Equivalent & Substitute Parts for Cornell Dubilier Electronics 21FD3735

Part Overview

The Cornell Dubilier Electronics 21FD3735 is a 35 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 is currently in active production status with 773 units available in inventory.

Substitute parts are necessary when the primary part becomes unavailable, when alternative compliance certifications are required, or when inventory constraints necessitate sourcing from alternative manufacturers while maintaining equivalent electrical and mechanical performance.

Key Parameters

Parameter	Value	Significance for Substitution
Capacitance	35 µF	Core electrical specification; must match exactly
Voltage Rating (AC)	370V	Core electrical specification; must match exactly
Tolerance	±10%	Acceptable variation range; must match or be tighter
Dielectric Material	Polypropylene (PP), Metallized	Determines electrical characteristics and reliability
Package Type	Radial, Can	Physical form factor; must be compatible with mounting
Mounting Type	Chassis Mount, Requires Holder/Bracket	Installation method; affects mechanical compatibility
Termination	Quick Connect, Disconnect	Electrical connection method; must be compatible
Operating Temperature Range	-40°C ~ 70°C	Environmental operating limits; substitute must meet or exceed

Substitute Part Grouping Explanation

Substitution eligibility for the 21FD3735 is determined by strict equivalence across the following critical parameters:

Electrical Equivalence Requirements:

Capacitance value: 35 µF (exact match required)
Voltage rating: 370V AC (exact match required)
Tolerance: ±10% (substitute tolerance must be equal or tighter)
Dielectric material: Polypropylene (PP), Metallized (exact match required)

Mechanical Compatibility Requirements:

Package type: Radial, Can configuration
Mounting method: Chassis Mount with Holder/Bracket support
Termination style: Quick Connect, Disconnect

Environmental Compatibility:

Operating temperature range of substitute must encompass or exceed the application requirements within the -40°C to 70°C envelope

The substitute part DS371356-CA from Panasonic Electronic Components meets all electrical equivalence criteria and mechanical compatibility requirements, though with noted differences in physical dimensions and product status.

Parameter Comparison

Parameter	21FD3735 (Cornell Dubilier)	DS371356-CA (Panasonic)	Match Status
Capacitance	35 µF	35 µF	Equivalent
Voltage Rating (AC)	370V	370V	Equivalent
Tolerance	±10%	±10%	Equivalent
Dielectric Material	Polypropylene (PP), Metallized	Polypropylene (PP), Metallized	Equivalent
Package Type	Radial, Can	Radial, Can	Equivalent
Mounting Type	Chassis Mount, Requires Holder/Bracket	Chassis Mount, Requires Holder/Bracket	Equivalent
Termination	Quick Connect, Disconnect	Quick Connect, Disconnect	Equivalent
Operating Temperature Range	-40°C ~ 70°C	-25°C ~ 70°C	Substitute range narrower at low end
Diameter	1.875" (47.63mm)	1.772" (45.00mm)	Physically different
Height (Seated Max)	4.000" (101.60mm)	4.016" (102.00mm)	Physically similar
Lead Spacing	0.813" (20.64mm)	0.709" (18.00mm)	Physically different
Product Status	Active	Obsolete	Different lifecycle status
RoHS Compliance	RoHS non-compliant	ROHS3 Compliant	Different compliance status

Engineering Selection Recommendations

Primary Part Selection (21FD3735): The Cornell Dubilier Electronics 21FD3735 remains the preferred selection for new designs and applications where RoHS non-compliance is acceptable. This part is in active production status with established inventory availability (773 units in stock), ensuring supply chain continuity and consistent performance characteristics.

Substitute Part Selection (DS371356-CA): The Panasonic DS371356-CA is electrically and functionally equivalent across all core parameters (capacitance, voltage rating, tolerance, dielectric material, and termination type). However, the following factors must be evaluated before substitution:

Product Status: The DS371356-CA is classified as obsolete, indicating discontinued production. Substitution should only occur when primary part availability is exhausted or when long-term supply assurance is required from alternative sources.
Compliance Certification: The DS371356-CA carries ROHS3 compliance certification, whereas the 21FD3735 is RoHS non-compliant. Selection between these parts depends on regulatory requirements applicable to the end application and target market.
Physical Dimensions: The DS371356-CA exhibits reduced diameter (1.772" vs. 1.875") and different lead spacing (0.709" vs. 0.813"). Physical mounting compatibility must be verified against the specific holder/bracket configuration and PCB layout constraints before substitution.
Operating Temperature Range: The DS371356-CA operates within -25°C to 70°C, which is narrower than the 21FD3735 range (-40°C to 70°C). Applications requiring operation below -25°C must retain the primary part.

Frequently Asked Questions (FAQ)

Q: Can the Panasonic DS371356-CA be directly substituted for the Cornell Dubilier 21FD3735 in existing designs?

A: Electrical substitution is valid based on matching capacitance (35 µF), voltage rating (370V AC), tolerance (±10%), and dielectric material (PP, metallized). However, mechanical compatibility must be verified. The reduced diameter (1.772" vs. 1.875") and different lead spacing (0.709" vs. 0.813") require confirmation that the existing holder/bracket assembly can accommodate the substitute part's physical dimensions.

Q: What is the significance of the product status difference between these parts?

A: The 21FD3735 is in active production, ensuring ongoing availability and consistent manufacturing. The DS371356-CA is obsolete, meaning production has been discontinued. Substitution to an obsolete part should only occur when the primary part is unavailable or when compliance requirements mandate the change.

Q: Does the operating temperature range difference affect substitution suitability?

A: The DS371356-CA operates from -25°C to 70°C, compared to the 21FD3735 range of -40°C to 70°C. If the application requires operation below -25°C, the substitute part is not suitable. For applications within the -25°C to 70°C envelope, the substitute is acceptable from a thermal perspective.

Q: How do the RoHS compliance differences impact part selection?

A: The 21FD3735 is RoHS non-compliant, while the DS371356-CA is ROHS3 compliant. Selection depends on regulatory requirements for the end product. Applications destined for markets with RoHS mandates must use the DS371356-CA or equivalent compliant alternatives. Applications without RoHS requirements can use either part.

Q: Are there any electrical performance differences between these capacitors?

A: No. Both parts are specified with identical capacitance (35 µF), voltage rating (370V AC), tolerance (±10%), and dielectric material (PP, metallized). Electrical performance in motor run and power factor correction applications is equivalent.

Q: What mounting considerations apply when substituting these parts?

A: Both parts require chassis mount installation with holder/bracket support and utilize quick connect/disconnect termination. The physical dimension differences (diameter and lead spacing) necessitate verification that the existing mechanical mounting assembly is compatible with the substitute part's form factor before installation.

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