21FD37175 Film Capacitor - Equivalent & Substitute Parts

Part Overview

The 21FD37175 is a 17.5 µF film capacitor manufactured by Cornell Dubilier Electronics (CDE) designed for AC applications at 370V. This polypropylene metallized radial capacitor is classified as Active product status and is commonly deployed in motor run and power factor correction (PFC) circuits requiring reliable energy storage and filtering in industrial and commercial equipment.

Substitute parts are identified when equivalent electrical performance and mechanical compatibility can be maintained across the same functional application space. The primary substitute listed maintains identical electrical specifications while offering improved regulatory compliance and alternative packaging configurations.

Substiute Parts

21FD37175

Cornell Dubilier Electronics (CDE)In Stock: 78121FD37175 Datasheet

Current PartRFQ

21FD37175A-F

Cornell Dubilier Electronics (CDE)In Stock: 118221FD37175A-F Datasheet

DirectRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution eligibility for the 21FD37175 is determined by strict equivalence across the following parameters:

Electrical Equivalence Requirements:

• Capacitance value: 17.5 µF (exact match)
• Voltage rating: 370V AC (minimum requirement)
• Tolerance: ±10% (matching specification)
• Dielectric material: Polypropylene (PP), Metallized (same technology)

Mechanical Compatibility Requirements:

• Mounting type: Chassis Mount with Holder/Bracket support
• Package form: Radial, Can configuration
• Lead spacing: 0.813" (20.64mm) for proper hole alignment
• Termination: Quick Connect, Disconnect interface

Environmental Compatibility:

• Operating temperature range: -40°C ~ 70°C minimum
• Moisture sensitivity: MSL 1 (Unlimited)

The substitute part 21FD37175A-F meets all electrical and mechanical equivalence criteria. Variations in height dimension (2.630" vs. 2.880") and packaging type (Bulk vs. standard) do not affect functional substitution when proper mechanical support is provided.

Parameter Comparison

Engineering Selection Recommendations

Primary Substitute: 21FD37175A-F

The 21FD37175A-F is a direct functional equivalent to the 21FD37175 across all critical electrical and mechanical parameters. Selection between these parts should be based on the following factors:

Regulatory Compliance Consideration: The 21FD37175A-F carries ROHS3 compliance certification, whereas the main part 21FD37175 is RoHS non-compliant. For applications subject to RoHS3 regulatory requirements in the European Union or equivalent jurisdictions, the substitute part is the appropriate selection.

Physical Dimension Consideration: The substitute part features a reduced seated height of 2.630" (66.80mm) compared to 2.880" (73.15mm) for the main part. This 0.250" (6.35mm) reduction in height may provide installation advantages in space-constrained chassis designs. The identical diameter (1.875" / 47.63mm) and lead spacing (0.813" / 20.64mm) ensure mechanical compatibility with existing bracket and mounting hole configurations.

Inventory and Packaging: The substitute part is available in Bulk packaging with higher inventory levels (1102 Pcs vs. 671 Pcs), which may support supply chain continuity for high-volume applications.

Application Compatibility: Both parts are rated for identical motor run and power factor correction (PFC) applications with matching electrical performance across the -40°C to 70°C operating temperature range.

Frequently Asked Questions (FAQ)

Q: Can 21FD37175A-F be used as a direct replacement for 21FD37175 in existing equipment?

A: Yes. The substitute part maintains identical capacitance (17.5 µF), voltage rating (370V AC), tolerance (±10%), dielectric material (Polypropylene metallized), mounting type (Chassis Mount), package form (Radial Can), lead spacing (0.813"), and termination type (Quick Connect/Disconnect). The reduced height dimension (2.630" vs. 2.880") does not prevent substitution when proper mechanical support is maintained through the holder/bracket system.

Q: What is the significance of the RoHS3 compliance difference?

A: The 21FD37175A-F carries ROHS3 certification while the main part is RoHS non-compliant. RoHS3 compliance is mandatory for electrical and electronic equipment sold in the European Union and certain other regulated markets. If your application or supply chain requires RoHS3 compliance, the substitute part is the appropriate selection.

Q: Are the electrical performance characteristics identical between these parts?

A: Yes. Both parts are manufactured by Cornell Dubilier Electronics in the MPF series with identical specifications: 17.5 µF capacitance, ±10% tolerance, 370V AC rating, polypropylene metallized dielectric, -40°C to 70°C operating range, and MSL 1 moisture sensitivity rating.

Q: Does the height difference affect circuit performance?

A: No. The height variation (0.250" / 6.35mm) is a physical dimension difference only and does not affect electrical performance, capacitance value, voltage rating, or functional operation in motor run or PFC applications.

Q: What mounting considerations apply to both parts?

A: Both parts require Chassis Mount installation with a holder/bracket system. The identical lead spacing of 0.813" (20.64mm) and radial can package form ensure compatibility with standard mounting hardware designed for this component class.

Q: Can these parts be used interchangeably in power factor correction circuits?

A: Yes. Both parts carry identical PFC application ratings with matching electrical specifications and operating temperature ranges suitable for industrial and commercial power factor correction installations.