Equivalent & Substitute Parts for Cornell Dubilier Electronics 21FD3708-F

Part Overview

The Cornell Dubilier Electronics 21FD3708-F is an 8 µF film capacitor rated for 370V AC, utilizing polypropylene (PP) metallized dielectric in a radial, can package configuration. This component is designed for motor run and power factor correction (PFC) applications requiring chassis mount installation with holder/bracket support.

The 21FD3708-F carries an Obsolete product status. Identification of active equivalent parts ensures continued design support and procurement availability for applications requiring this specific capacitance, voltage, and package type.

Substiute Parts

21FD3708-F

Cornell Dubilier Electronics (CDE)In Stock: 111921FD3708-F Datasheet

Current PartRFQ

21FD3708A-F

Cornell Dubilier Electronics (CDE)In Stock: 79821FD3708A-F Datasheet

DirectRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution for the 21FD3708-F is based on electrical and mechanical parameter equivalency across the following criteria:

Electrical Parameters: Capacitance value (8 µF), tolerance (±10%), AC voltage rating (370V), and dielectric material (Polypropylene, Metallized) must remain identical to ensure functional compatibility within motor run and PFC circuits.

Mechanical Parameters: Package type (Radial, Can), diameter (1.875" / 47.63mm), lead spacing (0.813" / 20.64mm), and termination style (Quick Connect, Disconnect) must match to ensure physical fit within chassis-mounted applications.

Environmental Parameters: Operating temperature range (-40°C ~ 70°C), RoHS compliance (ROHS3), and moisture sensitivity level (MSL 1 - Unlimited) establish regulatory and reliability baseline requirements.

The substitute part 21FD3708A-F meets all these criteria with minor physical dimension variance in maximum seated height.

Parameter Comparison

Engineering Selection Recommendations

The 21FD3708A-F serves as the direct active equivalent for the obsolete 21FD3708-F. Both components maintain identical electrical specifications (8 µF capacitance, ±10% tolerance, 370V AC rating) and share the same polypropylene metallized dielectric construction, ensuring functional equivalency in motor run and PFC applications.

The primary distinction is product lifecycle status: the 21FD3708-F is classified as Obsolete, while the 21FD3708A-F maintains Active status within Cornell Dubilier Electronics' product lineup. The 21FD3708A-F additionally carries REACH Unaffected certification, which provides expanded regulatory compliance documentation.

Both components satisfy ROHS3 compliance and maintain identical MSL ratings (1 - Unlimited), confirming equivalent environmental and reliability characteristics. The minor reduction in maximum seated height (2.630" versus 2.880") on the 21FD3708A-F represents improved packaging density and does not affect chassis mount compatibility or electrical performance.

Frequently Asked Questions (FAQ)

Q: Is the 21FD3708A-F electrically compatible with the 21FD3708-F?

A: Yes. Both components are identical in capacitance (8 µF), tolerance (±10%), voltage rating (370V AC), and dielectric material (Polypropylene, Metallized). Electrical characteristics within motor run and power factor correction circuits remain unchanged.

Q: Will the 21FD3708A-F fit in existing chassis mounts designed for the 21FD3708-F?

A: Yes. Both components share identical diameter (1.875" / 47.63mm), lead spacing (0.813" / 20.64mm), mounting type (Chassis Mount, Requires Holder/Bracket), and termination style (Quick Connect, Disconnect). The 21FD3708A-F has a reduced maximum seated height (2.630" versus 2.880"), which does not compromise mechanical compatibility.

Q: What is the significance of the obsolete versus active product status?

A: The 21FD3708-F is classified as Obsolete, indicating it is no longer actively manufactured or supported by Cornell Dubilier Electronics. The 21FD3708A-F carries Active status and represents the current production equivalent, ensuring ongoing availability, documentation support, and warranty coverage.

Q: Are there compliance differences between these two components?

A: Both components are ROHS3 Compliant and carry identical MSL ratings (1 - Unlimited). The 21FD3708A-F includes additional REACH Unaffected certification. Both share the same ECCN (EAR99) and HTSUS (8532.25.0020) classifications.

Q: Can the 21FD3708A-F be used as a drop-in replacement in production assemblies?

A: Yes. Identical electrical parameters, mechanical dimensions (except reduced height), lead spacing, and termination type enable direct substitution within assemblies designed for the 21FD3708-F. The reduced seated height may provide assembly benefits without introducing compatibility concerns.