SN221M010ST Equivalent & Substitute Parts Reference

Part Overview

The SN221M010ST is a 220 µF, 10 V aluminum electrolytic capacitor in radial, can package manufactured by Cornell Dubilier Electronics (CDE). This component is classified as obsolete, making identification of suitable equivalent parts essential for ongoing system support and component procurement.

The SN221M010ST serves general-purpose applications requiring through-hole mounting with bi-polar polarization. Due to its obsolete status, alternative parts with compatible electrical and mechanical specifications are necessary to maintain design continuity and ensure supply chain availability.

Key Parameters

Parameter	Value
Capacitance	220 µF
Voltage - Rated	10 V
Tolerance	±20%
ESR @ 120 Hz	1.21 Ohm
Lifetime @ 85°C	1000 Hrs
Operating Temperature Range	-40°C ~ 85°C
Ripple Current @ 120 Hz	255 mA
Lead Spacing	0.197" (5.00 mm)
Case Diameter	0.394" (10.00 mm)
Height - Seated (Max)	0.630" (16.00 mm)
Mounting Type	Through Hole
Package / Case	Radial, Can
Polarization	Bi-Polar
RoHS Status	ROHS3 Compliant

Substitute Part Grouping Explanation

Substitution of the SN221M010ST is determined by strict adherence to the following electrical and mechanical parameters:

Electrical Compatibility Criteria:

Capacitance value must equal 220 µF
Tolerance must be ±20%
Voltage rating must be equal to or greater than 10 V
Operating temperature range must encompass -40°C ~ 85°C
Polarization must be bi-polar

Mechanical Compatibility Criteria:

Lead spacing must equal 0.197" (5.00 mm)
Case diameter must equal 0.394" (10.00 mm)
Height - seated (max) must equal 0.630" (16.00 mm)
Mounting type must be through hole
Package / case must be radial, can

Compliance Criteria:

RoHS3 compliance required

The ECE-A1EN221U from Panasonic Electronic Components meets all substitution criteria. This part maintains identical capacitance, tolerance, mechanical dimensions, and mounting configuration while providing a higher voltage rating (25 V) and extended lifetime specification (2000 Hrs @ 85°C).

Parameter Comparison

Parameter	SN221M010ST (CDE)	ECE-A1EN221U (Panasonic)
Manufacturer	Cornell Dubilier Electronics	Panasonic Electronic Components
Capacitance	220 µF	220 µF
Tolerance	±20%	±20%
Voltage - Rated	10 V	25 V
Operating Temperature Range	-40°C ~ 85°C	-40°C ~ 85°C
Lifetime @ 85°C	1000 Hrs	2000 Hrs
Ripple Current @ 120 Hz	255 mA	320 mA
Lead Spacing	0.197" (5.00 mm)	0.197" (5.00 mm)
Case Diameter	0.394" (10.00 mm)	0.394" (10.00 mm)
Height - Seated (Max)	0.630" (16.00 mm)	0.630" (16.00 mm)
Mounting Type	Through Hole	Through Hole
Package / Case	Radial, Can	Radial, Can
Polarization	Bi-Polar	Bi-Polar
RoHS Status	ROHS3 Compliant	ROHS3 Compliant
Product Status	Obsolete	Active

Engineering Selection Recommendations

The ECE-A1EN221U is a direct substitute for the SN221M010ST based on the following factors:

Electrical Equivalence: Both parts maintain identical capacitance (220 µF) and tolerance (±20%). The ECE-A1EN221U provides a higher voltage rating (25 V versus 10 V), which is compatible with circuits designed for 10 V operation and provides additional safety margin.

Mechanical Compatibility: Identical lead spacing (5.00 mm), case diameter (10.00 mm), and seated height (16.00 mm) ensure direct PCB footprint compatibility without layout modifications.

Reliability Enhancement: The ECE-A1EN221U offers extended lifetime (2000 Hrs @ 85°C versus 1000 Hrs), increased ripple current capability (320 mA @ 120 Hz versus 255 mA), and active product status ensuring long-term availability.

Compliance: Both parts maintain ROHS3 compliance, satisfying regulatory requirements for new designs and legacy system support.

Frequently Asked Questions (FAQ)

Q: Can the ECE-A1EN221U replace the SN221M010ST in existing designs?

A: Yes. The ECE-A1EN221U maintains identical capacitance, tolerance, and mechanical dimensions. The higher voltage rating (25 V) is compatible with 10 V circuit designs and does not require circuit modifications.

Q: Are there any mechanical differences between these parts?

A: No. Both parts share identical lead spacing (5.00 mm), case diameter (10.00 mm), and maximum seated height (16.00 mm), ensuring direct PCB compatibility.

Q: What is the significance of the higher voltage rating on the ECE-A1EN221U?

A: The 25 V rating on the ECE-A1EN221U provides additional voltage margin compared to the 10 V rating of the SN221M010ST. This does not affect operation in 10 V circuits and enhances component reliability.

Q: Does the ECE-A1EN221U meet the same compliance standards?

A: Yes. Both parts are ROHS3 compliant and carry identical ECCN (EAR99) and HTSUS (8532.22.0020) classifications.

Q: What is the advantage of the extended lifetime specification on the ECE-A1EN221U?

A: The ECE-A1EN221U specifies 2000 Hrs @ 85°C compared to 1000 Hrs for the SN221M010ST, indicating improved thermal stability and longer operational life under elevated temperature conditions.

Q: Are there differences in ripple current handling?

A: The ECE-A1EN221U supports higher ripple current (320 mA @ 120 Hz and 544 mA @ 10 kHz) compared to the SN221M010ST (255 mA @ 120 Hz), providing greater current capacity for demanding applications.

Q: Why is the SN221M010ST classified as obsolete?

A: Obsolete status indicates the part is no longer manufactured by Cornell Dubilier Electronics. The ECE-A1EN221U from Panasonic provides equivalent functionality with active product status and assured supply availability.

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