Equivalent & Substitute Parts for 37FD37125A-F

Part Overview

The 37FD37125A-F is a 12.5 µF film capacitor manufactured by Cornell Dubilier Electronics (CDE) from the MPF series. This polypropylene metallized radial capacitor is rated for 370V AC operation and is designed for motor run and power factor correction (PFC) applications. The part is currently active in production with 1017 units in stock. Substitute parts are identified when equivalent electrical and mechanical parameters allow direct replacement in the same application circuit, maintaining performance and reliability standards.

Key Parameters

Parameter	Value	Significance for Substitution
Capacitance	12.5 µF	Must match exactly for circuit function
Tolerance	±10%	Must match or be tighter for performance consistency
Voltage Rating - AC	370V	Minimum requirement; higher ratings acceptable
Dielectric Material	Polypropylene (PP), Metallized	Must match for electrical characteristics and reliability
Operating Temperature Range	-40°C ~ 70°C	Must meet or exceed application requirements
Package / Case	Radial, Can	Must match for mechanical fit and mounting
Size / Dimension	2.906" L x 1.906" W (73.81mm x 48.41mm)	Must match for chassis mount compatibility
Lead Spacing	0.813" (20.64mm)	Must match for PCB or terminal board compatibility
Termination	Quick Connect, Disconnect	Must match for connection method
RoHS Status	ROHS3 Compliant	Required for regulatory compliance

Substitute Part Grouping Explanation

The 37FB44125A-F is identified as a parametric equivalent to the 37FD37125A-F based on the following substitution criteria:

Matching Parameters:

Capacitance: 12.5 µF (identical)
Tolerance: ±10% (identical)
Dielectric Material: Polypropylene (PP), Metallized (identical)
Operating Temperature Range: -40°C ~ 70°C (identical)
Package / Case: Radial, Can (identical)
Size / Dimension: 2.906" L x 1.906" W / 73.81mm x 48.41mm (identical)
Lead Spacing: 0.813" (20.64mm) (identical)
Termination: Quick Connect, Disconnect (identical)
Series: MPF (identical)
RoHS Status: ROHS3 Compliant (identical)
Moisture Sensitivity Level: 1 (Unlimited) (identical)

Differing Parameter:

Voltage Rating - AC: 37FB44125A-F rated at 440V versus 37FD37125A-F rated at 370V

The 37FB44125A-F operates at a higher AC voltage rating (440V), which exceeds the 370V requirement of the main part. In applications where the circuit voltage does not exceed 370V AC, the higher voltage-rated substitute part provides equivalent or superior performance without derating. Both parts share identical mechanical dimensions, lead spacing, and mounting requirements, ensuring direct physical compatibility.

Parameter Comparison

Parameter	37FD37125A-F (Main Part)	37FB44125A-F (Substitute)	Compatibility
Manufacturer	Cornell Dubilier Electronics (CDE)	Cornell Dubilier Electronics (CDE)	Identical
Series	MPF	MPF	Identical
Capacitance	12.5 µF	12.5 µF	Identical
Tolerance	±10%	±10%	Identical
Voltage Rating - AC	370V	440V	Substitute rated higher
Dielectric Material	Polypropylene (PP), Metallized	Polypropylene (PP), Metallized	Identical
Operating Temperature	-40°C ~ 70°C	-40°C ~ 70°C	Identical
Package / Case	Radial, Can	Radial, Can	Identical
Size / Dimension	2.906" L x 1.906" W (73.81mm x 48.41mm)	2.906" L x 1.906" W (73.81mm x 48.41mm)	Identical
Height - Seated (Max)	2.630" (66.80mm)	2.630" (66.80mm)	Identical
Lead Spacing	0.813" (20.64mm)	0.813" (20.64mm)	Identical
Termination	Quick Connect, Disconnect	Quick Connect, Disconnect	Identical
Mounting Type	Chassis Mount, Requires Holder/Bracket	Chassis Mount, Requires Holder/Bracket	Identical
Applications	Motor Run; Power Factor Correction (PFC)	Motor Run; Power Factor Correction (PFC)	Identical
RoHS Status	ROHS3 Compliant	ROHS3 Compliant	Identical
Product Status	Active	Active	Both in production

Engineering Selection Recommendations

Primary Selection (37FD37125A-F): Use the 37FD37125A-F when the application circuit is designed specifically for 370V AC operation and component procurement prioritizes exact voltage rating matching. This part is ROHS3 compliant and actively produced by CDE.

Substitute Selection (37FB44125A-F): The 37FB44125A-F is suitable for replacement in circuits where the operating voltage does not exceed 370V AC. The higher 440V AC rating provides additional voltage margin without affecting capacitance, tolerance, temperature performance, or mechanical compatibility. Both parts are ROHS3 compliant and actively produced. The substitute part has higher inventory availability (1203 units versus 1017 units).

Selection Criteria:

Verify circuit maximum AC voltage does not exceed 370V
Confirm mechanical space accommodates identical 2.906" L x 1.906" W dimensions
Ensure quick connect/disconnect termination is compatible with existing terminal board or PCB
Both parts operate across -40°C to 70°C temperature range

Frequently Asked Questions (FAQ)

Q: Can the 37FB44125A-F replace the 37FD37125A-F in all applications?

A: The 37FB44125A-F is suitable for replacement when the circuit maximum AC voltage does not exceed 370V. The higher 440V rating of the substitute part does not create incompatibility in lower voltage circuits. Verify the application voltage specification before substitution.

Q: What is the difference between these two parts?

A: The primary difference is the AC voltage rating: 37FD37125A-F is rated 370V AC, while 37FB44125A-F is rated 440V AC. All other electrical parameters (capacitance, tolerance, dielectric material, temperature range) and mechanical parameters (dimensions, lead spacing, termination type) are identical.

Q: Are the physical dimensions identical?

A: Yes. Both parts have identical dimensions of 2.906" L x 1.906" W (73.81mm x 48.41mm) with a maximum seated height of 2.630" (66.80mm) and lead spacing of 0.813" (20.64mm). They are mechanically interchangeable in chassis mount applications requiring a holder or bracket.

Q: Do both parts meet the same compliance standards?

A: Yes. Both the 37FD37125A-F and 37FB44125A-F are ROHS3 compliant, have MSL rating of 1 (Unlimited), and are REACH unaffected. Both are classified under ECCN EAR99 and HTSUS 8532.25.0020.

Q: What applications are these capacitors designed for?

A: Both parts are designed for motor run and power factor correction (PFC) applications. They use polypropylene metallized dielectric material suitable for these industrial and commercial applications.

Q: Is the ±10% tolerance the same for both parts?

A: Yes. Both the 37FD37125A-F and 37FB44125A-F have ±10% capacitance tolerance, ensuring consistent performance in circuits designed for this tolerance specification.

Q: What is the operating temperature range?

A: Both parts operate across -40°C to 70°C, providing performance across standard industrial temperature ranges.

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