Equivalent & Substitute Parts for 21FD3710-F

Part Overview

The 21FD3710-F is a 10 µF film capacitor rated for 370V AC operation, manufactured by Cornell Dubilier Electronics (CDE) in the MPF series. This component is designed for motor run and power factor correction (PFC) applications, featuring polypropylene metallized dielectric construction with radial, can-style packaging and quick connect termination.

The 21FD3710-F is classified as obsolete. Identifying equivalent and substitute parts is necessary to maintain circuit functionality and ensure continued availability for repair, maintenance, and new production applications where this component specification is required.

Key Parameters

Parameter	Value
Capacitance	10 µF
Voltage Rating - AC	370V
Tolerance	±10%
Dielectric Material	Polypropylene (PP), Metallized
Package / Case	Radial, Can
Mounting Type	Chassis Mount, Requires Holder/Bracket
Termination	Quick Connect, Disconnect
Operating Temperature Range	-40°C ~ 70°C
Applications	Motor Run; Power Factor Correction (PFC)
RoHS Status	ROHS3 Compliant

Substitute Part Grouping Explanation

Substitution eligibility for the 21FD3710-F is determined by the following critical parameters:

Primary Substitution Criteria:

Capacitance: 10 µF (exact match required)
Tolerance: ±10% (exact match required)
Dielectric Material: Polypropylene (PP), Metallized (exact match required)
Package / Case: Radial, Can (exact match required)
Termination: Quick Connect, Disconnect (exact match required)
Operating Temperature Range: -40°C ~ 70°C (exact match required)
Voltage Rating - AC: 370V or higher (equal or greater acceptable)

Secondary Compatibility Factors:

Mounting Type: Chassis Mount, Requires Holder/Bracket
Physical dimensions within acceptable tolerance for holder/bracket compatibility
RoHS3 compliance maintained

The substitute parts identified below meet all primary substitution criteria. Variations in physical dimensions (diameter and height) are acceptable provided the component fits within the existing holder/bracket assembly or equivalent mechanical mounting solution.

Parameter Comparison

Parameter	21FD3710-F (Main)	21FD3710A-F	SFP37T10K238B-F	SFP44T10K238B-F
Manufacturer	Cornell Dubilier Electronics (CDE)	Cornell Dubilier Electronics (CDE)	Cornell Dubilier Electronics (CDE)	Cornell Dubilier Electronics (CDE)
Capacitance	10 µF	10 µF	10 µF	10 µF
Tolerance	±10%	±10%	±10%	±10%
Voltage Rating - AC	370V	370V	370V	440V
Dielectric Material	Polypropylene (PP), Metallized	Polypropylene (PP), Metallized	Polypropylene (PP), Metallized	Polypropylene (PP), Metallized
Package / Case	Radial, Can	Radial, Can	Radial, Can	Radial, Can
Mounting Type	Chassis Mount, Requires Holder/Bracket	Chassis Mount, Requires Holder/Bracket	Chassis Mount, Requires Holder/Bracket	Chassis Mount, Requires Holder/Bracket
Termination	Quick Connect, Disconnect	Quick Connect, Disconnect	Quick Connect, Disconnect	Quick Connect, Disconnect
Operating Temperature Range	-40°C ~ 70°C	-40°C ~ 70°C	-40°C ~ 70°C	-40°C ~ 70°C
Size / Dimension (Diameter)	1.875" (47.63mm)	1.875" (47.63mm)	1.870" (47.50mm)	1.870" (47.50mm)
Height - Seated (Max)	2.880" (73.15mm)	2.630" (66.80mm)	2.500" (63.50mm)	2.500" (63.50mm)
Lead Spacing	0.813" (20.64mm)	0.813" (20.64mm)	0.810" (20.57mm)	0.810" (20.57mm)
Product Status	Obsolete	Active	Active	Active
Series	MPF	MPF	SF	SF
RoHS Status	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant

Engineering Selection Recommendations

21FD3710A-F (Recommended Primary Substitute)

The 21FD3710A-F is the direct successor within the same MPF series. This part maintains identical electrical specifications (10 µF, ±10%, 370V AC) and mechanical compatibility (radial can package, quick connect termination, identical lead spacing). The 21FD3710A-F is classified as Active product status, ensuring long-term availability. Physical dimensions are identical to the main part (1.875" diameter, 0.813" lead spacing), with a reduced seated height of 2.630" versus 2.880". This height reduction is compatible with standard holder/bracket assemblies designed for the 21FD3710-F. RoHS3 compliance is maintained. This part is the preferred direct replacement.

SFP37T10K238B-F (Secondary Substitute - Same Voltage Rating)

The SFP37T10K238B-F is an active product from the SF series with identical electrical specifications (10 µF, ±10%, 370V AC). Dielectric material, package type, termination, and operating temperature range are identical. Physical dimensions are nearly equivalent (1.870" diameter versus 1.875", 0.810" lead spacing versus 0.813", 2.500" seated height versus 2.880"). These minor dimensional variations are within acceptable tolerance for holder/bracket compatibility. RoHS3 compliance is maintained. This part is suitable for applications where the 21FD3710A-F is unavailable.

SFP44T10K238B-F (Tertiary Substitute - Higher Voltage Rating)

The SFP44T10K238B-F is an active product from the SF series with identical capacitance and tolerance (10 µF, ±10%) but elevated voltage rating (440V AC versus 370V AC). This higher voltage rating provides additional safety margin in motor run and PFC applications. All other electrical and mechanical specifications align with the main part. Physical dimensions are nearly equivalent to the SFP37T10K238B-F (1.870" diameter, 0.810" lead spacing, 2.500" seated height). RoHS3 compliance is maintained. This part is suitable for applications where enhanced voltage headroom is beneficial or required.

Frequently Asked Questions (FAQ)

Q: Can the 21FD3710A-F be used as a direct replacement for the 21FD3710-F?

A: Yes. The 21FD3710A-F is electrically and mechanically compatible with the 21FD3710-F. Both parts share identical capacitance (10 µF), tolerance (±10%), voltage rating (370V AC), dielectric material (polypropylene metallized), package type (radial can), termination style (quick connect), and lead spacing (0.813"). The seated height of the 21FD3710A-F is 2.630" compared to 2.880" for the main part; this reduction is compatible with standard holder/bracket assemblies.

Q: What is the difference between the SFP37T10K238B-F and SFP44T10K238B-F?

A: The primary difference is the voltage rating. The SFP37T10K238B-F is rated for 370V AC, matching the main part specification. The SFP44T10K238B-F is rated for 440V AC, providing a higher voltage margin. Both parts have identical capacitance (10 µF), tolerance (±10%), dielectric material, package type, and termination. The 440V rating makes the SFP44T10K238B-F suitable for applications requiring enhanced voltage headroom or for use in higher-voltage motor run circuits.

Q: Are there physical dimension differences between the substitute parts?

A: Yes. The main part 21FD3710-F has a diameter of 1.875" and seated height of 2.880". The 21FD3710A-F maintains the same diameter (1.875") but has a reduced seated height of 2.630". The SFP37T10K238B-F and SFP44T10K238B-F both have a diameter of 1.870" and seated height of 2.500". Lead spacing is 0.813" for the 21FD3710-F and 21FD3710A-F, and 0.810" for the SF series parts. These variations are within acceptable tolerance for holder/bracket compatibility.

Q: Can the SFP44T10K238B-F be used in a 370V AC circuit?

A: Yes. The SFP44T10K238B-F is rated for 440V AC, which exceeds the 370V AC requirement. A component rated for higher voltage can be used in lower-voltage applications without degradation of performance or reliability. The elevated voltage rating provides additional safety margin.

Q: Are all substitute parts RoHS3 compliant?

A: Yes. The 21FD3710A-F, SFP37T10K238B-F, and SFP44T10K238B-F are all ROHS3 compliant, matching the compliance status of the main part 21FD3710-F.

Q: What is the product status of each substitute part?

A: The 21FD3710-F is classified as Obsolete. The 21FD3710A-F, SFP37T10K238B-F, and SFP44T10K238B-F are all classified as Active, ensuring continued availability and long-term supply.

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