WMF4D1K Equivalent & Substitute Parts

Part Overview

The WMF4D1K is a 1000 pF film capacitor rated for 400V DC operation with polyester dielectric material and axial through-hole mounting. Manufactured by Cornell Dubilier Electronics (CDE), this component is classified as obsolete. Due to its obsolete product status, identifying equivalent and substitute parts is necessary to maintain design continuity and ensure component availability for production and repair applications.

Substiute Parts

WMF4D1K

Cornell Dubilier Electronics (CDE)In Stock: 930WMF4D1K Datasheet

Current PartRFQ

WMF4D1K-F

Cornell Dubilier Electronics (CDE)In Stock: 1016WMF4D1K-F Datasheet

DirectRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution of the WMF4D1K is determined by strict equivalence across the following critical parameters:

• Capacitance Value: 1000 pF (exact match required)
• Voltage Rating: 400V DC minimum
• Tolerance: ±10%
• Dielectric Type: Polyester film
• Package Configuration: Axial through-hole
• Physical Dimensions: 0.189" Dia x 0.685" L (4.80mm x 17.40mm)
• Operating Temperature Range: -55°C ~ 125°C
• Termination Style: PC Pins

Substitute parts must match all parameters listed above to ensure functional and mechanical compatibility within the original circuit design. The WMF4D1K-F represents a direct equivalent with identical electrical and mechanical specifications.

Parameter Comparison

Engineering Selection Recommendations

WMF4D1K-F is the direct equivalent substitute for the obsolete WMF4D1K. Both parts share identical electrical specifications (1000 pF, ±10%, 400V DC) and mechanical characteristics (axial through-hole, polyester dielectric, identical physical dimensions). The primary distinction is product status: WMF4D1K-F is active and carries ROHS3 compliance certification, whereas the original WMF4D1K is obsolete and RoHS non-compliant.

For new designs and production applications requiring RoHS compliance, WMF4D1K-F is the appropriate selection. For legacy system repairs where RoHS compliance is not a requirement, either part functions identically within the circuit.

The part 102MWR630K is listed as a substitute reference but lacks complete technical specifications in the provided input data. Substitution with this part cannot be confirmed without full parameter documentation.

Frequently Asked Questions (FAQ)

Q: Can WMF4D1K-F be used as a direct replacement for WMF4D1K?

A: Yes. WMF4D1K-F is a direct equivalent with identical capacitance (1000 pF), voltage rating (400V DC), tolerance (±10%), dielectric material (polyester), physical dimensions (0.189" Dia x 0.685" L), and operating temperature range (-55°C ~ 125°C). Both parts are axial through-hole components with PC pin termination.

Q: What is the primary difference between WMF4D1K and WMF4D1K-F?

A: The WMF4D1K-F is an active product with ROHS3 compliance, while the WMF4D1K is obsolete and RoHS non-compliant. Electrical and mechanical specifications are identical.

Q: Are there physical dimension differences between these parts?

A: No. Both WMF4D1K and WMF4D1K-F share identical physical dimensions of 0.189" Dia x 0.685" L (4.80mm x 17.40mm), ensuring identical PCB footprint compatibility.

Q: What applications are these capacitors suitable for?

A: Both parts are rated for general purpose applications requiring 1000 pF capacitance at 400V DC with polyester film dielectric and operating temperatures from -55°C to 125°C.

Q: Is RoHS compliance a factor in selecting between these parts?

A: RoHS compliance is a regulatory consideration. WMF4D1K-F meets ROHS3 requirements, while WMF4D1K does not. Selection depends on application requirements and regulatory jurisdiction.