B43231B337M Equivalent & Substitute Parts

Part Overview

The B43231B337M is a 330 µF, 315 V aluminum electrolytic capacitor manufactured by EPCOS - TDK Electronics in the B43231 series. This radial, can-type snap-in capacitor is rated for 2000 hours at 85°C and is designed for general-purpose applications requiring through-hole mounting. The part is active in production and RoHS3 compliant.

Equivalent and substitute parts are identified when design requirements allow for higher voltage ratings, extended operating temperature ranges, or improved lifetime specifications while maintaining the same capacitance value, tolerance, lead spacing, and mechanical form factor.

Key Parameters

Parameter	Value
Capacitance	330 µF
Tolerance	±20%
Voltage - Rated	315 V
Lifetime @ Temperature	2000 Hrs @ 85°C
Operating Temperature Range	-25°C ~ 85°C
Lead Spacing	0.394" (10.00 mm)
Size / Dimension	1.000" Dia (25.40 mm)
Height - Seated (Max)	1.654" (42.00 mm)
Mounting Type	Through Hole
Package / Case	Radial, Can - Snap-In
Polarization	Polar
RoHS Status	ROHS3 Compliant

Substitute Part Grouping Explanation

Substitution of the B43231B337M is permissible when the following conditions are met:

Capacitance value remains 330 µF
Tolerance remains ±20%
Voltage rating is equal to or greater than 315 V
Lead spacing is 0.394" (10.00 mm)
Package type is Radial, Can - Snap-In
Mounting type is Through Hole
Polarization is Polar

Substitute parts may differ in:

Rated voltage (higher values acceptable for designs with voltage margin)
Operating temperature range (extended ranges acceptable)
Lifetime specification at rated temperature (extended lifetimes acceptable)
Physical dimensions within compatible envelope (minor variations acceptable if mounting compatibility is maintained)
Manufacturer and series designation

Parameter Comparison

Parameter	B43231B337M (Main)	ESMR451VSN331MQ40S	LGG2G331MELA40	LGN2V331MELA40	LQS2V331MELA40
Manufacturer	EPCOS - TDK Electronics	Chemi-Con	Nichicon	Nichicon	Nichicon
Series	B43231	SMR	LGG	LGN	LQS
Capacitance	330 µF	330 µF	330 µF	330 µF	330 µF
Tolerance	±20%	±20%	±20%	±20%	±20%
Voltage - Rated	315 V	450 V	400 V	350 V	350 V
Lifetime @ Temperature	2000 Hrs @ 85°C	2000 Hrs @ 85°C	2000 Hrs @ 105°C	3000 Hrs @ 105°C	3000 Hrs @ 105°C
Operating Temperature Range	-25°C ~ 85°C	-25°C ~ 85°C	-25°C ~ 105°C	-25°C ~ 105°C	-25°C ~ 105°C
Lead Spacing	0.394" (10.00 mm)	0.394" (10.00 mm)	0.394" (10.00 mm)	0.394" (10.00 mm)	0.394" (10.00 mm)
Size / Dimension	1.000" Dia (25.40 mm)	1.000" Dia (25.40 mm)	0.984" Dia (25.00 mm)	0.984" Dia (25.00 mm)	0.984" Dia (25.00 mm)
Height - Seated (Max)	1.654" (42.00 mm)	1.673" (42.50 mm)	1.654" (42.00 mm)	1.654" (42.00 mm)	1.654" (42.00 mm)
Mounting Type	Through Hole	Through Hole	Through Hole	Through Hole	Through Hole
Package / Case	Radial, Can - Snap-In	Radial, Can - Snap-In	Radial, Can - Snap-In	Radial, Can - Snap-In	Radial, Can - Snap-In
RoHS Status	ROHS3 Compliant	RoHS Compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant
Product Status	Active	Active	Active	Active	Active

Engineering Selection Recommendations

All substitute parts listed are active products from established manufacturers with appropriate compliance certifications. Selection among these equivalents depends on application-specific requirements:

ESMR451VSN331MQ40S (Chemi-Con SMR series) provides the highest voltage rating at 450 V, suitable for applications requiring maximum voltage margin. This part maintains the same temperature rating as the main part (85°C maximum) and identical lifetime specification.

LGG2G331MELA40 (Nichicon LGG series) offers extended operating temperature range to 105°C with improved lifetime at elevated temperature (2000 Hrs @ 105°C). Physical dimensions are slightly reduced (0.984" diameter versus 1.000").

LGN2V331MELA40 and LQS2V331MELA40 (Nichicon LGN and LQS series) both provide 350 V rating with extended operating temperature to 105°C and enhanced lifetime specification (3000 Hrs @ 105°C). These parts are suitable for applications requiring improved thermal performance and extended service life. Physical dimensions are reduced to 0.984" diameter.

All substitute parts maintain RoHS compliance and REACH unaffected status. All parts are currently in active production with confirmed inventory availability.

Frequently Asked Questions (FAQ)

Q: Can ESMR451VSN331MQ40S replace B43231B337M in all applications?

A: ESMR451VSN331MQ40S is electrically compatible as a direct substitute. The higher 450 V rating provides additional voltage margin. However, the height dimension increases from 1.654" to 1.673", which may affect mechanical fit in space-constrained designs. Verify PCB layout clearance before substitution.

Q: What is the advantage of LGG2G331MELA40 or LQS2V331MELA40 over the main part?

A: These Nichicon parts extend the maximum operating temperature to 105°C and provide longer lifetime specifications (2000-3000 Hrs @ 105°C versus 2000 Hrs @ 85°C). They are suitable for applications subject to elevated ambient temperatures or requiring extended service life. The reduced physical diameter (0.984" versus 1.000") may provide space savings in some designs.

Q: Are there any mechanical compatibility concerns with substitute parts?

A: All substitute parts maintain the same lead spacing (0.394" / 10.00 mm) and snap-in mounting interface. Minor variations in can diameter (0.984" to 1.000") and height (1.654" to 1.673") are within typical PCB layout tolerances for through-hole snap-in capacitors. Verify specific PCB footprint requirements for your application.

Q: Do all substitute parts meet the same compliance standards?

A: All listed substitutes are RoHS compliant and REACH unaffected. The main part and LGG2G331MELA40, LGN2V331MELA40, and LQS2V331MELA40 are ROHS3 compliant. ESMR451VSN331MQ40S is RoHS compliant. Verify specific compliance requirements for your application or end market.

Q: Which substitute part should I select for a high-temperature application?

A: For applications requiring operation above 85°C, select LGG2G331MELA40, LGN2V331MELA40, or LQS2V331MELA40, all rated to 105°C maximum. LGN2V331MELA40 and LQS2V331MELA40 provide the longest lifetime specification at elevated temperature (3000 Hrs @ 105°C).

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