ESK226M025AC3AA Equivalent & Substitute Parts

Part Overview

The ESK226M025AC3AA is a 22 µF, 25 V aluminum electrolytic capacitor in radial configuration manufactured by KEMET. This component is rated for 2000 hours at 85°C and is designed for general-purpose applications requiring through-hole mounting. The part is currently active in production with 943 units in stock.

Substitute parts are necessary when the original component becomes unavailable, when design requirements demand enhanced thermal performance, higher voltage ratings, or extended operational lifetime. Alternative manufacturers and upgraded series within the same footprint provide equivalent electrical functionality while accommodating specific application constraints.

Key Parameters

Parameter	Value	Unit
Capacitance	22	µF
Voltage Rating	25	V
Tolerance	±20%	—
Lifetime @ Temperature	2000 Hrs @ 85°C	—
Operating Temperature Range	-40°C to 85°C	—
Lead Spacing	0.079" (2.00 mm)	—
Case Diameter	0.197" (5.00 mm)	—
Height (Seated Max)	0.492" (12.50 mm)	—
Mounting Type	Through Hole	—
Package Type	Radial, Can	—
RoHS Status	ROHS3 Compliant	—

Substitute Part Grouping Explanation

Substitution of the ESK226M025AC3AA is determined by strict equivalence in the following parameters:

Critical Parameters (Must Match):

Capacitance: 22 µF
Voltage Rating: 25 V minimum
Tolerance: ±20%
Polarization: Polar
Lead Spacing: 0.079" (2.00 mm)
Case Diameter: 0.197" (5.00 mm)
Mounting Type: Through Hole
Package Type: Radial, Can

Allowable Variations:

Operating Temperature Range: May extend beyond -40°C to 85°C
Lifetime @ Temperature: May exceed 2000 Hrs @ 85°C
Voltage Rating: May exceed 25 V (higher voltage provides design margin)
Height: Minor variations acceptable within PCB layout constraints
Ripple Current: May vary based on series design

Substitute parts are grouped into two categories:

Direct Substitutes (Same Voltage, Same or Better Thermal Performance):

ESH226M025AC3AA (KEMET): Same 25 V rating, improved to 2000 Hrs @ 105°C
ECA-1EM220 (Panasonic): Same 25 V rating, 2000 Hrs @ 85°C
SK220M025ST (Cornell Dubilier): Same 25 V rating, 2000 Hrs @ 85°C
UPS1E220MDD (Nichicon): Same 25 V rating, 2000 Hrs @ 105°C (Obsolete status)

Upgrade Substitutes (Higher Voltage Rating for Enhanced Margin):

ESH226M035AC3AA (KEMET): 35 V rating, 2000 Hrs @ 105°C
ESH226M050AC3AA (KEMET): 50 V rating, 2000 Hrs @ 105°C
ESK226M050AC3AA (KEMET): 50 V rating, 2000 Hrs @ 85°C
226CKH050M (Cornell Dubilier): 50 V rating, 2000 Hrs @ 105°C
226CKR050M (Cornell Dubilier): 50 V rating, 2000 Hrs @ 85°C
226KBM050M (Cornell Dubilier): 50 V rating, 5000 Hrs @ 105°C

Parameter Comparison

Part Number	Manufacturer	Capacitance (µF)	Voltage (V)	Tolerance	Lifetime @ Temp	Operating Temp (°C)	Height Max (mm)	Product Status
ESK226M025AC3AA	KEMET	22	25	±20%	2000 Hrs @ 85°C	-40 to 85	12.50	Active
ESH226M025AC3AA	KEMET	22	25	±20%	2000 Hrs @ 105°C	-40 to 105	12.50	Active
ECA-1EM220	Panasonic	22	25	±20%	2000 Hrs @ 85°C	-40 to 85	12.00	Active
SK220M025ST	Cornell Dubilier	22	25	±20%	2000 Hrs @ 85°C	-40 to 85	13.00	Active
UPS1E220MDD	Nichicon	22	25	±20%	2000 Hrs @ 105°C	-55 to 105	12.50	Obsolete
ESH226M035AC3AA	KEMET	22	35	±20%	2000 Hrs @ 105°C	-40 to 105	12.50	Active
ESH226M050AC3AA	KEMET	22	50	±20%	2000 Hrs @ 105°C	-40 to 105	12.50	Active
ESK226M050AC3AA	KEMET	22	50	±20%	2000 Hrs @ 85°C	-40 to 85	12.50	Active
226CKH050M	Cornell Dubilier	22	50	±20%	2000 Hrs @ 105°C	-40 to 105	12.50	Active
226CKR050M	Cornell Dubilier	22	50	±20%	2000 Hrs @ 85°C	-40 to 85	12.50	Active
226KBM050M	Cornell Dubilier	22	50	±20%	5000 Hrs @ 105°C	-40 to 105	12.50	Active

Engineering Selection Recommendations

For Direct Replacement (Same Electrical Specifications):

Select ESH226M025AC3AA when the original ESK226M025AC3AA is unavailable. Both components maintain 22 µF capacitance and 25 V rating with identical physical dimensions. The ESH series offers extended thermal performance at 2000 Hrs @ 105°C compared to the ESK series baseline of 2000 Hrs @ 85°C. Both are ROHS3 compliant and REACH unaffected.

ECA-1EM220 (Panasonic) and SK220M025ST (Cornell Dubilier) provide equivalent 25 V, 22 µF specifications with active product status. ECA-1EM220 has a slightly reduced height of 12.00 mm. SK220M025ST has a maximum height of 13.00 mm and should be evaluated for PCB clearance constraints.

UPS1E220MDD (Nichicon) is marked as obsolete and should not be selected for new designs, though it remains in inventory. This part offers 2000 Hrs @ 105°C performance but is no longer in active production.

For Voltage Margin Enhancement:

Select ESH226M035AC3AA or ESH226M050AC3AA when circuit design requires higher voltage headroom. Both maintain the 22 µF capacitance and identical physical footprint while providing 35 V and 50 V ratings respectively. Both are rated for 2000 Hrs @ 105°C with extended operating temperature to 105°C.

ESK226M050AC3AA provides 50 V rating with 2000 Hrs @ 85°C performance, maintaining the same thermal profile as the original part while offering voltage upgrade.

For Extended Lifetime Applications:

Select 226KBM050M (Cornell Dubilier) when applications require 5000 Hrs @ 105°C operational lifetime. This part provides 50 V rating with significantly extended thermal endurance. All dimensions remain compatible with the original footprint.

226CKH050M and 226CKR050M (Cornell Dubilier) offer 50 V ratings with 2000 Hrs lifetime at 105°C and 85°C respectively, providing intermediate options between standard and extended-life specifications.

Compliance Verification:

All recommended substitutes maintain ROHS3 compliance and REACH unaffected status. All parts are classified as EAR99 with HTSUS code 8532.22.0020. Moisture sensitivity level is not applicable for all listed components.

Frequently Asked Questions (FAQ)

Q: Can ESH226M025AC3AA directly replace ESK226M025AC3AA?

A: Yes. Both parts share identical capacitance (22 µF), voltage rating (25 V), tolerance (±20%), lead spacing (2.00 mm), case diameter (5.00 mm), and height (12.50 mm). The ESH series provides improved thermal performance at 2000 Hrs @ 105°C versus the ESK baseline of 2000 Hrs @ 85°C. Physical and electrical compatibility is confirmed.

Q: What is the difference between direct substitutes and upgrade substitutes?

A: Direct substitutes maintain the original 25 V voltage rating and provide equivalent or improved thermal performance. Upgrade substitutes increase the voltage rating to 35 V or 50 V while maintaining 22 µF capacitance. Upgrade substitutes provide additional design margin for voltage transients and are physically compatible with the original footprint.

Q: Can I use a 50 V rated capacitor in place of a 25 V rated capacitor?

A: Yes. A higher voltage rating is electrically compatible with circuits designed for lower voltage operation. The 50 V capacitor will function correctly in a 25 V circuit. However, verify that the physical dimensions, particularly height, do not exceed PCB layout constraints. ESH226M050AC3AA, ESK226M050AC3AA, 226CKH050M, 226CKR050M, and 226KBM050M all maintain the 12.50 mm height specification.

Q: Why is UPS1E220MDD marked as obsolete?

A: UPS1E220MDD is no longer in active production by Nichicon. Although inventory remains available (5994 units), this part should not be selected for new designs. Active alternatives from KEMET, Panasonic, and Cornell Dubilier provide equivalent or superior specifications with ongoing manufacturer support.

Q: What is the significance of lifetime rating at different temperatures?

A: Lifetime rating indicates the expected operational duration at a specified temperature. ESK226M025AC3AA is rated for 2000 Hrs @ 85°C, meaning the capacitor meets performance specifications for 2000 hours when operated at 85°C. ESH226M025AC3AA extends this to 2000 Hrs @ 105°C, indicating the same lifetime at a higher temperature. Extended lifetime ratings (such as 5000 Hrs @ 105°C for 226KBM050M) provide longer service life in thermally demanding applications.

Q: Are there height variations among substitute parts?

A: Yes. ECA-1EM220 has a maximum seated height of 12.00 mm, which is 0.50 mm shorter than the original ESK226M025AC3AA (12.50 mm). SK220M025ST has a maximum height of 13.00 mm, which is 0.50 mm taller. All other substitutes maintain the 12.50 mm height. Verify PCB layout clearance before selecting parts with different heights.

Q: Do all substitutes have the same ripple current ratings?

A: No. Ripple current varies by manufacturer and series design. The original ESK226M025AC3AA is rated for 90 mA @ 120 Hz and 135 mA @ 10 kHz. Substitute parts show variations: ECA-1EM220 specifies 153 mA @ 10 kHz; SK220M025ST specifies 90 mA @ 120 Hz; UPS1E220MDD specifies 27.2 mA @ 120 Hz and 160 mA @ 100 kHz. Verify ripple current specifications match application requirements.

Q: Are all substitutes RoHS3 compliant?

A: Yes. All listed substitute parts are ROHS3 compliant and REACH unaffected. All components are classified as EAR99 with HTSUS code 8532.22.0020, confirming regulatory alignment with the original ESK226M025AC3AA.

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