EKMM451VSN331MA40S Equivalent & Substitute Parts

Part Overview

The EKMM451VSN331MA40S is a 330 µF, 450 V aluminum electrolytic capacitor manufactured by Chemi-Con in the KMM series. This radial, can-style snap-in component is designed for general-purpose applications requiring high voltage energy storage and filtering. The part features a 3000-hour lifetime rating at 105°C and operates across a temperature range of -25°C to 105°C.

Equivalent and substitute parts are necessary when the original component becomes unavailable, when design requirements demand extended operational life, or when alternative manufacturers' components meet identical electrical and mechanical specifications. This reference provides direct equivalents and parametric alternatives that maintain compatibility with the original design envelope.

Key Parameters

Parameter	Value	Unit
Capacitance	330	µF
Voltage - Rated	450	V
Tolerance	±20%	-
Lifetime @ Temperature	3000	Hrs @ 105°C
Operating Temperature Range	-25°C to 105°C	-
Lead Spacing	0.394" (10.00 mm)	-
Diameter	1.378" (35.00 mm)	-
Height - Seated (Max)	1.654" (42.00 mm)	-
Mounting Type	Through Hole	-
Package / Case	Radial, Can - Snap-In	-
Polarization	Polar	-
Applications	General Purpose	-

Substitute Part Grouping Explanation

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

Critical Parameters (Must Match Exactly):

Capacitance: 330 µF
Voltage - Rated: 450 V
Tolerance: ±20%
Lead Spacing: 0.394" (10.00 mm)
Diameter: 1.378" (35.00 mm)
Mounting Type: Through Hole
Package / Case: Radial, Can - Snap-In
Polarization: Polar

Allowable Variation Parameters:

Height - Seated (Max): Substitutes may vary within mechanical envelope constraints
Lifetime @ Temperature: Substitutes may exceed the 3000-hour specification
Operating Temperature Range: Substitutes may extend the lower temperature limit
ESR (Equivalent Series Resistance): Substitutes may differ based on manufacturer design
Ripple Current: Substitutes may differ based on manufacturer specifications

All substitute parts listed maintain identical electrical ratings (330 µF, 450 V, ±20%) and mechanical compatibility (through-hole, snap-in radial can, 10 mm lead spacing, 35 mm diameter). Variations in height, lifetime, and ESR do not affect functional interchangeability in the original application.

Parameter Comparison

Manufacturer Part Number	Manufacturer	Series	Capacitance (µF)	Voltage (V)	Tolerance	Lifetime @ 105°C (Hrs)	Height - Seated Max (mm)	Product Status	RoHS Status
EKMM451VSN331MA40S	Chemi-Con	KMM	330	450	±20%	3000	42.00	Active	RoHS Compliant
ETXH451VSN331MA40S	Chemi-Con	TXH	330	450	±20%	10000	42.00	Active	RoHS Compliant
450VXG330MEFCSN35X35	Rubycon	VXG	330	450	±20%	5000	37.00	Active	ROHS3 Compliant
450VXK330MEFCSN35X30	Rubycon	VXK	330	450	±20%	5000	32.00	Active	ROHS3 Compliant
B43504B5337M000	EPCOS - TDK Electronics	B43504	330	450	±20%	3000	42.00	Not For New Designs	ROHS3 Compliant
B43509B5337M000	EPCOS - TDK Electronics	B43509	330	450	±20%	3000	42.00	Active	ROHS3 Compliant
LGU2W331MELC	Nichicon	LGU	330	450	±20%	3000	40.00	Active	ROHS3 Compliant
LGW2W331MELC35	Nichicon	LGW	330	450	±20%	3000	35.00	Active	ROHS3 Compliant
MAL215957331E3	Vishay Beyschlag/Draloric/BC Components	159 PUL-SI	330	450	±20%	5000	42.00	Active	ROHS3 Compliant
381LR331M450A042	Cornell Dubilier Electronics (CDE)	381LR	330	450	±20%	3000	42.00	Active	ROHS3 Compliant
381LX331M450A042	Cornell Dubilier Electronics (CDE)	381LX	330	450	±20%	3000	42.00	Active	ROHS3 Compliant

Engineering Selection Recommendations

For Direct Replacement (Identical Specifications):

The following parts maintain identical electrical and mechanical specifications to the EKMM451VSN331MA40S and are suitable for direct substitution:

LGU2W331MELC (Nichicon): Active product status, ROHS3 compliant, 3000-hour lifetime, 40 mm seated height (within tolerance of 42 mm maximum)
LGW2W331MELC35 (Nichicon): Active product status, ROHS3 compliant, 3000-hour lifetime, 35 mm seated height (reduced height variant)
381LR331M450A042 (Cornell Dubilier Electronics): Active product status, ROHS3 compliant, 3000-hour lifetime, 42 mm seated height
381LX331M450A042 (Cornell Dubilier Electronics): Active product status, ROHS3 compliant, 3000-hour lifetime, 42 mm seated height
B43509B5337M000 (EPCOS - TDK Electronics): Active product status, ROHS3 compliant, 3000-hour lifetime, 42 mm seated height

For Extended Lifetime Applications:

ETXH451VSN331MA40S (Chemi-Con): Same manufacturer as original, 10000-hour lifetime at 105°C (3.3× longer operational life), identical mechanical envelope
450VXG330MEFCSN35X35 (Rubycon): 5000-hour lifetime, 37 mm seated height (5 mm reduction from original)
450VXK330MEFCSN35X30 (Rubycon): 5000-hour lifetime, 32 mm seated height (10 mm reduction from original, compact variant)
MAL215957331E3 (Vishay Beyschlag/Draloric/BC Components): 5000-hour lifetime, 42 mm seated height (matches original height)

Parts Not Recommended for New Designs:

B43504B5337M000 (EPCOS - TDK Electronics): Product status is "Not For New Designs." This part is functionally equivalent but should not be selected for new circuit designs.

Compliance Considerations:

All listed substitute parts maintain RoHS compliance (either RoHS Compliant or ROHS3 Compliant) and REACH Unaffected status, consistent with the original component. All parts are classified under HTSUS 8532.22.0040 and ECCN EAR99.

Frequently Asked Questions (FAQ)

Q: Can I use a substitute part with a different seated height?

A: Yes. The EKMM451VSN331MA40S has a maximum seated height of 42.00 mm. Substitute parts with reduced heights (such as 40 mm, 37 mm, or 32 mm) are mechanically compatible and will fit within the original PCB footprint. Taller substitutes are not acceptable. Verify available board space before selecting compact variants.

Q: What is the difference between the Chemi-Con KMM and TXH series?

A: Both are manufactured by Chemi-Con with identical electrical ratings (330 µF, 450 V, ±20%). The primary difference is operational lifetime: KMM series provides 3000 hours at 105°C, while TXH series provides 10000 hours at 105°C. The TXH series is suitable for applications requiring extended service life without changing any other electrical or mechanical characteristics.

Q: Are all substitute parts ROHS3 compliant?

A: The original EKMM451VSN331MA40S is RoHS Compliant. Most substitute parts listed are ROHS3 Compliant, which represents a more recent compliance standard. Both compliance levels are acceptable for applications requiring RoHS adherence. The B43504B5337M000 is also ROHS3 Compliant but carries a "Not For New Designs" status.

Q: Can I substitute a part with higher ripple current rating?

A: Ripple current specifications vary among manufacturers due to design differences. All listed substitutes maintain the same 330 µF capacitance and 450 V voltage rating. Higher ripple current capability does not negatively affect circuit performance and may provide additional design margin. Verify that the substitute's ripple current meets or exceeds your application requirements.

Q: What does "Parametric Equivalent" mean?

A: Parametric equivalent parts (such as 381LR331M450A042 and 381LX331M450A042) maintain identical electrical ratings and mechanical form factors but may be manufactured by different companies using different internal designs. These parts are functionally interchangeable in the original application while meeting all critical specifications.

Q: Is the ETXH451VSN331MA40S a direct upgrade?

A: The ETXH451VSN331MA40S is manufactured by the same company (Chemi-Con) and maintains identical electrical and mechanical specifications to the EKMM451VSN331MA40S. The primary advantage is extended lifetime (10000 hours versus 3000 hours at 105°C). This represents a performance upgrade suitable for applications requiring longer operational life without any design modifications.

Q: Can I use the compact height variants (32 mm or 37 mm) in existing designs?

A: Yes. Compact height variants such as 450VXK330MEFCSN35X30 (32 mm) and 450VXG330MEFCSN35X35 (37 mm) are mechanically compatible with the original 42 mm design. These variants occupy less vertical space on the PCB and are suitable for space-constrained applications. Verify that the reduced height does not interfere with adjacent components or enclosure constraints.

Q: Why is B43504B5337M000 marked "Not For New Designs"?

A: The B43504B5337M000 is functionally equivalent to the EKMM451VSN331MA40S and maintains all critical specifications. However, EPCOS - TDK Electronics has designated this part as "Not For New Designs," indicating that the manufacturer recommends using alternative products for new circuit development. The B43509B5337M000 from the same manufacturer is the recommended active alternative.

Q: Are there differences in ESR (Equivalent Series Resistance) among substitutes?

A: Yes. ESR values vary among manufacturers: EKMM451VSN331MA40S specifies 1.005 Ohm @ 120 Hz, while other manufacturers provide different values (410 mOhm, 310 mOhm, 300 mOhm, 402 mOhm). Lower ESR generally indicates better high-frequency performance. All listed substitutes are electrically compatible; select based on your application's ripple current and frequency requirements.

Q: What is the lead spacing for all substitute parts?

A: All substitute parts listed maintain 0.394" (10.00 mm) lead spacing, identical to the EKMM451VSN331MA40S. This ensures direct PCB footprint compatibility without requiring layout modifications.

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