Equivalent & Substitute Parts for Cornell Dubilier Electronics 23FD3740

Part Overview

The Cornell Dubilier Electronics 23FD3740 is a 40 µF film capacitor rated for 370V AC operation with polypropylene metallized dielectric construction. This component is designed for motor run and power factor correction applications in chassis-mounted configurations. The 23FD3740 is classified as obsolete, necessitating identification of active equivalent alternatives that maintain electrical and mechanical compatibility for continued system operation and maintenance.

Key Parameters

Parameter	Specification
Capacitance	40 µF
Tolerance	±10%
Voltage Rating (AC)	370V
Dielectric Material	Polypropylene (PP), Metallized
Operating Temperature Range	-40°C to 70°C
Mounting Type	Chassis Mount, Requires Holder/Bracket
Package Type	Radial, Can
Termination	Quick Connect, Disconnect
Applications	Motor Run; Power Factor Correction (PFC)

Substitute Part Grouping Explanation

Substitution eligibility for the 23FD3740 is determined by strict equivalence across the following critical parameters:

Electrical Equivalence Requirements:

Capacitance: 40 µF (exact match)
Tolerance: ±10% (exact match)
Voltage Rating (AC): 370V (exact match)
Dielectric Material: Polypropylene (PP), Metallized (exact match)
Operating Temperature Range: -40°C to 70°C (exact match)

Mechanical Equivalence Requirements:

Mounting Type: Chassis Mount, Requires Holder/Bracket (exact match)
Package Type: Radial, Can (exact match)
Termination: Quick Connect, Disconnect (exact match)
Lead Spacing: 0.810" to 0.813" (within tolerance)
Physical Dimensions: Compatible with standard radial can mounting

All substitute parts listed meet these criteria and are manufactured by Cornell Dubilier Electronics within the MPF and SF series product lines.

Parameter Comparison

Parameter	23FD3740	23FD3740A-F	SFS37S40K288B	SFS37T40K291B-F
Manufacturer	Cornell Dubilier Electronics	Cornell Dubilier Electronics	Cornell Dubilier Electronics	Cornell Dubilier Electronics
Series	MPF	MPF	SF	SF
Product Status	Obsolete	Active	Active	Active
Capacitance	40 µF	40 µF	40 µF	40 µF
Tolerance	±10%	±10%	±10%	±10%
Voltage Rating (AC)	370V	370V	370V	370V
Dielectric Material	Polypropylene (PP), Metallized	Polypropylene (PP), Metallized	Polypropylene (PP), Metallized	Polypropylene (PP), Metallized
Operating Temperature	-40°C to 70°C	-40°C to 70°C	-40°C to 70°C	-40°C to 70°C
Mounting Type	Chassis Mount, Requires Holder/Bracket	Chassis Mount, Requires Holder/Bracket	Chassis Mount, Requires Holder/Bracket	Chassis Mount, Requires Holder/Bracket
Package Type	Radial, Can	Radial, Can	Radial, Can	Radial, Can
Termination	Quick Connect, Disconnect	Quick Connect, Disconnect	Quick Connect, Disconnect	Quick Connect, Disconnect
Lead Spacing	0.813" (20.64mm)	0.813" (20.64mm)	0.810" (20.57mm)	0.810" (20.57mm)
Height (Max)	3.250" (82.55mm)	3.160" (80.26mm)	3.000" (76.20mm)	3.030" (76.96mm)
Size Diameter	2.125" (53.98mm)	2.125" (53.98mm)	2.120" (53.85mm)	2.120" (53.85mm)
RoHS Status	RoHS non-compliant	ROHS3 Compliant	RoHS non-compliant	ROHS3 Compliant
Inventory Status	1159 Pcs In Stock	1056 Pcs In Stock	682 Pcs In Stock	1061 Pcs In Stock

Engineering Selection Recommendations

For New Designs and RoHS-Compliant Applications:

The 23FD3740A-F and SFS37T40K291B-F are the preferred substitutes. Both parts maintain active product status and comply with ROHS3 requirements. The 23FD3740A-F remains within the MPF series and preserves the original lead spacing of 0.813" (20.64mm), offering the closest dimensional compatibility. The SFS37T40K291B-F operates within the SF series with marginally reduced height (3.030" versus 3.250") and lead spacing of 0.810" (20.57mm), which remains compatible with standard radial can mounting brackets.

For Legacy System Maintenance:

The SFS37S40K288B provides an active alternative for applications where RoHS compliance is not mandated. This part maintains full electrical equivalence and operates within the SF series with compatible mechanical dimensions.

Compliance Considerations:

The original 23FD3740 is RoHS non-compliant. Substitution with 23FD3740A-F or SFS37T40K291B-F addresses regulatory compliance requirements while maintaining functional equivalence. The SFS37S40K288B does not provide compliance improvement but offers active product status for continued availability.

Frequently Asked Questions (FAQ)

Q: Can the 23FD3740A-F directly replace the obsolete 23FD3740?

A: Yes. The 23FD3740A-F is electrically and mechanically equivalent. Both parts share identical capacitance (40 µF), voltage rating (370V AC), tolerance (±10%), dielectric material (polypropylene metallized), operating temperature range (-40°C to 70°C), and lead spacing (0.813"). The primary difference is product status (active versus obsolete) and RoHS compliance (ROHS3 compliant versus non-compliant).

Q: What are the dimensional differences between substitute parts?

A: The 23FD3740A-F maintains the original diameter (2.125") and lead spacing (0.813"). The SF series parts (SFS37S40K288B and SFS37T40K291B-F) have slightly reduced diameter (2.120") and lead spacing (0.810"), with heights ranging from 3.000" to 3.030" compared to the original 3.250". These variations remain within standard radial can mounting tolerances and do not affect compatibility with typical holder/bracket assemblies.

Q: Are all substitute parts suitable for motor run and power factor correction applications?

A: Yes. All substitute parts are rated for motor run and power factor correction applications. The 23FD3740A-F explicitly lists both applications. The SF series parts (SFS37S40K288B and SFS37T40K291B-F) are rated for motor run applications and maintain equivalent electrical characteristics for power factor correction use.

Q: What is the significance of RoHS compliance in selecting a substitute?

A: RoHS compliance indicates conformance to the Restriction of Hazardous Substances directive. The 23FD3740A-F and SFS37T40K291B-F are ROHS3 compliant, making them suitable for applications subject to regulatory requirements. The original 23FD3740 and SFS37S40K288B are non-compliant and should be selected only when regulatory exemptions apply or legacy system constraints require exact historical matching.

Q: Can the SFS37S40K288B or SFS37T40K291B-F be used interchangeably with the 23FD3740A-F?

A: Yes, within mechanical tolerance limits. All three parts meet electrical equivalence requirements. The SF series parts have marginally different dimensions (2.120" diameter, 0.810" lead spacing, reduced height) compared to the MPF series 23FD3740A-F (2.125" diameter, 0.813" lead spacing). Standard radial can mounting brackets accommodate these variations. Selection should be based on RoHS compliance requirements and specific mounting bracket specifications.

Q: What is the moisture sensitivity level (MSL) significance?

A: The 23FD3740 and 23FD3740A-F have MSL rating of 1 (Unlimited), indicating no moisture sensitivity restrictions during storage or handling. The SF series parts (SFS37S40K288B and SFS37T40K291B-F) have MSL rating of Not Applicable, indicating these parameters do not apply to film capacitor construction. Both ratings are equivalent for practical application purposes.

Q: Are all substitute parts available in bulk packaging?

A: The 23FD3740A-F and SFS37T40K291B-F are available in bulk packaging. The SFS37S40K288B packaging specification is not provided in the technical data. Packaging requirements should be confirmed with the component supplier for specific procurement needs.

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