Equivalent & Substitute Parts for 38FD3745-F Film Capacitor

Part Overview

The Cornell Dubilier Electronics (CDE) 38FD3745-F is a 45 µF film capacitor rated for 370V AC operation with polypropylene metallized dielectric construction. This component is designed for motor run and power factor correction (PFC) applications in industrial and commercial equipment. The part is classified as obsolete, making identification of compatible substitute components essential for maintenance, repair, and equipment servicing operations.

Key Parameters

Parameter	Value
Capacitance	45 µF
Tolerance	±10%
Voltage Rating (AC)	370V
Dielectric Material	Polypropylene (PP), Metallized
Operating Temperature Range	-40°C to 70°C
Mounting Type	Chassis Mount, Requires Holder/Bracket
Package Type	Radial, Can
Termination	Quick Connect, Disconnect
Lead Spacing	0.813" (20.64mm)
RoHS Status	ROHS3 Compliant

Substitute Part Grouping Explanation

Substitution of the 38FD3745-F is determined by strict equivalence across the following critical parameters:

Electrical Parameters (Non-Negotiable):

Capacitance value: 45 µF
Tolerance: ±10%
Voltage rating (AC): 370V
Dielectric type: Polypropylene (PP), Metallized

Mechanical Parameters (Non-Negotiable):

Package type: Radial, Can
Mounting configuration: Chassis Mount, Requires Holder/Bracket
Termination style: Quick Connect, Disconnect
Lead spacing: 0.813" (20.64mm)

Environmental & Compliance Parameters:

Operating temperature range: -40°C to 70°C
RoHS3 compliance

The substitute part 38FD3745A-F meets all electrical, mechanical, and compliance requirements for direct substitution. The primary distinction is product status: the original part is obsolete while the substitute is active in production.

Parameter Comparison

Parameter	38FD3745-F (Main Part)	38FD3745A-F (Substitute)	Match Status
Manufacturer	Cornell Dubilier Electronics (CDE)	Cornell Dubilier Electronics (CDE)	Identical
Series	MPF	MPF	Identical
Capacitance	45 µF	45 µF	Identical
Tolerance	±10%	±10%	Identical
Voltage Rating (AC)	370V	370V	Identical
Dielectric Material	Polypropylene (PP), Metallized	Polypropylene (PP), Metallized	Identical
Operating Temperature	-40°C to 70°C	-40°C to 70°C	Identical
Mounting Type	Chassis Mount, Requires Holder/Bracket	Chassis Mount, Requires Holder/Bracket	Identical
Package Type	Radial, Can	Radial, Can	Identical
Termination	Quick Connect, Disconnect	Quick Connect, Disconnect	Identical
Lead Spacing	0.813" (20.64mm)	0.813" (20.64mm)	Identical
Size/Dimension	3.654" L x 1.969" W (92.81mm x 50.01mm)	3.654" L x 1.969" W (92.81mm x 50.01mm)	Identical
Height - Seated (Max)	3.250" (82.55mm)	3.160" (80.26mm)	Compatible (Substitute is 0.090" shorter)
RoHS Status	ROHS3 Compliant	ROHS3 Compliant	Identical
Product Status	Obsolete	Active	Substitute is current production

Engineering Selection Recommendations

The 38FD3745A-F is a direct electrical and mechanical equivalent to the obsolete 38FD3745-F. Selection of the substitute part is based on the following engineering criteria:

Compliance & Availability: The substitute part maintains ROHS3 compliance and is in active production status, ensuring long-term availability and supply chain continuity for equipment maintenance and repair applications.

Dimensional Compatibility: The substitute part exhibits a maximum seated height of 3.160" (80.26mm) compared to the original part's 3.250" (82.55mm). This 0.090" (2.29mm) reduction in height is within acceptable mechanical tolerance for chassis-mounted applications using standard holder/bracket configurations.

Electrical Equivalence: All electrical parameters—capacitance, tolerance, voltage rating, and dielectric material—are identical between the main part and substitute. No circuit performance degradation is introduced by this substitution.

Termination & Lead Configuration: Quick Connect/Disconnect termination and 0.813" (20.64mm) lead spacing are preserved, ensuring direct compatibility with existing equipment wiring and connection points.

Frequently Asked Questions (FAQ)

Q: Can the 38FD3745A-F be used as a direct replacement for the 38FD3745-F in existing equipment?

A: Yes. The substitute part is electrically and mechanically equivalent across all critical parameters. The 0.090" reduction in seated height does not affect functionality in standard chassis-mount applications with holder/bracket configurations.

Q: Are there any electrical performance differences between these two parts?

A: No. Both parts are 45 µF, ±10% tolerance, 370V AC rated film capacitors with identical polypropylene metallized dielectric construction and operating temperature range (-40°C to 70°C).

Q: What is the significance of the product status difference (Obsolete vs. Active)?

A: The original 38FD3745-F is obsolete and no longer manufactured. The 38FD3745A-F is in active production, providing reliable supply availability for replacement and repair applications.

Q: Are both parts RoHS compliant?

A: Yes. Both the 38FD3745-F and 38FD3745A-F are ROHS3 compliant, meeting environmental and regulatory requirements for industrial and commercial applications.

Q: Does the slight height difference affect installation in existing equipment?

A: No. The 0.090" (2.29mm) height reduction of the substitute part is negligible for chassis-mounted applications. Standard holder/bracket configurations accommodate this dimensional variation without modification.

Q: What applications are these capacitors suitable for?

A: Both parts are rated for motor run and power factor correction (PFC) applications in industrial and commercial equipment operating at 370V AC.

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