Equivalent & Substitute Parts for Cornell Dubilier Electronics 23FB4440

Part Overview

The Cornell Dubilier Electronics 23FB4440 is a 40 µF film capacitor rated for 440V AC operation, designed for motor run and power factor correction applications. This polypropylene metallized radial capacitor operates across a temperature range of -40°C to 70°C and features quick connect/disconnect termination for chassis mount installation. The part is currently active in production with 1,056 units in stock. Substitute parts are identified to provide alternatives with equivalent electrical performance and mechanical compatibility for applications requiring this capacitor specification.

Substiute Parts

23FB4440

Cornell Dubilier Electronics (CDE)In Stock: 110923FB4440 Datasheet

Current PartRFQ

SFS44T40J384B-00DU

Cornell Dubilier Electronics (CDE)In Stock: 779SFS44T40J384B-00DU Datasheet

DirectRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution eligibility for the 23FB4440 is determined by the following critical parameters:

Electrical Equivalence Requirements:

• Capacitance value: 40 µF (exact match required)
• Voltage rating: 440V AC minimum (equal or higher acceptable)
• Dielectric material: Polypropylene (PP), Metallized (required for application compatibility)

Mechanical Compatibility Requirements:

• Package type: Radial, Can configuration
• Mounting type: Chassis Mount with holder/bracket support
• Termination: Quick Connect, Disconnect capability
• Operating temperature range: -40°C to 70°C minimum coverage

Tolerance Consideration: The 23FB4440 specifies ±10% tolerance. Substitute parts with tighter tolerance specifications (such as ±5%) remain functionally compatible and provide improved accuracy for the application.

The identified substitute SFS44T40J384B-00DU meets all electrical and mechanical compatibility criteria while offering enhanced tolerance performance.

Parameter Comparison

Engineering Selection Recommendations

Primary Selection (23FB4440): The 23FB4440 remains the primary specification for new designs and direct replacement applications. This part is active in production with robust inventory availability (1,056 units). The ±10% tolerance specification is suitable for standard motor run and power factor correction circuit requirements.

Substitute Selection (SFS44T40J384B-00DU): The SFS44T40J384B-00DU is a direct functional equivalent with improved tolerance performance (±5% versus ±10%). This substitute is appropriate when tighter capacitance accuracy is required for the application. The SFS44T40J384B-00DU carries ROHS3 compliance status, providing environmental regulatory advantage over the non-compliant 23FB4440. Both parts maintain identical electrical ratings, operating temperature range, and mechanical mounting characteristics.

Compliance Consideration: The 23FB4440 is RoHS non-compliant, while the SFS44T40J384B-00DU is ROHS3 compliant. For applications subject to RoHS requirements, the substitute part is the appropriate selection.

Frequently Asked Questions (FAQ)

Q: Can the SFS44T40J384B-00DU directly replace the 23FB4440 in existing motor run applications?

A: Yes. Both capacitors share identical capacitance (40 µF), voltage rating (440V AC), dielectric material (polypropylene metallized), operating temperature range (-40°C to 70°C), and mechanical mounting configuration (radial can with quick connect/disconnect termination). The substitute operates within the same application envelope.

Q: What is the difference between ±10% and ±5% tolerance in this application?

A: Tolerance specifies the allowable deviation from the nominal 40 µF capacitance value. The 23FB4440 allows deviation between 36 µF and 44 µF. The SFS44T40J384B-00DU allows deviation between 38 µF and 42 µF. For motor run and power factor correction circuits, both tolerance ranges are functionally acceptable. Tighter tolerance (±5%) provides improved circuit performance when precise capacitance values are critical to system operation.

Q: Are the physical dimensions compatible between these two parts?

A: The parts have nearly identical dimensions. The 23FB4440 measures 2.125" diameter (53.98 mm) with 4.000" maximum seated height (101.60 mm). The SFS44T40J384B-00DU measures 2.120" diameter (53.85 mm) with 3.960" maximum seated height (100.58 mm). These minor dimensional variations do not affect mechanical compatibility in standard chassis mount holder/bracket installations.

Q: What is the lead spacing for both capacitors?

A: The 23FB4440 specifies 0.813" (20.64 mm) lead spacing. The SFS44T40J384B-00DU specifies 0.810" (20.57 mm) lead spacing. This minimal difference does not affect compatibility with standard quick connect/disconnect termination systems.

Q: Does RoHS compliance affect electrical performance?

A: No. RoHS compliance relates to material composition and environmental regulatory status, not electrical performance. Both the RoHS non-compliant 23FB4440 and ROHS3 compliant SFS44T40J384B-00DU deliver identical electrical characteristics for the application.

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

A: For new designs subject to RoHS requirements, specify the SFS44T40J384B-00DU. For applications without RoHS mandates, either part is acceptable. The SFS44T40J384B-00DU offers the additional advantage of tighter tolerance specification.

Q: Are both parts available in the same packaging format?

A: The 23FB4440 is packaged in standard format. The SFS44T40J384B-00DU is supplied in bulk packaging. Both are suitable for component procurement and integration into motor run and power factor correction assemblies.