Equivalent & Substitute Parts for LGN2G151MELY40

Part Overview

The LGN2G151MELY40 is a 150 µF, 400 V aluminum electrolytic capacitor manufactured by Nichicon in the LGN series. This radial, can-style snap-in capacitor is rated for 3000 hours at 105°C and is designed for general-purpose applications requiring high-voltage energy storage and filtering. The part is active in production and ROHS3 compliant. Equivalent and substitute parts are identified to support procurement flexibility, inventory management, and design optimization across compatible electrical and mechanical specifications.

Key Parameters

Parameter	Value
Capacitance	150 µF
Voltage - Rated	400 V
Tolerance	±20%
Lifetime @ Temperature	3000 Hrs @ 105°C
Operating Temperature Range	-25°C ~ 105°C
Package / Case	Radial, Can - Snap-In
Mounting Type	Through Hole
Lead Spacing	0.394" (10.00 mm)
Polarization	Polar
RoHS Status	ROHS3 Compliant

Substitute Part Grouping Explanation

Substitute parts for the LGN2G151MELY40 are classified into three categories based on electrical and mechanical compatibility:

Upgrade Substitutes maintain identical electrical specifications (150 µF, ±20% tolerance, snap-in package, through-hole mounting, 10.00 mm lead spacing) while offering higher voltage ratings or improved performance characteristics. These parts are direct functional upgrades suitable for applications where higher voltage margin is beneficial.

Similar Substitutes match core electrical parameters (150 µF, 400 V, ±20% tolerance, 3000 Hrs @ 105°C, snap-in package, through-hole mounting) but vary in physical dimensions (diameter and height). These parts are mechanically interchangeable only when PCB layout and enclosure constraints permit dimensional variation.

Parametric Equivalents satisfy the primary electrical requirements (150 µF, 400 V, ±20% tolerance, snap-in package, through-hole mounting, 10.00 mm lead spacing) while originating from different manufacturers. These parts are functionally equivalent when manufacturer-specific performance characteristics are acceptable.

Key parameters determining substitution eligibility:

Capacitance: 150 µF (fixed)
Voltage Rating: 400 V minimum
Tolerance: ±20%
Package Type: Radial, Can - Snap-In
Mounting: Through Hole
Lead Spacing: 10.00 mm (for direct PCB compatibility)
Polarization: Polar

Parameter Comparison

Part Number	Manufacturer	Series	Capacitance	Voltage	Tolerance	Lifetime @ 105°C	Diameter	Height	Lead Spacing	RoHS Status
LGN2G151MELY40	Nichicon	LGN	150 µF	400 V	±20%	3000 Hrs	0.787" (20.00 mm)	1.654" (42.00 mm)	0.394" (10.00 mm)	ROHS3
LGNW6151MELY40	Nichicon	LGN	150 µF	420 V	±20%	3000 Hrs	0.787" (20.00 mm)	1.654" (42.00 mm)	0.394" (10.00 mm)	ROHS3
LGU2G151MELA	Nichicon	LGU	150 µF	400 V	±20%	3000 Hrs	0.984" (25.00 mm)	1.181" (30.00 mm)	0.394" (10.00 mm)	ROHS3
LGU2G151MELB	Nichicon	LGU	150 µF	400 V	±20%	3000 Hrs	1.181" (30.00 mm)	0.984" (25.00 mm)	0.394" (10.00 mm)	ROHS3
LGW2G151MELZ35	Nichicon	LGW	150 µF	400 V	±20%	3000 Hrs	0.866" (22.00 mm)	1.378" (35.00 mm)	0.394" (10.00 mm)	ROHS3
EKMQ401VSN151MQ25S	Chemi-Con	KMQ	150 µF	400 V	±20%	2000 Hrs	1.000" (25.40 mm)	1.063" (27.00 mm)	0.394" (10.00 mm)	ROHS3
EKMQ401VSN151MP30S	Chemi-Con	KMQ	150 µF	400 V	±20%	2000 Hrs	0.866" (22.00 mm)	1.260" (32.00 mm)	0.394" (10.00 mm)	ROHS3
400MXG150MEFCSN20X40	Rubycon	MXG	150 µF	400 V	±20%	3000 Hrs	0.787" (20.00 mm)	1.654" (42.00 mm)	0.394" (10.00 mm)	ROHS3

Engineering Selection Recommendations

Direct Replacement (Identical Footprint): The 400MXG150MEFCSN20X40 from Rubycon matches the LGN2G151MELY40 in all physical dimensions (0.787" diameter, 1.654" height, 10.00 mm lead spacing) and electrical specifications (150 µF, 400 V, ±20%, 3000 Hrs @ 105°C). This part is suitable for direct PCB substitution without layout modification. Both parts are ROHS3 compliant and active in production.

Voltage Upgrade: The LGNW6151MELY40 from Nichicon provides identical physical dimensions and package configuration to the LGN2G151MELY40 while offering 420 V rated voltage. This upgrade is applicable in designs where increased voltage margin enhances system reliability. The part maintains 3000-hour lifetime rating and ROHS3 compliance.

Dimensional Variants (Same Electrical Specs): The LGU2G151MELA, LGU2G151MELB, and LGW2G151MELZ35 from Nichicon are electrically equivalent (150 µF, 400 V, ±20%, 3000 Hrs @ 105°C) but feature different physical dimensions. These parts are substitutable only when PCB layout and enclosure space accommodate the dimensional changes. All maintain ROHS3 compliance and through-hole snap-in mounting.

Cross-Manufacturer Alternatives: The EKMQ401VSN151MQ25S and EKMQ401VSN151MP30S from Chemi-Con satisfy core electrical requirements (150 µF, 400 V, ±20%, snap-in package, 10.00 mm lead spacing) but feature reduced lifetime rating (2000 Hrs @ 105°C versus 3000 Hrs). These parts are suitable for applications where the shorter operational life is acceptable. Both are ROHS3 compliant and active in production.

All substitute parts listed are active products with ROHS3 compliance and REACH unaffected status, supporting regulatory requirements for current manufacturing environments.

Frequently Asked Questions (FAQ)

Q: Can I use LGU2G151MELA or LGU2G151MELB as direct replacements for LGN2G151MELY40?

A: These Nichicon parts are electrically equivalent (150 µF, 400 V, ±20%, 3000 Hrs @ 105°C) and share the same 10.00 mm lead spacing. However, they feature different physical dimensions. LGU2G151MELA is 0.984" diameter × 1.181" height, and LGU2G151MELB is 1.181" diameter × 0.984" height, compared to the LGN2G151MELY40 at 0.787" diameter × 1.654" height. Substitution requires verification that your PCB layout and enclosure can accommodate these dimensional changes.

Q: What is the difference between the Nichicon LGN2G151MELY40 and the Rubycon 400MXG150MEFCSN20X40?

A: Both parts are identical in electrical specifications (150 µF, 400 V, ±20%, 3000 Hrs @ 105°C) and physical dimensions (0.787" diameter, 1.654" height, 10.00 mm lead spacing). The primary difference is manufacturer. The Rubycon part is a direct functional equivalent suitable for PCB substitution without layout modification. Both are ROHS3 compliant and active in production.

Q: Why does the EKMQ401VSN151MQ25S have a shorter lifetime rating?

A: The EKMQ401VSN151MQ25S from Chemi-Con is rated for 2000 hours at 105°C, compared to 3000 hours for the LGN2G151MELY40. This reflects different design and manufacturing specifications between manufacturers. The part remains suitable for applications where the reduced operational life meets system requirements. Verify application lifetime requirements before substitution.

Q: Is the LGNW6151MELY40 a direct upgrade?

A: The LGNW6151MELY40 maintains identical physical dimensions and package configuration to the LGN2G151MELY40 while offering 420 V rated voltage (versus 400 V). This represents a voltage margin upgrade suitable for designs where higher voltage headroom is beneficial. The part is ROHS3 compliant and rated for 3000 hours at 105°C, matching the original part's lifetime specification.

Q: Can I substitute parts with different diameters and heights?

A: Substitution of parts with different physical dimensions (such as LGW2G151MELZ35 at 0.866" diameter × 1.378" height) requires verification that your PCB layout accommodates the dimensional change and that enclosure space permits the new form factor. Lead spacing remains constant at 10.00 mm, ensuring electrical connectivity. Confirm mechanical fit before implementation.

Q: Are all listed substitute parts ROHS3 compliant?

A: Yes. All substitute parts listed—including Nichicon LGN, LGU, and LGW series; Chemi-Con KMQ series; and Rubycon MXG series—are ROHS3 compliant and REACH unaffected, supporting current manufacturing and regulatory requirements.

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