EKMQ250ELL331MHB5D Equivalent & Substitute Parts

Part Overview

The EKMQ250ELL331MHB5D is a 330 µF, 25 V aluminum electrolytic capacitor manufactured by Chemi-Con in the KMQ series. This radial, through-hole component is rated for 1000 hours at 105°C and is designed for general-purpose applications. The part is currently active and in production.

Substitute parts become necessary when the primary component experiences extended lead times, inventory constraints, or when design requirements call for enhanced performance characteristics such as extended lifetime ratings or improved ripple current handling.

Key Parameters

Parameter	Value
Capacitance	330 µF
Voltage Rating	25 V
Tolerance	±20%
Lifetime @ Temperature	1000 Hrs @ 105°C
Operating Temperature Range	-55°C ~ 105°C
Polarization	Polar
Mounting Type	Through Hole
Package Type	Radial, Can
Lead Spacing	0.138" (3.50 mm)
Case Diameter	0.315" (8.00 mm)
RoHS Status	ROHS3 Compliant

Substitute Part Grouping Explanation

Substitution eligibility for the EKMQ250ELL331MHB5D is determined by the following critical parameters:

Mandatory Matching Parameters:

Capacitance: 330 µF
Voltage Rating: 25 V
Tolerance: ±20%
Polarization: Polar
Mounting Type: Through Hole
Package Type: Radial, Can
Lead Spacing: 0.138" (3.50 mm)
Case Diameter: 0.315" (8.00 mm)
Operating Temperature Range: -55°C ~ 105°C
RoHS3 Compliance

Allowable Variation Parameters:

Lifetime @ 105°C: Equal or greater than 1000 hours
Height (Seated): Within mechanical envelope constraints
Ripple Current: Equal or greater than specified values
Application Category: General Purpose or Audio

All substitute parts listed meet or exceed the mandatory parameters. Variations in lifetime rating and ripple current represent performance enhancements rather than deviations from specification.

Parameter Comparison

Parameter	EKMQ250ELL331MHB5D (Chemi-Con)	ECA-1EHG331 (Panasonic)	UKA1E331MPD (Nichicon)	25PX330MEFC8X11.5 (Rubycon)	UVY1E331MPD (Nichicon)
Manufacturer	Chemi-Con	Panasonic Electronic Components	Nichicon	Rubycon	Nichicon
Series	KMQ	NHG-A	UKA	PX	UVY
Capacitance	330 µF	330 µF	330 µF	330 µF	330 µF
Voltage Rating	25 V	25 V	25 V	25 V	25 V
Tolerance	±20%	±20%	±20%	±20%	±20%
Lifetime @ 105°C	1000 Hrs	1000 Hrs	2000 Hrs	1000 Hrs	1000 Hrs
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
Mounting Type	Through Hole	Through Hole	Through Hole	Through Hole	Through Hole
Package Type	Radial, Can	Radial, Can	Radial, Can	Radial, Can	Radial, Can
Lead Spacing	0.138" (3.50 mm)	0.138" (3.50 mm)	0.138" (3.50 mm)	0.138" (3.50 mm)	0.138" (3.50 mm)
Case Diameter	0.315" (8.00 mm)	0.315" (8.00 mm)	0.315" (8.00 mm)	0.315" (8.00 mm)	0.315" (8.00 mm)
Height (Seated Max)	0.512" (13.00 mm)	0.492" (12.50 mm)	0.512" (13.00 mm)	0.512" (13.00 mm)	0.512" (13.00 mm)
Ripple Current @ 120 Hz	310 mA	310 mA	290 mA	335 mA	275 mA
Ripple Current @ High Frequency	465 mA @ 100 kHz	465 mA @ 100 kHz	435 mA @ 10 kHz	Not Specified	412.5 mA @ 10 kHz
RoHS Status	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant
Product Status	Active	Active	Not For New Designs	Active	Not For New Designs

Engineering Selection Recommendations

Direct Equivalent (Preferred for New Designs):

ECA-1EHG331 (Panasonic Electronic Components) is the recommended direct substitute. This part maintains identical electrical specifications to the EKMQ250ELL331MHB5D, including 1000-hour lifetime at 105°C and matching ripple current ratings. The ECA-1EHG331 is an active product with full production support. The only dimensional difference is a 0.020" (0.50 mm) reduction in seated height, which remains within standard through-hole PCB design tolerances. This part is ROHS3 compliant and suitable for new design implementations.

Performance-Enhanced Alternative:

UKA1E331MPD (Nichicon) provides a 2000-hour lifetime rating at 105°C, doubling the operational life of the primary component. This upgrade is applicable to designs requiring extended service intervals or higher reliability margins. However, this part carries a "Not For New Designs" status, limiting its use to legacy system support or retrofit applications. The UKA1E331MPD maintains identical mechanical compatibility and RoHS3 compliance.

Parametric Equivalents (Active Production):

25PX330MEFC8X11.5 (Rubycon) and UVY1E331MPD (Nichicon) are parametric equivalents with active or legacy status. The Rubycon part offers enhanced ripple current capability at 335 mA @ 120 Hz. The Nichicon UVY1E331MPD is marked "Not For New Designs" and should be reserved for existing system maintenance only.

Selection Criteria:

For new designs, select ECA-1EHG331. For systems requiring extended lifetime, select UKA1E331MPD if design freeze permits legacy components. For active production alternatives, select 25PX330MEFC8X11.5. All parts are ROHS3 compliant and suitable for the specified operating temperature range.

Frequently Asked Questions (FAQ)

Q: Can ECA-1EHG331 be used as a direct replacement for EKMQ250ELL331MHB5D?

A: Yes. The ECA-1EHG331 meets all mandatory electrical and mechanical parameters. The 0.020" height difference (12.50 mm vs. 13.00 mm) is within standard PCB design tolerances for through-hole components and does not affect circuit functionality.

Q: What is the difference between the main part and UKA1E331MPD?

A: The UKA1E331MPD provides double the lifetime rating (2000 hours vs. 1000 hours at 105°C). Both parts share identical capacitance, voltage, tolerance, and mechanical specifications. The UKA1E331MPD carries a "Not For New Designs" status, restricting its use to legacy applications.

Q: Are all substitute parts RoHS3 compliant?

A: Yes. All listed substitute parts are ROHS3 compliant, matching the compliance status of the EKMQ250ELL331MHB5D.

Q: Which substitute part has the highest ripple current rating?

A: The 25PX330MEFC8X11.5 (Rubycon) provides the highest ripple current at 335 mA @ 120 Hz, compared to 310 mA for the primary part.

Q: Can parts marked "Not For New Designs" be used in new applications?

A: Parts with "Not For New Designs" status (UKA1E331MPD and UVY1E331MPD) should be reserved for legacy system support, maintenance, and retrofit applications. For new designs, select ECA-1EHG331 or 25PX330MEFC8X11.5.

Q: Do all substitute parts fit the same PCB footprint?

A: Yes. All substitute parts maintain identical lead spacing (0.138" / 3.50 mm) and case diameter (0.315" / 8.00 mm). The ECA-1EHG331 has a 0.020" shorter seated height, which does not affect footprint compatibility on standard through-hole PCBs.

Q: What is the operating temperature range for all parts?

A: All parts operate across the identical temperature range of -55°C to 105°C.

Q: Are there inventory considerations when selecting a substitute?

A: Inventory levels vary by part. Verify current stock availability with your supplier before final component selection, particularly for parts marked "Not For New Designs."

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