EKY-250ETD331MJC5S Equivalent & Substitute Parts

Part Overview

The EKY-250ETD331MJC5S is a 330 µF, 25 V aluminum electrolytic capacitor manufactured by Chemi-Con in the KY series. This radial, through-hole component is rated for 7000 hours at 105°C and is designed for general-purpose applications. The part is currently in active production status with 1099 units in stock.

Substitute parts are necessary when the original manufacturer discontinues production, when alternative sourcing improves supply chain resilience, or when design requirements permit higher voltage ratings or extended operational lifetimes. The following equivalent and substitute parts maintain the core electrical and mechanical specifications while offering alternatives from established manufacturers including Rubycon, Würth Elektronik, and Nichicon.

Key Parameters

Parameter	Value	Unit
Capacitance	330	µF
Voltage - Rated	25	V
Tolerance	±20%	—
Lifetime @ Temperature	7000	Hrs @ 105°C
Operating Temperature Range	-40 to 105	°C
Lead Spacing	5.00	mm
Size / Diameter	10.00	mm
Height - Seated (Max)	14.00	mm
Mounting Type	Through Hole	—
Package / Case	Radial, Can	—
Polarization	Polar	—

Substitute Part Grouping Explanation

Substitution eligibility is determined by strict adherence to the following parameters:

Primary Substitution Criteria (Must Match):

Capacitance: 330 µF
Tolerance: ±20%
Lead Spacing: 5.00 mm (0.197")
Size / Diameter: 10.00 mm (0.394")
Height - Seated (Max): 14.00 mm (0.551")
Mounting Type: Through Hole
Package / Case: Radial, Can
Polarization: Polar

Secondary Substitution Criteria (Allowable Variations):

Voltage - Rated: 25 V or higher (higher voltage ratings are backward compatible)
Lifetime @ Temperature: 7000 Hrs @ 105°C or longer
Operating Temperature Range: -40°C to 105°C minimum
Impedance: Variations permitted based on manufacturer design
Ripple Current: Variations permitted based on manufacturer design

Substitute parts are grouped into two categories:

Upgrade Substitutes: Parts with improved electrical performance (higher voltage rating or extended lifetime) while maintaining identical physical dimensions and mounting characteristics.

Parametric Equivalents: Parts with identical electrical specifications (330 µF, 25 V, 7000 Hrs @ 105°C) and identical physical dimensions, sourced from alternative manufacturers.

Parameter Comparison

Manufacturer Part Number	Manufacturer	Series	Capacitance (µF)	Voltage (V)	Lifetime @ 105°C (Hrs)	Impedance (mOhms)	Product Status	Inventory (Pcs)
EKY-250ETD331MJC5S	Chemi-Con	KY	330	25	7000	80	Active	1099
35ZLH330MEFCT810X12.5	Rubycon	ZLH	330	35	10000	39	Active	203963
860160475020	Würth Elektronik	WCAP-ATLL	330	25	7000	240	Active	1361
25YXF330MEFCT810X12.5	Rubycon	YXF	330	25	7000	160	Not For New Designs	2184
25YXH330MEFCT810X12.5	Rubycon	YXH	330	25	7000	80	Last Time Buy	5430
860040475006	Würth Elektronik	WCAP-ATUL	330	25	7000	82	Active	1108
UHE1E331MPD6TD	Nichicon	UHE	330	25	7000	80	Not For New Designs	4523

Engineering Selection Recommendations

For Active Production Designs:

Select from parts with Active product status:

35ZLH330MEFCT810X12.5 (Rubycon ZLH): Upgrade substitute offering 35 V rating and 10000 Hrs @ 105°C lifetime. Lower impedance (39 mOhms) provides superior high-frequency ripple current performance (1.33 A @ 100 kHz). Highest inventory availability (203963 units).
860160475020 (Würth Elektronik WCAP-ATLL): Parametric equivalent with identical 25 V rating and 7000 Hrs @ 105°C. Extended operating temperature range (-55°C to 105°C). Active status with 1361 units in stock.
860040475006 (Würth Elektronik WCAP-ATUL): Parametric equivalent with identical electrical specifications. Active status with 1108 units in stock.

For Existing Designs or Legacy Support:

Parts with Last Time Buy or Not For New Designs status are available for replacement or repair applications:

25YXH330MEFCT810X12.5 (Rubycon YXH): Last Time Buy status. Identical impedance (80 mOhms) to main part. Highest inventory among legacy parts (5430 units).
25YXF330MEFCT810X12.5 (Rubycon YXF): Not For New Designs status. Available for legacy applications.
UHE1E331MPD6TD (Nichicon UHE): Not For New Designs status. Identical impedance (80 mOhms) to main part. REACH Status: REACH Affected.

Compliance Considerations:

All listed parts are ROHS3 Compliant and REACH Unaffected, except UHE1E331MPD6TD which is REACH Affected. All parts carry ECCN: EAR99 classification.

Frequently Asked Questions (FAQ)

Q: Can I use a 35 V rated capacitor in place of a 25 V rated capacitor?

A: Yes. The 35ZLH330MEFCT810X12.5 (35 V rating) is a direct mechanical and electrical upgrade substitute for the EKY-250ETD331MJC5S (25 V rating). Higher voltage ratings are backward compatible in circuits designed for lower voltages. The capacitor will operate safely within the 25 V circuit while providing additional voltage margin and extended lifetime (10000 Hrs @ 105°C versus 7000 Hrs @ 105°C).

Q: What is the difference between "Upgrade Substitutes" and "Parametric Equivalents"?

A: Upgrade Substitutes offer improved performance characteristics (higher voltage rating or longer operational lifetime) while maintaining identical physical dimensions. Parametric Equivalents match the original part's electrical specifications exactly and are sourced from alternative manufacturers. Both categories maintain identical lead spacing, diameter, height, and mounting type.

Q: Are all substitute parts physically interchangeable with the original EKY-250ETD331MJC5S?

A: Yes. All listed substitute parts share identical physical dimensions: 10.00 mm diameter, 14.00 mm maximum seated height, and 5.00 mm lead spacing. All are through-hole radial can packages suitable for PCB mounting in the same footprint.

Q: Which substitute part has the lowest impedance?

A: The 35ZLH330MEFCT810X12.5 (Rubycon ZLH) has the lowest impedance at 39 mOhms, compared to 80 mOhms for the original part. Lower impedance results in reduced voltage drop across the capacitor at high ripple currents.

Q: What does "Last Time Buy" product status mean?

A: Last Time Buy indicates the manufacturer will discontinue production after a specified date. The 25YXH330MEFCT810X12.5 is available for purchase but should not be selected for new designs. It is suitable for replacement or repair of existing equipment.

Q: Can I use parts marked "Not For New Designs" in new product development?

A: No. Parts with "Not For New Designs" status (25YXF330MEFCT810X12.5 and UHE1E331MPD6TD) should be used only for replacement, repair, or legacy support applications. For new designs, select from parts with Active product status.

Q: What is the difference between the two Würth Elektronik parts (860160475020 and 860040475006)?

A: Both are parametric equivalents with identical electrical specifications (330 µF, 25 V, 7000 Hrs @ 105°C). The 860160475020 (WCAP-ATLL series) has extended operating temperature range (-55°C to 105°C) and higher impedance (240 mOhms). The 860040475006 (WCAP-ATUL series) has standard operating temperature range (-40°C to 105°C) and lower impedance (82 mOhms). Selection depends on specific temperature requirements.

Q: Are there any REACH compliance concerns with these substitutes?

A: The UHE1E331MPD6TD (Nichicon UHE) is marked as REACH Affected. All other substitute parts are REACH Unaffected. For applications requiring REACH compliance, avoid UHE1E331MPD6TD and select from the remaining alternatives.

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