B43231C397M Equivalent & Substitute Parts

Part Overview

The B43231C397M is a 390 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 ROHS3 compliant and currently active in production with 1091 units in stock.

Equivalent and substitute parts are identified when design requirements allow for higher voltage ratings, extended operational lifetimes, or alternative manufacturer sourcing while maintaining the same capacitance value, tolerance, physical dimensions, and mounting configuration.

Key Parameters

Parameter	Value
Capacitance	390 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	1.378" Dia (35.00 mm)
Height - Seated (Max)	1.260" (32.00 mm)
Mounting Type	Through Hole
Package / Case	Radial, Can - Snap-In
Polarization	Polar
RoHS Status	ROHS3 Compliant

Substitute Part Grouping Explanation

Substitute parts for the B43231C397M are grouped by voltage rating and manufacturer. All substitutes maintain the following critical parameters:

Capacitance: 390 µF (exact match)
Tolerance: ±20% (exact match)
Lead Spacing: 0.394" (10.00 mm) (exact match)
Physical Dimensions: 1.378" Dia × 1.260" Height (exact match)
Mounting Type: Through Hole, Radial, Can - Snap-In (exact match)
Polarization: Polar (exact match)

Substitution is permitted when the rated voltage equals or exceeds the original 315 V specification, provided the physical footprint and mounting configuration remain identical. Extended lifetime ratings and higher operating temperature ranges represent performance enhancements rather than functional changes.

Parameter Comparison

Part Number	Manufacturer	Series	Capacitance	Voltage (V)	Lifetime @ Temp	Operating Temp Range	Lead Spacing	Size (Dia)	Height (Max)	RoHS Status
B43231C397M	EPCOS - TDK	B43231	390 µF	315	2000 Hrs @ 85°C	-25°C ~ 85°C	0.394" (10.00 mm)	1.378" (35.00 mm)	1.260" (32.00 mm)	ROHS3
B43634C9397M000	EPCOS - TDK	B43634	390 µF	400	8000 Hrs @ 85°C	-25°C ~ 85°C	0.394" (10.00 mm)	1.378" (35.00 mm)	1.260" (32.00 mm)	ROHS3
400MXG390MEFCSN35X30	Rubycon	MXG	390 µF	400	3000 Hrs @ 105°C	-25°C ~ 105°C	0.394" (10.00 mm)	1.378" (35.00 mm)	1.260" (32.00 mm)	ROHS3
ESMQ401VSN391MA30S	Chemi-Con	SMQ	390 µF	400	2000 Hrs @ 85°C	-25°C ~ 85°C	0.394" (10.00 mm)	1.378" (35.00 mm)	1.260" (32.00 mm)	RoHS
ESMQ421VSN391MA30S	Chemi-Con	SMQ	390 µF	420	2000 Hrs @ 85°C	-25°C ~ 85°C	0.394" (10.00 mm)	1.378" (35.00 mm)	1.260" (32.00 mm)	RoHS
ESMQ451VSN391MA30S	Chemi-Con	SMQ	390 µF	450	2000 Hrs @ 85°C	-25°C ~ 85°C	0.394" (10.00 mm)	1.378" (35.00 mm)	1.260" (32.00 mm)	RoHS
LGG2G391MELC30	Nichicon	LGG	390 µF	400	2000 Hrs @ 105°C	-25°C ~ 105°C	0.394" (10.00 mm)	1.378" (35.00 mm)	1.260" (32.00 mm)	ROHS3
LGGW6391MELC30	Nichicon	LGG	390 µF	420	2000 Hrs @ 105°C	-25°C ~ 105°C	0.394" (10.00 mm)	1.378" (35.00 mm)	1.260" (32.00 mm)	ROHS3
LGL2W391MELC30	Nichicon	LGL	390 µF	450	2000 Hrs @ 105°C	-25°C ~ 105°C	0.394" (10.00 mm)	1.378" (35.00 mm)	1.260" (32.00 mm)	ROHS3
LGN2G391MELC30	Nichicon	LGN	390 µF	400	3000 Hrs @ 105°C	-25°C ~ 105°C	0.394" (10.00 mm)	1.378" (35.00 mm)	1.260" (32.00 mm)	ROHS3
LGX2G391MELC30	Nichicon	LGX	390 µF	400	5000 Hrs @ 105°C	-25°C ~ 105°C	0.394" (10.00 mm)	1.378" (35.00 mm)	1.260" (32.00 mm)	ROHS3

Engineering Selection Recommendations

All substitute parts listed are active products with ROHS3 or RoHS compliance status. Selection among substitutes depends on application voltage requirements and thermal performance specifications:

For 315 V applications, the B43231C397M remains the direct specification match. When circuit design permits higher voltage operation, 400 V rated substitutes (B43634C9397M000, ESMQ401VSN391MA30S, LGG2G391MELC30, LGN2G391MELC30, LGX2G391MELC30) provide equivalent or extended operational lifetime. The 420 V and 450 V rated options (ESMQ421VSN391MA30S, ESMQ451VSN391MA30S, LGGW6391MELC30, LGL2W391MELC30) are suitable for applications with higher voltage margins.

Extended lifetime ratings at elevated temperatures (105°C) are available from Nichicon (LGG, LGN, LGX series) and Rubycon (MXG series) for applications requiring enhanced thermal performance. EPCOS B43634C9397M000 offers 8000-hour lifetime at 85°C within the same manufacturer family.

Frequently Asked Questions (FAQ)

Q: Can I substitute a 400 V rated capacitor for a 315 V specification?

A: Yes. All 400 V, 420 V, and 450 V rated substitutes are electrically compatible with 315 V circuit requirements. Higher voltage ratings provide additional safety margin and do not affect circuit operation when the capacitance and tolerance remain identical.

Q: Are the physical dimensions identical across all substitute parts?

A: Yes. All substitute parts maintain the same lead spacing (0.394" / 10.00 mm), diameter (1.378" / 35.00 mm), and height (1.260" / 32.00 mm). Direct PCB footprint compatibility is confirmed for all listed substitutes.

Q: What is the difference between ROHS3 and RoHS compliance?

A: Both designations indicate compliance with Restriction of Hazardous Substances regulations. ROHS3 represents the current EU directive version. All parts listed meet hazardous substance restrictions and are suitable for applications requiring RoHS compliance.

Q: Which substitute offers the longest operational lifetime?

A: LGX2G391MELC30 (Nichicon) provides 5000 hours at 105°C, the extended lifetime option among 400 V rated substitutes. For 85°C operation, B43634C9397M000 (EPCOS) offers 8000 hours.

Q: Can I use a substitute with a higher operating temperature range?

A: Yes. Substitutes rated for -25°C ~ 105°C operation are compatible with applications requiring -25°C ~ 85°C performance. The extended temperature range represents a performance enhancement with no functional impact on standard temperature applications.

Q: Are all substitute parts currently in stock?

A: Inventory status is provided for reference. Availability should be confirmed with the component supplier for production requirements.

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