37FD37125 Film Capacitor - Equivalent & Substitute Parts

Part Overview

The 37FD37125 is a 12.5 µF film capacitor rated for 370V AC operation, manufactured by Cornell Dubilier Electronics (CDE) from the MPF series. This component is designed for motor run and power factor correction (PFC) applications in industrial equipment. The part carries an obsolete product status, making identification of active equivalent alternatives essential for procurement and system maintenance. Substitute parts must maintain identical capacitance and tolerance specifications while accommodating the electrical and mechanical constraints of the original application circuit.

Substiute Parts

37FD37125

Cornell Dubilier Electronics (CDE)In Stock: 75137FD37125 Datasheet

Current PartRFQ

37FB44125A-F

Cornell Dubilier Electronics (CDE)In Stock: 121537FB44125A-F Datasheet

DirectRFQ

37FD37125A-F

Cornell Dubilier Electronics (CDE)In Stock: 109937FD37125A-F Datasheet

DirectRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution eligibility for the 37FD37125 is determined by the following criteria:

Critical Parameters (Must Match):

• Capacitance: 12.5 µF
• Tolerance: ±10%
• Dielectric Material: Polypropylene (PP), Metallized
• Mounting Type: Chassis Mount, Requires Holder/Bracket
• Package / Case: Radial, Can
• Lead Spacing: 0.813" (20.64mm)
• Termination: Quick Connect, Disconnect
• Operating Temperature Range: -40°C to 70°C

Allowable Variation:

• Voltage Rating (AC): Equal to or greater than 370V

The substitute parts identified maintain all critical parameters. Voltage rating elevation above the original 370V specification is permissible, as higher-rated components operate safely in lower-voltage applications. Physical dimensions and termination compatibility ensure direct mechanical and electrical integration into existing circuit designs.

Parameter Comparison

Engineering Selection Recommendations

37FD37125A-F (Primary Substitute)

The 37FD37125A-F is the direct functional equivalent of the obsolete 37FD37125. This part maintains identical voltage rating (370V AC), capacitance (12.5 µF), and all mechanical specifications. The primary distinction is product status: 37FD37125A-F is active and carries ROHS3 compliance certification, addressing regulatory requirements for new equipment designs and system upgrades. The reduced seated height (2.630" versus 2.880") represents a minor dimensional improvement that does not affect circuit compatibility. This substitute is the preferred selection for applications requiring exact voltage matching and regulatory compliance.

37FB44125A-F (Secondary Substitute)

The 37FB44125A-F provides an elevated voltage rating of 440V AC while maintaining all other critical parameters. This part is suitable for applications where the original 370V specification can accommodate higher-rated components without circuit modification. The 440V rating provides additional safety margin in motor run and PFC applications. Like the primary substitute, this part is active and ROHS3 compliant. Selection of this part is appropriate when system voltage tolerance permits and when higher voltage margin is operationally beneficial.

Both substitute parts are manufactured by Cornell Dubilier Electronics from the MPF series, ensuring consistency with the original design intent and application requirements.

Frequently Asked Questions (FAQ)

Q: Can the 37FD37125A-F directly replace the obsolete 37FD37125?

A: Yes. The 37FD37125A-F maintains identical electrical specifications (12.5 µF, ±10%, 370V AC) and mechanical configuration (radial can, quick connect termination, 0.813" lead spacing). Both parts are from the MPF series. The primary difference is product status and regulatory compliance. The 37FD37125A-F is active and ROHS3 compliant.

Q: What is the difference between the 37FD37125A-F and 37FB44125A-F?

A: Both parts share identical capacitance (12.5 µF), tolerance (±10%), dielectric material (polypropylene metallized), and mechanical specifications. The 37FB44125A-F carries a higher AC voltage rating of 440V compared to the 370V rating of the 37FD37125A-F. Both are active, ROHS3 compliant, and suitable for motor run and PFC applications.

Q: Can I use the 37FB44125A-F (440V) in place of the 37FD37125 (370V)?

A: Yes. A higher voltage-rated capacitor operates safely in applications designed for lower voltage. The 37FB44125A-F can be used in any circuit originally specified for 370V operation. This substitution provides additional voltage margin without affecting circuit performance.

Q: Are there any physical dimension differences that affect mounting?

A: The seated height differs slightly: the original 37FD37125 measures 2.880" maximum, while both substitutes measure 2.630" maximum. This reduction does not create compatibility issues. All three parts maintain identical lead spacing (0.813"), footprint dimensions (2.906" L x 1.906" W), and quick connect termination, ensuring direct mechanical integration into existing chassis mount configurations.

Q: What is the significance of ROHS3 compliance on the substitute parts?

A: ROHS3 compliance indicates that the substitute parts meet current regulatory requirements for hazardous substance restrictions in electrical and electronic equipment. The original 37FD37125 is marked as RoHS non-compliant. For new equipment designs, system upgrades, or applications subject to regulatory oversight, the ROHS3-compliant substitutes (37FD37125A-F and 37FB44125A-F) are the appropriate selection.

Q: Do the substitute parts require different mounting hardware or brackets?

A: No. All three parts are specified as Chassis Mount, Requires Holder/Bracket with identical lead spacing and termination type (Quick Connect, Disconnect). Existing mounting infrastructure designed for the 37FD37125 accommodates both substitute parts without modification.

Q: What applications are these capacitors suitable for?

A: Both the main part and substitutes are rated for Motor Run and Power Factor Correction (PFC) applications. The polypropylene metallized dielectric and radial can configuration are standard for industrial motor capacitor applications operating at 370V or 440V AC.