Equivalent & Substitute Parts for 337LMX400M2EF

Part Overview

The 337LMX400M2EF is a 330 µF, 400 V aluminum electrolytic capacitor manufactured by Cornell Dubilier / Illinois Capacitor in the LMX series. This radial, can-type snap-in capacitor is designed for general-purpose applications with a rated lifetime of 5000 hours at 105°C and an operating temperature range of -25°C to 105°C. The part is currently active in production and RoHS3 compliant.

Equivalent and substitute parts are identified when designs require alternative sourcing due to inventory constraints, supply chain considerations, or when design specifications permit operation with modified electrical characteristics such as higher voltage ratings or extended lifetime ratings.

Substiute Parts

337LMX400M2EF

Cornell Dubilier / Illinois CapacitorIn Stock: 1114337LMX400M2EF Datasheet

Current PartRFQ

B43505C9337M000

EPCOS - TDK ElectronicsIn Stock: 274164B43505C9337M000 Datasheet

DirectRFQ

ETXH451VSN331MA40S

Chemi-ConIn Stock: 1178ETXH451VSN331MA40S Datasheet

UpgradeRFQ

LGR2G331MELC40

NichiconIn Stock: 273937LGR2G331MELC40 Datasheet

UpgradeRFQ

MAL215957331E3

Vishay Beyschlag/Draloric/BC ComponentsIn Stock: 986MAL215957331E3 Datasheet

UpgradeRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution of the 337LMX400M2EF is determined by the following critical parameters that must remain constant or be exceeded:

Mandatory Matching Parameters:

• Capacitance: 330 µF (exact match required)
• Tolerance: ±20% (exact match required)
• Package / Case: Radial, Can - Snap-In (exact match required)
• Lead Spacing: 0.394" (10.00 mm) (exact match required)
• Physical Dimensions: 1.378" Dia × 1.654" Height (exact match required)
• Mounting Type: Through Hole (exact match required)
• Polarization: Polar (exact match required)

Parameters Permitted to Exceed (Upgrade Criteria):

• Voltage - Rated: May be equal to or greater than 400 V
• Lifetime @ Temp.: May be equal to or greater than 5000 Hrs @ 105°C
• Operating Temperature Range: May be equal to or broader than -25°C ~ 105°C

Parameters Not Constraining Substitution:

• ESR (Equivalent Series Resistance): Varies by manufacturer design
• Ripple Current: Varies by manufacturer design
• Product Status: Active or Not For New Designs both acceptable for equivalent substitution

Four substitute parts meet these criteria and are grouped as follows:

Direct Equivalent (Same Voltage, Same Lifetime):

• B43505C9337M000 (EPCOS - TDK Electronics)

Upgrade Options (Higher Voltage and/or Extended Lifetime):

• ETXH451VSN331MA40S (Chemi-Con) - 450 V, 10000 Hrs @ 105°C
• LGR2G331MELC40 (Nichicon) - 400 V, 10000 Hrs @ 105°C
• MAL215957331E3 (Vishay Beyschlag/Draloric/BC Components) - 450 V, 5000 Hrs @ 105°C

Parameter Comparison

Engineering Selection Recommendations

For Direct Equivalent Substitution (Same Electrical Performance):

The B43505C9337M000 from EPCOS - TDK Electronics provides a direct equivalent to the 337LMX400M2EF. Both parts share identical capacitance, voltage rating, tolerance, physical dimensions, and lifetime specifications. The B43505C9337M000 offers an extended operating temperature range (-40°C to 105°C versus -25°C to 105°C), which provides additional margin in cold environments. However, this part carries a "Not For New Designs" product status, indicating it is suitable for replacement and maintenance applications but not recommended for new product development. Both parts are ROHS3 compliant.

For Upgraded Performance (Extended Lifetime):

The LGR2G331MELC40 from Nichicon and ETXH451VSN331MA40S from Chemi-Con both provide extended lifetime ratings of 10000 hours at 105°C, compared to 5000 hours for the original part. The LGR2G331MELC40 maintains the 400 V rating, while the ETXH451VSN331MA40S increases the voltage rating to 450 V. Both are active products with current manufacturing status. These upgrades are suitable when design specifications permit higher voltage operation or when extended operational life is required.

For Upgraded Performance (Higher Voltage):

The MAL215957331E3 from Vishay Beyschlag/Draloric/BC Components provides a 450 V rating while maintaining the 5000-hour lifetime. This upgrade is suitable when circuit voltage margins require higher-rated components. The part is active and ROHS3 compliant.

Compliance Considerations:

All substitute parts maintain RoHS compliance. The 337LMX400M2EF, B43505C9337M000, LGR2G331MELC40, and MAL215957331E3 are ROHS3 compliant. The ETXH451VSN331MA40S is RoHS compliant. All parts are REACH unaffected and classified as EAR99 for export control purposes.

Frequently Asked Questions (FAQ)

Q: Can B43505C9337M000 be used as a direct replacement for 337LMX400M2EF?

A: Yes. The B43505C9337M000 matches all critical parameters: 330 µF capacitance, ±20% tolerance, 400 V rating, identical physical dimensions (1.378" diameter × 1.654" height), 10.00 mm lead spacing, radial snap-in package, and through-hole mounting. Both have 5000-hour lifetime ratings at 105°C. The B43505C9337M000 extends the lower operating temperature to -40°C. The primary difference is product status: B43505C9337M000 is marked "Not For New Designs," making it suitable for replacement applications.

Q: What is the difference between the upgrade options?

A: Three upgrade options are available. LGR2G331MELC40 maintains 400 V but extends lifetime to 10000 hours. ETXH451VSN331MA40S increases voltage to 450 V and extends lifetime to 10000 hours. MAL215957331E3 increases voltage to 450 V while maintaining 5000-hour lifetime. Selection depends on whether the application requires extended lifetime, higher voltage margin, or both.

Q: Are all substitute parts physically identical to the original?

A: Yes. All substitute parts share identical physical dimensions: 1.378" diameter, 1.654" maximum seated height, 0.394" (10.00 mm) lead spacing, radial snap-in package configuration, and through-hole mounting type. They are mechanically interchangeable on PCBs designed for the 337LMX400M2EF.

Q: Can I use a 450 V rated capacitor in a circuit designed for 400 V?

A: Yes. A higher voltage-rated capacitor can be used in a lower voltage application. The 450 V rated parts (ETXH451VSN331MA40S and MAL215957331E3) are suitable replacements in 400 V circuits. The higher voltage rating provides additional safety margin and does not negatively affect circuit performance.

Q: What is the significance of "Not For New Designs" status?

A: This designation indicates the part is in mature production and suitable for replacement, repair, and maintenance of existing equipment, but manufacturers do not recommend it for new product development. The B43505C9337M000 carries this status. For new designs, the active-status alternatives (LGR2G331MELC40, ETXH451VSN331MA40S, MAL215957331E3) are preferred.

Q: Are all substitute parts RoHS compliant?

A: Yes. The 337LMX400M2EF, B43505C9337M000, LGR2G331MELC40, and MAL215957331E3 are ROHS3 compliant. The ETXH451VSN331MA40S is RoHS compliant. All meet environmental regulatory requirements for restricted substances.

Q: How do I select between substitute parts if multiple options are available?

A: Selection is based on application requirements. For direct replacement with identical specifications, use B43505C9337M000. For extended operational life (10000 hours), choose LGR2G331MELC40 (400 V) or ETXH451VSN331MA40S (450 V). For higher voltage margin with standard lifetime, use MAL215957331E3 (450 V). For new designs, prioritize active-status parts: LGR2G331MELC40, ETXH451VSN331MA40S, or MAL215957331E3.