SN221M016ST Equivalent & Substitute Parts

Part Overview

The SN221M016ST is a 220 µF, 16 V aluminum electrolytic capacitor manufactured by Cornell Dubilier Electronics (CDE) in radial, through-hole configuration. This component is classified as obsolete, making equivalent substitutes necessary for ongoing design support and procurement. The part operates across a temperature range of -40°C to 85°C with a rated lifetime of 1000 hours at 85°C, suitable for general-purpose applications requiring stable capacitance and low equivalent series resistance.

Substiute Parts

SN221M016ST

Cornell Dubilier Electronics (CDE)In Stock: 1184SN221M016ST Datasheet

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ECE-A1EN221U

Panasonic Electronic ComponentsIn Stock: 9912ECE-A1EN221U Datasheet

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Key Parameters

Substitute Part Grouping Explanation

Substitution of the SN221M016ST is determined by strict alignment of the following electrical and mechanical parameters:

Electrical Compatibility Criteria:

• Capacitance value: 220 µF (exact match required)
• Tolerance: ±20% (matching tolerance band)
• Voltage rating: Substitute must equal or exceed 16 V
• Operating temperature range: -40°C to 85°C (minimum requirement)
• Polarization: Bi-polar configuration

Mechanical Compatibility Criteria:

• Lead spacing: 5.00 mm (0.197")
• Package diameter: 10.00 mm (0.394")
• Mounting type: Through-hole radial configuration
• Package case: Radial, can format

Compliance Requirements:

• RoHS3 compliance mandatory
• ECCN and HTSUS classifications aligned

The ECE-A1EN221U from Panasonic Electronic Components satisfies all substitution criteria. This part maintains identical capacitance, tolerance, lead spacing, and diameter specifications while providing a higher voltage rating (25 V) and extended lifetime rating (2000 Hrs @ 85°C), ensuring functional compatibility in the SN221M016ST application space.

Parameter Comparison

Engineering Selection Recommendations

The ECE-A1EN221U qualifies as a direct substitute for the SN221M016ST based on the following engineering criteria:

Electrical Equivalence: Both components maintain 220 µF capacitance with ±20% tolerance and operate across -40°C to 85°C. The ECE-A1EN221U's 25 V rating exceeds the 16 V requirement, providing additional voltage margin without affecting circuit performance in applications designed for 16 V operation.

Mechanical Compatibility: Lead spacing (5.00 mm), package diameter (10.00 mm), and through-hole radial configuration are identical. The ECE-A1EN221U height of 16.00 mm is 4.00 mm shorter than the original 20.00 mm, reducing board space requirements without compromising electrical function.

Reliability Enhancement: The ECE-A1EN221U provides 2000-hour lifetime at 85°C compared to the SN221M016ST's 1000-hour rating, doubling the thermal endurance specification.

Compliance Alignment: Both components are ROHS3 compliant with matching ECCN (EAR99) and HTSUS (8532.22.0020) classifications, ensuring regulatory consistency.

Procurement Advantage: The ECE-A1EN221U maintains active product status with 9874 units in stock, ensuring long-term availability compared to the obsolete SN221M016ST.

Frequently Asked Questions (FAQ)

Q: Can the ECE-A1EN221U replace the SN221M016ST in existing designs without modification?

A: Yes. The ECE-A1EN221U maintains identical capacitance (220 µF), tolerance (±20%), lead spacing (5.00 mm), diameter (10.00 mm), and mounting configuration (through-hole radial). The higher voltage rating (25 V vs. 16 V) and extended lifetime (2000 Hrs vs. 1000 Hrs @ 85°C) provide enhanced performance margins. The reduced height (16.00 mm vs. 20.00 mm) may improve board layout but does not affect electrical compatibility.

Q: What are the key parameters that determine substitution eligibility?

A: Substitution eligibility is determined by: capacitance value (220 µF exact), tolerance band (±20%), voltage rating (equal or exceeding 16 V), operating temperature range (-40°C to 85°C minimum), lead spacing (5.00 mm), package diameter (10.00 mm), mounting type (through-hole), package format (radial can), and RoHS3 compliance. Deviations in any of these parameters disqualify a component as a direct substitute.

Q: Does the ECE-A1EN221U's higher voltage rating affect circuit operation?

A: No. A capacitor with higher voltage rating operates identically to one with lower voltage rating in the same circuit. The 25 V rating of the ECE-A1EN221U provides additional safety margin and stress reduction compared to the 16 V SN221M016ST, improving reliability without altering electrical behavior.

Q: Are there height clearance considerations when substituting to the ECE-A1EN221U?

A: The ECE-A1EN221U is 4.00 mm shorter (16.00 mm vs. 20.00 mm maximum height). This reduction improves board clearance and may enable more compact layouts. No design modification is required; the shorter height is a benefit for space-constrained applications.

Q: What is the ripple current difference between these components?

A: The SN221M016ST specifies 330 mA ripple current at 120 Hz, while the ECE-A1EN221U specifies 320 mA at 120 Hz. This 10 mA difference is negligible for general-purpose applications. The ECE-A1EN221U additionally provides 544 mA ripple current capability at 10 kHz, offering superior high-frequency performance.

Q: Why is the SN221M016ST obsolete?

A: The SN221M016ST is classified as obsolete by Cornell Dubilier Electronics. The ECE-A1EN221U from Panasonic maintains active product status with established supply chains, ensuring long-term availability and design continuity.

Q: Are both components RoHS3 compliant?

A: Yes. Both the SN221M016ST and ECE-A1EN221U are ROHS3 compliant, meeting environmental and regulatory requirements for electronic component manufacturing and use.