DSF050J125 Equivalent & Substitute Parts

Part Overview

The DSF050J125 is a 1.2 µF polyester film capacitor rated for 50V DC with ±5% tolerance, manufactured by Cornell Dubilier Electronics (CDE) in the DSF series. This component is classified as obsolete, necessitating identification of active substitute parts that maintain equivalent electrical performance within specified application requirements. Substitute parts have been identified that preserve core capacitance and tolerance specifications while offering enhanced voltage ratings and expanded operational temperature ranges.

Substiute Parts

DSF050J125

Cornell Dubilier Electronics (CDE)In Stock: 821DSF050J125 Datasheet

Current PartRFQ

ECQ-E2125JB

Panasonic Electronic ComponentsIn Stock: 1708ECQ-E2125JB Datasheet

SimilarRFQ

ECW-FD2W125J

Panasonic Electronic ComponentsIn Stock: 1059ECW-FD2W125J Datasheet

SimilarRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitute parts for the DSF050J125 have been validated based on the following electrical and mechanical parameters:

Electrical Equivalence Criteria:

• Capacitance: 1.2 µF (exact match required)
• Tolerance: ±5% (exact match required)
• Voltage Rating (DC): Equal to or greater than 50V
• Dielectric Material: Polyester or polypropylene based metallized film
• Operating Temperature: Minimum range of -40°C to +85°C or broader

Mechanical Compatibility Criteria:

• Mounting Type: Through Hole (required)
• Package/Case: Radial (required)
• Termination: PC Pins (required)

Both identified substitutes (ECQ-E2125JB and ECW-FD2W125J) satisfy these criteria with enhanced voltage ratings and temperature ranges, providing superior performance margins in circuit applications.

Parameter Comparison

Engineering Selection Recommendations

ECQ-E2125JB Selection: This Panasonic substitute provides direct electrical equivalence with 250V DC rating, meeting or exceeding the original 50V specification with a 5× margin. Active product status ensures ongoing availability and manufacturing continuity. ROHS3 compliance and REACH unaffected status maintain regulatory alignment with the original component.

ECW-FD2W125J Selection: This Panasonic substitute delivers maximum voltage margin at 450V DC with polypropylene dielectric material, suitable for high-frequency, switching, and high pulse applications. Extended temperature rating to 110°C and active product status support long-term supply chain reliability. ROHS3 compliance is maintained.

Both substitutes are ROHS3 compliant, REACH unaffected, and classified under EAR99 export controls, matching the original component's regulatory posture.

Frequently Asked Questions (FAQ)

Q: Can ECQ-E2125JB and ECW-FD2W125J be used interchangeably with DSF050J125?

A: Both substitutes maintain the core electrical specification (1.2 µF ±5%) and mechanical compatibility (through-hole radial package with PC pins). The primary differences are enhanced voltage ratings, dielectric material composition, and expanded operating temperature ranges. Selection depends on application voltage requirements and thermal environment.

Q: What is the impact of different dielectric materials (polyester vs. polypropylene)?

A: The original DSF050J125 uses polyester dielectric. ECQ-E2125JB maintains polyester dielectric for closest electrical behavior. ECW-FD2W125J uses polypropylene dielectric, which supports higher frequency and pulse applications. Polyester-to-polypropylene substitution is permissible when circuit voltage and frequency characteristics remain within the 1.2 µF ±5% specification envelope.

Q: Are physical dimensions compatible between the original and substitute parts?

A: All parts feature through-hole radial mounting with PC pins. However, physical dimensions vary: DSF050J125 (10.20mm × 6.50mm), ECQ-E2125JB (15.30mm × 7.60mm), and ECW-FD2W125J (17.50mm × 8.50mm). PCB layout verification is required to confirm lead spacing and component clearance compatibility. Lead spacing increases from 7.50mm (original) to 12.50mm (ECQ-E2125JB) and 15.00mm (ECW-FD2W125J).

Q: Which substitute is recommended for general-purpose applications?

A: ECQ-E2125JB is recommended for general-purpose applications due to identical dielectric material (polyester) and closest performance characteristics to the original component. ECW-FD2W125J is reserved for applications requiring enhanced voltage margin, higher frequency operation, or elevated temperature environments above 105°C.

Q: Why is the original part obsolete?

A: The DSF050J125 is classified as obsolete by the manufacturer. Active substitute parts ensure design continuity and support procurement for new builds and legacy system maintenance.