Equivalent & Substitute Parts for Cornell Dubilier Electronics 32FD3704

Part Overview

The Cornell Dubilier Electronics 32FD3704 is a 4 µF film capacitor rated for 370V AC operation with polypropylene (PP) metallized dielectric construction. This component is designed for motor run and power factor correction (PFC) applications in chassis-mounted configurations requiring quick connect/disconnect termination. The 32FD3704 is classified as obsolete product status, necessitating identification of active equivalent alternatives from the same manufacturer's current product line to maintain design compatibility and ensure continued component availability.

Substiute Parts

32FD3704

Cornell Dubilier Electronics (CDE)In Stock: 76232FD3704 Datasheet

Current PartRFQ

SFA37T4K156B-F

Cornell Dubilier Electronics (CDE)In Stock: 1205SFA37T4K156B-F Datasheet

DirectRFQ

SFA37T4K219B-F

Cornell Dubilier Electronics (CDE)In Stock: 1285SFA37T4K219B-F Datasheet

DirectRFQ

SFA44T4K156B-F

Cornell Dubilier Electronics (CDE)In Stock: 773SFA44T4K156B-F Datasheet

DirectRFQ

SFA44T4K219B-F

Cornell Dubilier Electronics (CDE)In Stock: 835SFA44T4K219B-F Datasheet

DirectRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution eligibility for the 32FD3704 is determined by the following critical parameters:

Primary Electrical Parameters (Must Match):

• Capacitance: 4 µF
• Tolerance: ±10%
• Dielectric Material: Polypropylene (PP), Metallized
• Operating Temperature Range: -40°C ~ 70°C
• Termination Type: Quick Connect, Disconnect
• Applications: Motor Run

Voltage Rating Consideration: The 32FD3704 operates at 370V AC. Substitute parts may operate at equal or higher voltage ratings (370V or 440V) while maintaining all other electrical specifications. Higher voltage ratings provide design margin and are electrically compatible with 370V applications.

Mechanical Parameters (Allowable Variation):

• Package / Case: Radial, Can (must match)
• Mounting Type: Chassis Mount, Requires Holder/Bracket (must match)
• Lead Spacing: 0.810" to 0.813" (20.57mm to 20.64mm) - minor tolerance variation acceptable
• Physical Dimensions: Slight variations in length, width, and height are acceptable provided the component fits within the designated mounting space and holder/bracket configuration

Product Status: Active substitute parts are preferred over obsolete components to ensure long-term availability and supply chain continuity.

Parameter Comparison

Engineering Selection Recommendations

For 370V AC Applications (Direct Voltage Match):

SFA37T4K156B-F and SFA37T4K219B-F are direct electrical equivalents to the 32FD3704, both rated at 370V AC with identical capacitance, tolerance, dielectric material, and operating temperature specifications. Both parts are active products with ROHS3 compliance. Selection between these two parts depends on physical height constraints within the mounting assembly:

• SFA37T4K156B-F: Maximum seated height of 1.680" (42.67mm) for space-constrained applications
• SFA37T4K219B-F: Maximum seated height of 2.310" (58.67mm), closer to the original 32FD3704 height of 2.380" (60.45mm)

For 440V AC Applications (Higher Voltage Rating):

SFA44T4K156B-F and SFA44T4K219B-F operate at 440V AC, providing increased voltage margin above the original 370V specification. These parts maintain all other electrical and mechanical compatibility parameters. Selection follows the same height-based criteria:

• SFA44T4K156B-F: Maximum seated height of 1.680" (42.67mm)
• SFA44T4K219B-F: Maximum seated height of 2.310" (58.67mm)

Compliance Advantage:

All substitute parts are ROHS3 compliant, addressing regulatory requirements that the obsolete 32FD3704 does not meet. This compliance status is significant for new designs, system upgrades, and applications subject to environmental regulations.

Lead Spacing Compatibility:

All substitute parts feature 0.810" (20.57mm) lead spacing, compared to the original 32FD3704 at 0.813" (20.64mm). This 0.003" (0.07mm) difference is within standard mechanical tolerance for quick connect/disconnect termination systems and does not affect functional compatibility.

Frequently Asked Questions (FAQ)

Q: Can SFA44T4K156B-F or SFA44T4K219B-F be used as direct replacements for the 32FD3704 in a 370V AC circuit?

A: Yes. The 440V AC rating of these parts is higher than the 370V AC requirement of the 32FD3704. In electrical systems, a component rated for higher voltage can operate safely at lower voltages. All other electrical parameters (capacitance, tolerance, dielectric material, temperature range) are identical, ensuring functional equivalence.

Q: What is the difference between SFA37T4K156B-F and SFA37T4K219B-F?

A: Both parts are electrically identical 4 µF, 370V AC film capacitors with ±10% tolerance and polypropylene metallized dielectric. The primary difference is physical height: SFA37T4K156B-F has a maximum seated height of 1.680" (42.67mm), while SFA37T4K219B-F has a maximum seated height of 2.310" (58.67mm). Selection depends on available space within the mounting bracket or holder assembly.

Q: Are the lead spacing differences between the 32FD3704 and substitute parts significant?

A: The 32FD3704 has 0.813" (20.64mm) lead spacing, while all substitute parts have 0.810" (20.57mm) lead spacing. This 0.003" (0.07mm) difference is negligible for quick connect/disconnect termination systems and does not affect mechanical compatibility with standard holder/bracket configurations.

Q: Why should I choose an active product over the obsolete 32FD3704?

A: Active products ensure long-term availability, consistent manufacturing quality, and supply chain continuity. The obsolete 32FD3704 faces increasing scarcity and potential discontinuation. Additionally, active substitute parts meet ROHS3 compliance standards, addressing current environmental and regulatory requirements.

Q: Can I use SFA37T4K156B-F in an application where the original 32FD3704 had a height of 2.380" (60.45mm)?

A: SFA37T4K156B-F has a maximum seated height of 1.680" (42.67mm), which is significantly shorter than the original 32FD3704. Physical fit depends on the specific mounting bracket or holder design. If vertical space is constrained, SFA37T4K219B-F (2.310" maximum height) provides a closer dimensional match, though still 0.070" shorter than the original.

Q: What is the advantage of ROHS3 compliance in the substitute parts?

A: ROHS3 compliance indicates that the substitute parts meet Restriction of Hazardous Substances regulations, restricting the use of specific hazardous materials in electrical and electronic equipment. This compliance is required for many applications, particularly in regulated industries and export markets. The obsolete 32FD3704 is RoHS non-compliant, making active substitutes necessary for compliant system designs.

Q: Are all substitute parts suitable for motor run and power factor correction applications?

A: Yes. All substitute parts (SFA37T4K156B-F, SFA37T4K219B-F, SFA44T4K156B-F, SFA44T4K219B-F) are specified for motor run and power factor correction applications, matching the original 32FD3704 application profile.