397LMX200M2CD Aluminum Electrolytic Capacitor - Equivalent & Substitute Parts

Part Overview

The 397LMX200M2CD is a 390 µF, 200 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 stable capacitance and extended operational life at elevated temperatures. The part maintains Active product status with 918 units currently in stock.

Substitute parts are identified when equivalent electrical and mechanical parameters align with the original specification, enabling direct replacement in circuit applications without design modification.

Substiute Parts

397LMX200M2CD

Cornell Dubilier / Illinois CapacitorIn Stock: 1018397LMX200M2CD Datasheet

Current PartRFQ

LGX2E391MELA30

NichiconIn Stock: 1149LGX2E391MELA30 Datasheet

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Key Parameters

Substitute Part Grouping Explanation

Substitution eligibility for the 397LMX200M2CD is determined by the following critical parameters:

Mandatory Matching Parameters:

• Capacitance: 390 µF (exact match required)
• Tolerance: ±20% (exact match required)
• Polarization: Polar (exact match required)
• Lead Spacing: 10.00 mm (exact match required)
• Physical Dimensions: 25.00 mm diameter, 32.00 mm height maximum (exact match required)
• Mounting Type: Through Hole (exact match required)
• Package / Case: Radial, Can - Snap-In (exact match required)
• Operating Temperature Range: -25°C to 105°C minimum (exact match or superior required)
• Lifetime @ 105°C: 5000 Hrs minimum (exact match or superior required)

Allowable Variation Parameters:

• Voltage - Rated: Equal or higher voltage rating is acceptable
• ESR: Lower or equal ESR is acceptable
• Ripple Current: Equal or higher ripple current capability is acceptable
• Manufacturer: Different manufacturers permitted if all other parameters align

The substitute part LGX2E391MELA30 meets all mandatory matching criteria and provides superior voltage rating (250 V vs. 200 V), making it electrically compatible for direct replacement.

Parameter Comparison

Engineering Selection Recommendations

Primary Part: 397LMX200M2CD

The 397LMX200M2CD remains the specified component when the circuit design requires exactly 200 V rated voltage and the original manufacturer (Cornell Dubilier / Illinois Capacitor) is mandated by procurement or quality specifications. This part is Active status with established supply (918 units in stock).

Substitute Part: LGX2E391MELA30

The LGX2E391MELA30 (Nichicon, LGX series) is electrically and mechanically compatible for direct replacement. This substitute provides:

• Identical capacitance (390 µF) and tolerance (±20%)
• Higher voltage rating (250 V vs. 200 V), providing additional design margin
• Superior ripple current capability at both low frequency (1.43 A @ 120 Hz vs. 1.32 A) and high frequency (2.145 A @ 50 kHz vs. 1.9404 A)
• Identical physical dimensions and lead spacing for direct PCB mounting
• Identical operating temperature range (-25°C to 105°C)
• Identical lifetime specification (5000 Hrs @ 105°C)
• Full RoHS3 and REACH compliance matching the original part

Both parts carry Active product status and maintain equivalent regulatory compliance (EAR99, HTSUS 8532.22.0040).

Frequently Asked Questions (FAQ)

Q: Can the LGX2E391MELA30 be used as a direct replacement for the 397LMX200M2CD?

A: Yes. The LGX2E391MELA30 meets all mandatory electrical and mechanical parameters. Physical dimensions (25.00 mm diameter, 32.00 mm height, 10.00 mm lead spacing), mounting type (through-hole snap-in), capacitance (390 µF), tolerance (±20%), and operating temperature range (-25°C to 105°C) are identical. The substitute provides higher voltage rating (250 V) and superior ripple current performance.

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

A: The primary differences are manufacturer (Cornell Dubilier vs. Nichicon) and voltage rating (200 V vs. 250 V). The Nichicon substitute also provides higher ripple current capability. All other electrical and mechanical specifications are equivalent or superior in the substitute.

Q: Does the higher voltage rating of the LGX2E391MELA30 affect circuit compatibility?

A: No. A capacitor with higher voltage rating is compatible in circuits designed for lower voltage. The 250 V rating of the substitute provides additional safety margin without affecting circuit operation.

Q: Are the physical dimensions identical for PCB mounting?

A: Yes. Both parts have identical lead spacing (10.00 mm), diameter (25.00 mm), and maximum seated height (32.00 mm). No PCB layout modifications are required.

Q: Do both parts meet the same regulatory requirements?

A: Yes. Both parts are RoHS3 compliant, REACH unaffected, and classified as EAR99 for export control purposes. Both carry HTSUS code 8532.22.0040.

Q: What is the lifetime specification for both parts?

A: Both parts are rated for 5000 hours of operation at 105°C, providing equivalent reliability in thermal stress conditions.

Q: Can the substitute part be used if the original part is out of stock?

A: Yes, provided the circuit design does not mandate a specific manufacturer. The LGX2E391MELA30 is electrically and mechanically equivalent with superior performance characteristics.