277LMB450M2EE Equivalent & Substitute Parts Reference

Part Overview

The 277LMB450M2EE is a 270 µF, 450 V aluminum electrolytic capacitor manufactured by Cornell Dubilier / Illinois Capacitor in the LMB series. This radial, can-style snap-in capacitor is designed for general-purpose applications requiring high voltage energy storage and filtering. The part is currently active in production with 876 units 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 design requirements necessitate alternative performance characteristics.

Key Parameters

Parameter	Specification
Capacitance	270 µF
Voltage Rating	450 V
Tolerance	±20%
Package Type	Radial, Can - Snap-In
Lead Spacing	0.394" (10.00 mm)
Physical Diameter	1.378" (35.00 mm)
Height (Seated Max)	1.457" (37.00 mm)
Mounting Type	Through Hole
Operating Temperature Range	-25°C to 105°C
Polarization	Polar
RoHS Status	ROHS3 Compliant
MSL Rating	1 (Unlimited)

Substitute Part Grouping Explanation

Substitution eligibility for the 277LMB450M2EE is determined by strict equivalence across the following critical parameters:

Mandatory Matching Parameters:

Capacitance: 270 µF (exact match required)
Voltage Rating: 450 V (exact match required)
Tolerance: ±20% (exact match required)
Package Type: Radial, Can - Snap-In (exact match required)
Lead Spacing: 0.394" (10.00 mm) (exact match required)
Physical Dimensions: 1.378" Dia × 1.457" Height Max (exact match required)
Mounting Type: Through Hole (exact match required)
Operating Temperature Range: -25°C to 105°C (exact match required)
Polarization: Polar (exact match required)

Compliance Parameters:

RoHS Status: ROHS3 Compliant or equivalent
MSL Rating: 1 (Unlimited)
REACH Status: REACH Unaffected

All identified substitute parts meet these mandatory criteria. Performance characteristics such as ESR, ripple current ratings, and lifetime specifications may vary within acceptable ranges for general-purpose applications.

Parameter Comparison

Parameter	277LMB450M2EE (Main)	ETXH451VSN271MA35S (Upgrade)	381LR271M450A032 (Equivalent)	381LX271M450A032 (Equivalent)
Manufacturer	Cornell Dubilier / Illinois Capacitor	Chemi-Con	Cornell Dubilier Electronics (CDE)	Cornell Dubilier Electronics (CDE)
Series	LMB	TXH	381LR	381LX
Capacitance	270 µF	270 µF	270 µF	270 µF
Voltage Rating	450 V	450 V	450 V	450 V
Tolerance	±20%	±20%	±20%	±20%
Lead Spacing	0.394" (10.00 mm)	0.394" (10.00 mm)	0.394" (10.00 mm)	0.394" (10.00 mm)
Diameter	1.378" (35.00 mm)	1.378" (35.00 mm)	1.378" (35.00 mm)	1.378" (35.00 mm)
Height (Seated Max)	1.457" (37.00 mm)	1.457" (37.00 mm)	1.457" (37.00 mm)	1.457" (37.00 mm)
Package Type	Radial, Can - Snap-In	Radial, Can - Snap-In	Radial, Can - Snap-In	Radial, Can - Snap-In
Mounting Type	Through Hole	Through Hole	Through Hole	Through Hole
Operating Temperature	-25°C to 105°C	-25°C to 105°C	-25°C to 105°C	-25°C to 105°C
Polarization	Polar	Polar	Polar	Polar
ESR @ 120 Hz	1.53506 Ohm	Not specified	0.491 Ohm	Not specified
Lifetime @ 105°C	3000 Hrs	10000 Hrs	3000 Hrs	3000 Hrs
Ripple Current @ 120 Hz	1.49 A	1.16 A	1.72 A	1.2 A
Ripple Current @ High Frequency	2.1903 A @ 10 kHz	1.6588 A @ 100 kHz	2.45 A @ 20 kHz	1.7 A @ 20 kHz
RoHS Status	ROHS3 Compliant	RoHS Compliant	ROHS3 Compliant	ROHS3 Compliant
MSL Rating	1 (Unlimited)	1 (Unlimited)	1 (Unlimited)	1 (Unlimited)
Product Status	Active	Active	Active	Active
Current Inventory	876 Pcs	902 Pcs	1642 Pcs	1681 Pcs

Engineering Selection Recommendations

All identified substitute parts are active products with full compliance certifications. Selection between the main part and substitutes is based on the following criteria:

ETXH451VSN271MA35S (Chemi-Con TXH Series): This part offers extended lifetime performance at 10000 hours @ 105°C compared to the 3000-hour rating of the main part. This upgrade is suitable for applications requiring enhanced reliability and extended service life. The part maintains identical mechanical and electrical specifications while providing superior thermal endurance. RoHS compliance is confirmed.

381LR271M450A032 (Cornell Dubilier 381LR Series): This parametric equivalent provides lower ESR (0.491 Ohm @ 120 Hz versus 1.53506 Ohm) and higher ripple current capability (1.72 A @ 120 Hz and 2.45 A @ 20 kHz). This part is suitable for applications with higher ripple current demands or where lower impedance is beneficial. ROHS3 compliance is confirmed with the highest current inventory availability (1642 units).

381LX271M450A032 (Cornell Dubilier 381LX Series): This parametric equivalent maintains the same 3000-hour lifetime as the main part with lower ripple current ratings (1.2 A @ 120 Hz and 1.7 A @ 20 kHz). This part is suitable for general-purpose applications where ripple current requirements are moderate. ROHS3 compliance is confirmed with high inventory availability (1681 units).

All substitute parts are manufactured by established suppliers with active product status and unlimited moisture sensitivity ratings, ensuring compatibility with standard PCB assembly and storage conditions.

Frequently Asked Questions (FAQ)

Q: Can ETXH451VSN271MA35S be used as a direct replacement for 277LMB450M2EE?

A: Yes. ETXH451VSN271MA35S meets all mandatory mechanical and electrical specifications. The part is physically and functionally interchangeable. The primary difference is extended lifetime (10000 hours @ 105°C versus 3000 hours), which represents an upgrade in reliability without any compatibility concerns.

Q: What is the difference between the 381LR271M450A032 and 381LX271M450A032?

A: Both parts are parametric equivalents with identical capacitance, voltage, tolerance, and physical dimensions. The 381LR271M450A032 features lower ESR (0.491 Ohm) and higher ripple current ratings, making it suitable for high-ripple-current applications. The 381LX271M450A032 has lower ripple current specifications and is suitable for standard general-purpose applications. Both share the same 3000-hour lifetime rating.

Q: Are all substitute parts RoHS compliant?

A: Yes. The main part 277LMB450M2EE is ROHS3 compliant. ETXH451VSN271MA35S is RoHS compliant. Both 381LR271M450A032 and 381LX271M450A032 are ROHS3 compliant. All parts meet environmental compliance requirements.

Q: Do the substitute parts have the same physical footprint?

A: Yes. All substitute parts share identical lead spacing (0.394" / 10.00 mm), diameter (1.378" / 35.00 mm), and maximum seated height (1.457" / 37.00 mm). All parts are snap-in radial cans suitable for through-hole PCB mounting without layout modifications.

Q: Which substitute part should be selected for high-ripple-current applications?

A: The 381LR271M450A032 is recommended for high-ripple-current applications. It provides the highest ripple current ratings at both low frequency (1.72 A @ 120 Hz) and high frequency (2.45 A @ 20 kHz), along with the lowest ESR (0.491 Ohm @ 120 Hz).

Q: What is the operating temperature range for all parts?

A: All parts operate across the identical temperature range of -25°C to 105°C. Lifetime specifications are rated at the maximum operating temperature of 105°C.

Q: Are all parts available in bulk packaging?

A: Yes. All parts are supplied in bulk packaging. Current inventory levels are: 277LMB450M2EE (876 units), ETXH451VSN271MA35S (902 units), 381LR271M450A032 (1642 units), and 381LX271M450A032 (1681 units).

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