277LMB400M2ED Aluminum Electrolytic Capacitor - Equivalent & Substitute Parts

Part Overview

The 277LMB400M2ED is a 270 µF, 400 V aluminum electrolytic capacitor manufactured by Cornell Dubilier / Illinois Capacitor in the LMB series. This radial, snap-in can component is designed for general-purpose applications requiring standard voltage ratings and thermal performance. As an active product with established supply chain presence, substitute parts are identified to provide design flexibility, extended lifetime options, and upgraded voltage specifications when higher reliability margins are required.

Substiute Parts

277LMB400M2ED

Cornell Dubilier / Illinois CapacitorIn Stock: 1014277LMB400M2ED Datasheet

Current PartRFQ

ELXM401VSN271MA30S

Chemi-ConIn Stock: 1137ELXM401VSN271MA30S Datasheet

DirectRFQ

450VXH270MEFCSN35X30

RubyconIn Stock: 1139450VXH270MEFCSN35X30 Datasheet

UpgradeRFQ

B43642C5277M000

EPCOS - TDK ElectronicsIn Stock: 1031B43642C5277M000 Datasheet

UpgradeRFQ

381LX271M400A022

Cornell Dubilier Electronics (CDE)In Stock: 7779381LX271M400A022 Datasheet

Parametric EquivalentRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitute parts for the 277LMB400M2ED are classified into three categories based on their electrical and mechanical compatibility:

Direct Manufacturer Equivalent (ELXM401VSN271MA30S) This substitute maintains the same capacitance (270 µF), tolerance (±20%), voltage rating (400 V), lead spacing (0.394"/10.00mm), physical dimensions (1.378" Dia / 35.00mm), height (1.260" / 32.00mm), and mounting type (Through Hole, Radial Can - Snap-In). The key differentiator is extended lifetime performance: 7000 Hrs @ 105°C versus 3000 Hrs for the main part. This part is manufactured by Chemi-Con and carries equivalent compliance ratings (RoHS Compliant, REACH Unaffected).

Upgrade Substitutes (450VXH270MEFCSN35X30 and B43642C5277M000) These parts share identical capacitance (270 µF) and tolerance (±20%) but feature upgraded voltage ratings of 450 V, providing higher safety margins. Physical dimensions remain compatible: 1.378" Dia (35.00mm), height 1.260" (32.00mm), lead spacing 0.394" (10.00mm), and mounting type (Through Hole, Radial Can - Snap-In). The 450VXH270MEFCSN35X30 (Rubycon) offers 5000 Hrs @ 105°C, while the B43642C5277M000 (EPCOS - TDK Electronics) provides 3000 Hrs @ 105°C with specified ESR of 310 mOhm @ 100Hz and extended operating temperature range (-40°C ~ 105°C).

Parametric Equivalent (381LX271M400A022) This Cornell Dubilier Electronics (CDE) part matches the main part across capacitance (270 µF), tolerance (±20%), voltage rating (400 V), operating temperature (-25°C ~ 105°C), lifetime (3000 Hrs @ 105°C), and physical dimensions (1.378" Dia / 35.00mm, height 1.260" / 32.00mm). Lead spacing and mounting type are identical (0.394" / 10.00mm, Through Hole Radial Can - Snap-In).

Parameter Comparison

Engineering Selection Recommendations

277LMB400M2ED (Cornell Dubilier / Illinois Capacitor) Select this part as the primary choice for applications requiring active-status aluminum electrolytic capacitors with 400 V rating, 270 µF capacitance, and standard thermal performance. ROHS3 compliance ensures environmental and regulatory alignment. This configuration is suitable for general-purpose applications where the 3000 Hrs @ 105°C lifetime rating meets design requirements.

ELXM401VSN271MA30S (Chemi-Con) This direct equivalent is preferred when extended operational lifetime is required. With 7000 Hrs @ 105°C thermal rating, it provides 2.33× the lifetime duration of the main part while maintaining identical voltage, capacitance, and mechanical specifications. RoHS compliance and REACH unaffected status maintain regulatory compliance. Slightly elevated ripple current capability (1.31 A @ 120 Hz) offers marginal performance enhancement.

450VXH270MEFCSN35X30 (Rubycon) Select this upgrade substitute when operating margin improvement is prioritized. The 450 V rating provides 50 V additional voltage headroom over 400 V applications while maintaining 270 µF capacitance and identical mechanical fit (1.378" Dia, 1.260" height, 10.00mm lead spacing). The 5000 Hrs @ 105°C lifetime rating falls between the main part and ELXM401VSN271MA30S. ROHS3 compliance and elevated ripple current (1.48 A @ 120 Hz) support demanding applications.

B43642C5277M000 (EPCOS - TDK Electronics) This upgrade substitute combines 450 V voltage rating with specified ESR (310 mOhm @ 100Hz) and extended low-temperature operating range (-40°C ~ 105°C). Selection is appropriate when thermal margin and low-temperature performance define application requirements. ROHS3 compliance applies. Lead spacing and physical dimensions (1.378" Dia, 1.260" height, 10.00mm spacing) ensure board-level compatibility.

381LX271M400A022 (Cornell Dubilier Electronics) This parametric equivalent from the same manufacturer family as the main part maintains identical 400 V voltage rating, 270 µF capacitance, and thermal specifications (3000 Hrs @ 105°C). Mechanical compatibility is assured across all dimensions and mounting type. ROHS3 compliance and REACH unaffected status apply. This selection is suitable when manufacturer consolidation within the Cornell Dubilier product line is advantageous.

Frequently Asked Questions (FAQ)

Q: Can these substitute parts be used interchangeably with the 277LMB400M2ED in existing circuit designs? A: Substitutes sharing identical voltage rating (400 V), capacitance (270 µF), lead spacing (0.394" / 10.00mm), diameter (1.378" / 35.00mm), height (1.260" / 32.00mm), and mounting type (Through Hole, Radial Can - Snap-In) are mechanically and electrically compatible. These specifications apply to 277LMB400M2ED, ELXM401VSN271MA30S, and 381LX271M400A022. Upgrade substitutes (450VXH270MEFCSN35X30 and B43642C5277M000) feature 450 V rating and are compatible in 400 V applications, offering design margin.

Q: What is the primary difference between direct equivalents and upgrade substitutes? A: Direct equivalents (ELXM401VSN271MA30S and 381LX271M400A022) maintain the 400 V voltage specification of the main part. The ELXM401VSN271MA30S differentiates through extended 7000 Hrs @ 105°C lifetime. Upgrade substitutes (450VXH270MEFCSN35X30 and B43642C5277M000) feature 450 V rating, increasing voltage margin by 50 V while maintaining capacitance and mechanical compatibility.

Q: How do thermal lifetime ratings affect part selection? A: Thermal lifetime ratings specify operational duration at maximum temperature (105°C). The main part and 381LX271M400A022 provide 3000 Hrs @ 105°C. The ELXM401VSN271MA30S extends this to 7000 Hrs @ 105°C. The 450VXH270MEFCSN35X30 provides 5000 Hrs @ 105°C. Select based on application lifespan requirements and thermal environment.

Q: Are all substitute parts RoHS and REACH compliant? A: All substitute parts carry compliance certifications. The 277LMB400M2ED, 450VXH270MEFCSN35X30, B43642C5277M000, and 381LX271M400A022 are ROHS3 Compliant. The ELXM401VSN271MA30S is RoHS Compliant. All listed parts are REACH Unaffected.

Q: Do substitute parts support the same ripple current specifications? A: Ripple current ratings vary among substitutes. The 277LMB400M2ED supports 1.27 A @ 120 Hz and 1.867 A @ 10 kHz. The ELXM401VSN271MA30S provides 1.31 A @ 120 Hz and 1.8733 A @ 50 kHz. The 450VXH270MEFCSN35X30 offers 1.48 A @ 120 Hz and 2.072 A @ 10 kHz. The B43642C5277M000 supports 1.63 A @ 100 Hz. The 381LX271M400A022 provides 1.2 A @ 120 Hz and 1.7 A @ 20 kHz. Select based on application ripple current demands.

Q: Can the 450 V rated substitutes be used in place of 400 V specifications? A: Yes. Capacitors with higher voltage ratings (450 V) are functionally compatible in circuits designed for 400 V operation, providing additional voltage safety margin. Physical dimensions, lead spacing, and mounting type match the original 277LMB400M2ED specification (1.378" Dia, 1.260" height, 0.394" lead spacing, Through Hole Radial Can - Snap-In).