Equivalent & Substitute Parts for 21FB4420-F

Part Overview

The 21FB4420-F is a 20 µF film capacitor rated for 440V 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/disconnect termination.

The 21FB4420-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 capacitor specification is required.

Substiute Parts

21FB4420-F

Cornell Dubilier Electronics (CDE)In Stock: 87521FB4420-F Datasheet

Current PartRFQ

21FB4420A-F

Cornell Dubilier Electronics (CDE)In Stock: 113321FB4420A-F Datasheet

DirectRFQ

SFP44T20K284B-F

Cornell Dubilier Electronics (CDE)In Stock: 760SFP44T20K284B-F Datasheet

DirectRFQ

21FB4420

Cornell Dubilier Electronics (CDE)In Stock: 89621FB4420 Datasheet

Parametric EquivalentRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution eligibility for the 21FB4420-F is determined by strict equivalence across the following critical parameters:

Mandatory Matching Parameters:

• Capacitance: 20 µF
• Tolerance: ±10%
• Voltage Rating - AC: 440V
• Dielectric Material: Polypropylene (PP), Metallized
• Operating Temperature Range: -40°C ~ 70°C
• Mounting Type: Chassis Mount, Requires Holder/Bracket
• Package / Case: Radial, Can
• Termination: Quick Connect, Disconnect
• Applications: Motor Run and/or Power Factor Correction (PFC)

Allowable Variation Parameters:

• Physical dimensions (diameter, height, lead spacing) within mechanical compatibility constraints
• Series designation (MPF, SF)
• Product status (obsolete to active transition acceptable)
• Packaging format (bulk vs. standard)
• RoHS compliance status (ROHS3 Compliant acceptable; RoHS non-compliant acceptable for legacy applications)

All identified substitutes maintain identical electrical specifications and functional performance characteristics as the main part.

Parameter Comparison

Engineering Selection Recommendations

21FB4420A-F (Direct Manufacturer Equivalent - Recommended Primary Substitute)

The 21FB4420A-F is the preferred substitute for the obsolete 21FB4420-F. Both parts are manufactured by Cornell Dubilier Electronics in the MPF series and maintain identical electrical specifications. The 21FB4420A-F is classified as active product status, ensuring long-term availability. Physical dimensions are nearly identical with only a 0.160" (4.06mm) reduction in seated height (3.090" vs. 3.250"), which remains compatible with standard chassis mount applications. Both parts are ROHS3 compliant and feature unlimited moisture sensitivity rating. Inventory availability is higher for the 21FB4420A-F (1095 units vs. 813 units).

SFP44T20K284B-F (Series Variant - Secondary Substitute)

The SFP44T20K284B-F is an active product from the SF series that meets all mandatory electrical parameters. This part features a more compact profile with seated height of 2.960" (75.18mm), representing a 0.290" (7.37mm) reduction compared to the main part. Diameter and lead spacing remain within acceptable mechanical tolerance. The SFP44T20K284B-F is ROHS3 compliant. This variant is suitable for applications where reduced vertical clearance is beneficial or required.

21FB4420 (Parametric Equivalent - Legacy Option)

The 21FB4420 is an active product in the MPF series with identical electrical specifications and physical dimensions to the main part. However, this part is classified as RoHS non-compliant, making it unsuitable for applications requiring RoHS3 compliance. Selection of this part should be limited to legacy systems or applications where RoHS compliance is not mandated.

Frequently Asked Questions (FAQ)

Q: Can the 21FB4420A-F be used as a direct replacement for the 21FB4420-F?

A: Yes. The 21FB4420A-F is a direct manufacturer equivalent with identical electrical specifications (20 µF, ±10%, 440V AC, polypropylene metallized dielectric). Both parts are ROHS3 compliant and feature the same operating temperature range, termination type, and lead spacing. The 21FB4420A-F has a slightly reduced seated height (3.090" vs. 3.250"), which is compatible with standard chassis mount applications.

Q: What is the difference between the 21FB4420A-F and SFP44T20K284B-F?

A: Both parts are electrically equivalent 20 µF, 440V AC film capacitors with polypropylene metallized dielectric. The primary differences are series designation (MPF vs. SF) and physical dimensions. The SFP44T20K284B-F has a more compact profile with seated height of 2.960" compared to 3.090" for the 21FB4420A-F. Both are ROHS3 compliant and active products.

Q: Is the 21FB4420 suitable as a substitute?

A: The 21FB4420 meets all electrical and mechanical specifications of the main part. However, it is classified as RoHS non-compliant. Selection of this part is appropriate only for legacy applications or systems where RoHS compliance is not required.

Q: What are the critical parameters that determine substitution eligibility?

A: Substitution eligibility is determined by matching capacitance (20 µF), tolerance (±10%), voltage rating (440V AC), dielectric material (polypropylene metallized), operating temperature range (-40°C ~ 70°C), mounting type (chassis mount with holder/bracket), package style (radial can), and termination type (quick connect/disconnect). Physical dimensions may vary within mechanical compatibility constraints.

Q: Are all substitute parts available in the same packaging format?

A: The 21FB4420-F and 21FB4420 are supplied in standard packaging, while the 21FB4420A-F and SFP44T20K284B-F are supplied in bulk packaging. Packaging format does not affect electrical or mechanical compatibility.

Q: Which substitute part has the best inventory availability?

A: The 21FB4420A-F has the highest inventory availability with 1095 units in stock, compared to 813 units for the main part, 791 units for the 21FB4420, and 719 units for the SFP44T20K284B-F.