ESMM401VSN331MA30W Equivalent & Substitute Parts

Part Overview

The ESMM401VSN331MA30W is a 330 µF, 400 V aluminum electrolytic capacitor manufactured by Chemi-Con in the SMM series. This radial, can-style snap-in capacitor is designed for general-purpose applications requiring through-hole mounting with a 10.00 mm lead spacing and 35.00 mm diameter form factor. The component is rated for 3000 hours at 85°C with an equivalent series resistance of 1.005 Ohm at 120 Hz.

The part is currently active in production with 1141 pieces in stock. Substitute parts are necessary when the original manufacturer part becomes unavailable, when design requirements demand improved performance characteristics such as lower ESR or extended lifetime ratings, or when higher voltage ratings are required for system upgrades.

Key Parameters

Parameter	Value	Unit
Capacitance	330	µF
Tolerance	±20%	-
Voltage - Rated	400	V
ESR @ 120 Hz	1.005	Ohm
Lifetime @ 85°C	3000	Hrs
Operating Temperature Range	-25°C ~ 85°C	-
Lead Spacing	10.00	mm
Diameter	35.00	mm
Height - Seated (Max)	32.00	mm
Package / Case	Radial, Can - Snap-In	-
Mounting Type	Through Hole	-
Polarization	Polar	-

Substitute Part Grouping Explanation

Substitution eligibility for the ESMM401VSN331MA30W is determined by strict adherence to the following critical parameters:

Mandatory Matching Parameters:

Capacitance: 330 µF (exact match required)
Tolerance: ±20% (exact match required)
Voltage Rating: 400 V minimum (equal or higher voltage acceptable)
Package / Case: Radial, Can - Snap-In (exact match required)
Lead Spacing: 10.00 mm (exact match required)
Diameter: 35.00 mm (exact match required)
Height - Seated (Max): 32.00 mm (exact match required)
Mounting Type: Through Hole (exact match required)
Polarization: Polar (exact match required)

Performance Parameters (Flexible Within Limits):

ESR: Lower values are acceptable; higher values require engineering evaluation
Lifetime @ Temperature: Equal or extended ratings are acceptable
Operating Temperature Range: Must accommodate the application's thermal requirements
Ripple Current Ratings: Must meet or exceed application demands

All substitute parts listed maintain identical mechanical dimensions and electrical specifications within the allowed parameter ranges. Substitutes are grouped by voltage rating and performance characteristics.

Parameter Comparison

Parameter	ESMM401VSN331MA30W (Chemi-Con)	381LR331M400A022 (CDE)	B43501C9337M000 (EPCOS)	B43254C9337M000 (EPCOS)	B43634C5337M000 (EPCOS)	LQSW6331MELC30 (Nichicon)
Capacitance	330 µF	330 µF	330 µF	330 µF	330 µF	330 µF
Tolerance	±20%	±20%	±20%	±20%	±20%	±20%
Voltage - Rated	400 V	400 V	400 V	400 V	450 V	420 V
ESR @ Rated Frequency	1.005 Ohm @ 120 Hz	402 mOhm @ 120 Hz	200 mOhm @ 100 Hz	Not Specified	340 mOhm @ 100 Hz	Not Specified
Lifetime @ Temperature	3000 Hrs @ 85°C	3000 Hrs @ 105°C	10000 Hrs @ 85°C	3000 Hrs @ 105°C	8000 Hrs @ 85°C	3000 Hrs @ 105°C
Operating Temperature Range	-25°C ~ 85°C	-25°C ~ 105°C	-40°C ~ 85°C	-25°C ~ 105°C	-25°C ~ 85°C	-25°C ~ 105°C
Lead Spacing	10.00 mm	10.00 mm	10.00 mm	10.00 mm	10.00 mm	10.00 mm
Diameter	35.00 mm	35.00 mm	35.00 mm	35.00 mm	35.00 mm	35.00 mm
Height - Seated (Max)	32.00 mm	32.00 mm	32.00 mm	32.00 mm	32.00 mm	32.00 mm
Package / Case	Radial, Can - Snap-In	Radial, Can - Snap-In	Radial, Can - Snap-In	Radial, Can - Snap-In	Radial, Can - Snap-In	Radial, Can - Snap-In
Mounting Type	Through Hole	Through Hole	Through Hole	Through Hole	Through Hole	Through Hole
Polarization	Polar	Polar	Polar	Polar	Polar	Polar
RoHS Status	RoHS Compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant
Product Status	Active	Active	Not For New Designs	Not For New Designs	Active	Active

Engineering Selection Recommendations

Direct Equivalent (400 V Rating):

The 381LR331M400A022 from Cornell Dubilier Electronics is the primary direct equivalent. It maintains the 400 V voltage rating and 330 µF capacitance with identical mechanical dimensions. This part offers improved ESR performance (402 mOhm versus 1.005 Ohm) and extended temperature operation to 105°C. The part is active in production with substantial inventory availability (600,200 pieces).

The B43501C9337M000 from EPCOS provides superior ESR characteristics (200 mOhm) and extended lifetime (10000 hours at 85°C). However, this part carries a "Not For New Designs" status and should be used only for legacy system maintenance or replacement applications where the original specification is mandatory.

Upgraded Performance Options (Higher Voltage Ratings):

The B43634C5337M000 offers a 450 V rating with improved ESR (340 mOhm) and 8000-hour lifetime at 85°C. This upgrade is suitable for applications requiring enhanced voltage margin or improved thermal performance. The part is active in production.

The LQSW6331MELC30 from Nichicon provides a 420 V rating with extended temperature operation to 105°C and 3000-hour lifetime at that temperature. This part is active in production with the highest inventory availability (273,982 pieces) among all substitutes.

Compliance and Certification:

All substitute parts are RoHS3 compliant and REACH unaffected. The original ESMM401VSN331MA30W is RoHS compliant. All parts share identical ECCN (EAR99) and HTSUS (8532.22.0040) classifications.

Selection Criteria:

For direct replacement with improved performance: Select 381LR331M400A022
For legacy system maintenance: B43501C9337M000 remains available but is not recommended for new designs
For voltage margin enhancement: Select B43634C5337M000 (450 V)
For extended temperature operation and maximum availability: Select LQSW6331MELC30 (420 V)

Frequently Asked Questions (FAQ)

Q: Can I use a substitute part with a higher voltage rating than the original 400 V specification?

A: Yes. Parts rated at 420 V (LQSW6331MELC30) or 450 V (B43634C5337M000) are electrically compatible with 400 V applications. Higher voltage ratings provide additional safety margin and do not negatively affect circuit performance. The capacitance, tolerance, and mechanical dimensions remain identical.

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

A: ESR affects ripple current handling and heat generation. Lower ESR values (200 mOhm in B43501C9337M000 versus 1.005 Ohm in the original) result in reduced power dissipation and improved high-frequency performance. For general-purpose applications, both values are acceptable. Applications with high ripple current demands benefit from lower ESR substitutes.

Q: Are all substitute parts mechanically interchangeable?

A: Yes. All listed substitute parts maintain identical lead spacing (10.00 mm), diameter (35.00 mm), height (32.00 mm), and snap-in package configuration. Direct PCB mounting and connector compatibility are preserved without modification.

Q: What does "Not For New Designs" status mean for the B43501C9337M000 and B43254C9337M000?

A: This designation indicates that EPCOS has discontinued these parts for new product development. They remain available for existing system support and replacement applications. For new designs, select from active-status alternatives: 381LR331M400A022, B43634C5337M000, or LQSW6331MELC30.

Q: How do operating temperature ranges affect substitution?

A: The original part operates from -25°C to 85°C. Substitutes with extended ranges (-25°C to 105°C) are fully compatible and provide enhanced thermal margin. The lifetime rating at elevated temperature (105°C) indicates improved thermal stability. Selection depends on the application's actual operating environment.

Q: What inventory considerations should guide part selection?

A: The LQSW6331MELC30 offers the highest inventory availability (273,982 pieces), followed by 381LR331M400A022 (600,200 pieces). For applications requiring immediate procurement or high-volume orders, these parts provide supply security. The original ESMM401VSN331MA30W has 1141 pieces in stock.

Q: Are all substitute parts RoHS compliant?

A: Yes. All substitute parts are RoHS3 compliant. The original ESMM401VSN331MA30W is RoHS compliant. All parts meet REACH requirements and carry identical ECCN and HTSUS classifications for regulatory and customs purposes.

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