37FD3735 Film Capacitor - Equivalent & Substitute Parts

Part Overview

The 37FD3735 is a 35 µF film capacitor rated for 370V AC operation, manufactured by Cornell Dubilier Electronics (CDE) in the MPF series. This component is designed for motor run and power factor correction (PFC) applications, featuring polypropylene metallized dielectric with radial can packaging and quick connect termination.

The 37FD3735 carries an obsolete product status. Identifying equivalent substitute parts ensures continued availability for maintenance, repair, and new production applications where this capacitor specification is required.

Substiute Parts

37FD3735

Cornell Dubilier Electronics (CDE)In Stock: 81837FD3735 Datasheet

Current PartRFQ

SFC37T35K291B-F

Cornell Dubilier Electronics (CDE)In Stock: 1101SFC37T35K291B-F Datasheet

DirectRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution eligibility for the 37FD3735 is determined by strict equivalence across the following critical parameters:

Electrical Parameters (Non-negotiable):

• Capacitance: 35 µF
• Tolerance: ±10%
• Voltage Rating (AC): 370V
• Dielectric Material: Polypropylene (PP), Metallized
• Operating Temperature Range: -40°C to 70°C

Mechanical Parameters (Non-negotiable):

• Package Type: Radial, Can
• Mounting Type: Chassis Mount, Requires Holder/Bracket
• Termination: Quick Connect, Disconnect

Acceptable Variations:

• Physical dimensions may vary within ±5% without affecting functional compatibility
• Lead spacing tolerance: ±0.05" (±1.27mm)
• Height variation acceptable if mounting bracket accommodates the component

The substitute part SFC37T35K291B-F meets all electrical and mechanical equivalence criteria and is classified as a direct substitute.

Parameter Comparison

Engineering Selection Recommendations

Direct Substitution Eligibility:

The SFC37T35K291B-F is a direct substitute for the 37FD3735 based on electrical and mechanical parameter equivalence. Both components share identical capacitance, voltage rating, tolerance, dielectric material, operating temperature range, package type, and termination configuration.

Product Status Consideration:

The 37FD3735 is classified as obsolete, while the SFC37T35K291B-F maintains active product status with current manufacturing support. Selection of the active substitute ensures long-term component availability and supply chain continuity.

Compliance Advantage:

The SFC37T35K291B-F is ROHS3 compliant, whereas the 37FD3735 is RoHS non-compliant. For applications subject to RoHS regulations or environmental compliance requirements, the substitute part provides regulatory alignment.

Physical Dimension Compatibility:

The substitute part exhibits a reduced seated height (3.030" versus 4.000"), while maintaining equivalent lead spacing and lateral dimensions within acceptable tolerance ranges. Verify that the mounting bracket and enclosure accommodate the shorter profile before implementation.

Inventory Availability:

The SFC37T35K291B-F is available in higher inventory quantities (999 pcs) compared to the 37FD3735 (710 pcs), supporting both immediate procurement and long-term stock planning.

Frequently Asked Questions (FAQ)

Q: Can the SFC37T35K291B-F be used as a direct replacement for the 37FD3735 in existing applications?

A: Yes. The SFC37T35K291B-F is electrically and mechanically equivalent to the 37FD3735. Both components have identical capacitance (35 µF), voltage rating (370V AC), tolerance (±10%), dielectric material (polypropylene metallized), operating temperature range (-40°C to 70°C), package type (radial can), and termination configuration (quick connect/disconnect). Physical dimensions are within acceptable tolerance ranges.

Q: What is the significance of the height difference between these two parts?

A: The SFC37T35K291B-F has a maximum seated height of 3.030 inches, compared to 4.000 inches for the 37FD3735. This 0.97-inch reduction in height may affect mounting bracket compatibility. Verify that the existing mounting bracket and enclosure provide adequate clearance for the substitute component before installation.

Q: Why is the 37FD3735 marked as obsolete?

A: The 37FD3735 is classified as obsolete by the manufacturer, indicating that production has been discontinued. The SFC37T35K291B-F, which is active and in current production, serves as the recommended replacement for new designs and ongoing maintenance applications.

Q: Does the RoHS compliance difference affect substitution eligibility?

A: The RoHS compliance difference does not prevent substitution from an electrical or mechanical standpoint. However, for applications subject to RoHS regulations or environmental compliance mandates, the ROHS3-compliant SFC37T35K291B-F is the appropriate selection. For legacy systems without RoHS requirements, both parts are functionally equivalent.

Q: Are the lead spacing differences significant?

A: The lead spacing difference is minimal (0.813" versus 0.810", or 0.03 inches / 0.76mm). This variation is within standard manufacturing tolerance and does not affect compatibility with standard quick connect/disconnect termination systems or PCB layouts designed for the 37FD3735.

Q: What applications are these capacitors suitable for?

A: Both the 37FD3735 and SFC37T35K291B-F are designed for motor run and power factor correction (PFC) applications. The 370V AC rating and 35 µF capacitance are typical for three-phase motor run capacitors and industrial power factor correction circuits.

Q: Is there any performance difference between the MPF series (37FD3735) and SF series (SFC37T35K291B-F)?

A: Both series use identical polypropylene metallized dielectric technology and share the same electrical specifications. The series designation reflects different product lines within Cornell Dubilier Electronics' portfolio. From an application standpoint, performance characteristics are equivalent for the specified electrical parameters.