DSF050J185 Equivalent & Substitute Parts Reference

Part Overview

The DSF050J185 is a 1.8 µF film capacitor rated at 50V DC, manufactured by Cornell Dubilier Electronics (CDE) in the DSF series. This component features polyester metallized-stacked dielectric construction with radial through-hole mounting. The part is classified as obsolete, necessitating identification of active equivalent alternatives that maintain functional compatibility within specified electrical and mechanical constraints.

Substiute Parts

DSF050J185

Cornell Dubilier Electronics (CDE)In Stock: 726DSF050J185 Datasheet

Current PartRFQ

ECQ-E2185JB

Panasonic Electronic ComponentsIn Stock: 1596ECQ-E2185JB Datasheet

SimilarRFQ

ECW-F2185JAB

Panasonic Electronic ComponentsIn Stock: 1048ECW-F2185JAB Datasheet

SimilarRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution of the DSF050J185 is determined by the following critical parameters:

Mandatory Matching Criteria:

• Capacitance: 1.8 µF (exact match required)
• Tolerance: ±5% (exact match required)
• Mounting Type: Through Hole (exact match required)
• Package / Case: Radial (exact match required)
• Termination: PC Pins (exact match required)

Allowable Variation Criteria:

• Voltage Rating - DC: Substitute must equal or exceed 50V
• Dielectric Material: Polyester or Polypropylene metallized construction acceptable
• Operating Temperature Range: Substitute must support minimum -40°C ~ 85°C envelope
• Physical Dimensions: Variation permitted if PCB layout accommodates
• Lead Spacing: 0.295" (7.50mm) preferred; alternative spacing acceptable if board design permits

The identified substitute parts ECQ-E2185JB and ECW-F2185JAB satisfy all mandatory matching criteria and exceed voltage rating requirements, ensuring functional compatibility in applications originally designed for the DSF050J185.

Parameter Comparison

Engineering Selection Recommendations

ECQ-E2185JB Selection Criteria:

• Active product status with continuous manufacturing support
• Polyester dielectric material matches original DSF050J185 composition
• 250V DC rating provides 5× voltage margin above 50V requirement
• Extended operating temperature range (-40°C ~ 105°C) exceeds original specification
• ROHS3 and REACH compliance maintained
• Lead spacing of 0.689" (17.50mm) requires PCB layout verification; not compatible with original 0.295" (7.50mm) spacing without board redesign

ECW-F2185JAB Selection Criteria:

• Active product status with continuous manufacturing support
• Polypropylene dielectric material suitable for high-frequency and switching applications
• 250V DC rating provides 5× voltage margin above 50V requirement
• Extended operating temperature range (-40°C ~ 105°C) exceeds original specification
• ROHS3 and REACH compliance maintained
• Lead spacing of 0.295" (7.50mm) matches original part, enabling direct PCB compatibility
• Larger physical dimensions (0.740" L x 0.449" W, height 0.906") require board space verification

Both substitutes satisfy all mandatory electrical and compliance requirements. Selection between ECQ-E2185JB and ECW-F2185JAB depends on PCB layout constraints and application frequency characteristics.

Frequently Asked Questions (FAQ)

Q: Can ECQ-E2185JB or ECW-F2185JAB be used as direct replacements for DSF050J185?

A: Both parts satisfy mandatory electrical parameters: 1.8 µF capacitance, ±5% tolerance, through-hole radial mounting, and PC pin termination. However, physical dimensions and lead spacing differ. ECW-F2185JAB maintains the original 0.295" (7.50mm) lead spacing for direct PCB compatibility. ECQ-E2185JB requires lead spacing adjustment from 0.295" to 0.689" (17.50mm), necessitating PCB layout modification.

Q: Why do the substitute parts have higher voltage ratings (250V) than the original (50V)?

A: Higher voltage ratings in active production parts reflect current manufacturing standards and component availability. The 250V rating provides design margin and does not negatively impact circuit performance in 50V applications. Capacitance, tolerance, and dielectric properties remain the controlling parameters for functional equivalence.

Q: What is the difference between polyester and polypropylene dielectric materials in these parts?

A: The DSF050J185 and ECQ-E2185JB use polyester dielectric; ECW-F2185JAB uses polypropylene. Both are metallized film constructions suitable for general-purpose applications. Polypropylene (ECW-F2185JAB) exhibits superior performance in high-frequency and switching applications. Selection depends on circuit operating frequency and application requirements.

Q: Are there physical size constraints when substituting these parts?

A: Yes. The DSF050J185 measures 0.402" L x 0.283" W with 0.512" seated height. ECQ-E2185JB measures 0.819" L x 0.299" W with 0.614" seated height. ECW-F2185JAB measures 0.740" L x 0.449" W with 0.906" seated height. PCB layout must accommodate the selected substitute's physical envelope. ECW-F2185JAB's larger width (0.449") and height (0.906") require verification against available board space.

Q: Do all substitute parts maintain RoHS3 and REACH compliance?

A: Yes. DSF050J185, ECQ-E2185JB, and ECW-F2185JAB are all ROHS3 Compliant and REACH Unaffected, maintaining regulatory compliance for current manufacturing and distribution requirements.

Q: What is the significance of lead spacing differences?

A: Lead spacing determines PCB hole pattern compatibility. DSF050J185 and ECW-F2185JAB both use 0.295" (7.50mm) spacing, enabling direct PCB mounting without modification. ECQ-E2185JB uses 0.689" (17.50mm) spacing, requiring PCB redesign or manual lead bending to achieve compatibility. Direct lead spacing match (ECW-F2185JAB) is preferred for production environments.