B43252A4397M Equivalent & Substitute Parts

Part Overview

The B43252A4397M is a 390 µF, 350 V aluminum electrolytic capacitor manufactured by EPCOS - TDK Electronics in the B43252 series. This radial, can-type snap-in capacitor is rated for 2000 hours at 105°C and is designed for general-purpose applications. The part is currently active and ROHS3 compliant. Substitute parts are identified when equivalent capacitance and tolerance values are required with improved voltage ratings or extended operational lifetime, while maintaining mechanical and electrical compatibility within the through-hole radial snap-in package format.

Key Parameters

Parameter	Value
Capacitance	390 µF
Tolerance	±20%
Voltage - Rated	350 V
Lifetime @ Temperature	2000 Hrs @ 105°C
Operating Temperature Range	-25°C ~ 105°C
Polarization	Polar
Package / Case	Radial, Can - Snap-In
Mounting Type	Through Hole
Lead Spacing	0.394" (10.00 mm)
Size / Dimension	1.181" Dia (30.00 mm)
Height - Seated (Max)	1.850" (47.00 mm)
RoHS Status	ROHS3 Compliant

Substitute Part Grouping Explanation

Substitute parts for the B43252A4397M are qualified based on the following criteria:

Capacitance Match: All substitutes maintain 390 µF capacitance value
Tolerance Match: All substitutes maintain ±20% tolerance
Voltage Rating: Substitutes rated at 400 V or higher (exceeds or meets the 350 V requirement)
Package Compatibility: All substitutes use radial, can-type snap-in configuration with identical lead spacing (10.00 mm) and diameter (30.00 mm)
Mounting Type: All substitutes are through-hole mounted
Polarization: All substitutes are polar aluminum electrolytic capacitors
Compliance: All substitutes are ROHS3 compliant and REACH unaffected

Substitutes are grouped by voltage rating and operational lifetime, which represent the primary performance differentiators while maintaining full mechanical and electrical interchangeability.

Parameter Comparison

Manufacturer Part Number	Manufacturer	Series	Capacitance	Tolerance	Voltage - Rated	Lifetime @ Temp.	Operating Temperature	Lead Spacing	Size / Dimension	Height - Seated (Max)	RoHS Status
B43252A4397M	EPCOS - TDK Electronics	B43252	390 µF	±20%	350 V	2000 Hrs @ 105°C	-25°C ~ 105°C	0.394" (10.00 mm)	1.181" Dia (30.00 mm)	1.850" (47.00 mm)	ROHS3 Compliant
LKX2G391MESB45	Nichicon	LKX	390 µF	±20%	400 V	2000 Hrs @ 105°C	-25°C ~ 105°C	0.394" (10.00 mm)	1.181" Dia (30.00 mm)	1.850" (47.00 mm)	ROHS3 Compliant
450MXG390MEFCSN30X45	Rubycon	MXG	390 µF	±20%	450 V	3000 Hrs @ 105°C	-25°C ~ 105°C	0.394" (10.00 mm)	1.181" Dia (30.00 mm)	1.850" (47.00 mm)	ROHS3 Compliant
EKMS451VSN391MR45S	Chemi-Con	KMS	390 µF	±20%	450 V	3000 Hrs @ 105°C	-25°C ~ 105°C	0.394" (10.00 mm)	1.181" Dia (30.00 mm)	1.870" (47.50 mm)	ROHS3 Compliant
ELXS451VSN391MR45S	Chemi-Con	LXS	390 µF	±20%	450 V	5000 Hrs @ 105°C	-25°C ~ 105°C	0.394" (10.00 mm)	1.181" Dia (30.00 mm)	1.870" (47.50 mm)	ROHS3 Compliant

Engineering Selection Recommendations

All substitute parts listed are active products with ROHS3 compliance and REACH unaffected status, meeting the same regulatory requirements as the B43252A4397M.

400 V Rated Option: The LKX2G391MESB45 (Nichicon LKX series) provides a direct voltage upgrade from 350 V to 400 V while maintaining identical 2000-hour lifetime at 105°C. This part is suitable for applications requiring higher voltage margin without extended operational lifetime requirements.

450 V Rated Options: The 450MXG390MEFCSN30X45 (Rubycon MXG series) and EKMS451VSN391MR45S (Chemi-Con KMS series) both provide 450 V rating with extended 3000-hour lifetime at 105°C. These parts are suitable for applications requiring significantly higher voltage headroom and moderate lifetime extension.

Extended Lifetime Option: The ELXS451VSN391MR45S (Chemi-Con LXS series) provides the highest voltage rating (450 V) combined with the longest operational lifetime (5000 hours at 105°C). This part is suitable for demanding applications requiring maximum reliability and extended service intervals.

All substitute parts maintain mechanical compatibility with the original B43252A4397M, with maximum seated heights of 1.850" to 1.870", ensuring fit within standard PCB layouts and enclosure constraints.

Frequently Asked Questions (FAQ)

Q: Can I use a 400 V or 450 V rated capacitor in place of the 350 V B43252A4397M?

A: Yes. Higher voltage-rated capacitors are electrically compatible with lower voltage applications. The 400 V and 450 V substitutes will operate safely in circuits designed for 350 V operation.

Q: What is the difference between the 3000-hour and 5000-hour lifetime options?

A: Lifetime rating indicates the expected operational duration at maximum rated temperature (105°C) and rated ripple current. The ELXS451VSN391MR45S (5000 hours) provides extended service life compared to the 450MXG390MEFCSN30X45 and EKMS451VSN391MR45S (3000 hours). Selection depends on application duty cycle and maintenance intervals.

Q: Are all substitute parts mechanically interchangeable with the B43252A4397M?

A: Yes. All substitute parts use identical lead spacing (10.00 mm), diameter (30.00 mm), and radial snap-in package configuration. Maximum seated heights range from 1.850" to 1.870", which is within standard PCB layout tolerances for through-hole radial capacitors.

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

A: Yes. All substitute parts are ROHS3 compliant and REACH unaffected, matching the regulatory status of the B43252A4397M.

Q: Which substitute should I select for general-purpose applications?

A: For general-purpose applications with no extended lifetime requirement, the LKX2G391MESB45 (Nichicon, 400 V, 2000 hours) provides a direct upgrade path. For applications requiring improved reliability margins, the 450MXG390MEFCSN30X45 (Rubycon, 450 V, 3000 hours) or ELXS451VSN391MR45S (Chemi-Con, 450 V, 5000 hours) are suitable alternatives.

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