187LMX400M2EC Equivalent & Substitute Parts Reference

Part Overview

The 187LMX400M2EC is a 180 µF, 400 V aluminum electrolytic capacitor manufactured by Cornell Dubilier / Illinois Capacitor in the LMX series. This radial, can-style snap-in capacitor is designed for general-purpose applications requiring through-hole mounting with a 10.00 mm lead spacing and 35.00 mm diameter form factor. The component maintains active product status with 675 units currently in stock. Substitute parts are identified when equivalent electrical and mechanical parameters are required due to inventory constraints, application-specific performance needs, or design optimization within the allowed parameter ranges.

Key Parameters

Parameter	Value	Unit
Capacitance	180	µF
Voltage - Rated	400	V
Tolerance	±20%	-
Operating Temperature Range	-25°C to 105°C	-
Lifetime @ 105°C	5000	Hrs
ESR @ 120 Hz	1.8421	Ohm
Ripple Current @ 120 Hz	1.01	A
Ripple Current @ 50 kHz	1.485	A
Lead Spacing	10.00	mm
Diameter	35.00	mm
Height - Seated (Max)	27.00	mm
Package Type	Radial, Can - Snap-In	-
Mounting Type	Through Hole	-
RoHS Status	ROHS3 Compliant	-

Substitute Part Grouping Explanation

Substitute parts for the 187LMX400M2EC are qualified based on the following critical parameters that must remain constant or within acceptable ranges:

Fixed Parameters (Must Match Exactly):

Capacitance: 180 µF
Tolerance: ±20%
Lead Spacing: 10.00 mm
Diameter: 35.00 mm
Height - Seated (Max): 27.00 mm
Package Type: Radial, Can - Snap-In
Mounting Type: Through Hole
Operating Temperature Range: -25°C to 105°C
Polarization: Polar
RoHS Status: ROHS3 Compliant

Variable Parameters (Allowed Substitution Range):

Voltage - Rated: 400 V or higher (substitutes at 450 V are acceptable as they provide superior voltage margin)
Lifetime @ 105°C: 5000 Hrs or longer (extended lifetime is acceptable)
ESR: Lower values are acceptable (improved performance)
Ripple Current: Equal or higher values are acceptable (improved thermal performance)

Two substitute parts meet these criteria: LGR2G181MELC25 (Nichicon LGR series) and LGX2W181MELC25 (Nichicon LGX series).

Parameter Comparison

Parameter	187LMX400M2EC (Main)	LGR2G181MELC25 (Substitute)	LGX2W181MELC25 (Substitute)
Manufacturer	Cornell Dubilier / Illinois Capacitor	Nichicon	Nichicon
Series	LMX	LGR	LGX
Capacitance	180 µF	180 µF	180 µF
Tolerance	±20%	±20%	±20%
Voltage - Rated	400 V	400 V	450 V
Lifetime @ 105°C	5000 Hrs	10000 Hrs	5000 Hrs
Operating Temperature	-25°C to 105°C	-25°C to 105°C	-25°C to 105°C
Ripple Current @ 120 Hz	1.01 A	0.9 A	1.1 A
Ripple Current @ 50 kHz	1.485 A	1.287 A	1.573 A
Lead Spacing	10.00 mm	10.00 mm	10.00 mm
Diameter	35.00 mm	35.00 mm	35.00 mm
Height - Seated (Max)	27.00 mm	27.00 mm	27.00 mm
Package Type	Radial, Can - Snap-In	Radial, Can - Snap-In	Radial, Can - Snap-In
Mounting Type	Through Hole	Through Hole	Through Hole
RoHS Status	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant
Inventory	675 Pcs	1028 Pcs	1325 Pcs

Engineering Selection Recommendations

LGR2G181MELC25 Selection Criteria: This Nichicon LGR series substitute maintains the 400 V voltage rating of the original 187LMX400M2EC while providing doubled lifetime performance (10000 Hrs @ 105°C versus 5000 Hrs). The lower ripple current ratings at both 120 Hz (0.9 A) and 50 kHz (1.287 A) indicate this part operates with reduced thermal stress. This substitute is appropriate for applications where the original ripple current specifications are not exceeded and extended operational life is beneficial. RoHS3 compliance and REACH unaffected status are maintained.

LGX2W181MELC25 Selection Criteria: This Nichicon LGX series substitute provides a 450 V voltage rating, exceeding the original 400 V specification by 50 V. This elevated voltage rating provides additional design margin for applications subject to voltage transients or overvoltage conditions. Ripple current performance at 50 kHz (1.573 A) exceeds the original specification, supporting higher thermal loads. Lifetime remains at 5000 Hrs @ 105°C, matching the original part. RoHS3 compliance and REACH unaffected status are maintained.

Both substitutes maintain identical mechanical form factors, lead spacing, and through-hole mounting compatibility with the original 187LMX400M2EC, ensuring direct board-level compatibility without layout modifications.

Frequently Asked Questions (FAQ)

Q: Can LGR2G181MELC25 be used as a direct replacement for 187LMX400M2EC?

A: Yes. The LGR2G181MELC25 maintains identical capacitance (180 µF), tolerance (±20%), voltage rating (400 V), operating temperature range (-25°C to 105°C), and mechanical dimensions (35.00 mm diameter, 27.00 mm height, 10.00 mm lead spacing). The radial, can-style snap-in package and through-hole mounting are identical. The extended lifetime (10000 Hrs @ 105°C) represents an improvement over the original 5000 Hrs specification.

Q: Can LGX2W181MELC25 be used as a direct replacement for 187LMX400M2EC?

A: Yes. The LGX2W181MELC25 maintains identical capacitance (180 µF), tolerance (±20%), operating temperature range (-25°C to 105°C), and mechanical dimensions (35.00 mm diameter, 27.00 mm height, 10.00 mm lead spacing). The voltage rating is elevated to 450 V, which is acceptable as it provides superior voltage margin. The radial, can-style snap-in package and through-hole mounting are identical.

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

A: LGR2G181MELC25 maintains the 400 V voltage rating with doubled lifetime (10000 Hrs @ 105°C). LGX2W181MELC25 provides an elevated 450 V voltage rating with standard 5000 Hrs @ 105°C lifetime. Selection depends on whether extended lifetime or higher voltage margin is prioritized for the application.

Q: Are the mechanical dimensions identical across all three parts?

A: Yes. All three parts share identical lead spacing (10.00 mm), diameter (35.00 mm), and maximum seated height (27.00 mm). The radial, can-style snap-in package and through-hole mounting configuration are identical, ensuring direct board-level compatibility without PCB layout modifications.

Q: Do the substitute parts meet the same compliance standards?

A: Yes. Both LGR2G181MELC25 and LGX2W181MELC25 are ROHS3 compliant and REACH unaffected, matching the compliance status of the original 187LMX400M2EC.

Q: What is the significance of the ripple current differences?

A: Ripple current ratings indicate the maximum AC current the capacitor can safely handle at specified frequencies without exceeding temperature limits. LGR2G181MELC25 has lower ripple current ratings (0.9 A @ 120 Hz, 1.287 A @ 50 kHz), indicating reduced thermal stress at these frequencies. LGX2W181MELC25 has higher ripple current ratings (1.1 A @ 120 Hz, 1.573 A @ 50 kHz), supporting higher thermal loads. Selection depends on the actual ripple current requirements of the application.

Q: Can these parts be used interchangeably in the same circuit?

A: Yes, within the constraints of the application's ripple current and voltage requirements. If the application requires ripple current handling at or above 1.01 A @ 120 Hz or 1.485 A @ 50 kHz, LGX2W181MELC25 is the appropriate choice. If ripple current requirements are below these thresholds, either substitute is acceptable. If voltage transient protection is required, LGX2W181MELC25 provides superior margin with its 450 V rating.

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