Equivalent & Substitute Parts for 397LBB350M2DF

Part Overview

The 397LBB350M2DF is a 390 µF, 350 V aluminum electrolytic capacitor manufactured by Cornell Dubilier / Illinois Capacitor in the LBB series. This radial, can-style snap-in capacitor is designed for general-purpose applications requiring stable capacitance and reliable performance across extended operating temperatures. The part maintains Active product status with 895 units currently in stock. Substitute parts are identified to address inventory availability, extended operating temperature ranges, or improved electrical characteristics while maintaining functional equivalence within specified parameters.

Key Parameters

Parameter	Value	Unit
Capacitance	390	µF
Voltage - Rated	350	V
Tolerance	±20%	-
Operating Temperature Range	-40°C ~ 85°C	-
Lifetime @ Temperature	3000 Hrs @ 85°C	-
ESR @ Reference Frequency	637.64 mOhm @ 120 Hz	-
Lead Spacing	10.00	mm
Case Diameter	30.00	mm
Height - Seated (Max)	42.00	mm
Package / Case	Radial, Can - Snap-In	-
Mounting Type	Through Hole	-
RoHS Status	ROHS3 Compliant	-

Substitute Part Grouping Explanation

Substitution of the 397LBB350M2DF is determined by strict equivalence in the following parameters:

Critical Parameters (Must Match):

Capacitance: 390 µF
Tolerance: ±20%
Package / Case: Radial, Can - Snap-In
Lead Spacing: 10.00 mm
Case Diameter: 30.00 mm
Height - Seated (Max): 42.00 mm
Mounting Type: Through Hole
Polarization: Polar

Allowable Variation Parameters:

Voltage - Rated: Equal to or greater than 350 V
Operating Temperature Range: Equal to or greater than -40°C ~ 85°C
Lifetime @ Temperature: Equal to or greater than 3000 Hrs @ 85°C
ESR: Lower values are acceptable (improved performance)
RoHS Status: ROHS3 Compliant maintained

The substitute part B43544B9397M000 meets all critical parameters and provides improvements in voltage rating (400 V vs. 350 V), operating temperature range (-40°C ~ 105°C vs. -40°C ~ 85°C), and ESR performance (150 mOhm @ 100 Hz vs. 637.64 mOhm @ 120 Hz).

Parameter Comparison

Parameter	397LBB350M2DF (Main Part)	B43544B9397M000 (Substitute)	Compatibility
Manufacturer	Cornell Dubilier / Illinois Capacitor	EPCOS - TDK Electronics	Different manufacturer
Series	LBB	B43544	Different series
Capacitance	390 µF	390 µF	Equivalent
Tolerance	±20%	±20%	Equivalent
Voltage - Rated	350 V	400 V	Substitute rated higher
Operating Temperature Range	-40°C ~ 85°C	-40°C ~ 105°C	Substitute rated higher
Lifetime @ Temperature	3000 Hrs @ 85°C	3000 Hrs @ 105°C	Substitute rated higher
ESR @ Reference Frequency	637.64 mOhm @ 120 Hz	150 mOhm @ 100 Hz	Substitute has lower ESR
Lead Spacing	10.00 mm	10.00 mm	Equivalent
Case Diameter	30.00 mm	30.00 mm	Equivalent
Height - Seated (Max)	42.00 mm	42.00 mm	Equivalent
Package / Case	Radial, Can - Snap-In	Radial, Can - Snap-In	Equivalent
Mounting Type	Through Hole	Through Hole	Equivalent
RoHS Status	ROHS3 Compliant	ROHS3 Compliant	Equivalent
Product Status	Active	Active	Both active

Engineering Selection Recommendations

397LBB350M2DF Selection Criteria:

Applications operating at or below 85°C ambient temperature
Systems designed for 350 V nominal voltage rating
Designs where ESR characteristics at 120 Hz are specified
Preference for Cornell Dubilier / Illinois Capacitor sourcing

B43544B9397M000 Selection Criteria:

Applications requiring extended operating temperature range up to 105°C
Systems benefiting from higher voltage margin (400 V rating)
Designs where lower ESR performance improves ripple current handling
EPCOS - TDK Electronics supply chain availability
Both parts maintain ROHS3 compliance and Active product status

Both parts are suitable for general-purpose aluminum electrolytic capacitor applications with identical mechanical footprints and electrical capacitance values. Selection between them depends on thermal environment requirements and voltage margin specifications.

Frequently Asked Questions (FAQ)

Q: Can B43544B9397M000 directly replace 397LBB350M2DF in existing designs?

A: Yes. Both parts share identical capacitance (390 µF), tolerance (±20%), mechanical dimensions (30 mm diameter, 42 mm height, 10 mm lead spacing), and package type (Radial, Can - Snap-In). The substitute part provides equal or superior performance in voltage rating, operating temperature range, and ESR characteristics.

Q: What are the key differences between these two parts?

A: The primary differences are manufacturer (Cornell Dubilier vs. EPCOS - TDK Electronics), voltage rating (350 V vs. 400 V), maximum operating temperature (85°C vs. 105°C), and ESR performance (637.64 mOhm vs. 150 mOhm). All differences favor the substitute part or are neutral.

Q: Are the mechanical dimensions identical?

A: Yes. Both parts have identical lead spacing (10.00 mm), case diameter (30.00 mm), and seated height (42.00 mm). PCB footprints and mounting requirements are identical.

Q: Does the higher voltage rating of B43544B9397M000 affect circuit compatibility?

A: No. A capacitor with higher voltage rating is compatible in circuits designed for lower voltage ratings. The 400 V rating of B43544B9397M000 provides additional safety margin in 350 V applications.

Q: Are both parts RoHS compliant?

A: Yes. Both 397LBB350M2DF and B43544B9397M000 are ROHS3 compliant.

Q: What is the significance of the lower ESR in the substitute part?

A: Lower ESR (150 mOhm vs. 637.64 mOhm) in B43544B9397M000 results in reduced heat generation and improved ripple current handling capability, which can extend component life in high-ripple-current applications.

Q: Can I use B43544B9397M000 in applications limited to 85°C operation?

A: Yes. B43544B9397M000 is rated for -40°C ~ 105°C operation, which includes the -40°C ~ 85°C range of the original part. The extended temperature rating does not restrict use in lower-temperature applications.

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