Equivalent & Substitute Parts for Cornell Dubilier Electronics 21FD3725

Part Overview

The Cornell Dubilier Electronics 21FD3725 is a 25 µF film capacitor rated for 370V AC operation, utilizing polypropylene (PP) metallized dielectric technology in a radial, can-style package. This component is designed for motor run and power factor correction (PFC) applications requiring chassis mount installation with holder/bracket support. The part maintains Active product status with 1085 units in current inventory. Substitute parts are identified to address packaging variations, compliance requirements, and dimensional specifications while maintaining electrical equivalence.

Substiute Parts

21FD3725

Cornell Dubilier Electronics (CDE)In Stock: 116021FD3725 Datasheet

Current PartRFQ

21FD3725A-F

Cornell Dubilier Electronics (CDE)In Stock: 91021FD3725A-F Datasheet

DirectRFQ

SFP37T25K284B-F

Cornell Dubilier Electronics (CDE)In Stock: 1139SFP37T25K284B-F Datasheet

DirectRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution eligibility for the 21FD3725 is determined by strict electrical and mechanical parameter matching:

Electrical Equivalence Criteria:

• Capacitance: 25 µF (exact match required)
• Tolerance: ±10% (exact match required)
• Voltage Rating (AC): 370V (exact match required)
• Dielectric Material: Polypropylene (PP), Metallized (exact match required)
• Operating Temperature Range: -40°C to 70°C (exact match required)

Mechanical Compatibility Criteria:

• Package Type: Radial, Can (exact match required)
• Mounting Type: Chassis Mount, Requires Holder/Bracket (exact match required)
• Termination: Quick Connect, Disconnect (exact match required)
• Lead Spacing: 0.813" ±0.003" (20.64mm nominal, minor variations acceptable)

Identified Substitutes:

1. 21FD3725A-F (Cornell Dubilier Electronics, MPF Series): Meets all electrical and mechanical parameters. Height variation: 3.090" vs. 3.250" (within chassis mount tolerance). Packaging: Bulk. RoHS3 Compliant.

2. SFP37T25K284B-F (Cornell Dubilier Electronics, SF Series): Meets all electrical and mechanical parameters. Dimensional variations: 1.870" Dia (vs. 1.875"), Height 3.000" (vs. 3.250"), Lead Spacing 0.810" (vs. 0.813"). RoHS3 Compliant.

Parameter Comparison

Engineering Selection Recommendations

21FD3725A-F Selection Criteria:

• Same MPF series as main part, ensuring design continuity
• Identical electrical specifications and lead spacing
• Height reduction of 0.160" (4.06mm) accommodates space-constrained chassis designs
• RoHS3 compliance addresses regulatory requirements for new designs
• Bulk packaging suitable for production environments

SFP37T25K284B-F Selection Criteria:

• SF series alternative with equivalent electrical performance
• Compact profile: 0.250" (6.35mm) height reduction from main part
• Minimal dimensional variance (0.003" diameter, 0.003" lead spacing) within standard mechanical tolerances
• RoHS3 compliance and highest current inventory (1105 units)
• Suitable for retrofit applications with space constraints

Compliance Considerations: Both substitute parts achieve RoHS3 compliance, whereas the main part 21FD3725 is RoHS non-compliant. Selection between substitutes depends on design phase: new designs should prioritize compliant alternatives; legacy system maintenance may require the original part.

Frequently Asked Questions (FAQ)

Q: Can 21FD3725A-F directly replace 21FD3725 in existing assemblies?

A: Yes. Both parts share identical electrical specifications (25 µF, ±10%, 370V AC, PP metallized dielectric) and mechanical mounting requirements (chassis mount, quick connect termination, 0.813" lead spacing). The 0.160" height reduction in 21FD3725A-F is accommodated within standard chassis mount bracket tolerances. Verify available vertical clearance in the specific application before substitution.

Q: What are the dimensional implications of using SFP37T25K284B-F?

A: SFP37T25K284B-F introduces three dimensional variations: diameter reduced by 0.005" (0.13mm), height reduced by 0.250" (6.35mm), and lead spacing reduced by 0.003" (0.07mm). These variations remain within standard mechanical tolerances for chassis mount applications. Confirm bracket compatibility and lead hole spacing before implementation.

Q: Are there electrical performance differences between the three parts?

A: No. All three parts maintain identical electrical specifications: 25 µF capacitance, ±10% tolerance, 370V AC rating, polypropylene metallized dielectric, and -40°C to 70°C operating temperature range. Electrical performance in motor run and power factor correction applications is equivalent.

Q: Which substitute should be selected for new product designs?

A: For new designs, either 21FD3725A-F or SFP37T25K284B-F is appropriate, as both achieve RoHS3 compliance. Selection depends on available chassis space: 21FD3725A-F for standard installations, SFP37T25K284B-F for space-constrained designs. The main part 21FD3725 (RoHS non-compliant) is not recommended for new designs subject to RoHS regulations.

Q: What is the impact of packaging differences (standard vs. bulk)?

A: The main part 21FD3725 uses standard packaging; both substitutes use bulk packaging. Bulk packaging reduces per-unit cost in production environments but may not be suitable for small-quantity orders or individual component procurement. Verify packaging requirements with procurement specifications.

Q: Are lead spacing variations critical for PCB or bracket design?

A: Lead spacing variations are minimal (0.003" maximum between parts). Standard chassis mount brackets accommodate this tolerance range. However, if the application uses precision-drilled mounting brackets with tight tolerances, verify bracket specifications before substitution.

Q: Can these parts be used interchangeably in motor run applications?

A: Yes. All three parts are rated for motor run applications with identical electrical specifications and operating temperature ranges. Mechanical mounting differences do not affect motor run performance; only chassis space availability and bracket compatibility require verification.