SS2R2M050ST Aluminum Electrolytic Capacitor Equivalents & Substitutes

Part Overview

The SS2R2M050ST is a 2.2 µF, 50 V aluminum electrolytic capacitor in radial, can package manufactured by Cornell Dubilier Electronics (CDE). This component is classified as obsolete, making the identification of functionally equivalent alternatives essential for ongoing design support and board-level repairs. Equivalent and substitute parts share the same core electrical specifications (2.2 µF capacitance, 50 V rated voltage, ±20% tolerance) while varying in mechanical packaging, thermal characteristics, and manufacturer lineage.

Key Parameters

Parameter	SS2R2M050ST Value
Capacitance	2.2 µF
Voltage Rating	50 V
Tolerance	±20%
Package Type	Radial, Can
Mounting Type	Through Hole
Lead Spacing	0.059" (1.50 mm)
Case Diameter	0.157" (4.00 mm)
Height (Seated Max)	0.276" (7.00 mm)
ESR @ 120 Hz	60.32 Ω
Lifetime @ 85°C	1000 Hrs
Operating Temperature Range	-40°C to +85°C
RoHS Compliance	ROHS3 Compliant

Substitute Part Grouping Explanation

Substitution eligibility is determined by matching the following mandatory parameters: capacitance (2.2 µF), voltage rating (50 V), tolerance (±20%), package type (radial, can), and mounting method (through hole). Additional compatibility is assessed through case diameter, height, and lead spacing to ensure mechanical fit on target PCBs. Substitute parts are categorized as follows:

Direct Equivalents – Parts with identical or tighter mechanical tolerances and matching electrical specifications:

ECE-A1HKS2R2 and ECE-A1HKA2R2 (Panasonic, KS and KA series)
Identical case diameter (0.157", 4.00 mm) and lead spacing (0.059", 1.50 mm)

Similar Substitutes – Parts with identical electrical core specifications but with dimensional variations:

SK2R2M050ST (CDE, SK series): Larger case diameter (0.197", 5.00 mm), increased height (0.512", 13.00 mm)
ECE-A1HKS2R2B (Panasonic, Cut Tape): Wider lead spacing (0.197", 5.00 mm), identical case diameter and height to direct equivalents
EEA-GA1H2R2 (Panasonic, GA-A series): Identical case and height, matching lead spacing

Upgraded/Alternative Substitutes – Parts meeting electrical requirements with enhanced thermal performance:

50ML2.2MEFC4X5 (Rubycon, ML series): Extended operating temperature range (-40°C to +105°C) and superior lifetime rating (3000 Hrs @ 105°C)

Parameter Comparison

Part Number	Manufacturer	Capacitance	Voltage	Tolerance	Case Dia	Height Max	Lead Spacing	Lifetime @ Temp	Operating Temp	Status
SS2R2M050ST	CDE	2.2 µF	50 V	±20%	0.157" (4.00 mm)	0.276" (7.00 mm)	0.059" (1.50 mm)	1000 Hrs @ 85°C	-40°C to +85°C	Obsolete
SK2R2M050ST	CDE	2.2 µF	50 V	±20%	0.197" (5.00 mm)	0.512" (13.00 mm)	0.079" (2.00 mm)	2000 Hrs @ 85°C	-40°C to +85°C	Active
ECE-A1HKS2R2	Panasonic	2.2 µF	50 V	±20%	0.157" (4.00 mm)	0.236" (6.00 mm)	0.059" (1.50 mm)	1000 Hrs @ 85°C	-40°C to +85°C	Active
ECE-A1HKS2R2B	Panasonic	2.2 µF	50 V	±20%	0.157" (4.00 mm)	0.236" (6.00 mm)	0.197" (5.00 mm)	1000 Hrs @ 85°C	-40°C to +85°C	Active
50ML2.2MEFC4X5	Rubycon	2.2 µF	50 V	±20%	0.157" (4.00 mm)	0.256" (6.50 mm)	0.059" (1.50 mm)	3000 Hrs @ 105°C	-40°C to +105°C	Obsolete
EEA-GA1H2R2	Panasonic	2.2 µF	50 V	±20%	0.157" (4.00 mm)	0.276" (7.00 mm)	0.059" (1.50 mm)	1000 Hrs @ 105°C	-55°C to +105°C	Active
ECE-A1HKA2R2	Panasonic	2.2 µF	50 V	±20%	0.157" (4.00 mm)	0.276" (7.00 mm)	0.059" (1.50 mm)	1000 Hrs @ 85°C	-40°C to +85°C	Active

Engineering Selection Recommendations

For Direct Replacement (Active Component Status Required): ECE-A1HKS2R2 and ECE-A1HKA2R2 (Panasonic) are preferred direct substitutes. Both maintain identical mechanical footprints (0.157" diameter, 0.059" lead spacing) and electrical ratings to the original SS2R2M050ST. Both are active products with ROHS3 compliance and REACH certification, ensuring long-term supply chain availability.

For Extended Thermal Performance: EEA-GA1H2R2 (Panasonic, GA-A series) provides identical mechanical compatibility with the original part while offering extended operating temperature range (-55°C to +105°C) and higher lifetime rating (1000 Hrs @ 105°C). This part is actively produced and fully compliant with ROHS3 and REACH standards.

For Applications Requiring Higher Lead Spacing: ECE-A1HKS2R2B (Panasonic) accommodates PCB layouts with wider through-hole pitch (0.197" lead spacing) while maintaining the same case diameter and height as ECE-A1HKS2R2. This variant is supplied in cut tape packaging and is actively available.

For Similar Manufacturer Continuation (CDE Product Line): SK2R2M050ST (CDE, SK series) continues the original manufacturer's product line with active status. Mechanical footprint is larger (0.197" case diameter, 0.512" height, 0.079" lead spacing) and thermal endurance is doubled (2000 Hrs @ 85°C). PCB layout verification is required for dimensional compatibility.

Frequently Asked Questions (FAQ)

Q: Can ECE-A1HKS2R2 directly replace SS2R2M050ST on existing PCBs? A: Yes. Both parts have identical case diameter (0.157", 4.00 mm) and lead spacing (0.059", 1.50 mm). ECE-A1HKS2R2 is slightly shorter (0.236" vs. 0.276"), which presents no obstruction risk. Electrical parameters (2.2 µF, 50 V, ±20% tolerance) are equivalent.

Q: What is the primary difference between ECE-A1HKS2R2 and ECE-A1HKS2R2B? A: Both are electrically identical Panasonic KS-series capacitors. The difference is lead spacing: ECE-A1HKS2R2 has standard 0.059" spacing, while ECE-A1HKS2R2B has wider 0.197" spacing for PCBs designed with larger through-hole pitch. Packaging differs as well (bulk vs. cut tape).

Q: Why would EEA-GA1H2R2 be selected over ECE-A1HKS2R2? A: EEA-GA1H2R2 offers extended operating temperature capability (-55°C to +105°C vs. -40°C to +85°C) and higher lifetime rating at elevated temperature (1000 Hrs @ 105°C). For applications exposed to higher ambient or case temperatures, this part provides improved reliability margin. Mechanical fit remains identical.

Q: Is SK2R2M050ST suitable for designs that require the SS2R2M050ST footprint? A: SK2R2M050ST has a significantly larger footprint (0.197" case diameter vs. 0.157", height 0.512" vs. 0.276"). It is suitable only if PCB layout permits the larger dimensions and wider lead spacing (0.079" vs. 0.059"). Verification against physical constraints is required before selection.

Q: What is the significance of "obsolete" status for 50ML2.2MEFC4X5? A: Obsolete status indicates discontinuation of this Rubycon ML-series part. While it offers superior thermal performance (3000 Hrs @ 105°C, -40°C to +105°C operating range), procurement availability may be limited. Active alternatives with similar or adequate thermal ratings are recommended for new designs.

Q: Are all listed substitutes ROHS3 compliant? A: Yes. All parts in this reference are ROHS3 compliant. Active parts (ECE-A1HKS2R2, ECE-A1HKS2R2B, EEA-GA1H2R2, ECE-A1HKA2R2, SK2R2M050ST) also carry REACH certification, confirming full regulatory compliance for both EU and global markets.

Q: Do substitute parts have identical ripple current ratings? A: Ripple current specifications vary. SS2R2M050ST is rated at 19 mA @ 120 Hz (low frequency) and 21.85 mA @ 1 kHz (high frequency). Panasonic alternatives (ECE-A1HKS2R2, ECE-A1HKA2R2, EEA-GA1H2R2) specify 16–18 mA @ 120 Hz and higher frequency ratings up to 27.9 mA @ 100 kHz. These differences reflect design optimization across manufacturers and do not preclude substitution in general-purpose applications rated within the specified ranges.

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