ESMH451VSN331MR50S Equivalent & Substitute Parts Reference

Part Overview

The ESMH451VSN331MR50S is a 330 µF, 450 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 high voltage energy storage and filtering. The component features a rated lifetime of 2000 hours at 85°C with an equivalent series resistance (ESR) of 753 mOhm at 120 Hz.

Substitute parts are necessary when the original component becomes unavailable, when design requirements demand extended operational lifetime, improved thermal performance, or when alternative manufacturers' components offer equivalent electrical and mechanical compatibility within the same package envelope and electrical specifications.

Key Parameters

Parameter	Value	Unit	Substitution Relevance
Capacitance	330	µF	Critical - must match exactly
Voltage Rating	450	V	Critical - minimum requirement
Tolerance	±20%	%	Critical - must match or be tighter
Package Type	Radial, Can - Snap-In	-	Critical - mechanical compatibility
Lead Spacing	10.00	mm	Critical - PCB footprint compatibility
Diameter	30.00	mm	Critical - physical envelope
Height (Max)	52.00	mm	Important - clearance constraints
Operating Temperature Range	-25 to 85	°C	Important - thermal environment
Mounting Type	Through Hole	-	Critical - assembly compatibility
RoHS Status	ROHS3 Compliant	-	Important - regulatory requirement

Substitute Part Grouping Explanation

Substitution logic for the ESMH451VSN331MR50S is based on the following mandatory electrical and mechanical parameters:

Critical Matching Parameters:

Capacitance: 330 µF (exact match required)
Voltage Rating: 450 V minimum (higher voltage ratings are acceptable)
Tolerance: ±20% (tighter tolerances are acceptable)
Package Type: Radial, Can - Snap-In (exact match required)
Lead Spacing: 10.00 mm (exact match required)
Diameter: 30.00 mm (exact match required)
Mounting Type: Through Hole (exact match required)

Secondary Compatibility Parameters:

Height: Substitutes with heights up to 52.50 mm are acceptable within typical PCB clearance margins
Operating Temperature: Substitutes rated to 85°C or higher are acceptable
ESR: Lower ESR values indicate improved performance but are not mandatory for substitution
Lifetime: Extended lifetime ratings indicate improved reliability but do not prevent substitution

Substitute parts are grouped into three categories:

Direct Substitutes (Same Voltage, Same Series): Parts maintaining 450 V rating with identical or improved electrical characteristics
Upgraded Substitutes (Higher Voltage or Extended Lifetime): Parts with 500 V rating or extended thermal lifetime at higher temperatures
Cross-Manufacturer Substitutes: Equivalent parts from alternative manufacturers meeting all critical parameters

Parameter Comparison

Part Number	Manufacturer	Series	Capacitance (µF)	Voltage (V)	Tolerance	ESR @ 120Hz (mOhm)	Lifetime @ Temp	Height (mm)	Status
ESMH451VSN331MR50S	Chemi-Con	SMH	330	450	±20%	753	2000 Hrs @ 85°C	52.00	Active
ESMR451VSN331MR30S	Chemi-Con	SMR	330	450	±20%	-	2000 Hrs @ 85°C	32.50	Active
ELHS501VSN331MR50S	Chemi-Con	LHS	330	500	±20%	-	5000 Hrs @ 105°C	52.50	Active
ETXH451VSN331MR50S	Chemi-Con	TXH	330	450	±20%	-	10000 Hrs @ 105°C	52.00	Active
380LX331M450K052	Cornell Dubilier	380LX	330	450	±20%	550	3000 Hrs @ 85°C	52.00	Active
381LR331M450K052	Cornell Dubilier	381LR	330	450	±20%	402	3000 Hrs @ 105°C	52.00	Active
450USG330MEFCSN30X35	Rubycon	USG	330	450	±20%	-	3000 Hrs @ 85°C	37.00	Active
B43504A5337M000	EPCOS - TDK	B43504	330	450	±20%	410	3000 Hrs @ 105°C	52.00	Not For New Designs
B43509A5337M000	EPCOS - TDK	B43509	330	450	±20%	300	3000 Hrs @ 105°C	52.00	Active
B43624A5337M000	EPCOS - TDK	B43624	330	450	±20%	330	8000 Hrs @ 85°C	52.00	Active
LLS2W331MELB	Nichicon	LLS	330	450	±20%	-	3000 Hrs @ 85°C	40.00	Active

Engineering Selection Recommendations

For Direct Replacement (Same Performance Profile):

ESMR451VSN331MR30S (Chemi-Con SMR series) provides direct electrical equivalence with identical 450 V rating and 2000-hour lifetime at 85°C. This part is preferred when space constraints permit the reduced height of 32.50 mm. Both parts maintain ROHS3 compliance and identical operating temperature range.

For Extended Thermal Lifetime:

ETXH451VSN331MR50S (Chemi-Con TXH series) extends operational lifetime to 10,000 hours at 105°C while maintaining the 450 V rating and original height envelope. This part is suitable for applications requiring enhanced reliability over extended service periods. Operating temperature range extends to 105°C.

ELHS501VSN331MR50S (Chemi-Con LHS series) provides upgraded 500 V rating with 5000-hour lifetime at 105°C. This part is suitable when higher voltage margin is required or when thermal environment reaches 105°C.

For Cross-Manufacturer Equivalence:

B43624A5337M000 (EPCOS - TDK B43624 series) offers extended 8000-hour lifetime at 85°C with lower ESR of 330 mOhm at 100 Hz. This part maintains identical physical envelope and electrical specifications. Product status is Active.

B43509A5337M000 (EPCOS - TDK B43509 series) provides superior ESR performance at 300 mOhm with 3000-hour lifetime at 105°C. This part is suitable for applications sensitive to impedance characteristics.

381LR331M450K052 (Cornell Dubilier 381LR series) offers low ESR of 402 mOhm at 120 Hz with 3000-hour lifetime at 105°C. This part is suitable for high-ripple-current applications.

380LX331M450K052 (Cornell Dubilier 380LX series) provides 550 mOhm ESR with 3000-hour lifetime at 85°C. This part maintains identical height and voltage specifications.

For Space-Constrained Applications:

450USG330MEFCSN30X35 (Rubycon USG series) reduces height to 37.00 mm while maintaining all electrical specifications. This part is suitable when PCB clearance is limited.

LLS2W331MELB (Nichicon LLS series) reduces height to 40.00 mm with 3000-hour lifetime at 85°C. This part is suitable for moderate space constraints.

Parts Not Recommended for New Designs:

B43504A5337M000 (EPCOS - TDK B43504 series) carries "Not For New Designs" status. This part should be used only for legacy system maintenance or repair applications where original component sourcing is required.

Frequently Asked Questions (FAQ)

Q: Can I substitute ESMH451VSN331MR50S with a 500 V rated capacitor?

A: Yes. ELHS501VSN331MR50S (500 V rating) is a valid substitute. Higher voltage ratings provide additional safety margin and do not affect circuit operation when the original 450 V specification is met. The 500 V part maintains identical capacitance, tolerance, and package dimensions.

Q: What is the difference between the SMH and SMR series from Chemi-Con?

A: Both series maintain identical electrical specifications (330 µF, 450 V, ±20% tolerance, 2000 Hrs @ 85°C). The primary difference is physical height: SMH is 52.00 mm while SMR is 32.50 mm. Selection depends on available PCB clearance.

Q: Can I use a substitute with lower ESR?

A: Yes. Lower ESR values indicate improved performance characteristics. B43509A5337M000 (300 mOhm ESR) and B43624A5337M000 (330 mOhm ESR) both provide superior impedance performance compared to the original 753 mOhm ESR specification. These parts are suitable for applications where ripple current handling or thermal performance is critical.

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

A: B43504A5337M000 carries this status, indicating the manufacturer no longer recommends this part for new product development. This part should be reserved for maintenance of existing systems or legacy equipment repair. For new designs, select from parts with "Active" status.

Q: Are all substitute parts RoHS compliant?

A: All listed substitute parts maintain ROHS3 compliance or equivalent regulatory status. Compliance certifications are provided in the detailed specifications for each part.

Q: Can I substitute based on height alone?

A: No. Height is a secondary parameter. All substitutes must first match the critical parameters: 330 µF capacitance, 450 V minimum voltage rating, ±20% tolerance, 10.00 mm lead spacing, 30.00 mm diameter, radial snap-in package, and through-hole mounting. Height variation is acceptable only after these critical parameters are confirmed.

Q: What is the difference between lifetime ratings at 85°C versus 105°C?

A: Lifetime ratings specify operational duration at stated temperature. A part rated 3000 Hrs @ 105°C will experience accelerated aging at higher temperatures compared to a part rated 2000 Hrs @ 85°C. Selection depends on the actual operating temperature of the application. If the circuit operates at 85°C, both ratings are valid; if operation reaches 105°C, select parts rated for that temperature.

Q: Can I use ESMR451VSN331MR30S in place of ESMH451VSN331MR50S?

A: Yes, provided PCB layout permits the reduced height of 32.50 mm. All electrical specifications are identical. Verify that the lower profile does not create clearance conflicts with adjacent components or enclosure constraints.

Q: Which substitute offers the best overall performance?

A: Selection depends on application requirements. ETXH451VSN331MR50S offers the longest lifetime (10,000 Hrs @ 105°C) for demanding applications. B43509A5337M000 offers the lowest ESR (300 mOhm) for high-ripple-current applications. B43624A5337M000 offers extended 8000-hour lifetime at 85°C with good ESR performance. Evaluate based on specific thermal and electrical requirements.

Q: Are cross-manufacturer parts (Cornell Dubilier, EPCOS, Rubycon, Nichicon) fully compatible?

A: Yes. All listed cross-manufacturer parts meet the critical electrical and mechanical parameters: 330 µF, 450 V, ±20% tolerance, 10.00 mm lead spacing, 30.00 mm diameter, radial snap-in package, and through-hole mounting. Physical envelope compatibility is confirmed. Electrical performance characteristics vary by series; select based on ESR, lifetime, and thermal requirements specific to your application.

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