LGU2G151MELY Equivalent & Substitute Parts

Part Overview

The LGU2G151MELY is a 150 µF, 400 V aluminum electrolytic capacitor manufactured by Nichicon in the LGU series. This radial, can-style snap-in capacitor is rated for 3000 hours at 105°C and is designed for general-purpose applications requiring stable capacitance and ripple current handling in through-hole configurations. The part is active and ROHS3 compliant.

Equivalent and substitute parts are identified when designs require alternative sourcing due to inventory constraints, manufacturing discontinuation, or when design specifications permit voltage or dimensional variations within acceptable operating parameters.

Key Parameters

Parameter	Value	Unit
Capacitance	150	µF
Voltage - Rated	400	V
Tolerance	±20%	-
Lifetime @ Temperature	3000 Hrs @ 105°C	-
Operating Temperature Range	-25°C ~ 105°C	-
Ripple Current @ 120 Hz	830	mA
Ripple Current @ 50 kHz	1.1869	A
Lead Spacing	10.00	mm
Size / Dimension	20.00 Dia	mm
Height - Seated (Max)	45.00	mm
Mounting Type	Through Hole	-
Package / Case	Radial, Can - Snap-In	-
RoHS Status	ROHS3 Compliant	-

Substitute Part Grouping Explanation

Substitute parts for the LGU2G151MELY are classified into two categories based on electrical and mechanical compatibility:

Upgrade Substitutes are parts with enhanced electrical specifications that maintain or exceed the original part's performance envelope:

Voltage rating increased to 420 V (higher voltage rating provides additional safety margin)
Identical capacitance (150 µF) and tolerance (±20%)
Identical operating temperature range (-25°C ~ 105°C)
Identical lifetime rating (3000 Hrs @ 105°C)
Identical lead spacing (10.00 mm) and mounting type (Through Hole, Radial, Can - Snap-In)
Dimensional variations permitted within PCB layout constraints

Equivalent Substitutes are parts with identical electrical specifications but different physical dimensions or from alternative manufacturers:

Identical capacitance (150 µF), voltage (400 V), and tolerance (±20%)
Identical operating temperature range (-25°C ~ 105°C)
Identical lead spacing (10.00 mm) and mounting type (Through Hole, Radial, Can - Snap-In)
Variations in lifetime rating (2000 Hrs vs. 3000 Hrs @ 105°C) or physical dimensions permitted based on PCB layout availability
Manufacturer alternatives from Nichicon (LGU, LGW series) and Chemi-Con (KMQ series)

Parameter Comparison

Part Number	Manufacturer	Series	Capacitance (µF)	Voltage (V)	Tolerance	Lifetime @ 105°C	Ripple Current @ 120 Hz (mA)	Ripple Current @ 50 kHz (A)	Size Dia (mm)	Height (mm)	Status
LGU2G151MELY	Nichicon	LGU	150	400	±20%	3000 Hrs	830	1.1869	20.00	45.00	Active
LGNW6151MELY40	Nichicon	LGN	150	420	±20%	3000 Hrs	840	1.2012	20.00	42.00	Active
LGU2G151MELA	Nichicon	LGU	150	400	±20%	3000 Hrs	880	1.2584	25.00	30.00	Active
LGU2G151MELB	Nichicon	LGU	150	400	±20%	3000 Hrs	880	1.2584	30.00	25.00	Active
LGW2G151MELZ35	Nichicon	LGW	150	400	±20%	3000 Hrs	1330	1.9019	22.00	35.00	Active
EKMQ401VSN151MP30S	Chemi-Con	KMQ	150	400	±20%	2000 Hrs	880	1.2584	22.00	32.00	Active
EKMQ401VSN151MQ25S	Chemi-Con	KMQ	150	400	±20%	2000 Hrs	880	1.2584	25.40	27.00	Active

Engineering Selection Recommendations

Primary Equivalent (Direct Replacement): LGU2G151MELA and LGU2G151MELB are direct electrical equivalents from Nichicon's LGU series with identical voltage, capacitance, tolerance, and lifetime ratings. Selection between these and the main part depends on PCB layout constraints, as dimensional variations exist (diameter and height differ). Both are ROHS3 compliant and active products.

Upgrade Substitute (Enhanced Voltage Rating): LGNW6151MELY40 provides a 420 V rated voltage compared to the original 400 V specification, maintaining identical capacitance and lifetime performance. This part is suitable when higher voltage margin is required and PCB layout accommodates the 42 mm height (3 mm shorter than the main part). ROHS3 compliant and active.

Alternative Manufacturer (Chemi-Con KMQ Series): EKMQ401VSN151MP30S and EKMQ401VSN151MQ25S are Chemi-Con equivalents with identical electrical specifications (150 µF, 400 V, ±20% tolerance). These parts have a reduced lifetime rating of 2000 Hrs @ 105°C compared to 3000 Hrs for Nichicon parts. Selection is appropriate when application duty cycle permits shorter lifetime or when Chemi-Con sourcing is preferred. Both are ROHS3 compliant and active products.

Higher Ripple Current Capability: LGW2G151MELZ35 from Nichicon's LGW series offers significantly higher ripple current handling (1.33 A @ 120 Hz and 1.9019 A @ 50 kHz) compared to the main part (830 mA @ 120 Hz and 1.1869 A @ 50 kHz). This part is suitable for applications requiring enhanced ripple current performance while maintaining identical voltage, capacitance, and lifetime specifications. ROHS3 compliant and active.

Frequently Asked Questions (FAQ)

Q: Can LGNW6151MELY40 be used as a direct replacement for LGU2G151MELY? A: Yes, LGNW6151MELY40 is electrically compatible as an upgrade substitute. The 420 V rating exceeds the original 400 V specification, and capacitance, tolerance, and lifetime are identical. Verify PCB layout accommodates the 42 mm height (3 mm shorter than the original 45 mm).

Q: What is the difference between Nichicon LGU, LGW, and LGN series substitutes? A: All three series share identical electrical specifications (150 µF, 400 V or 420 V, ±20% tolerance, 3000 Hrs @ 105°C). The LGW series provides higher ripple current capability. The LGN series offers upgraded voltage rating (420 V). Physical dimensions vary across series to accommodate different PCB layouts.

Q: Are Chemi-Con EKMQ parts fully equivalent to Nichicon LGU2G151MELY? A: Chemi-Con EKMQ401VSN151MP30S and EKMQ401VSN151MQ25S are electrically equivalent in capacitance, voltage, and tolerance. The key difference is reduced lifetime rating (2000 Hrs @ 105°C vs. 3000 Hrs). These parts are suitable when application requirements permit shorter operational life or when Chemi-Con sourcing is necessary.

Q: Do all substitute parts maintain the same lead spacing and mounting type? A: Yes. All substitute parts listed maintain 10.00 mm lead spacing and through-hole radial, can-style snap-in mounting. PCB footprints are compatible. Physical diameter and height variations exist and must be verified against PCB layout constraints.

Q: Which substitute offers the best ripple current performance? A: LGW2G151MELZ35 provides the highest ripple current capability at 1.33 A @ 120 Hz and 1.9019 A @ 50 kHz, compared to 830 mA @ 120 Hz and 1.1869 A @ 50 kHz for the main part. This part is recommended for applications with demanding ripple current requirements.

Q: Are all substitute parts ROHS3 compliant? A: Yes. All substitute parts listed are ROHS3 compliant and active products, matching the compliance status of LGU2G151MELY.

Q: What is the primary reason to select a substitute part? A: Substitute selection is driven by inventory availability, PCB layout constraints (dimensional variations), required ripple current performance, desired voltage margin (420 V upgrade option), or manufacturer sourcing preferences. Electrical specifications (capacitance, voltage, tolerance, operating temperature) remain consistent across all listed substitutes.

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