SS010M050ST Aluminum Electrolytic Capacitor - Equivalent & Substitute Parts

Part Overview

The Cornell Dubilier Electronics (CDE) SS010M050ST is a 1 µF, 50 V aluminum electrolytic capacitor in radial configuration, designed for general-purpose applications. This component is currently obsolete, necessitating evaluation of equivalent and substitute parts for ongoing production and maintenance requirements. Alternative parts must meet or exceed the electrical and mechanical specifications of the original design to ensure functional compatibility.

Key Parameters

Parameter	Value
Capacitance	1 µF
Voltage Rating	50 V
Tolerance	±20%
ESR @ 120 Hz	132.7 Ω
Ripple Current @ 120 Hz	10 mA
Ripple Current @ 1 kHz	11.5 mA
Operating Temperature Range	-40°C to 85°C
Lifetime @ 85°C	1000 Hrs
Lead Spacing	0.059" (1.50 mm)
Case Diameter	0.157" (4.00 mm)
Height (Seated Max)	0.276" (7.00 mm)
Mounting Type	Through Hole
Package/Case	Radial, Can
Polarization	Polar
RoHS Status	ROHS3 Compliant

Substitute Part Grouping Explanation

Substitution eligibility for the SS010M050ST is determined by the following core electrical and mechanical parameters:

Mandatory Matching Parameters:

Capacitance: 1 µF (±20% tolerance)
Voltage Rating: 50 V minimum
Polarization: Polar
Mounting Type: Through Hole radial configuration
Package/Case: Radial, Can format
RoHS Compliance: ROHS3 Compliant

Physical Compatibility Parameters:

Lead Spacing: 0.059" (1.50 mm) preferred; alternative spacing requires PCB redesign
Case Diameter: 0.157" (4.00 mm) preferred; larger diameter allows substitution with physical clearance verification
Height (Seated Max): Original 0.276" (7.00 mm); functional substitutes may be taller within available space constraints

Performance Considerations:

ESR values must not exceed 132.7 Ω @ 120 Hz to maintain ripple current specifications
Lifetime ratings and operating temperature ranges may exceed original specifications without functional degradation

The SS010M050ST has been matched with two equivalent aluminum electrolytic capacitors meeting these substitution criteria.

Parameter Comparison

Parameter	SS010M050ST (Main)	SK010M050ST (CDE)	50ML1MEFC4X5 (Rubycon)
Manufacturer	Cornell Dubilier Electronics	Cornell Dubilier Electronics	Rubycon
Series	SS	SK	ML
Capacitance	1 µF	1 µF	1 µF
Voltage Rating	50 V	50 V	50 V
Tolerance	±20%	±20%	±20%
ESR @ 120 Hz	132.7 Ω	132.7 Ω	Not Specified
Operating Temperature Range	-40°C to 85°C	-40°C to 85°C	-40°C to 105°C
Lifetime @ Temperature	1000 Hrs @ 85°C	2000 Hrs @ 85°C	3000 Hrs @ 105°C
Lead Spacing	0.059" (1.50 mm)	0.079" (2.00 mm)	0.059" (1.50 mm)
Case Diameter	0.157" (4.00 mm)	0.197" (5.00 mm)	0.157" (4.00 mm)
Height (Seated Max)	0.276" (7.00 mm)	0.512" (13.00 mm)	0.256" (6.50 mm)
Ripple Current @ 120 Hz	10 mA	Not Specified	8 mA
Ripple Current @ High Frequency	11.5 mA @ 1 kHz	Not Specified	12 mA @ 10 kHz
Product Status	Obsolete	Active	Obsolete
RoHS Status	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant
Moisture Sensitivity Level	Not Applicable	MSL 1 (Unlimited)	Not Applicable

Engineering Selection Recommendations

SK010M050ST (Cornell Dubilier Electronics) - Preferred Substitute

The SK010M050ST represents the primary equivalent substitute for the obsolete SS010M050ST. Both components are manufactured by Cornell Dubilier Electronics and share identical electrical specifications (1 µF, 50 V, ±20% tolerance, 132.7 Ω ESR). The SK series offers extended lifetime performance (2000 Hrs @ 85°C vs. 1000 Hrs @ 85°C), enhanced moisture sensitivity classification (MSL 1 - Unlimited), and active product status ensuring continued availability.

Physical dimensions differ: the SK010M050ST features a 0.079" (2.00 mm) lead spacing and 0.197" (5.00 mm) case diameter compared to the original 0.059" (1.50 mm) spacing and 0.157" (4.00 mm) diameter. These dimensional differences necessitate PCB layout verification before implementation. The taller profile (0.512" vs. 0.276") requires clearance confirmation. For designs with rigid dimensional constraints, this substitute may require board redesign.

50ML1MEFC4X5 (Rubycon) - Alternative Substitute

The Rubycon 50ML1MEFC4X5 provides an alternative substitute with identical capacitance, voltage rating, and tolerance specifications. This component maintains the original lead spacing (0.059" / 1.50 mm) and case diameter (0.157" / 4.00 mm), making it suitable for designs with strict physical constraints. The reduced height (0.256" / 6.50 mm vs. 0.276" / 7.00 mm) offers minimal assembly space advantages.

The 50ML1MEFC4X5 delivers superior thermal performance with extended operating temperature range (-40°C to 105°C) and significantly extended lifetime rating (3000 Hrs @ 105°C). Ripple current specifications remain compatible (8 mA @ 120 Hz). However, this part carries obsolete product status. ESR specifications are not provided, requiring electrical verification during prototype validation.

Frequently Asked Questions (FAQ)

Q: Can the SK010M050ST be used as a direct replacement without PCB modifications?

A: The SK010M050ST shares identical electrical specifications but differs in physical dimensions. The increased lead spacing (0.079" vs. 0.059") and case diameter (0.197" vs. 0.157") require PCB layout verification. Direct substitution on existing boards is not recommended without clearance and footprint confirmation.

Q: Why is the 50ML1MEFC4X5 rated as obsolete if it offers better performance?

A: Product status reflects manufacturer production and distribution decisions rather than technical performance. The Rubycon ML series offers extended lifetime and temperature ratings, but the component is no longer in active production. Inventory availability may be limited. The SK010M050ST is recommended as the primary substitute due to active product status and guaranteed supply continuity.

Q: Are there electrical compatibility concerns when substituting the SK010M050ST or 50ML1MEFC4X5?

A: Both substitutes match the core electrical specifications (1 µF, 50 V, ±20%, 132.7 Ω ESR). The SK010M050ST maintains identical ESR. The 50ML1MEFC4X5 does not specify ESR, requiring circuit analysis or prototype testing if ripple current performance is critical to circuit function. Operating temperature ranges are equivalent or superior in all substitutes.

Q: Does lead spacing affect electrical performance or only physical placement?

A: Lead spacing is a physical parameter affecting PCB footprint geometry and assembly clearance. It does not directly impact electrical performance. However, board layout modifications to accommodate different spacing may alter circuit trace routing and impedance characteristics in high-frequency applications.

Q: What is the significance of the different lifetime ratings?

A: Lifetime rating (measured in hours at specified temperature) indicates expected operational longevity under continuous ripple current stress. The SS010M050ST offers 1000 Hrs @ 85°C, the SK010M050ST provides 2000 Hrs @ 85°C, and the 50ML1MEFC4X5 delivers 3000 Hrs @ 105°C. Extended lifetime improves reliability margins in continuous-duty applications but may not be relevant for intermittent use cases.

Q: Can both substitutes be used interchangeably, or is one preferred over the other?

A: The SK010M050ST is the preferred substitute due to active product status, guaranteed supply availability, and documented electrical specifications. The 50ML1MEFC4X5 is suitable for designs with strict dimensional constraints (matching original lead spacing and case diameter) where supply chain acceptance of obsolete components is acceptable.

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