Equivalent & Substitute Parts for 23FD3740-F Film Capacitor

Part Overview

The Cornell Dubilier Electronics (CDE) 23FD3740-F is a 40 µF film capacitor rated for 370V AC operation with polypropylene metallized dielectric construction. This component is designed for motor run and power factor correction (PFC) applications in chassis-mounted configurations. The 23FD3740-F carries an obsolete product status, making identification of active equivalent parts essential for procurement and system continuity. Two direct substitutes with active product status are available from the same manufacturer, both maintaining identical electrical specifications while offering improved availability.

Substiute Parts

23FD3740-F

Cornell Dubilier Electronics (CDE)In Stock: 107523FD3740-F Datasheet

Current PartRFQ

23FD3740A-F

Cornell Dubilier Electronics (CDE)In Stock: 112223FD3740A-F Datasheet

DirectRFQ

SFS37T40K291B-F

Cornell Dubilier Electronics (CDE)In Stock: 1117SFS37T40K291B-F Datasheet

DirectRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution eligibility for the 23FD3740-F is determined by strict equivalence across all critical electrical and mechanical parameters. The following parameters establish the substitution criteria:

Electrical Parameters (Non-Negotiable):

• Capacitance: 40 µF
• Voltage Rating (AC): 370V
• Tolerance: ±10%
• Dielectric Material: Polypropylene (PP), Metallized

Mechanical Parameters (Non-Negotiable):

• Mounting Type: Chassis Mount, Requires Holder/Bracket
• Termination Type: Quick Connect, Disconnect
• Operating Temperature Range: -40°C ~ 70°C

Compliance Parameters (Non-Negotiable):

• RoHS Status: ROHS3 Compliant

Both identified substitutes (23FD3740A-F and SFS37T40K291B-F) satisfy all mandatory criteria. Physical dimensions show minor variations within acceptable tolerances for radial can-type film capacitors. Both substitutes maintain active product status, ensuring long-term availability and supply chain reliability.

Parameter Comparison

Engineering Selection Recommendations

For 23FD3740A-F (Substitute 1):

The 23FD3740A-F represents the direct successor within the MPF series. This substitute maintains identical electrical specifications and lead spacing (0.813") as the obsolete 23FD3740-F. The height reduction from 3.250" to 3.160" falls within acceptable mechanical tolerances for radial can-type film capacitors and does not compromise mounting compatibility. Active product status ensures continuous availability. ROHS3 compliance and REACH Unaffected certification confirm regulatory alignment. This substitute is suitable for direct replacement in motor run and power factor correction applications.

For SFS37T40K291B-F (Substitute 2):

The SFS37T40K291B-F operates from the SF series and provides equivalent electrical performance with minor dimensional variations. The diameter reduction (2.120" vs. 2.125") and height reduction (3.030" vs. 3.250") remain within acceptable mechanical tolerances for chassis-mounted radial can capacitors. Lead spacing variation (0.810" vs. 0.813") is negligible for quick-connect termination systems. Active product status and ROHS3 compliance confirm suitability. The SF series designation indicates a different product line within CDE's portfolio, yet all critical electrical and mechanical parameters align with substitution requirements.

Both substitutes are qualified for direct replacement based on product status, compliance certifications, and electrical equivalence.

Frequently Asked Questions (FAQ)

Q: Why is the 23FD3740-F listed as obsolete?

A: The 23FD3740-F carries obsolete product status, indicating that Cornell Dubilier Electronics has discontinued active production and support. Two active equivalents (23FD3740A-F and SFS37T40K291B-F) are available to ensure supply chain continuity for applications requiring 40 µF, 370V AC film capacitors.

Q: Can I use either substitute interchangeably with the 23FD3740-F?

A: Both substitutes meet all mandatory electrical and mechanical criteria for direct replacement. The 23FD3740A-F maintains identical lead spacing and series designation. The SFS37T40K291B-F introduces minor dimensional variations that remain within acceptable tolerances for radial can-type film capacitors. Selection between the two depends on inventory availability and specific mechanical constraints of your application.

Q: What are the key differences between the two substitutes?

A: The 23FD3740A-F belongs to the MPF series and matches the original part's lead spacing exactly (0.813"). The SFS37T40K291B-F belongs to the SF series and exhibits slightly reduced dimensions (diameter 2.120" vs. 2.125", height 3.030" vs. 3.250", lead spacing 0.810" vs. 0.813"). Both maintain identical electrical specifications and operating temperature ranges. The MSL rating differs: 23FD3740A-F is rated 1 (Unlimited), while SFS37T40K291B-F is Not Applicable.

Q: Are there any compliance concerns with these substitutes?

A: Both substitutes are ROHS3 compliant and REACH Unaffected, confirming regulatory alignment with current environmental and hazardous substance directives. No compliance barriers exist for either substitute.

Q: Will the dimensional differences affect my installation?

A: The dimensional variations between substitutes are minor and fall within acceptable mechanical tolerances for radial can-type film capacitors. The 23FD3740A-F maintains identical lead spacing to the original part. The SFS37T40K291B-F exhibits negligible lead spacing variation (0.810" vs. 0.813") that does not compromise quick-connect termination compatibility. Both substitutes are designed for chassis-mount applications requiring holder/bracket support, consistent with the original part's mounting requirements.

Q: Which substitute should I select for new designs?

A: For new designs, either substitute is acceptable based on electrical and mechanical equivalence. The 23FD3740A-F offers the advantage of identical lead spacing and MPF series continuity. The SFS37T40K291B-F provides an alternative from the SF series with comparable performance. Selection should be based on inventory availability, supplier preference, and specific mechanical constraints of your application enclosure.

Q: Are these substitutes suitable for motor run and power factor correction applications?

A: Both substitutes are rated for motor run and power factor correction (PFC) applications, matching the original part's intended use. Electrical specifications (40 µF, 370V AC, ±10% tolerance, polypropylene metallized dielectric) and operating temperature range (-40°C ~ 70°C) are identical across all three parts, confirming functional equivalence for these applications.