Equivalent & Substitute Parts for 32FD3704-F Film Capacitor

Part Overview

The Cornell Dubilier Electronics (CDE) 32FD3704-F is a 4 µF film capacitor rated for 370V AC operation with polypropylene (PP) metallized dielectric construction. This component is classified as obsolete, necessitating identification of active equivalent and substitute parts for ongoing applications in motor run and power factor correction circuits. The 32FD3704-F operates across a temperature range of -40°C to 70°C and features radial can packaging with quick connect/disconnect termination suitable for chassis mount applications requiring a holder or bracket.

Key Parameters

Parameter	Value
Capacitance	4 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
Applications	Motor Run, Power Factor Correction (PFC)
RoHS Status	ROHS3 Compliant

Substitute Part Grouping Explanation

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

Primary Substitution Criteria:

Capacitance: 4 µF (exact match required)
Tolerance: ±10% (exact match required)
Voltage Rating (AC): 370V minimum (equal or higher voltage rating acceptable)
Dielectric Material: Polypropylene (PP), Metallized (exact match required)
Operating Temperature Range: -40°C to 70°C (minimum requirement)
Mounting Type: Chassis Mount, Requires Holder/Bracket (exact match required)
Package Type: Radial, Can (exact match required)
Termination: Quick Connect, Disconnect (exact match required)

Substitution Groups:

Group 1: Direct 370V AC Equivalents (Same Voltage Rating)

32FD3704A-F (Active status, MPF series)
SFA37T4K156B-F (Active status, SF series)
SFA37T4K219B-F (Active status, SF series)

Group 2: Higher Voltage Rating Substitutes (440V AC)

SFA44T4K156B-F (Active status, SF series, 440V AC rating)
SFA44T4K219B-F (Active status, SF series, 440V AC rating)

Components in Group 2 operate at higher voltage ratings and are electrically compatible with 370V AC circuits due to voltage derating principles. Physical dimensions vary within acceptable mechanical tolerances for chassis mount applications.

Parameter Comparison

Part Number	Manufacturer	Series	Capacitance	Tolerance	Voltage (AC)	Dielectric	Temp Range	Package	Status	Inventory
32FD3704-F	CDE	MPF	4 µF	±10%	370V	PP, Metallized	-40°C to 70°C	Radial, Can	Obsolete	1131 Pcs
32FD3704A-F	CDE	MPF	4 µF	±10%	370V	PP, Metallized	-40°C to 70°C	Radial, Can	Active	1178 Pcs
SFA37T4K156B-F	CDE	SF	4 µF	±10%	370V	PP, Metallized	-40°C to 70°C	Radial, Can	Active	1108 Pcs
SFA37T4K219B-F	CDE	SF	4 µF	±10%	370V	PP, Metallized	-40°C to 70°C	Radial, Can	Active	1194 Pcs
SFA44T4K156B-F	CDE	SF	4 µF	±10%	440V	PP, Metallized	-40°C to 70°C	Radial, Can	Active	690 Pcs
SFA44T4K219B-F	CDE	SF	4 µF	±10%	440V	PP, Metallized	-40°C to 70°C	Radial, Can	Active	819 Pcs

Engineering Selection Recommendations

For Direct Replacement (370V AC Applications):

The 32FD3704A-F is the primary direct replacement for the obsolete 32FD3704-F. Both components share identical electrical specifications (4 µF, ±10%, 370V AC) and dielectric properties. The 32FD3704A-F maintains active product status and is available in bulk packaging with 1178 units in stock. This part is ROHS3 compliant and REACH unaffected, meeting current regulatory requirements.

The SFA37T4K156B-F and SFA37T4K219B-F represent alternative 370V AC equivalents from the active SF series. These parts maintain all critical electrical parameters and are ROHS3 compliant. The primary distinction between these two parts is the seated 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 between these variants depends on available space within the chassis mount assembly.

For Higher Voltage Applications (440V AC Circuits):

The SFA44T4K156B-F and SFA44T4K219B-F are suitable for applications operating at 440V AC. These components provide voltage derating margin when used in 370V AC circuits. The SFA44T4K156B-F offers a compact seated height of 1.680" (42.67mm), while the SFA44T4K219B-F provides a seated height of 2.310" (58.67mm). Both maintain ROHS3 compliance and active product status.

Compliance and Regulatory Status:

All substitute parts are ROHS3 compliant and REACH unaffected, ensuring compatibility with current environmental and regulatory standards. The moisture sensitivity level (MSL) for SF series parts is not applicable, indicating superior moisture resistance compared to the original MPF series (MSL 1).

Frequently Asked Questions (FAQ)

Q: Can the 32FD3704A-F directly replace the obsolete 32FD3704-F?

A: Yes. The 32FD3704A-F is electrically and mechanically equivalent to the 32FD3704-F. Both components have identical capacitance (4 µF), tolerance (±10%), voltage rating (370V AC), dielectric material (PP, metallized), operating temperature range (-40°C to 70°C), and termination type (quick connect/disconnect). The maximum seated height differs slightly (2.440" vs. 2.380"), which is within acceptable mechanical tolerances for chassis mount applications.

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

A: Both parts are electrically identical 4 µF, 370V AC film capacitors with polypropylene metallized dielectric. The primary difference is physical height. The SFA37T4K156B-F has a maximum seated height of 1.680" (42.67mm), making it suitable for space-constrained applications. The SFA37T4K219B-F has a maximum seated height of 2.310" (58.67mm), providing a taller profile. Selection depends on available vertical space within the chassis mount assembly.

Q: Can 440V AC rated parts (SFA44T4K156B-F, SFA44T4K219B-F) be used in 370V AC circuits?

A: Yes. Components with higher voltage ratings are electrically compatible with lower voltage applications. The 440V AC rated parts operate safely in 370V AC circuits with voltage derating margin. This approach is acceptable when 370V AC equivalents are unavailable or when higher voltage rating provides system design benefits.

Q: Are all substitute parts ROHS3 compliant?

A: Yes. All substitute parts listed (32FD3704A-F, SFA37T4K156B-F, SFA37T4K219B-F, SFA44T4K156B-F, SFA44T4K219B-F) are ROHS3 compliant and REACH unaffected, meeting current environmental and regulatory requirements.

Q: What is the lead spacing for these film capacitors?

A: The 32FD3704-F and 32FD3704A-F have a lead spacing of 0.813" (20.64mm). The SF series parts (SFA37T4K156B-F, SFA37T4K219B-F, SFA44T4K156B-F, SFA44T4K219B-F) have a lead spacing of 0.810" (20.57mm). This minimal difference (0.03mm) is within acceptable mechanical tolerances for quick connect/disconnect termination systems.

Q: What applications are these film capacitors designed for?

A: The 32FD3704-F and all substitute parts are rated for motor run and power factor correction (PFC) applications. These components are suitable for AC motor circuits requiring capacitive energy storage and reactive power compensation.

Q: What is the moisture sensitivity level (MSL) for these parts?

A: The original 32FD3704-F has MSL 1 (unlimited moisture sensitivity). The SF series substitute parts (SFA37T4K156B-F, SFA37T4K219B-F, SFA44T4K156B-F, SFA44T4K219B-F) have MSL not applicable, indicating superior moisture resistance and more robust performance in humid environments.

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