voltage rating: 50V minimum (equal or higher acceptable)
• Tolerance: ±10% or tighter

Mechanical Parameters (Must Match):

• Mounting type: Through Hole
• Package configuration: Axial
• Termination style: PC Pins

Material & Compliance (Must Match):

• Dielectric: Polyester-based film
• RoHS3 compliance status
• MSL rating: 1 (Unlimited)

The substitute part 105MWR050K meets all mandatory substitution criteria while maintaining functional equivalence in general-purpose applications.

Parameter Comparison

Engineering Selection Recommendations

Primary Part (WMF05W1K-F): Use when the full operating temperature range of -55°C to 125°C is required. This part maintains active production status and full ROHS3 compliance with unlimited moisture sensitivity rating.

Substitute Part (105MWR050K): The 105MWR050K is electrically and mechanically equivalent for general-purpose applications. Key considerations:

• Operating temperature range is limited to -40°C to 105°C (narrower than main part)
• Physical dimensions are significantly smaller (7.50mm x 11.50mm versus 14.30mm x 34.90mm)
• Metallized polyester dielectric provides lower ESR (1.768 Ohms) compared to standard polyester
• Both parts maintain ROHS3 compliance and active production status
• Both carry identical capacitance, tolerance, and DC voltage specifications

Selection between these parts depends on application temperature requirements and available PCB space. The substitute part's smaller form factor may provide layout advantages in space-constrained designs operating within the -40°C to 105°C range.

Frequently Asked Questions (FAQ)

Q: Can 105MWR050K replace WMF05W1K-F in all applications?

A: Electrical and mechanical compatibility is confirmed for general-purpose applications. However, if the circuit operates below -40°C or above 105°C, the substitute part's narrower temperature range (-40°C to 105°C) makes it unsuitable. The main part's extended range (-55°C to 125°C) is required for such applications.

Q: What is the difference between standard polyester and metallized polyester dielectric?

A: Both are polyester-based film materials. The 105MWR050K uses metallized polyester, which has a thin metal layer deposited on the film surface. This construction results in lower ESR (1.768 Ohms) and more compact dimensions. Standard polyester (WMF05W1K-F) uses non-metallized film.

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

A: The substitute part (105MWR050K) is significantly smaller: 7.50mm x 11.50mm diameter and length versus 14.30mm x 34.90mm for the main part. While both are axial through-hole components with PC pin termination, the smaller substitute may fit in tighter spaces but cannot be used as a direct drop-in replacement if the original layout was designed around the larger dimensions.

Q: Do both parts have the same compliance certifications?

A: Yes. Both WMF05W1K-F and 105MWR050K are ROHS3 compliant, carry MSL 1 (Unlimited) moisture sensitivity rating, and are classified as REACH Unaffected with ECCN EAR99 export classification.

Q: What does the ±10% tolerance mean for these capacitors?

A: The actual capacitance value will be within ±10% of the nominal 1 µF specification. Both parts share identical tolerance, ensuring equivalent performance in circuits where this tolerance band is acceptable.