ESMH401VSN331MA Equivalent & Substitute Parts Reference

Part Overview

The ESMH401VSN331MA 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 extended operational life. The part is currently active in production and ROHS3 compliant.

Equivalent and substitute parts are necessary when the original manufacturer part becomes unavailable, when design requirements demand enhanced performance characteristics such as higher voltage ratings or extended lifetime specifications, or when alternative manufacturers offer superior electrical properties within the same mechanical envelope and electrical parameters.

Key Parameters

Parameter	Value	Unit	Substitution Relevance
Capacitance	330	µF	Must match exactly
Voltage - Rated	400	V	Can be equal or higher
Tolerance	±20%	%	Must match or be tighter
Lead Spacing	10.00	mm	Must match for PCB compatibility
Size / Dimension	35.00 Dia	mm	Must match for mechanical fit
Height - Seated (Max)	32.00	mm	Must match or be lower
Mounting Type	Through Hole	-	Must match
Package / Case	Radial, Can - Snap-In	-	Must match
Operating Temperature	-25°C ~ 85°C	°C	Can be equal or wider range
Polarization	Polar	-	Must match
RoHS Status	ROHS3 Compliant	-	Must maintain compliance

Substitute Part Grouping Explanation

Substitution logic for the ESMH401VSN331MA is based on strict electrical and mechanical compatibility criteria. All substitute parts must maintain the following core parameters:

Mandatory Match Parameters:

Capacitance: 330 µF (exact)
Lead Spacing: 10.00 mm (exact)
Size / Dimension: 35.00 mm diameter (exact)
Mounting Type: Through Hole (exact)
Package / Case: Radial, Can - Snap-In (exact)
Polarization: Polar (exact)
Tolerance: ±20% or tighter

Allowable Variation Parameters:

Voltage - Rated: 400 V or higher (higher voltage provides design margin)
Height - Seated: 32.00 mm maximum (lower heights acceptable)
Operating Temperature: -25°C ~ 85°C or wider range (extended range acceptable)
ESR: Lower values indicate improved performance
Lifetime @ Temperature: Higher values indicate extended reliability

Substitute parts are categorized as:

Direct Substitutes: Identical voltage rating (400 V) with equivalent or superior electrical characteristics
Upgrade Substitutes: Higher voltage ratings (420 V, 450 V) providing increased design margin while maintaining mechanical compatibility

Parameter Comparison

Manufacturer Part Number	Manufacturer	Series	Capacitance (µF)	Voltage (V)	Tolerance	ESR @ Frequency	Lifetime @ Temp	Operating Temp (°C)	Height (mm)	Product Status
ESMH401VSN331MA30M	Chemi-Con	SMH	330	400	±20%	753 mOhm @ 120 Hz	2000 Hrs @ 85°C	-25 ~ 85	32.00	Active
EKMQ421VSN331MA30S	Chemi-Con	KMQ	330	420	±20%	Not specified	2000 Hrs @ 105°C	-25 ~ 105	32.00	Active
ESMQ451VSN331MA30S	Chemi-Con	SMQ	330	450	±20%	Not specified	2000 Hrs @ 85°C	-25 ~ 85	32.00	Active
381LQ331M400A022	Cornell Dubilier Electronics (CDE)	381LQ	330	400	±20%	553 mOhm @ 120 Hz	2000 Hrs @ 105°C	-25 ~ 105	32.00	Active
381LR331M400A022	Cornell Dubilier Electronics (CDE)	381LR	330	400	±20%	402 mOhm @ 120 Hz	3000 Hrs @ 105°C	-25 ~ 105	32.00	Active
B43501C9337M000	EPCOS - TDK Electronics	B43501	330	400	±20%	200 mOhm @ 100 Hz	10000 Hrs @ 85°C	-40 ~ 85	32.00	Not For New Designs
LLS2G331MELC	Nichicon	LLS	330	400	±20%	Not specified	3000 Hrs @ 85°C	-25 ~ 85	30.00	Active
380LQ331M450A022	Cornell Dubilier Electronics (CDE)	380LQ	330	450	±20%	600 mOhm @ 120 Hz	2000 Hrs @ 85°C	-25 ~ 85	32.00	Active
450MXH330MEFCSN35X30	Rubycon	MXH	330	450	±20%	Not specified	2000 Hrs @ 105°C	-25 ~ 105	32.00	Active
B43254C9337M000	EPCOS - TDK Electronics	B43254	330	400	±20%	Not specified	3000 Hrs @ 105°C	-25 ~ 105	32.00	Not For New Designs
B43634C5337M000	EPCOS - TDK Electronics	B43634	330	450	±20%	340 mOhm @ 100 Hz	8000 Hrs @ 85°C	-25 ~ 85	32.00	Active

Engineering Selection Recommendations

Direct Substitutes (400 V Rating):

The following parts are direct substitutes for the ESMH401VSN331MA30M at the same 400 V voltage rating:

381LR331M400A022 (Cornell Dubilier Electronics): Recommended for applications requiring extended operational life. This part offers 3000 hours at 105°C compared to the original 2000 hours at 85°C, with superior ESR performance (402 mOhm vs. 753 mOhm). Operating temperature range extends to 105°C. Product status is Active.
381LQ331M400A022 (Cornell Dubilier Electronics): Suitable for general-purpose replacement. Provides 2000 hours at 105°C with improved ESR (553 mOhm). Extended operating temperature to 105°C. Product status is Active.
LLS2G331MELC (Nichicon): Direct electrical equivalent with 3000 hours at 85°C lifetime. Height is 30.00 mm (lower than original 32.00 mm maximum), which is mechanically acceptable. Product status is Active.
B43501C9337M000 (EPCOS - TDK Electronics): Offers superior ESR performance (200 mOhm @ 100 Hz) and extended lifetime (10000 hours at 85°C). Extended operating temperature range (-40°C to 85°C). Product status is Not For New Designs; use only for legacy system maintenance.
B43254C9337M000 (EPCOS - TDK Electronics): Provides 3000 hours at 105°C with extended operating temperature range. Product status is Not For New Designs; use only for legacy system maintenance.

Upgrade Substitutes (Higher Voltage Ratings):

The following parts provide higher voltage ratings, offering increased design margin:

EKMQ421VSN331MA30S (Chemi-Con): 420 V rating with extended operating temperature to 105°C and 2000 hours lifetime at 105°C. Same manufacturer as original part. Product status is Active.
ESMQ451VSN331MA30S (Chemi-Con): 450 V rating. Same manufacturer as original part. Product status is Active.
380LQ331M450A022 (Cornell Dubilier Electronics): 450 V rating with 2000 hours at 85°C. Product status is Active.
450MXH330MEFCSN35X30 (Rubycon): 450 V rating with 2000 hours at 105°C and extended operating temperature range. Highest inventory availability (25,870 pcs). Product status is Active.
B43634C5337M000 (EPCOS - TDK Electronics): 450 V rating with 8000 hours at 85°C and superior ESR (340 mOhm @ 100 Hz). Product status is Active.

Selection Criteria:

For direct replacement in existing designs: Select 400 V rated parts with Active product status (381LR331M400A022, 381LQ331M400A022, LLS2G331MELC).
For new designs requiring enhanced reliability: Select parts with extended lifetime specifications and Active product status (381LR331M400A022, 450MXH330MEFCSN35X30, B43634C5337M000).
For legacy system maintenance: Parts marked "Not For New Designs" are acceptable only for repair and replacement of existing equipment.
All recommended substitutes maintain ROHS3 compliance and REACH unaffected status.

Frequently Asked Questions (FAQ)

Q: Can I use a 420 V or 450 V rated capacitor in place of the original 400 V part?

A: Yes. Higher voltage-rated capacitors are electrically compatible substitutes. A 420 V or 450 V capacitor will function correctly in a circuit designed for 400 V operation, as the higher voltage rating provides additional design margin and does not affect circuit performance. All mechanical parameters (lead spacing, size, height, mounting type) must remain identical.

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

A: ESR affects ripple current handling capability and heat generation. Lower ESR values indicate better performance under high-frequency ripple current conditions. The original ESMH401VSN331MA30M has 753 mOhm ESR @ 120 Hz. Substitute parts with lower ESR values (such as B43501C9337M000 at 200 mOhm) provide superior performance in applications with significant AC ripple current.

Q: Why do some substitute parts have different height specifications?

A: The LLS2G331MELC has a maximum seated height of 30.00 mm compared to the original 32.00 mm. This lower height is mechanically acceptable and will fit in any PCB layout designed for the original part. Conversely, a taller substitute would not be acceptable.

Q: What does "Not For New Designs" product status mean?

A: Parts marked "Not For New Designs" (such as B43501C9337M000 and B43254C9337M000) are obsolete or end-of-life components. These parts are acceptable only for repair and replacement of existing equipment already using these components. New circuit designs should use parts with Active product status.

Q: Are all substitute parts ROHS3 compliant?

A: Yes. All substitute parts listed in this reference maintain ROHS3 compliance and REACH unaffected status, matching the environmental compliance of the original ESMH401VSN331MA30M.

Q: What is the difference between Chemi-Con SMH and KMQ series capacitors?

A: Both are Chemi-Con aluminum electrolytic capacitors with identical mechanical dimensions and lead spacing. The KMQ series (EKMQ421VSN331MA30S) offers extended operating temperature range (-25°C to 105°C) and higher voltage rating (420 V) compared to the SMH series original part.

Q: Can I substitute a capacitor with a different tolerance rating?

A: Substitute parts must have tolerance equal to or tighter than ±20%. All listed substitutes maintain ±20% tolerance, ensuring circuit performance consistency.

Q: What inventory considerations should I evaluate?

A: Inventory availability varies significantly among substitutes. The 450MXH330MEFCSN35X30 (Rubycon) has the highest availability at 25,870 pieces. The 381LR331M400A022 (Cornell Dubilier) has 600,200 pieces available. Consider long-term supply chain stability when selecting substitutes for production applications.

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