337LBB400M2DF Equivalent & Substitute Parts

Part Overview

The 337LBB400M2DF is a 330 µF, 400 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 through-hole mounting. The part is currently active in production with 1045 pieces in stock inventory. Substitute parts are identified when equivalent capacitance and tolerance values are maintained while voltage ratings, ESR characteristics, or thermal performance specifications may be upgraded to meet enhanced system requirements or address component availability.

Substiute Parts

337LBB400M2DF

Cornell Dubilier / Illinois CapacitorIn Stock: 1121337LBB400M2DF Datasheet

Current PartRFQ

B43508B5337M000

EPCOS - TDK ElectronicsIn Stock: 139341B43508B5337M000 Datasheet

UpgradeRFQ

B43644A5337M000

EPCOS - TDK ElectronicsIn Stock: 2807B43644A5337M000 Datasheet

UpgradeRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitute parts for the 337LBB400M2DF are qualified based on the following criteria:

Core Electrical Parameters (Must Match):

• Capacitance: 330 µF
• Tolerance: ±20%
• Polarization: Polar

Mechanical Parameters (Must Match):

• Lead Spacing: 0.394" (10.00 mm)
• Size / Dimension: 1.181" Dia (30.00 mm)
• Height - Seated (Max): 1.654" (42.00 mm)
• Mounting Type: Through Hole
• Package / Case: Radial, Can - Snap-In

Allowable Upgrade Parameters:

• Voltage - Rated: 400 V or higher
• ESR: Lower values acceptable
• Lifetime @ Temperature: Higher values acceptable
• Operating Temperature Range: Extended upper limit acceptable
• Compliance: ROHS3 Compliant maintained

The identified substitute parts B43508B5337M000 and B43644A5337M000 maintain identical capacitance, tolerance, mechanical dimensions, and mounting configuration while providing upgraded voltage ratings (450 V), improved ESR performance, and extended thermal lifetime specifications.

Parameter Comparison

Engineering Selection Recommendations

B43508B5337M000 Selection Criteria: This EPCOS - TDK Electronics substitute provides a 50 V voltage rating upgrade (450 V vs. 400 V) with approximately 50% ESR reduction (370 mOhm vs. 753.57 mOhm). The operating temperature range extends to 105°C. This part maintains ROHS3 compliance and active product status. Selection is appropriate for applications requiring improved thermal performance or higher voltage margin while maintaining identical mechanical fit and electrical capacitance specifications.

B43644A5337M000 Selection Criteria: This EPCOS - TDK Electronics substitute provides a 50 V voltage rating upgrade (450 V vs. 400 V) with significantly reduced ESR (90 mOhm vs. 753.57 mOhm, approximately 88% reduction). Thermal lifetime is extended to 5000 hours at 105°C. The operating temperature range extends to 105°C. This part maintains ROHS3 compliance and active product status. Selection is appropriate for applications with stringent ESR requirements, extended thermal cycling demands, or systems operating at elevated ambient temperatures.

Both substitute parts are mechanically and electrically compatible with the 337LBB400M2DF footprint and mounting configuration. Selection between substitutes depends on specific application requirements for ESR performance and thermal lifetime specifications.

Frequently Asked Questions (FAQ)

Q: Can B43508B5337M000 or B43644A5337M000 be used as direct replacements for 337LBB400M2DF?

A: Yes. Both substitute parts maintain identical capacitance (330 µF), tolerance (±20%), lead spacing (10.00 mm), physical dimensions (1.181" diameter, 1.654" height), and snap-in mounting configuration. They are mechanically and electrically compatible for through-hole PCB applications.

Q: What is the difference between the two substitute parts?

A: Both B43508B5337M000 and B43644A5337M000 share the same 450 V rating and 330 µF capacitance. The primary differences are: B43508B5337M000 has 370 mOhm ESR with 3000-hour lifetime at 105°C; B43644A5337M000 has 90 mOhm ESR with 5000-hour lifetime at 105°C. B43644A5337M000 provides superior ESR performance and extended thermal endurance.

Q: Are the substitute parts RoHS compliant?

A: Yes. Both B43508B5337M000 and B43644A5337M000 are ROHS3 compliant, matching the compliance status of the 337LBB400M2DF.

Q: What is the voltage rating difference, and does it affect compatibility?

A: The 337LBB400M2DF is rated at 400 V, while both substitutes are rated at 450 V. The higher voltage rating in substitute parts provides additional voltage margin and does not negatively affect compatibility. The substitutes can be used in circuits designed for 400 V operation.

Q: How do ESR values affect circuit performance?

A: ESR (Equivalent Series Resistance) affects ripple current handling and heat generation. Lower ESR values reduce resistive losses and heat dissipation. B43644A5337M000 with 90 mOhm ESR provides superior performance in high-ripple-current applications compared to the main part (753.57 mOhm) or B43508B5337M000 (370 mOhm).

Q: Are all three parts suitable for -40°C to 85°C operating range?

A: Yes. The 337LBB400M2DF operates from -40°C to 85°C. Both substitute parts operate from -40°C to 105°C, which encompasses the original temperature range. Substitutes are suitable for applications within the original temperature specification.

Q: What does "Snap-In" mounting mean?

A: Snap-In refers to the mechanical connection method where the capacitor leads are inserted into snap-fit connectors on the PCB or power module, rather than being soldered. All three parts use this identical mounting style.

Q: Can these parts be used interchangeably on the same PCB?

A: Yes. All three parts have identical lead spacing (10.00 mm), diameter (30.00 mm), and height (42.00 mm). They use the same snap-in connector interface and can be physically and electrically interchanged on PCBs designed for the 337LBB400M2DF.