ESMM451VSN271MR35S Equivalent & Substitute Parts

Part Overview

The ESMM451VSN271MR35S is a 270 µF, 450 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 high voltage energy storage and filtering. The component features a rated lifetime of 3000 hours at 85°C and operates across a temperature range of -25°C to 85°C. As an active product with RoHS compliance, equivalent and substitute parts are available from alternative manufacturers to support procurement flexibility, inventory management, and supply chain continuity.

Key Parameters

Parameter	Value
Capacitance	270 µF
Voltage Rating	450 V
Tolerance	±20%
Package Type	Radial, Can - Snap-In
Lead Spacing	0.394" (10.00 mm)
Diameter	1.181" (30.00 mm)
Height (Max)	1.457" (37.00 mm)
Mounting Type	Through Hole
Polarization	Polar
Operating Temperature Range	-25°C to 85°C
Lifetime Rating	3000 Hrs @ 85°C

Substitute Part Grouping Explanation

Substitution eligibility for the ESMM451VSN271MR35S is determined by strict adherence to the following core parameters:

Critical Matching Parameters:

Capacitance: 270 µF (exact match required)
Voltage Rating: 450 V (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)
Physical Dimensions: 1.181" Dia × 1.457" Height Max (exact match required)
Mounting Type: Through Hole (exact match required)
Polarization: Polar (exact match required)

All substitute parts listed meet these critical parameters. Variations in ESR, ripple current ratings, lifetime specifications, and operating temperature ranges do not disqualify substitution, as these represent performance enhancements or different application suitability rather than incompatibility. All substitute parts are active products with current manufacturing status and appropriate compliance certifications.

Parameter Comparison

Parameter	ESMM451VSN271MR35S (Chemi-Con)	B43644B5277M000 (EPCOS - TDK)	LLS2W271MELB (Nichicon)	450VXG270MEFCSN30X35 (Rubycon)
Capacitance	270 µF	270 µF	270 µF	270 µF
Voltage Rating	450 V	450 V	450 V	450 V
Tolerance	±20%	±20%	±20%	±20%
Lead Spacing	0.394" (10.00 mm)	0.394" (10.00 mm)	0.394" (10.00 mm)	0.394" (10.00 mm)
Diameter	1.181" (30.00 mm)	1.181" (30.00 mm)	1.181" (30.00 mm)	1.181" (30.00 mm)
Height (Max)	1.457" (37.00 mm)	1.457" (37.00 mm)	1.378" (35.00 mm)	1.457" (37.00 mm)
Mounting Type	Through Hole	Through Hole	Through Hole	Through Hole
Package Type	Radial, Can - Snap-In	Radial, Can - Snap-In	Radial, Can - Snap-In	Radial, Can - Snap-In
Polarization	Polar	Polar	Polar	Polar
Operating Temperature	-25°C ~ 85°C	-40°C ~ 105°C	-25°C ~ 85°C	-25°C ~ 105°C
Lifetime @ Temp.	3000 Hrs @ 85°C	5000 Hrs @ 105°C	3000 Hrs @ 85°C	5000 Hrs @ 105°C
ESR @ Specified Frequency	1.228 Ohm @ 120 Hz	370 mOhm @ 100 Hz	Not Specified	Not Specified
Ripple Current @ 120 Hz	1.89 A @ 120 Hz	1.36 A @ 100 Hz	1.89 A @ 120 Hz	1.51 A @ 120 Hz
RoHS Status	RoHS Compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant
Product Status	Active	Active	Active	Active

Engineering Selection Recommendations

All four parts listed are active products with current manufacturing status and appropriate environmental compliance certifications. Selection among these substitutes should be based on application-specific requirements and availability:

ESMM451VSN271MR35S (Chemi-Con SMM Series): Original specification. Baseline performance with 3000-hour lifetime at 85°C and 1.228 Ohm ESR at 120 Hz. Suitable for standard general-purpose applications within the specified temperature range.

B43644B5277M000 (EPCOS - TDK B43644 Series): Extended operating temperature range (-40°C to 105°C) and enhanced lifetime rating (5000 hours at 105°C). Lower ESR of 370 mOhm at 100 Hz provides improved performance in high-frequency ripple current applications. ROHS3 compliant. Suitable for applications requiring extended temperature operation or enhanced thermal performance.

LLS2W271MELB (Nichicon LLS Series): Matches original operating temperature range (-25°C to 85°C) and lifetime specification (3000 hours at 85°C). Identical ripple current rating at 120 Hz (1.89 A). Slightly reduced height (1.378" vs. 1.457") provides marginal space savings. ROHS3 compliant. Direct functional equivalent with minor dimensional advantage.

450VXG270MEFCSN30X35 (Rubycon VXG Series): Extended operating temperature range (-25°C to 105°C) and enhanced lifetime rating (5000 hours at 105°C). Represents an upgrade option for applications requiring improved thermal stability and extended service life. ROHS3 compliant. Suitable for demanding applications with elevated ambient temperatures or extended operational requirements.

All parts are through-hole mounted with identical lead spacing and snap-in package configuration, ensuring direct mechanical and electrical compatibility within PCB designs.

Frequently Asked Questions (FAQ)

Q: Can the LLS2W271MELB be used as a direct replacement for the ESMM451VSN271MR35S?

A: Yes. The LLS2W271MELB meets all critical substitution parameters: 270 µF capacitance, 450 V voltage rating, ±20% tolerance, identical lead spacing (10.00 mm), identical diameter (30.00 mm), radial snap-in package, and through-hole mounting. The height difference (1.378" vs. 1.457") is within acceptable mechanical tolerance for most PCB layouts. Both parts share identical operating temperature range and lifetime specifications.

Q: What is the advantage of the B43644B5277M000 over the original ESMM451VSN271MR35S?

A: The B43644B5277M000 offers an extended operating temperature range (-40°C to 105°C versus -25°C to 85°C) and enhanced lifetime rating (5000 hours at 105°C versus 3000 hours at 85°C). The ESR is significantly lower at 370 mOhm, which reduces heat generation in ripple current applications. These characteristics make it suitable for applications with higher ambient temperatures or extended service life requirements.

Q: Are all substitute parts RoHS compliant?

A: Yes. The original ESMM451VSN271MR35S is RoHS Compliant. All three substitute parts (B43644B5277M000, LLS2W271MELB, and 450VXG270MEFCSN30X35) are ROHS3 Compliant, meeting current environmental regulations.

Q: Does the height difference of the LLS2W271MELB affect PCB compatibility?

A: The LLS2W271MELB has a maximum seated height of 1.378" compared to 1.457" for the original part. This 0.079" (2.00 mm) reduction is a dimensional advantage that provides additional clearance in space-constrained designs. The difference does not create compatibility issues; it only reduces the vertical footprint.

Q: Which substitute part should be selected for high-temperature applications?

A: The 450VXG270MEFCSN30X35 (Rubycon VXG Series) is optimized for high-temperature operation, with an extended operating range to 105°C and a 5000-hour lifetime at 105°C. The B43644B5277M000 also supports 105°C operation with equivalent lifetime specifications. Both are suitable for elevated ambient temperature environments.

Q: Are the ripple current ratings interchangeable?

A: Ripple current ratings vary among the substitute parts due to different ESR characteristics and thermal designs. The ESMM451VSN271MR35S and LLS2W271MELB both support 1.89 A at 120 Hz. The B43644B5277M000 supports 1.36 A at 100 Hz, and the 450VXG270MEFCSN30X35 supports 1.51 A at 120 Hz. Selection should match the application's ripple current requirements at the specified frequency.

Q: Can these parts be used interchangeably in existing designs without PCB modification?

A: Yes, with one consideration: the LLS2W271MELB has a reduced height (1.378" vs. 1.457"), which provides additional clearance but does not require PCB modification. All parts share identical lead spacing (10.00 mm), diameter (30.00 mm), and snap-in mounting configuration. Direct substitution is mechanically and electrically compatible.

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