Equivalent & Substitute Parts for 24FB4440A-F Film Capacitor

Part Overview

The 24FB4440A-F is a 40 µF film capacitor rated for 440V AC operation, manufactured by Cornell Dubilier Electronics (CDE) from the MPF series. This radial, metallized polypropylene capacitor is designed for motor run and power factor correction applications in industrial equipment. The part is currently active in production with 996 units in stock. Substitute parts are identified to provide alternative sourcing options when the primary part number becomes unavailable or when inventory constraints require component alternatives.

Substiute Parts

24FB4440A-F

Cornell Dubilier Electronics (CDE)In Stock: 106924FB4440A-F Datasheet

Current PartRFQ

SFT44T40K391B-F

Cornell Dubilier Electronics (CDE)In Stock: 949SFT44T40K391B-F Datasheet

DirectRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution eligibility for the 24FB4440A-F is determined by strict equivalence across the following critical parameters:

Electrical Parameters (Non-Negotiable):

• Capacitance: 40 µF (exact match required)
• Tolerance: ±10% (exact match required)
• Voltage Rating (AC): 440V (exact match required)
• Dielectric Material: Polypropylene (PP), Metallized (exact match required)

Mechanical Parameters (Non-Negotiable):

• Package Type: Radial, Can (exact match required)
• Mounting Type: Chassis Mount, Requires Holder/Bracket (exact match required)
• Termination: Quick Connect, Disconnect (exact match required)

Environmental & Compliance Parameters:

• Operating Temperature Range: -40°C to 70°C (exact match required)
• RoHS Status: ROHS3 Compliant (exact match required)

The substitute part SFT44T40K391B-F meets all critical electrical, mechanical, and environmental parameters. Both parts are manufactured by Cornell Dubilier Electronics and share identical functional specifications for motor run and power factor correction applications.

Parameter Comparison

Engineering Selection Recommendations

Both the 24FB4440A-F and SFT44T40K391B-F are active production parts manufactured by Cornell Dubilier Electronics. Selection between these parts is based on the following criteria:

Primary Part (24FB4440A-F):

• Use when MPF series availability is confirmed
• Higher current inventory level (996 units)
• Established supply chain for this series designation

Substitute Part (SFT44T40K391B-F):

• Use when MPF series is unavailable or on backorder
• SF series provides equivalent electrical and mechanical performance
• Adequate inventory level (910 units) for production requirements
• Identical compliance certifications (ROHS3, REACH Unaffected, EAR99)

Both parts satisfy all regulatory and environmental requirements for industrial motor run and power factor correction applications. Physical dimensions show minor variations (diameter and height differences within manufacturing tolerances) that do not affect functional performance in chassis-mounted applications requiring holder/bracket support.

Frequently Asked Questions (FAQ)

Q: Can SFT44T40K391B-F be used as a direct replacement for 24FB4440A-F?

A: Yes. Both parts have identical electrical specifications (40 µF, ±10%, 440V AC), dielectric material (polypropylene metallized), operating temperature range (-40°C to 70°C), mounting type (chassis mount with holder/bracket), and termination style (quick connect/disconnect). They are functionally equivalent for motor run and power factor correction applications.

Q: Are there physical dimension differences between these parts?

A: Minor dimensional variations exist. The 24FB4440A-F has a diameter of 2.625" (66.68mm) and height of 4.160" (105.66mm), while the SFT44T40K391B-F has a diameter of 2.620" (66.55mm) and height of 4.030" (102.36mm). Lead spacing differs slightly (0.813" versus 0.810"). These variations are within manufacturing tolerances and do not affect compatibility in applications using holder/bracket mounting.

Q: Do both parts meet the same compliance standards?

A: Yes. Both the 24FB4440A-F and SFT44T40K391B-F are ROHS3 compliant, REACH unaffected, and classified as EAR99 for export control purposes. Moisture sensitivity level differs (MSL 1 for the main part, not applicable for the substitute), but this does not affect performance in sealed or controlled storage conditions.

Q: What is the difference between the MPF and SF series designations?

A: The MPF and SF series are different product lines from Cornell Dubilier Electronics. Both series use identical polypropylene metallized dielectric technology and meet the same electrical and environmental specifications for this 40 µF, 440V AC application. Series designation reflects internal manufacturing and design lineage but does not indicate functional differences.

Q: Which part should be selected for new designs?

A: Selection should be based on current availability and supply chain stability. Both parts are active production items. Verify inventory status and lead times with your supplier before design finalization. Either part is acceptable for motor run and power factor correction applications requiring 40 µF, 440V AC film capacitors with radial can packaging.