Cornell Dubilier Electronics 21FD3715 Film Capacitor Equivalent & Substitute Parts

Part Overview

The Cornell Dubilier Electronics 21FD3715 is a 15 µF film capacitor rated for 370V AC operation with polypropylene dielectric material in a radial, can-style package. This component is classified as obsolete product status. Equivalent and substitute parts are necessary to maintain system functionality and ensure continued availability for motor run and power factor correction applications where this capacitor is deployed.

Substiute Parts

21FD3715

Cornell Dubilier Electronics (CDE)In Stock: 76521FD3715 Datasheet

Current PartRFQ

21FB4415A-F

Cornell Dubilier Electronics (CDE)In Stock: 82621FB4415A-F Datasheet

DirectRFQ

21FD3715A-F

Cornell Dubilier Electronics (CDE)In Stock: 67421FD3715A-F Datasheet

DirectRFQ

SFP37T15K238B-F

Cornell Dubilier Electronics (CDE)In Stock: 1023SFP37T15K238B-F Datasheet

DirectRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitute parts for the 21FD3715 are qualified based on the following critical parameters that determine functional compatibility:

Primary Substitution Criteria:

• Capacitance value: 15 µF (exact match required)
• Tolerance: ±10% (exact match required)
• Dielectric material: Polypropylene (PP), Metallized (exact match required)
• Package type: Radial, Can (exact match required)
• Termination style: Quick Connect, Disconnect (exact match required)
• Operating temperature range: -40°C ~ 70°C (exact match required)
• Mounting type: Chassis Mount, Requires Holder/Bracket (exact match required)

Secondary Substitution Criteria:

• Voltage rating: Equal to or greater than 370V AC
• Physical dimensions: Compatible with existing mechanical mounting constraints
• Lead spacing: Within acceptable tolerance for connection compatibility

The substitute parts listed below satisfy all primary criteria and maintain compatibility with the original 21FD3715 application requirements.

Parameter Comparison

Engineering Selection Recommendations

21FD3715A-F (Recommended Primary Substitute)

The 21FD3715A-F is the direct equivalent to the obsolete 21FD3715. Both parts share identical electrical specifications: 15 µF capacitance, ±10% tolerance, 370V AC rating, and polypropylene metallized dielectric. The 21FD3715A-F maintains the same series designation (MPF) and is currently in active product status with 661 units in stock. This part achieves ROHS3 compliance and REACH unaffected status, addressing regulatory requirements. Physical dimensions are nearly identical with only a marginal reduction in seated height (2.630" versus 2.880"), which is compatible with standard mounting configurations. Lead spacing remains at 0.813" (20.64mm), ensuring direct connection compatibility.

SFP37T15K238B-F (Alternative Substitute)

The SFP37T15K238B-F provides functional equivalence with identical electrical parameters: 15 µF capacitance, ±10% tolerance, 370V AC rating, and polypropylene metallized dielectric. This part belongs to the SF series and is in active product status with 1004 units in stock. Physical dimensions are slightly reduced (1.870" diameter, 2.500" seated height) compared to the original part, requiring verification of mechanical clearance in existing mounting configurations. Lead spacing is 0.810" (20.57mm), which is within acceptable tolerance for connection compatibility. ROHS3 compliance and REACH unaffected status are confirmed.

21FB4415A-F (Higher Voltage Substitute)

The 21FB4415A-F is functionally compatible with elevated voltage capability: 15 µF capacitance, ±10% tolerance, and 440V AC rating (versus 370V). This part is suitable for applications where higher voltage margin is beneficial. Physical dimensions and lead spacing are identical to the 21FD3715A-F. ROHS3 compliance and REACH unaffected status are confirmed. Selection of this part is appropriate when system voltage specifications permit the higher rating.

Frequently Asked Questions (FAQ)

Q: Can the 21FD3715A-F be used as a direct replacement for the obsolete 21FD3715?

A: Yes. The 21FD3715A-F is the direct equivalent with identical electrical specifications (15 µF, ±10%, 370V AC, polypropylene metallized dielectric) and the same series designation (MPF). Physical dimensions are compatible with standard mounting configurations. The primary difference is active product status and ROHS3 compliance.

Q: What is the difference between the 21FD3715A-F and SFP37T15K238B-F?

A: Both parts have identical electrical specifications (15 µF, ±10%, 370V AC, polypropylene metallized dielectric). The 21FD3715A-F belongs to the MPF series, while the SFP37T15K238B-F belongs to the SF series. The SFP37T15K238B-F has slightly reduced physical dimensions (1.870" diameter, 2.500" seated height versus 1.875" diameter, 2.630" seated height). Lead spacing differs marginally (0.810" versus 0.813"). Mechanical clearance verification is required when substituting with the SFP37T15K238B-F.

Q: When should the 21FB4415A-F be selected instead of the 21FD3715A-F?

A: The 21FB4415A-F is selected when the application permits or requires a higher voltage rating. Both parts share identical capacitance (15 µF), tolerance (±10%), and dielectric material (polypropylene metallized). The 21FB4415A-F provides 440V AC rating compared to 370V AC, offering increased voltage margin. Physical dimensions and lead spacing are identical to the 21FD3715A-F.

Q: Are all substitute parts RoHS compliant?

A: The 21FD3715 is RoHS non-compliant. All three substitute parts (21FD3715A-F, 21FB4415A-F, and SFP37T15K238B-F) are ROHS3 compliant, addressing regulatory requirements for new designs and applications subject to RoHS directives.

Q: What are the mechanical compatibility considerations when substituting these parts?

A: All substitute parts maintain the radial, can-style package with quick connect/disconnect termination. The 21FD3715A-F and 21FB4415A-F have identical lead spacing (0.813") and nearly identical physical dimensions to the original part. The SFP37T15K238B-F has slightly reduced dimensions and lead spacing of 0.810" (20.57mm). Verification of mechanical clearance in existing mounting configurations is required, particularly when substituting with the SFP37T15K238B-F.

Q: Can these parts be used in power factor correction (PFC) applications?

A: The 21FD3715, 21FD3715A-F, and 21FB4415A-F are all rated for power factor correction applications. The SFP37T15K238B-F is rated for motor run applications. Confirm application requirements before selecting the SFP37T15K238B-F for PFC use.

Q: What is the lead spacing tolerance for connection compatibility?

A: The original 21FD3715 has lead spacing of 0.813" (20.64mm). The 21FD3715A-F and 21FB4415A-F maintain identical spacing. The SFP37T15K238B-F has lead spacing of 0.810" (20.57mm), representing a 0.03mm difference. This difference is within acceptable tolerance for standard quick connect/disconnect termination systems.