32FD3706-F Film Capacitor Equivalent and Substitute Parts

Part Overview

The Cornell Dubilier Electronics 32FD3706-F is a 6 µF polypropylene film capacitor rated for 370V AC with ±10% tolerance. This component is classified as obsolete and serves applications in motor run circuits and power factor correction (PFC) systems. Due to its obsolete status, direct substitutes from the active product portfolio are necessary to ensure continuity of supply and system reliability. Equivalent alternatives maintain the critical electrical parameters while offering improved availability and, in certain cases, enhanced product status.

Key Parameters

Parameter	Value
Capacitance	6 µF
Tolerance	±10%
Voltage Rating (AC)	370V
Dielectric Material	Polypropylene (PP), Metallized
Operating Temperature Range	-40°C to 70°C
Package Type	Radial, Can
Mounting Type	Chassis Mount, Requires Holder/Bracket
Termination	Quick Connect, Disconnect
RoHS Status	ROHS3 Compliant

Substitute Part Grouping Explanation

Substitution eligibility is determined by the following mandatory parameters: capacitance (6 µF), tolerance (±10%), dielectric material (polypropylene), package type (radial can), and mounting configuration (chassis mount with quick connect termination). Voltage rating is a critical parameter that determines application suitability—substitutes may be rated at equal or higher AC voltage. The identified substitute parts fall into two categories:

Category 1: Direct Voltage Equivalent (370V AC)

32FD3706A-F (active product status, same voltage rating, reduced height)
SFA37T6K156B-F (active product status, different series, compact dimensions)
SFA37T6K219B-F (active product status, different series, tall profile)
32FD3706 (parametric equivalent, RoHS non-compliant)

Category 2: Elevated Voltage Rating (440V AC)

32FB4406A-F (active product status, higher voltage capability)

All substitutes maintain identical capacitance, tolerance, dielectric material, operating temperature range, and termination type. Variations in physical dimensions and product status are documented in the parameter comparison.

Parameter Comparison

Part Number	Manufacturer	Series	Product Status	Capacitance	Tolerance	Voltage Rating (AC)	Dielectric	Length × Width (mm)	Height (mm)	Lead Spacing (mm)	RoHS Status	Inventory
32FD3706-F	Cornell Dubilier Electronics	MPF	Obsolete	6 µF	±10%	370V	PP, Metallized	54.76 × 33.35	66.80	20.64	ROHS3 Compliant	1014 Pcs
32FB4406A-F	Cornell Dubilier Electronics	MPF	Active	6 µF	±10%	440V	PP, Metallized	54.76 × 33.35	61.98	20.64	ROHS3 Compliant	1049 Pcs
32FD3706A-F	Cornell Dubilier Electronics	MPF	Active	6 µF	±10%	370V	PP, Metallized	54.76 × 33.35	61.98	20.64	ROHS3 Compliant	816 Pcs
SFA37T6K156B-F	Cornell Dubilier Electronics	SF	Active	6 µF	±10%	370V	PP, Metallized	54.86 × 33.27	42.67	20.57	ROHS3 Compliant	980 Pcs
SFA37T6K219B-F	Cornell Dubilier Electronics	SF	Active	6 µF	±10%	370V	PP, Metallized	54.86 × 33.27	58.67	20.57	ROHS3 Compliant	1139 Pcs
32FD3706	Cornell Dubilier Electronics	MPF	Active	6 µF	±10%	370V	PP, Metallized	54.76 × 33.35	66.80	20.64	RoHS Non-Compliant	810 Pcs

Engineering Selection Recommendations

Preferred Substitutes (Highest Compatibility)

32FD3706A-F and 32FD3706 are direct electrical equivalents with identical footprint dimensions and lead spacing. Both maintain ROHS3 compliance. The 32FD3706A-F carries active product status, making it the primary substitute for new designs and ongoing procurement. The parametric equivalent 32FD3706 remains available but is classified as RoHS non-compliant and should be reserved for legacy applications where RoHS compliance is not required.

Alternative Substitutes (Compatible with Physical Constraints)

32FB4406A-F operates at 440V AC, providing enhanced voltage headroom while maintaining identical physical footprint and lead spacing. This substitute is applicable in systems where voltage derating is acceptable and where the higher rating provides system-level design flexibility. SFA37T6K156B-F and SFA37T6K219B-F belong to the SF series and offer compact form factors with reduced height (42.67 mm and 58.67 mm respectively, compared to 66.80 mm for the original). These alternatives are suitable for space-constrained applications where physical height is a design consideration. All active substitutes carry ROHS3 compliance and maintain the same lead spacing tolerance.

Frequently Asked Questions (FAQ)

Can I use 32FB4406A-F as a direct substitute?

Yes. The 32FB4406A-F maintains identical capacitance, tolerance, dielectric material, case package, lead spacing, and mounting type. The 440V AC rating is a superset of the 370V AC requirement and is electrically compatible. Physical height differs by 4.82 mm, which may affect mechanical fit depending on holder/bracket design.

What is the difference between the MPF and SF series?

The MPF series (32FD3706-F, 32FD3706A-F, 32FD3706, 32FB4406A-F) and SF series (SFA37T6K156B-F, SFA37T6K219B-F) are distinct product lines from Cornell Dubilier Electronics. Both use identical capacitance values, voltage ratings, tolerance, and dielectric material. The SF series offers more compact height profiles. Selection between series depends on available physical space and application constraints.

Are all substitutes ROHS3 compliant?

The active substitutes 32FD3706A-F, 32FB4406A-F, SFA37T6K156B-F, and SFA37T6K219B-F are ROHS3 compliant. The parametric equivalent 32FD3706 is RoHS non-compliant. Selection must account for end-product environmental and regulatory requirements.

What are the lead spacing and mounting implications?

All substitutes employ quick connect/disconnect termination and require chassis mount holders or brackets. MPF series parts (including the original 32FD3706-F) use 0.813" (20.64 mm) lead spacing. SF series parts (SFA37T6K156B-F and SFA37T6K219B-F) use 0.810" (20.57 mm) lead spacing—a difference of 0.07 mm that is negligible for standard chassis mount applications but should be confirmed with holder/bracket documentation.

Can I substitute the 32FD3706-F with components from different manufacturers?

This reference covers substitutes sourced exclusively from Cornell Dubilier Electronics. Cross-manufacturer equivalency evaluation requires additional analysis beyond the scope of this document.

Request Quote (Ships tomorrow)

Part Number

Quantity

Company

Contact Name

E-mail

Message