397LBB250M2CD Equivalent & Substitute Parts Reference

Part Overview

The 397LBB250M2CD is a 390 µF, 250 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 901 units currently in stock. Equivalent and substitute parts are identified to support procurement flexibility, inventory management, and supply chain continuity when the primary part becomes unavailable or when alternative sourcing is required.

Substiute Parts

397LBB250M2CD

Cornell Dubilier / Illinois CapacitorIn Stock: 1011397LBB250M2CD Datasheet

Current PartRFQ

B43509F2397M000

EPCOS - TDK ElectronicsIn Stock: 1426B43509F2397M000 Datasheet

UpgradeRFQ

LLS2E391MELA

NichiconIn Stock: 836LLS2E391MELA Datasheet

Parametric EquivalentRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitute parts for the 397LBB250M2CD are qualified based on strict electrical and mechanical parameter alignment. The substitution criteria are:

Primary Matching Parameters:

• Capacitance: 390 µF (exact match required)
• Tolerance: ±20% (exact match required)
• Voltage Rating: 250 V (exact match required)
• Package Type: Radial, Can - Snap-In (exact match required)
• Lead Spacing: 0.394" (10.00mm) (exact match required)
• Physical Dimensions: 0.984" Dia × 1.260" Height (exact match required)
• Mounting Type: Through Hole (exact match required)
• Polarization: Polar (exact match required)

Secondary Compliance Parameters:

• RoHS3 Compliance (required)
• REACH Unaffected status (required)
• Operating temperature range compatibility with application requirements

Two substitute parts meet these criteria:

1. B43509F2397M000 (EPCOS - TDK Electronics): Upgrade substitute with enhanced thermal performance (3000 Hrs @ 105°C vs. 3000 Hrs @ 85°C) and improved ESR characteristics (220 mOhm @ 100Hz).

2. LLS2E391MELA (Nichicon): Parametric equivalent maintaining identical thermal lifetime specification (3000 Hrs @ 85°C) and operating temperature range.

Parameter Comparison

Engineering Selection Recommendations

B43509F2397M000 (EPCOS - TDK Electronics) is classified as an upgrade substitute. This part maintains all critical electrical and mechanical parameters while providing enhanced thermal performance with an operating temperature range extended to 105°C and a lifetime specification of 3000 Hrs @ 105°C. The ESR is reduced to 220 mOhm @ 100Hz, indicating improved electrical efficiency. This part is ROHS3 compliant and REACH unaffected. Selection of this substitute is appropriate for applications where extended thermal margin or improved ESR performance is beneficial, with 1396 units available in inventory.

LLS2E391MELA (Nichicon) is classified as a parametric equivalent. This part matches the primary electrical specifications (390 µF, ±20%, 250 V) and maintains identical operating temperature range (-40°C ~ 85°C) and thermal lifetime (3000 Hrs @ 85°C) as the original part. Physical dimensions and mounting characteristics are identical. This part is ROHS3 compliant and REACH unaffected. Selection of this substitute is appropriate for direct replacement applications requiring equivalent performance characteristics, with 796 units available in inventory.

Both substitute parts are Active status products suitable for procurement and integration into existing designs without modification to PCB layout or mechanical assembly.

Frequently Asked Questions (FAQ)

Q: Can B43509F2397M000 be used as a direct replacement for 397LBB250M2CD?

A: Yes. B43509F2397M000 meets all critical electrical and mechanical parameters: 390 µF capacitance, ±20% tolerance, 250 V rating, identical physical dimensions (0.984" Dia × 1.260" Height), 10.00mm lead spacing, and radial snap-in package. The extended operating temperature range (105°C vs. 85°C) and improved ESR do not prevent direct substitution; they represent performance enhancements.

Q: Can LLS2E391MELA be used as a direct replacement for 397LBB250M2CD?

A: Yes. LLS2E391MELA matches all critical specifications: 390 µF capacitance, ±20% tolerance, 250 V rating, identical physical dimensions, 10.00mm lead spacing, and radial snap-in package. Operating temperature range and thermal lifetime are identical to the original part.

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

A: B43509F2397M000 offers extended thermal performance (105°C operating temperature, 3000 Hrs @ 105°C) and lower ESR (220 mOhm @ 100Hz). LLS2E391MELA maintains the original thermal specifications (85°C operating temperature, 3000 Hrs @ 85°C). Both are electrically and mechanically equivalent to the original part.

Q: Are all three parts RoHS3 compliant?

A: Yes. The 397LBB250M2CD, B43509F2397M000, and LLS2E391MELA are all ROHS3 compliant and REACH unaffected.

Q: Will the substitute parts fit the same PCB footprint?

A: Yes. All three parts share identical lead spacing (0.394" / 10.00mm), physical diameter (0.984" / 25.00mm), and maximum seated height (1.260" / 32.00mm). No PCB layout modification is required.

Q: Which substitute should I select for a new design?

A: Selection depends on application thermal requirements. For applications operating at or below 85°C, either substitute is suitable. For applications requiring extended thermal margin or operating near 85°C, B43509F2397M000 is recommended due to its 105°C rating and improved ESR characteristics.

Q: Are these parts suitable for general-purpose applications?

A: Yes. All three parts are rated for general-purpose applications and maintain identical polarization (polar) and mounting type (through hole).