397LMX400M2EE Equivalent & Substitute Parts

Part Overview

The 397LMX400M2EE is a 390 µF, 400 V aluminum electrolytic capacitor manufactured by Cornell Dubilier / Illinois Capacitor in the LMX series. This radial, can-style snap-in capacitor is designed for general-purpose applications requiring through-hole mounting. The part is currently active in production with 924 units in stock. Substitute parts are identified when equivalent capacitance and voltage ratings are required but alternative manufacturers or improved electrical characteristics are preferred for specific application requirements.

Key Parameters

Parameter	Value	Unit
Capacitance	390	µF
Tolerance	±20%	-
Voltage - Rated	400	V
ESR @ 120Hz	1.0048	Ohm
Lifetime @ 105°C	5000	Hrs
Operating Temperature Range	-25°C ~ 105°C	-
Ripple Current @ 120 Hz	1.7	A
Lead Spacing	10.00	mm
Diameter	35.00	mm
Height (Seated Max)	37.00	mm
Package Type	Radial, Can - Snap-In	-
Mounting Type	Through Hole	-
RoHS Status	ROHS3 Compliant	-

Substitute Part Grouping Explanation

Substitution of the 397LMX400M2EE is determined by the following critical parameters:

Mandatory Matching Criteria:

Capacitance: 390 µF (±20% tolerance)
Package Type: Radial, Can - Snap-In
Mounting Type: Through Hole
Lead Spacing: 10.00 mm
Physical Dimensions: 35.00 mm diameter, 37.00 mm height (seated max)
Polarization: Polar

Voltage Compatibility: Substitute parts must operate at or above the rated voltage of 400 V. Parts with higher voltage ratings (450 V or greater) are acceptable for direct substitution in applications designed for 400 V operation.

Electrical Performance: Substitute parts must maintain the same capacitance value and tolerance. ESR, ripple current, and lifetime characteristics may vary between manufacturers while remaining suitable for general-purpose applications.

Compliance Requirements: All substitute parts must maintain RoHS3 compliance and REACH unaffected status to ensure regulatory compatibility.

The B43644B5397M000 qualifies as a substitute based on identical capacitance, tolerance, package configuration, physical dimensions, and lead spacing, with an elevated voltage rating of 450 V.

Parameter Comparison

Parameter	397LMX400M2EE (Cornell Dubilier)	B43644B5397M000 (EPCOS - TDK)
Capacitance	390 µF	390 µF
Tolerance	±20%	±20%
Voltage - Rated	400 V	450 V
ESR	1.0048 Ohm @ 120Hz	270 mOhm @ 100Hz
Lifetime @ 105°C	5000 Hrs	5000 Hrs
Operating Temperature Range	-25°C ~ 105°C	-40°C ~ 105°C
Ripple Current @ Low Frequency	1.7 A @ 120 Hz	1.8 A @ 100 Hz
Lead Spacing	10.00 mm	10.00 mm
Diameter	35.00 mm	35.00 mm
Height (Seated Max)	37.00 mm	37.00 mm
Package Type	Radial, Can - Snap-In	Radial, Can - Snap-In
Mounting Type	Through Hole	Through Hole
RoHS Status	ROHS3 Compliant	ROHS3 Compliant
REACH Status	REACH Unaffected	REACH Unaffected

Engineering Selection Recommendations

Primary Part: 397LMX400M2EE

The Cornell Dubilier / Illinois Capacitor 397LMX400M2EE is the specified component for applications requiring a 390 µF, 400 V aluminum electrolytic capacitor with snap-in mounting. This part maintains active production status and is ROHS3 compliant with REACH unaffected designation. Selection of this part is appropriate when the original design specification calls for the LMX series or when Cornell Dubilier sourcing is required.

Substitute Part: B43644B5397M000

The EPCOS - TDK Electronics B43644B5397M000 is a direct substitute for the 397LMX400M2EE. This part shares identical capacitance, tolerance, package configuration, physical dimensions, and lead spacing. The B43644B5397M000 features a 450 V rated voltage, which exceeds the 400 V requirement and provides additional voltage margin. The substitute part maintains ROHS3 compliance and REACH unaffected status. The B43644B5397M000 is suitable for applications where EPCOS - TDK sourcing is preferred or where the enhanced voltage rating provides system-level benefits. Both parts are currently in active production.

Frequently Asked Questions (FAQ)

Q: Can the B43644B5397M000 be used in place of the 397LMX400M2EE?

A: Yes. The B43644B5397M000 is a direct substitute. Both parts have identical capacitance (390 µF), tolerance (±20%), package type (radial, can - snap-in), physical dimensions (35.00 mm diameter, 37.00 mm height), and lead spacing (10.00 mm). The substitute part has a higher voltage rating (450 V versus 400 V), which is acceptable for applications designed for 400 V operation.

Q: What are the physical compatibility requirements for substitution?

A: Substitute parts must have identical lead spacing (10.00 mm), diameter (35.00 mm), and seated height (37.00 mm). Both the 397LMX400M2EE and B43644B5397M000 meet these requirements and are compatible with the same through-hole PCB layouts and snap-in mounting fixtures.

Q: Are there differences in electrical performance between these parts?

A: Both parts have identical capacitance (390 µF) and lifetime (5000 Hrs @ 105°C). The ESR values differ due to measurement at different frequencies (1.0048 Ohm @ 120Hz for the 397LMX400M2EE versus 270 mOhm @ 100Hz for the B43644B5397M000). The ripple current ratings are comparable (1.7 A @ 120 Hz versus 1.8 A @ 100 Hz). Both parts are suitable for general-purpose applications.

Q: Do both parts meet regulatory compliance requirements?

A: Yes. Both the 397LMX400M2EE and B43644B5397M000 are ROHS3 compliant and REACH unaffected. Both parts carry EAR99 ECCN classification and the same HTSUS code (8532.22.0040).

Q: What is the operating temperature range for each part?

A: The 397LMX400M2EE operates from -25°C to 105°C. The B43644B5397M000 operates from -40°C to 105°C, providing a wider low-temperature operating range.

Q: Are both parts currently available?

A: Yes. The 397LMX400M2EE has 924 units in stock. The B43644B5397M000 has 2036 units in stock. Both parts maintain active production status.

Request Quote (Ships tomorrow)

Part Number

Quantity

Company

Contact Name

E-mail

Message