Equivalent & Substitute Parts for 21FD37125-F Film Capacitor

Part Overview

The Cornell Dubilier Electronics (CDE) 21FD37125-F is a 12.5 µF film capacitor rated for 370V AC operation with polypropylene metallized dielectric construction. This component is classified as obsolete, necessitating identification of active equivalent alternatives for continued system support and procurement. The part is designed for motor run and power factor correction applications requiring radial can-style packaging with quick connect termination.

Substiute Parts

21FD37125-F

Cornell Dubilier Electronics (CDE)In Stock: 118021FD37125-F Datasheet

Current PartRFQ

21FD37125A-F

Cornell Dubilier Electronics (CDE)In Stock: 92621FD37125A-F Datasheet

DirectRFQ

SFP37T12.5K238B-F

Cornell Dubilier Electronics (CDE)In Stock: 1038SFP37T12.5K238B-F Datasheet

DirectRFQ

SFP44T12.5K238B-F

Cornell Dubilier Electronics (CDE)In Stock: 740SFP44T12.5K238B-F Datasheet

DirectRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution eligibility for the 21FD37125-F is determined by strict equivalence across the following critical parameters:

Primary Equivalence Criteria:

• Capacitance value: 12.5 µF (exact match required)
• Tolerance: ±10% (exact match required)
• Dielectric material: Polypropylene (PP), Metallized (exact match required)
• Package type: Radial, Can (exact match required)
• Termination: Quick Connect, Disconnect (exact match required)
• Operating temperature range: -40°C to 70°C (exact match required)
• Mounting configuration: Chassis Mount, Requires Holder/Bracket (exact match required)

Secondary Compatibility Factors:

• Voltage rating: Equal to or greater than 370V AC
• Physical dimensions: Minor variations acceptable within mechanical envelope constraints
• Product status: Active status preferred for long-term availability

The substitute parts identified below satisfy all primary equivalence criteria. Voltage rating variations are noted where applicable, as higher voltage ratings provide backward compatibility for 370V applications.

Parameter Comparison

Engineering Selection Recommendations

21FD37125A-F (Direct Upgrade)

This part represents the direct active equivalent to the obsolete 21FD37125-F. It maintains identical electrical specifications (12.5 µF, ±10%, 370V AC) and mechanical compatibility (radial can package, quick connect termination, lead spacing 0.813"). The primary difference is reduced seated height (2.630" versus 2.880"), which provides improved mechanical fit in space-constrained applications. Product status is active, ensuring long-term availability and supply chain continuity. ROHS3 compliance and REACH unaffected status confirm regulatory alignment.

SFP37T12.5K238B-F (Series Alternative)

This part belongs to the SF series and provides electrical equivalence with identical capacitance, tolerance, and voltage rating. Physical dimensions are nearly identical (1.870" diameter versus 1.875", lead spacing 0.810" versus 0.813"). Seated height is reduced to 2.500", offering the most compact profile among available substitutes. Active product status and bulk packaging availability support high-volume procurement. This part is suitable for applications where reduced height is beneficial or required.

SFP44T12.5K238B-F (Higher Voltage Alternative)

This part provides the same capacitance and tolerance with elevated voltage rating (440V AC versus 370V AC). The higher voltage rating enables operation in systems with voltage transients or future upgrades to higher-voltage equipment. Physical dimensions and height match the SFP37T12.5K238B-F. Active product status and bulk packaging support procurement flexibility. This part is appropriate for applications requiring voltage margin or compatibility with 440V motor systems.

All three substitute parts maintain ROHS3 compliance and are manufactured by Cornell Dubilier Electronics, ensuring consistent quality and reliability standards.

Frequently Asked Questions (FAQ)

Q: Can 21FD37125A-F directly replace 21FD37125-F in existing assemblies?

A: Yes. The 21FD37125A-F provides direct electrical and mechanical equivalence. The reduced seated height (2.630" versus 2.880") is compatible with standard chassis mount configurations. Lead spacing (0.813") and termination style (quick connect/disconnect) are identical. No circuit modifications are required.

Q: What is the difference between the three substitute parts?

A: All three parts share identical capacitance (12.5 µF), tolerance (±10%), dielectric material (polypropylene metallized), and operating temperature range (-40°C to 70°C). The 21FD37125A-F maintains the original 370V rating with minimal height reduction. The SFP37T12.5K238B-F and SFP44T12.5K238B-F belong to the SF series with further height reduction (2.500") and slightly reduced diameter (1.870" versus 1.875"). The SFP44T12.5K238B-F provides 440V rating instead of 370V.

Q: Can SFP44T12.5K238B-F be used in a 370V application?

A: Yes. The 440V rating provides backward compatibility with 370V systems. Higher voltage ratings do not degrade performance in lower-voltage applications. This part is suitable for systems with voltage transients or future upgrades.

Q: Are there mechanical fit considerations when substituting?

A: Minor dimensional variations exist. The 21FD37125A-F maintains the original diameter (1.875") and lead spacing (0.813"). The SFP series parts have slightly reduced diameter (1.870") and lead spacing (0.810"), which are negligible differences. All parts require chassis mount holders/brackets. Verify mechanical envelope clearance in space-constrained applications, particularly regarding the reduced seated heights of SFP series parts (2.500" versus 2.880" original).

Q: What is the inventory status for each substitute?

A: 21FD37125A-F: 859 pcs in stock. SFP37T12.5K238B-F: 1025 pcs in stock. SFP44T12.5K238B-F: 696 pcs in stock. All parts are new original stock with active product status.

Q: Are all substitute parts RoHS compliant?

A: Yes. All three substitute parts are ROHS3 compliant. The 21FD37125A-F and SFP series parts carry REACH unaffected status, confirming regulatory compliance for EU and international markets.

Q: What applications are these capacitors suitable for?

A: All parts are rated for motor run and power factor correction (PFC) applications. The 12.5 µF capacitance and 370V/440V ratings are standard for three-phase motor run capacitors and industrial power factor correction circuits.