23FD3735 Film Capacitor - Equivalent & Substitute Parts

Part Overview

The 23FD3735 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 construction with radial can packaging and quick connect termination.

The 23FD3735 carries an obsolete product status. Identifying equivalent substitute parts is necessary to maintain circuit functionality and ensure continued availability for repair, maintenance, and production applications where this component is specified.

Substiute Parts

23FD3735

Cornell Dubilier Electronics (CDE)In Stock: 83423FD3735 Datasheet

Current PartRFQ

23FD3735A-F

Cornell Dubilier Electronics (CDE)In Stock: 83123FD3735A-F Datasheet

DirectRFQ

SFS37T35K291B-F

Cornell Dubilier Electronics (CDE)In Stock: 1105SFS37T35K291B-F Datasheet

DirectRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitute parts for the 23FD3735 are qualified based on strict electrical and mechanical parameter matching:

Electrical Equivalence Criteria:

• Capacitance: 35 µF (exact match required)
• Voltage Rating - AC: 370V (minimum requirement)
• Tolerance: ±10% (matching specification)
• Dielectric Material: Polypropylene (PP), Metallized (same technology)
• Operating Temperature Range: -40°C ~ 70°C (minimum coverage required)

Mechanical Compatibility Criteria:

• Mounting Type: Chassis Mount, Requires Holder/Bracket
• Package / Case: Radial, Can
• Termination: Quick Connect, Disconnect
• Lead Spacing: 0.813" ± tolerance (allows minor dimensional variation)
• Physical dimensions: Within acceptable tolerance for holder/bracket compatibility

Identified Substitutes:

1. 23FD3735A-F - Direct series evolution with improved compliance status
2. SFS37T35K291B-F - Alternative series with equivalent electrical performance

Both substitutes meet all electrical and mechanical requirements for direct replacement in the 23FD3735 application.

Parameter Comparison

Engineering Selection Recommendations

For New Designs and Production: Select 23FD3735A-F or SFS37T35K291B-F. Both substitutes are active products with current manufacturing support. The 23FD3735A-F maintains the same MPF series designation and identical lead spacing (0.813"), providing the closest form-factor compatibility. Both substitutes achieve ROHS3 compliance and REACH unaffected status, meeting modern regulatory requirements that the obsolete 23FD3735 does not satisfy.

For Retrofit and Repair Applications: Either substitute is electrically and mechanically compatible. The 23FD3735A-F offers minimal dimensional variation and identical lead spacing. The SFS37T35K291B-F provides a compact alternative with slightly reduced height (3.030" vs. 3.250"), which may offer installation advantages in space-constrained applications while maintaining full electrical equivalence.

Compliance Considerations: The 23FD3735 is RoHS non-compliant. Both substitutes achieve ROHS3 compliance, making them suitable for applications subject to RoHS directives. The SFS37T35K291B-F additionally specifies REACH unaffected status, providing explicit regulatory clarity.

Frequently Asked Questions (FAQ)

Q: Can 23FD3735A-F directly replace 23FD3735 without circuit modification?

A: Yes. The 23FD3735A-F is electrically identical (35 µF, 370V AC, ±10% tolerance, polypropylene metallized dielectric) and mechanically compatible (identical lead spacing of 0.813", same mounting type and termination). The primary difference is product status (active vs. obsolete) and improved regulatory compliance.

Q: What is the significance of the height difference between substitutes?

A: The 23FD3735 has a maximum seated height of 3.250" (82.55mm), while 23FD3735A-F measures 3.160" (80.26mm) and SFS37T35K291B-F measures 3.030" (76.96mm). All three fit within standard chassis mount holder/bracket specifications. The reduced height of SFS37T35K291B-F may provide installation clearance advantages in compact enclosures without affecting electrical performance.

Q: Are the lead spacing differences significant?

A: Lead spacing is 0.813" (20.64mm) for both 23FD3735 and 23FD3735A-F, and 0.810" (20.57mm) for SFS37T35K291B-F. This 0.003" (0.07mm) difference is within standard mechanical tolerance for quick connect termination systems and holder/bracket compatibility. No circuit board or mounting modification is required.

Q: Why should I select an active product over the obsolete 23FD3735?

A: Active products (23FD3735A-F and SFS37T35K291B-F) have guaranteed manufacturing continuity, documented supply chains, and current quality certifications. The obsolete 23FD3735 has no manufacturing support and existing inventory will eventually deplete. For any new production or long-term applications, active substitutes ensure component availability and regulatory compliance.

Q: What is the difference between MPF and SF series designations?

A: Both are Cornell Dubilier film capacitor series with identical electrical specifications for this 35 µF 370V application. The series designation reflects internal design evolution. Both meet the same electrical and mechanical requirements for substitution.

Q: Are there any temperature or environmental performance differences?

A: All three parts specify identical operating temperature range (-40°C ~ 70°C) and polypropylene metallized dielectric construction. Environmental performance is equivalent across all three options.