37FD3720 Film Capacitor Equivalent & Substitute Parts

Part Overview

The 37FD3720 is a 20 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 with a radial, can-style package and quick connect/disconnect termination. The part is currently listed as obsolete, necessitating the identification of compatible alternative models to ensure continued circuit functionality and supply chain continuity.

Substiute Parts

37FD3720

Cornell Dubilier Electronics (CDE)In Stock: 121237FD3720 Datasheet

Current PartRFQ

37FD3720A-F

Cornell Dubilier Electronics (CDE)In Stock: 106237FD3720A-F Datasheet

DirectRFQ

Key Parameters

Substitute Part Grouping Explanation

The 37FD3720A-F qualifies as a direct substitute based on matching electrical and mechanical parameters across all critical dimensions:

• Capacitance & Tolerance: Both parts specify 20 µF at ±10% tolerance
• Voltage Rating: Both rated for 370V AC operation
• Dielectric Material: Both utilize Polypropylene (PP) metallized construction
• Temperature Range: Both support -40°C ~ 70°C operating envelope
• Mounting & Termination: Both employ chassis mount with quick connect/disconnect termination
• Lead Spacing: Both maintain 0.813" (20.64mm) lead spacing for circuit board compatibility
• Applications: Both support motor run and PFC applications

The 37FD3720A-F represents an active product status upgrade from the obsolete 37FD3720, with improved RoHS3 compliance and REACH unaffected status.

Parameter Comparison

Engineering Selection Recommendations

The 37FD3720A-F is the appropriate substitute for the obsolete 37FD3720. Selection rationale is based on:

• Product Continuity: The substitute maintains full electrical equivalence across all specified parameters, ensuring circuit performance remains unchanged.
• Compliance Status: The 37FD3720A-F achieves ROHS3 compliance and REACH unaffected designation, meeting current regulatory requirements for new product designs and applications.
• Active Availability: Transition to the active product status ensures long-term supply continuity and manufacturing support.
• Physical Compatibility: Dimensional consistency, including matching lead spacing and mounting requirements, enables direct board-level substitution.

Frequently Asked Questions (FAQ)

Q: Can the 37FD3720A-F replace the 37FD3720 in existing circuits? A: Yes. The 37FD3720A-F is electrically and mechanically equivalent. All critical parameters—capacitance, voltage rating, tolerance, dielectric material, operating temperature, and lead spacing—are identical, enabling direct substitution in motor run and PFC applications.

Q: What is the primary difference between these two parts? A: The 37FD3720A-F is the active product replacement for the obsolete 37FD3720. The substitute achieves ROHS3 compliance and has a slightly reduced maximum seated height (2.630" versus 2.880"), which may improve space efficiency in chassis-mounted applications.

Q: Are there any packaging considerations for substitution? A: The 37FD3720 is supplied in tape packaging, while the 37FD3720A-F is available in bulk packaging. Both maintain identical physical dimensions and termination type (quick connect/disconnect), ensuring mounting compatibility in holder/bracket configurations.

Q: What applications are supported by these capacitors? A: Both parts are rated for motor run and power factor correction (PFC) applications at 370V AC operation, with -40°C ~ 70°C operating temperature capability across the specified ±10% capacitance tolerance.

Q: Is the voltage rating suitable for all AC supply frequencies? A: The 370V AC rating applies to standard industrial frequencies. Application suitability depends on the specific circuit design and supply characteristics; the specified electrical parameters define the operational envelope for both parts.