187LMX400M2CE Equivalent & Substitute Parts Reference

Part Overview

The 187LMX400M2CE 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 stable capacitance and extended operational life at elevated temperatures. The part maintains active product status with 686 units currently in stock.

Substitute parts are identified when equivalent capacitance and tolerance values are maintained while voltage ratings may be upgraded, physical dimensions remain compatible with through-hole snap-in mounting, and operational temperature ranges align with the original specification.

Substiute Parts

187LMX400M2CE

Cornell Dubilier / Illinois CapacitorIn Stock: 781187LMX400M2CE Datasheet

Current PartRFQ

ELXS451VSN181MQ35S

Chemi-ConIn Stock: 3897ELXS451VSN181MQ35S Datasheet

UpgradeRFQ

LGX2W181MELA35

NichiconIn Stock: 1023LGX2W181MELA35 Datasheet

UpgradeRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution of the 187LMX400M2CE is determined by the following criteria:

Primary Equivalence Parameters:

• Capacitance value: 180 µF (exact match required)
• Tolerance: ±20% (exact match required)
• Polarization: Polar (exact match required)
• Mounting type: Through Hole, Radial, Can - Snap-In (exact match required)
• Lead spacing: 0.394" (10.00mm) (exact match required)
• Operating temperature range: -25°C ~ 105°C (exact match required)
• Lifetime rating: 5000 Hrs @ 105°C (exact match required)

Allowable Variation Parameters:

• Voltage rating: May be equal to or greater than 400 V
• Physical dimensions (diameter and height): Minor variations acceptable within snap-in mounting compatibility
• ESR values: Not required to match exactly
• Ripple current ratings: Not required to match exactly

Both identified substitute parts meet all primary equivalence criteria and maintain compatibility with the original 187LMX400M2CE application requirements.

Parameter Comparison

Engineering Selection Recommendations

Both substitute parts are active products with ROHS3 compliance and REACH unaffected status, matching the regulatory posture of the original 187LMX400M2CE.

ELXS451VSN181MQ35S (Chemi-Con LXS Series):

• Voltage rating upgraded to 450 V, providing increased margin above the 400 V requirement
• Ripple current capacity increased at both low frequency (1.06 A @ 120 Hz) and high frequency (1.5158 A @ 50 kHz)
• Physical dimensions show minor increase (1.000" diameter, 1.476" height) within snap-in mounting tolerance
• 3800 units in stock

LGX2W181MELA35 (Nichicon LGX Series):

• Voltage rating upgraded to 450 V, providing increased margin above the 400 V requirement
• Physical dimensions match original specification exactly (0.984" diameter, 1.457" height)
• Ripple current capacity at low frequency (920 mA @ 120 Hz) is comparable to original
• 926 units in stock

Both parts satisfy all mandatory equivalence parameters and maintain full compatibility with applications designed for the 187LMX400M2CE.

Frequently Asked Questions (FAQ)

Q: Can ELXS451VSN181MQ35S and LGX2W181MELA35 be used interchangeably with 187LMX400M2CE?

A: Both substitute parts meet all primary equivalence criteria: identical capacitance (180 µF), tolerance (±20%), polarization (polar), mounting type (through-hole snap-in), lead spacing (10.00mm), operating temperature range (-25°C ~ 105°C), and lifetime rating (5000 Hrs @ 105°C). They are functionally equivalent for applications designed for the original part.

Q: What is the significance of the voltage rating upgrade from 400 V to 450 V?

A: The substitute parts maintain a higher voltage rating than the original specification. This does not affect compatibility; the capacitors will operate correctly in circuits designed for 400 V operation. The higher rating provides additional safety margin in the application.

Q: Are there physical dimension differences that affect mounting?

A: The LGX2W181MELA35 maintains identical dimensions to the original (0.984" diameter, 1.457" height). The ELXS451VSN181MQ35S shows minor increases (1.000" diameter, 1.476" height). Both remain compatible with snap-in mounting designed for the 187LMX400M2CE, as lead spacing (10.00mm) is identical.

Q: Do ESR and ripple current specifications need to match exactly?

A: No. ESR and ripple current values are performance characteristics that may vary between manufacturers while maintaining functional equivalence. The substitute parts provide comparable or superior ripple current handling at both low and high frequencies.

Q: Are all three parts RoHS and REACH compliant?

A: Yes. The 187LMX400M2CE, ELXS451VSN181MQ35S, and LGX2W181MELA35 are all ROHS3 compliant and REACH unaffected, meeting current regulatory requirements.

Q: Which substitute part should be selected if space is constrained?

A: The LGX2W181MELA35 maintains identical physical dimensions to the original 187LMX400M2CE (0.984" diameter, 1.457" height), making it the preferred choice for applications with strict spatial constraints.