SEK221M010ST Equivalent & Substitute Parts

Part Overview

The SEK221M010ST is a 220 µF, 10 V aluminum electrolytic capacitor in radial, can package manufactured by Cornell Dubilier Electronics (CDE). This component is classified as Active product status and is designed for general-purpose applications requiring through-hole mounting. The capacitor features a 2000-hour lifetime rating at 105°C and operates across a temperature range of -55°C to 105°C.

Equivalent and substitute parts are necessary when the primary part becomes unavailable, when alternative manufacturers offer improved lead times, or when design requirements permit selection from qualified alternatives that meet the same electrical and mechanical specifications.

Key Parameters

Parameter	Value	Unit
Capacitance	220	µF
Voltage - Rated	10	V
Tolerance	±20%	-
Lifetime @ Temperature	2000	Hrs @ 105°C
Operating Temperature Range	-55 to 105	°C
Polarization	Polar	-
Lead Spacing	0.098 (2.50)	" (mm)
Size / Dimension	0.248 Dia (6.30)	" (mm)
Mounting Type	Through Hole	-
Package / Case	Radial, Can	-
RoHS Status	ROHS3 Compliant	-

Substitute Part Grouping Explanation

Substitution of aluminum electrolytic capacitors is determined by strict equivalence across the following parameters:

Critical Parameters (Must Match Exactly):

Capacitance: 220 µF
Voltage Rating: 10 V
Tolerance: ±20%
Polarization: Polar
Lifetime: 2000 Hrs @ 105°C
Operating Temperature Range: -55°C to 105°C
Lead Spacing: 0.098" (2.50 mm)
Size / Dimension: 0.248" Dia (6.30 mm)
Mounting Type: Through Hole
Package / Case: Radial, Can
RoHS Status: ROHS3 Compliant

Allowable Variations:

Height - Seated (Max): Variation permitted within mechanical envelope constraints
Ripple Current: Variation permitted; higher values indicate improved performance
ESR / Impedance: Variation permitted; lower values indicate improved performance
Manufacturer: Different manufacturers acceptable if all critical parameters match
Product Status: Both Active and Obsolete parts qualify as substitutes if electrical and mechanical parameters are equivalent
Applications: May differ (General Purpose vs. Automotive) without affecting substitution validity

All substitute parts listed meet the complete set of critical parameters and are therefore direct electrical and mechanical equivalents.

Parameter Comparison

Parameter	SEK221M010ST (CDE)	ELXY100ELL221MF15D (Chemi-Con)	ELXZ100ELL221MFB5D (Chemi-Con)	UPW1A221MED6 (Nichicon)	UPW1A221MED (Nichicon)
Capacitance	220 µF	220 µF	220 µF	220 µF	220 µF
Voltage - Rated	10 V	10 V	10 V	10 V	10 V
Tolerance	±20%	±20%	±20%	±20%	±20%
Lifetime @ Temp.	2000 Hrs @ 105°C	2000 Hrs @ 105°C	2000 Hrs @ 105°C	2000 Hrs @ 105°C	2000 Hrs @ 105°C
Operating Temperature	-55°C ~ 105°C	-55°C ~ 105°C	-55°C ~ 105°C	-55°C ~ 105°C	-55°C ~ 105°C
Polarization	Polar	Polar	Polar	Polar	Polar
Lead Spacing	0.098" (2.50 mm)	0.098" (2.50 mm)	0.098" (2.50 mm)	0.098" (2.50 mm)	0.098" (2.50 mm)
Size / Dimension	0.248" Dia (6.30 mm)	0.248" Dia (6.30 mm)	0.248" Dia (6.30 mm)	0.248" Dia (6.30 mm)	0.248" Dia (6.30 mm)
Height - Seated (Max)	0.433" (11.00 mm)	0.650" (16.50 mm)	0.512" (13.00 mm)	0.591" (15.00 mm)	0.433" (11.00 mm)
Mounting Type	Through Hole	Through Hole	Through Hole	Through Hole	Through Hole
Package / Case	Radial, Can	Radial, Can	Radial, Can	Radial, Can	Radial, Can
RoHS Status	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant
Product Status	Active	Active	Active	Obsolete	Obsolete
ESR @ 120 Hz	1.33 Ohm	-	-	-	-
Impedance	-	250 mOhms	250 mOhms	230 mOhms	250 mOhms
Ripple Current @ 120 Hz	180 mA	195 mA	145 mA	279.5 mA	188.5 mA
Ripple Current @ High Frequency	216 mA @ 10 kHz	390 mA @ 100 kHz	290 mA @ 100 kHz	430 mA @ 100 kHz	290 mA @ 100 kHz

Engineering Selection Recommendations

Active Product Status Parts:

ELXY100ELL221MF15D (Chemi-Con LXY Series) and ELXZ100ELL221MFB5D (Chemi-Con LXZ Series) maintain Active product status and are recommended for new designs. Both parts carry AEC-Q200 automotive qualification ratings and ROHS3 compliance. The ELXZ100ELL221MFB5D offers a height of 0.512" (13.00 mm), which provides closer dimensional alignment to the SEK221M010ST at 0.433" (11.00 mm) compared to the ELXY100ELL221MF15D at 0.650" (16.50 mm). Selection between these two should be based on available board space and mechanical envelope constraints.

Obsolete Product Status Parts:

UPW1A221MED6 and UPW1A221MED (Nichicon UPW Series) are classified as Obsolete. These parts remain electrically and mechanically equivalent to the SEK221M010ST and are suitable for replacement applications or repair scenarios where existing inventory exists. The UPW1A221MED offers identical height specification (0.433" / 11.00 mm) to the primary part, while UPW1A221MED6 measures 0.591" (15.00 mm) in height.

Compliance Considerations:

All substitute parts are ROHS3 compliant and REACH unaffected, matching the regulatory status of the SEK221M010ST. Selection should prioritize Active status parts for new production applications to ensure long-term availability and manufacturer support.

Frequently Asked Questions (FAQ)

Q: Can ELXY100ELL221MF15D be used as a direct replacement for SEK221M010ST?

A: Yes. ELXY100ELL221MF15D is a direct electrical and mechanical equivalent. Both parts share identical capacitance (220 µF), voltage rating (10 V), tolerance (±20%), operating temperature range (-55°C to 105°C), lifetime rating (2000 Hrs @ 105°C), lead spacing (0.098" / 2.50 mm), and can diameter (0.248" / 6.30 mm). The primary difference is height: ELXY100ELL221MF15D measures 0.650" (16.50 mm) versus SEK221M010ST at 0.433" (11.00 mm). Verify available board space before substitution.

Q: What is the difference between ELXZ100ELL221MFB5D and ELXY100ELL221MF15D?

A: Both are Chemi-Con 220 µF, 10 V radial aluminum electrolytic capacitors with identical electrical specifications. The primary difference is physical height: ELXZ100ELL221MFB5D measures 0.512" (13.00 mm) while ELXY100ELL221MF15D measures 0.650" (16.50 mm). ELXZ100ELL221MFB5D provides a more compact form factor and may be preferred when board space is limited.

Q: Why are UPW1A221MED and UPW1A221MED6 listed as Obsolete?

A: Product status reflects manufacturer availability and production status. Obsolete designation indicates these parts are no longer in active production by Nichicon. However, they remain electrically and mechanically equivalent to SEK221M010ST and may be available through existing inventory channels. For new designs, Active status parts (ELXY100ELL221MF15D or ELXZ100ELL221MFB5D) are recommended.

Q: Are there height restrictions for substitution?

A: Height variation is permitted within mechanical envelope constraints of the application. SEK221M010ST measures 0.433" (11.00 mm). Substitute parts range from 0.433" to 0.650" in height. Verify that the selected substitute fits within available board space and does not interfere with adjacent components or enclosure constraints.

Q: Do all substitute parts have the same ripple current rating?

A: No. Ripple current specifications vary among substitutes. SEK221M010ST specifies 180 mA @ 120 Hz and 216 mA @ 10 kHz. Substitute parts range from 145 mA to 279.5 mA @ 120 Hz. Higher ripple current ratings indicate improved performance capability. All listed substitutes meet or exceed the minimum ripple current requirements for equivalent operation.

Q: What is the significance of AEC-Q200 rating on Chemi-Con parts?

A: AEC-Q200 is an automotive qualification standard. ELXY100ELL221MF15D and ELXZ100ELL221MFB5D carry this certification, indicating qualification for automotive applications. SEK221M010ST does not list this rating but is designated for general-purpose applications. Both ratings are acceptable for substitution; AEC-Q200 certification provides additional assurance for demanding environments.

Q: Can I substitute based on impedance values alone?

A: No. Impedance is a performance characteristic but not a substitution criterion. All listed parts must match critical parameters: capacitance, voltage rating, tolerance, operating temperature range, lifetime rating, lead spacing, can diameter, and mounting type. Impedance and ripple current variations are acceptable provided all critical parameters align.

Q: Is RoHS compliance status identical across all parts?

A: Yes. SEK221M010ST and all listed substitutes are ROHS3 compliant and REACH unaffected. Regulatory compliance is consistent across the entire substitute group.

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