ESMH401VSN331MA30W Equivalent & Substitute Parts

Part Overview

The ESMH401VSN331MA30W is a 330 µF, 400 V aluminum electrolytic capacitor manufactured by Chemi-Con in the SMH series. This radial, can-style snap-in capacitor is designed for general-purpose applications requiring stable capacitance and reliable performance across industrial temperature ranges. The part is currently active in production with 981 units in stock.

Equivalent and substitute parts are necessary when the original part becomes unavailable, when design requirements demand enhanced performance characteristics such as higher voltage ratings or extended operational lifetimes, or when alternative manufacturers' components offer superior electrical properties for the same footprint and mounting configuration.

Key Parameters

Parameter	Value
Capacitance	330 µF
Voltage Rating	400 V
Tolerance	±20%
ESR @ 120 Hz	753 mOhm
Lifetime @ Temperature	2000 Hrs @ 85°C
Operating Temperature Range	-25°C ~ 85°C
Lead Spacing	0.394" (10.00 mm)
Case Diameter	1.378" (35.00 mm)
Height (Seated Max)	1.260" (32.00 mm)
Package Type	Radial, Can - Snap-In
Mounting Type	Through Hole
RoHS Status	ROHS3 Compliant

Substitute Part Grouping Explanation

Substitution eligibility is determined by the following criteria:

Primary Compatibility Requirements:

Capacitance value: 330 µF (exact match required)
Tolerance: ±20% (exact match required)
Package type: Radial, Can - Snap-In (exact match required)
Lead spacing: 0.394" (10.00 mm) (exact match required)
Case diameter: 1.378" (35.00 mm) (exact match required)
Mounting type: Through Hole (exact match required)

Secondary Performance Parameters (Allow Substitution):

Voltage rating: 400 V or higher (upgrades permitted)
Operating temperature range: -25°C minimum, 85°C or higher maximum (upgrades permitted)
Lifetime @ temperature: 2000 Hrs or longer (upgrades permitted)
ESR: Lower values preferred but not mandatory for compatibility

All substitute parts listed maintain identical mechanical dimensions and electrical capacitance specifications. Voltage rating upgrades provide enhanced safety margins in applications subject to transient overvoltages. Extended temperature operating ranges and longer lifetimes improve reliability in demanding thermal environments.

Parameter Comparison

Manufacturer Part Number	Manufacturer	Series	Capacitance	Voltage	Tolerance	ESR @ Frequency	Lifetime @ Temp	Operating Temp Range	Lead Spacing	Case Diameter	Height (Max)	Product Status
ESMH401VSN331MA30W	Chemi-Con	SMH	330 µF	400 V	±20%	753 mOhm @ 120 Hz	2000 Hrs @ 85°C	-25°C ~ 85°C	0.394" (10.00 mm)	1.378" (35.00 mm)	1.260" (32.00 mm)	Active
EKMQ421VSN331MA30S	Chemi-Con	KMQ	330 µF	420 V	±20%	Not specified	2000 Hrs @ 105°C	-25°C ~ 105°C	0.394" (10.00 mm)	1.378" (35.00 mm)	1.260" (32.00 mm)	Active
ESMQ451VSN331MA30S	Chemi-Con	SMQ	330 µF	450 V	±20%	Not specified	2000 Hrs @ 85°C	-25°C ~ 85°C	0.394" (10.00 mm)	1.378" (35.00 mm)	1.260" (32.00 mm)	Active
381LQ331M400A022	Cornell Dubilier Electronics (CDE)	381LQ	330 µF	400 V	±20%	553 mOhm @ 120 Hz	2000 Hrs @ 105°C	-25°C ~ 105°C	0.394" (10.00 mm)	1.378" (35.00 mm)	1.260" (32.00 mm)	Active
381LR331M400A022	Cornell Dubilier Electronics (CDE)	381LR	330 µF	400 V	±20%	402 mOhm @ 120 Hz	3000 Hrs @ 105°C	-25°C ~ 105°C	0.394" (10.00 mm)	1.378" (35.00 mm)	1.260" (32.00 mm)	Active
B43501C9337M000	EPCOS - TDK Electronics	B43501	330 µF	400 V	±20%	200 mOhm @ 100 Hz	10000 Hrs @ 85°C	-40°C ~ 85°C	0.394" (10.00 mm)	1.378" (35.00 mm)	1.260" (32.00 mm)	Not For New Designs
LLS2G331MELC	Nichicon	LLS	330 µF	400 V	±20%	Not specified	3000 Hrs @ 85°C	-25°C ~ 85°C	0.394" (10.00 mm)	1.378" (35.00 mm)	1.181" (30.00 mm)	Active
380LQ331M450A022	Cornell Dubilier Electronics (CDE)	380LQ	330 µF	450 V	±20%	600 mOhm @ 120 Hz	2000 Hrs @ 85°C	-25°C ~ 85°C	0.394" (10.00 mm)	1.378" (35.00 mm)	1.260" (32.00 mm)	Active
450MXH330MEFCSN35X30	Rubycon	MXH	330 µF	450 V	±20%	Not specified	2000 Hrs @ 105°C	-25°C ~ 105°C	0.394" (10.00 mm)	1.378" (35.00 mm)	1.260" (32.00 mm)	Active
B43254C9337M000	EPCOS - TDK Electronics	B43254	330 µF	400 V	±20%	Not specified	3000 Hrs @ 105°C	-25°C ~ 105°C	0.394" (10.00 mm)	1.378" (35.00 mm)	1.260" (32.00 mm)	Not For New Designs
B43634C5337M000	EPCOS - TDK Electronics	B43634	330 µF	450 V	±20%	340 mOhm @ 100 Hz	8000 Hrs @ 85°C	-25°C ~ 85°C	0.394" (10.00 mm)	1.378" (35.00 mm)	1.260" (32.00 mm)	Active

Engineering Selection Recommendations

Direct Equivalents (400 V Rating, Same Voltage Class):

381LQ331M400A022 and 381LR331M400A022 from Cornell Dubilier Electronics are direct voltage-class equivalents. The 381LR331M400A022 offers superior performance with lower ESR (402 mOhm vs. 753 mOhm), extended lifetime (3000 Hrs @ 105°C vs. 2000 Hrs @ 85°C), and wider operating temperature range (-25°C ~ 105°C). Both parts maintain ROHS3 compliance and are actively produced.

LLS2G331MELC from Nichicon is a direct 400 V equivalent with extended lifetime (3000 Hrs @ 85°C). Note that this part has a reduced seated height of 1.181" (30.00 mm) compared to the original 1.260" (32.00 mm), which may affect board layout compatibility in space-constrained applications.

B43501C9337M000 from EPCOS - TDK Electronics is a 400 V equivalent with superior ESR performance (200 mOhm @ 100 Hz) and extended lifetime (10000 Hrs @ 85°C). However, this part is marked "Not For New Designs" and should be used only for legacy system maintenance or repair applications.

Voltage-Upgraded Substitutes (420 V and 450 V Ratings):

EKMQ421VSN331MA30S from Chemi-Con provides a 420 V upgrade with extended operating temperature range (-25°C ~ 105°C) and identical mechanical dimensions. This part is suitable for applications requiring enhanced voltage margin.

ESMQ451VSN331MA30S, 380LQ331M450A022, 450MXH330MEFCSN35X30, and B43634C5337M000 all provide 450 V voltage upgrades. The 450MXH330MEFCSN35X30 from Rubycon offers the highest inventory availability (25,870 units) and extended temperature operation (-25°C ~ 105°C). The B43634C5337M000 from EPCOS - TDK Electronics provides extended lifetime (8000 Hrs @ 85°C) with lower ESR (340 mOhm @ 100 Hz).

Obsolescence Considerations:

B43254C9337M000 from EPCOS - TDK Electronics is marked "Not For New Designs" and should be avoided for new product development. This part is suitable only for field replacement in existing systems.

All recommended active-status parts maintain ROHS3 compliance and REACH unaffected status, ensuring regulatory compliance for industrial and commercial applications.

Frequently Asked Questions (FAQ)

Q: Can I use a 450 V rated capacitor in place of the original 400 V part?

A: Yes. A higher voltage rating provides additional safety margin against transient overvoltages and is electrically compatible. The 450 V parts listed maintain identical capacitance (330 µF), tolerance (±20%), mechanical dimensions, and lead spacing. Voltage upgrades do not degrade circuit performance.

Q: What is the significance of ESR (Equivalent Series Resistance)?

A: ESR determines the capacitor's ability to handle ripple current and affects heat generation. Lower ESR values indicate better high-frequency performance and reduced thermal stress. The original part specifies 753 mOhm @ 120 Hz. Substitute parts with lower ESR values (such as 381LR331M400A022 at 402 mOhm or B43501C9337M000 at 200 mOhm) provide improved performance in ripple-current-intensive applications.

Q: Does the LLS2G331MELC from Nichicon fit in the same PCB footprint?

A: The LLS2G331MELC maintains identical lead spacing (0.394" / 10.00 mm) and case diameter (1.378" / 35.00 mm), ensuring PCB mounting compatibility. However, its seated height is 1.181" (30.00 mm) versus the original 1.260" (32.00 mm). This 0.079" (2.00 mm) height reduction may affect clearance in applications with tight vertical space constraints. Verify clearance before substitution.

Q: Why are some parts marked "Not For New Designs"?

A: Parts marked "Not For New Designs" are in mature or declining production phases. While electrically and mechanically compatible, they may face future availability constraints. For new product development, select from active-status parts such as 381LR331M400A022, 450MXH330MEFCSN35X30, or EKMQ421VSN331MA30S.

Q: What is the difference between 2000 Hrs @ 85°C and 3000 Hrs @ 105°C lifetime ratings?

A: Both specifications describe capacitor lifespan under specific thermal conditions. The original part is rated for 2000 hours at 85°C. Substitute parts with extended lifetimes (such as 3000 Hrs @ 105°C or 10000 Hrs @ 85°C) indicate longer operational durability. Extended lifetime ratings are beneficial in applications subject to sustained elevated temperatures or requiring long service intervals.

Q: Are all substitute parts RoHS3 compliant?

A: Yes. All substitute parts listed are ROHS3 compliant and REACH unaffected, meeting current environmental and regulatory requirements for industrial and commercial electronics manufacturing.

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