WMF1W1K Film Capacitor Equivalent & Substitute Parts

Part Overview

The WMF1W1K is a 1 µF film capacitor rated for 100V DC with polyester dielectric material, manufactured by Cornell Dubilier Electronics (CDE). This component is classified as obsolete, which necessitates identification of equivalent substitute parts for ongoing circuit design and maintenance applications. The WMF series axial film capacitor is designed for general-purpose applications requiring stable capacitance and reliable performance across industrial temperature ranges.

Substiute Parts

WMF1W1K

Cornell Dubilier Electronics (CDE)In Stock: 1148WMF1W1K Datasheet

Current PartRFQ

WMF1W1K-F

Cornell Dubilier Electronics (CDE)In Stock: 1060WMF1W1K-F Datasheet

DirectRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution of the WMF1W1K is determined by strict equivalence across the following electrical and mechanical parameters:

Primary Substitution Criteria:

• Capacitance value: 1 µF (exact match required)
• Voltage rating: 100V DC minimum
• Dielectric type: Polyester film
• Tolerance: ±10%
• Operating temperature range: -55°C to 125°C minimum
• Mounting configuration: Through-hole axial
• Physical package dimensions: 0.669" Dia × 1.500" L

Substitute Classification:

The WMF1W1K-F represents a direct manufacturer equivalent from Cornell Dubilier Electronics. This part maintains identical electrical specifications and physical dimensions while offering active product status and improved compliance certifications. The part 105MWR100K is listed as an additional substitute option meeting the core electrical and mechanical parameters.

Parameter Comparison

Engineering Selection Recommendations

WMF1W1K-F Selection Rationale:

The WMF1W1K-F is the primary recommended substitute for the obsolete WMF1W1K. This part maintains complete electrical and mechanical equivalence while offering active product status and ROHS3 compliance certification. For applications subject to RoHS regulatory requirements or requiring components with current manufacturing support, the WMF1W1K-F provides direct compatibility with identical physical dimensions, electrical ratings, and performance characteristics.

105MWR100K Consideration:

The 105MWR100K is listed as an additional substitute option. Complete parameter specifications for this part are not provided in the available documentation. Selection of this alternative requires verification of all electrical and mechanical parameters against application requirements.

Compliance and Availability:

The WMF1W1K-F maintains REACH Unaffected status consistent with the original part. Current inventory availability is documented at 1026 pieces for the WMF1W1K-F, supporting production and maintenance requirements.

Frequently Asked Questions (FAQ)

Q: Can the WMF1W1K-F be used as a direct replacement for WMF1W1K in existing circuit designs?

A: Yes. The WMF1W1K-F maintains identical capacitance (1 µF), voltage rating (100V DC), tolerance (±10%), dielectric material (polyester), operating temperature range (-55°C to 125°C), and physical dimensions (0.669" Dia × 1.500" L). The axial through-hole configuration and PC pin termination are unchanged, enabling direct board-level substitution.

Q: What is the primary difference between WMF1W1K and WMF1W1K-F?

A: The WMF1W1K-F is the active production equivalent of the obsolete WMF1W1K. The primary differences are product status (active versus obsolete) and RoHS compliance certification (ROHS3 compliant versus non-compliant). Electrical and mechanical specifications are identical.

Q: Are there physical dimension differences between substitute parts?

A: The WMF1W1K and WMF1W1K-F share identical physical dimensions of 0.669" diameter by 1.500" length (17.00mm × 38.10mm). This ensures compatibility with existing PCB layouts and mechanical assemblies. Complete dimensional data for the 105MWR100K is not provided in available documentation.

Q: What compliance certifications apply to substitute parts?

A: The WMF1W1K-F carries ROHS3 compliance certification and REACH Unaffected status. The original WMF1W1K is RoHS non-compliant but also REACH Unaffected. Selection between these parts depends on regulatory requirements applicable to the end application.

Q: Is the operating temperature range maintained across substitute parts?

A: The WMF1W1K-F maintains the identical operating temperature range of -55°C to 125°C. This specification is critical for applications requiring performance across extended industrial temperature environments.