474PPA122K Film Capacitor Equivalent & Substitute Parts

Part Overview

The 474PPA122K is a 0.47 µF film capacitor manufactured by Cornell Dubilier / Illinois Capacitor, rated for 1200V DC operation with polypropylene metallized dielectric construction. This axial-mounted through-hole component is designed for DC link, DC filtering, high frequency, switching, and snubber applications. The part maintains Active product status with 975 units currently in stock. Equivalent and substitute parts are identified to provide design flexibility, supply chain alternatives, and application-specific performance optimization while maintaining core electrical and mechanical compatibility.

Substiute Parts

474PPA122K

Cornell Dubilier / Illinois CapacitorIn Stock: 1031474PPA122K Datasheet

Current PartRFQ

940C12P47K-F

Cornell Dubilier Electronics (CDE)In Stock: 5411940C12P47K-F Datasheet

SimilarRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitute parts for the 474PPA122K are identified based on strict electrical and mechanical parameter alignment. The primary substitution criterion is matching capacitance value (0.47 µF) combined with equivalent or superior DC voltage rating (1200V minimum). Both the main part and substitute must utilize polypropylene metallized dielectric construction, maintain axial through-hole mounting configuration, and achieve ±10% tolerance specification.

Secondary compatibility parameters include operating temperature range, ESR characteristics, and physical dimensions. Substitute parts must maintain PC pin termination and comply with ROHS3 and REACH regulatory requirements. The 940C12P47K-F substitute meets all core electrical specifications while offering extended operating temperature range (-55°C ~ 105°C) and alternative AC voltage rating (500V versus 550V), with slightly elevated ESR (7 mOhms versus 4.8 mOhms).

Parameter Comparison

Engineering Selection Recommendations

The 474PPA122K and 940C12P47K-F are functionally equivalent for applications requiring 0.47 µF capacitance at 1200V DC with polypropylene metallized dielectric construction. Both parts maintain Active product status and full ROHS3 compliance with REACH unaffected designation, ensuring regulatory compatibility across industrial and commercial applications.

Selection between these parts is determined by application-specific requirements:

474PPA122K is selected when AC voltage rating of 550V is required, when ESR specification of 4.8 mOhms or lower is critical, or when operating temperature does not exceed 85°C. This part offers lower ESR performance suitable for high-frequency switching applications and snubber circuits with stringent ripple current specifications.

940C12P47K-F is selected when extended operating temperature range to 105°C is required, when higher inventory availability (5400 units) is advantageous for supply chain continuity, or when AC voltage rating of 500V is acceptable. The slightly elevated ESR (7 mOhms) and marginally larger physical diameter (23.00mm versus 22.00mm) must be verified for mechanical fit within the target PCB layout.

Both parts are certified for DC link, DC filtering, high frequency, and switching applications. Physical dimension variance (0.866" to 0.906" diameter) requires verification against PCB hole spacing and component placement constraints.

Frequently Asked Questions (FAQ)

Q: Can the 940C12P47K-F directly replace the 474PPA122K in all applications?

A: Direct replacement is possible for applications where AC voltage rating of 500V is acceptable and operating temperature does not exceed 105°C. The slightly larger physical diameter (23.00mm versus 22.00mm) must be verified against PCB layout constraints. ESR difference (7 mOhms versus 4.8 mOhms) may impact high-frequency ripple current performance.

Q: What is the significance of the AC voltage rating difference (550V versus 500V)?

A: AC voltage rating indicates the maximum RMS voltage the capacitor can withstand in AC applications. The 474PPA122K is rated for 550V AC, while the 940C12P47K-F is rated for 500V AC. For applications requiring AC voltage operation above 500V, the 474PPA122K must be used. For DC-only applications, AC voltage rating is not a limiting factor.

Q: How does the ESR difference affect circuit performance?

A: ESR (Equivalent Series Resistance) of 4.8 mOhms (474PPA122K) versus 7 mOhms (940C12P47K-F) impacts ripple current handling and heat dissipation. Lower ESR reduces resistive losses and heat generation, particularly in high-frequency switching and DC link applications. Applications with stringent ripple current specifications require verification that 7 mOhms ESR remains within acceptable limits.

Q: Are there physical dimension constraints for PCB integration?

A: Yes. The 474PPA122K measures 0.866" diameter, while the 940C12P47K-F measures 0.906" diameter. Both maintain 1.811" length. PCB hole spacing and component placement must accommodate the larger diameter of the substitute part. Axial lead spacing and through-hole mounting configuration remain identical.

Q: Do both parts meet current regulatory requirements?

A: Yes. Both the 474PPA122K and 940C12P47K-F are ROHS3 compliant and REACH unaffected, meeting current environmental and hazardous substance regulations for industrial and commercial applications.

Q: What is the operating temperature consideration for part selection?

A: The 474PPA122K operates from -55°C to 85°C, while the 940C12P47K-F extends to 105°C maximum. For applications operating above 85°C ambient temperature or with elevated component self-heating, the 940C12P47K-F provides extended thermal margin. For standard temperature range applications, both parts are equivalent.