SS4R7M050ST Aluminum Electrolytic Capacitor - Equivalent & Substitute Parts

Part Overview

The SS4R7M050ST is a 4.7 µF, 50 V aluminum electrolytic capacitor manufactured by Cornell Dubilier Electronics (CDE) in a radial, can configuration for through-hole mounting. This part is classified as obsolete product status. Locating equivalent and substitute parts is necessary to maintain design continuity, ensure supply chain alternatives, and evaluate performance trade-offs in applications requiring 4.7 µF capacitance at 50 V rated voltage with radial lead configuration.

Key Parameters

Parameter	Value
Capacitance	4.7 µF
Voltage - Rated	50 V
Tolerance	±20%
Mounting Type	Through Hole
Package / Case	Radial, Can
Operating Temperature Range	-40°C ~ 85°C
Polarization	Polar
RoHS Status	ROHS3 Compliant
Applications	General Purpose

Substitute Part Grouping Explanation

Substitution eligibility for the SS4R7M050ST is determined by strict equivalence in the following parameters:

Capacitance: 4.7 µF (exact match required)
Voltage Rating: 50 V (exact match required)
Tolerance: ±20% (exact match required)
Mounting Type: Through Hole (exact match required)
Package / Case: Radial, Can (exact match required)
Polarization: Polar (exact match required)
Operating Temperature: -40°C ~ 85°C (must support full range)
RoHS3 Compliance: Required for regulatory alignment

All four identified parts meet these core substitution criteria. Secondary parameters including ESR, ripple current ratings, lifetime specifications, and physical dimensions are provided for design evaluation but do not disqualify substitution eligibility.

Parameter Comparison

Parameter	SS4R7M050ST (Main)	SK4R7M050ST	ECE-A1HKA4R7	ECA-1HM4R7
Manufacturer	Cornell Dubilier Electronics (CDE)	Cornell Dubilier Electronics (CDE)	Panasonic Electronic Components	Panasonic Electronic Components
Product Status	Obsolete	Active	Active	Active
Capacitance	4.7 µF	4.7 µF	4.7 µF	4.7 µF
Voltage - Rated	50 V	50 V	50 V	50 V
Tolerance	±20%	±20%	±20%	±20%
Operating Temperature Range	-40°C ~ 85°C	-40°C ~ 85°C	-40°C ~ 85°C	-40°C ~ 85°C
Package / Case	Radial, Can	Radial, Can	Radial, Can	Radial, Can
Mounting Type	Through Hole	Through Hole	Through Hole	Through Hole
RoHS Status	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant
Polarization	Polar	Not specified	Polar	Polar
ESR @ 120Hz	28.23 Ohm	28.23 Ohm	Not specified	Not specified
Lifetime @ 85°C	1000 Hrs	2000 Hrs	1000 Hrs	2000 Hrs
Size / Dimension (Diameter)	0.157" (4.00mm)	0.197" (5.00mm)	0.157" (4.00mm)	0.197" (5.00mm)
Height - Seated (Max)	0.276" (7.00mm)	0.512" (13.00mm)	0.276" (7.00mm)	0.472" (12.00mm)
Lead Spacing	0.079" (2.00mm)	0.079" (2.00mm)	0.059" (1.50mm)	0.079" (2.00mm)
Series	SS	SK	KA	M-A

Engineering Selection Recommendations

Active Product Alternatives: All four parts have ROHS3 compliance certification. Three substitute parts (SK4R7M050ST, ECE-A1HKA4R7, ECA-1HM4R7) carry active product status, providing supply chain stability and manufacturer support advantages over the obsolete SS4R7M050ST.

CDE Alternative (Within Manufacturer): The SK4R7M050ST remains within Cornell Dubilier Electronics product line, offering a path to alternative sourcing from the original manufacturer while maintaining established design relationships.

Panasonic Alternatives: The ECE-A1HKA4R7 and ECA-1HM4R7 from Panasonic Electronic Components provide active product status with published extended lifetime specifications (1000 Hrs and 2000 Hrs @ 85°C, respectively), supplying greater thermal endurance margins.

Physical Layout Considerations: ECE-A1HKA4R7 maintains identical physical footprint dimensions (0.157" diameter, 0.276" height, 0.059" lead spacing). SK4R7M050ST and ECA-1HM4R7 feature larger physical envelopes and tighter lead spacing must be confirmed against PCB layout constraints.

Frequently Asked Questions (FAQ)

Q: Can I directly substitute SK4R7M050ST for SS4R7M050ST? A: Yes. Both parts share identical electrical specifications (4.7 µF, 50 V, ±20%, 28.23 Ohm ESR), matching lead spacing (0.079"), and ROHS3 compliance. The SK4R7M050ST provides 2000 Hrs lifetime @ 85°C (double the SS4R7M050ST), and maintains active product status. Physical dimensions differ: SK4R7M050ST is larger (0.197" diameter, 0.512" height). Verify PCB layout accommodation before selection.

Q: What are the dimensional differences between substitute parts? A: ECE-A1HKA4R7 matches the SS4R7M050ST footprint exactly (0.157" diameter, 0.276" height). SK4R7M050ST and ECA-1HM4R7 are larger (0.197" diameter, 0.512" and 0.472" height respectively). ECE-A1HKA4R7 features tighter lead spacing (0.059" vs. 0.079"), requiring PCB clearance verification. All are through-hole radial configurations.

Q: Which substitute offers the longest thermal lifetime? A: ECA-1HM4R7 and SK4R7M050ST both specify 2000 Hrs @ 85°C, providing double the rated lifetime of SS4R7M050ST and ECE-A1HKA4R7 (1000 Hrs @ 85°C).

Q: Are all substitutes RoHS3 compliant? A: Yes. SS4R7M050ST, SK4R7M050ST, ECE-A1HKA4R7, and ECA-1HM4R7 are all certified ROHS3 compliant.

Q: What is the lead spacing difference between ECE-A1HKA4R7 and other parts? A: ECE-A1HKA4R7 has 0.059" (1.50mm) lead spacing, while SS4R7M050ST, SK4R7M050ST, and ECA-1HM4R7 have 0.079" (2.00mm) spacing. PCB through-hole pattern compatibility must be confirmed before substitution.

Q: Which parts have published ripple current specifications? A: SS4R7M050ST specifies 29 mA @ 120 Hz and 33.35 mA @ 1 kHz. ECE-A1HKA4R7 specifies 23 mA @ 120 Hz and 39.1 mA @ 10 kHz. ECA-1HM4R7 specifies 45 mA @ 120 Hz and 76.5 mA @ 10 kHz. SK4R7M050ST does not publish ripple current ratings.

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