SFS37S40K288B

Part Overview

The SFS37S40K288B is a 40 µF Film Capacitor rated at 370V AC, manufactured by Cornell Dubilier Electronics (CDE) in the SF series. This polypropylene (PP) metallized radial capacitor is designed for motor run applications and is currently in active production status. Alternative models may be required due to inventory constraints, compliance requirements, or specific packaging needs in OEM applications.

Substiute Parts

SFS37S40K288B

Cornell Dubilier Electronics (CDE)In Stock: 753SFS37S40K288B Datasheet

Current PartRFQ

23FD3740A-F

Cornell Dubilier Electronics (CDE)In Stock: 112223FD3740A-F Datasheet

SimilarRFQ

Key Parameters

Substitute Part Grouping Explanation

The substitute part 23FD3740A-F qualifies as a direct functional equivalent based on the following critical parameters:

• Capacitance: 40 µF (identical)
• Tolerance: ±10% (identical)
• Voltage Rating (AC): 370V (identical)
• Dielectric Material: Polypropylene (PP), Metallized (identical)
• Operating Temperature Range: -40°C ~ 70°C (identical)
• Package Type: Radial, Can (identical)
• Mounting Type: Chassis Mount, Requires Holder/Bracket (identical)
• Termination: Quick Connect, Disconnect (identical)
• Applications: Motor Run (primary application supported)

The substitute part differs only in series designation (MPF vs. SF), physical dimensions (within tolerance margins), packaging format (Bulk vs. standard), and compliance certifications. These differences do not affect electrical compatibility or performance in the specified application.

Parameter Comparison

Engineering Selection Recommendations

Primary Part (SFS37S40K288B): Select this part for established designs already qualified to non-RoHS standards or where legacy component specifications are contractually required. The original SF series designation provides continuity in bill-of-materials documentation.

Substitute Part (23FD3740A-F): Select this part for new designs, production restocking, or applications requiring RoHS3 compliance. The MPF series offers equivalent electrical performance with enhanced environmental compliance certifications. Physical dimensions are within typical PCB layout tolerances (maximum variation of 0.005" in diameter and 0.160" in height). The expanded inventory availability (1056 units) supports higher-volume production requirements.

Both parts carry identical ECCN (EAR99) and HTSUS (8532.25.0020) classifications and are unaffected by REACH regulations.

Frequently Asked Questions (FAQ)

Q: Can 23FD3740A-F be used as a drop-in replacement for SFS37S40K288B?

A: Yes, from an electrical standpoint. Both capacitors deliver identical capacitance (40 µF), voltage rating (370V AC), tolerance (±10%), and temperature performance. Physical dimensions differ slightly (diameter by 0.005", height by 0.160"), requiring verification that the chassis mount holder accommodates the substitute's maximum dimensions.

Q: What is the primary difference between these two parts?

A: The main differences are product series (SF vs. MPF), RoHS compliance status (non-compliant vs. ROHS3 compliant), and packaging format (standard vs. bulk). Electrical and thermal performance specifications are identical.

Q: Are there restrictions on using the RoHS3-compliant version in legacy equipment?

A: No restriction exists from a functional or compatibility perspective. The RoHS3 designation indicates the part meets current environmental and hazardous substance standards. Use in legacy equipment requires only that the application does not contractually mandate the non-compliant SF series variant.

Q: What are the physical constraint considerations?

A: The substitute part (23FD3740A-F) is 0.160" taller (80.26mm vs. 76.20mm maximum height) and 0.005" larger in diameter (53.98mm vs. 53.85mm). Verify that the chassis mount holder and surrounding component clearances accommodate these dimensions.

Q: Which part should be selected for new equipment designs?

A: The 23FD3740A-F provides superior compliance status (ROHS3) and higher inventory availability. It is the recommended choice for new designs unless the original SFS37S40K288B is explicitly specified by design requirements or legacy documentation.