LGJ2E121MELZ Equivalent & Substitute Parts

Part Overview

The LGJ2E121MELZ is a 120 µF, 250 V aluminum electrolytic capacitor manufactured by Nichicon in the LGJ series. This radial, can-style snap-in component is designed for general-purpose applications with a rated lifetime of 3000 hours at 105°C. The part is currently listed as obsolete, making equivalent and substitute parts necessary for ongoing system support and new procurement requirements.

Key Parameters

Parameter	Value
Capacitance	120 µF
Voltage Rating	250 V
Tolerance	±20%
Lifetime @ 105°C	3000 Hrs
Operating Temperature Range	-40°C to 105°C
Polarization	Polar
Package Type	Radial, Can - Snap-In
Mounting Type	Through Hole
Lead Spacing	0.394" (10.00 mm)

Substitute Part Grouping Explanation

Substitution for the LGJ2E121MELZ is determined by strict equivalence across the following electrical and mechanical parameters:

Capacitance value: 120 µF (exact match required)
Voltage rating: 250 V (exact match required)
Tolerance: ±20% (exact match required)
Polarization: Polar (exact match required)
Package type: Radial, Can - Snap-In (exact match required)
Mounting type: Through Hole (exact match required)
Lead spacing: 0.394" (10.00 mm) (exact match required)
Operating temperature range: -40°C to 105°C (exact match required)

Two substitute parts meet these criteria. The first is a direct manufacturer variant from Nichicon with reduced lifetime specification. The second is a parametric equivalent from EPCOS - TDK Electronics with identical electrical ratings and physical dimensions.

Parameter Comparison

Parameter	LGJ2E121MELZ (Main)	LGJ2E121MELA15 (Nichicon Variant)	B43254E2127M000 (EPCOS - TDK)
Manufacturer	Nichicon	Nichicon	EPCOS - TDK Electronics
Capacitance	120 µF	120 µF	120 µF
Voltage Rating	250 V	250 V	250 V
Tolerance	±20%	±20%	±20%
Lifetime @ 105°C	3000 Hrs	2000 Hrs	3000 Hrs
Operating Temperature	-40°C to 105°C	-40°C to 105°C	-40°C to 105°C
Polarization	Polar	Polar	Polar
Package Type	Radial, Can - Snap-In	Radial, Can - Snap-In	Radial, Can - Snap-In
Mounting Type	Through Hole	Through Hole	Through Hole
Lead Spacing	0.394" (10.00 mm)	0.394" (10.00 mm)	0.394" (10.00 mm)
Size / Dimension	0.866" Dia (22.00 mm)	0.984" Dia (25.00 mm)	0.866" Dia (22.00 mm)
Height - Seated (Max)	0.866" (22.00 mm)	0.669" (17.00 mm)	0.866" (22.00 mm)
Ripple Current @ 120 Hz	600 mA	600 mA	560 mA
Ripple Current @ High Frequency	900 mA @ 50 kHz	900 mA @ 50 kHz	868 mA @ 20 kHz
Product Status	Obsolete	Active	Not For New Designs
RoHS Status	Not specified	ROHS3 Compliant	ROHS3 Compliant

Engineering Selection Recommendations

LGJ2E121MELA15 (Nichicon): This part is electrically and mechanically equivalent to the LGJ2E121MELZ with one exception: reduced lifetime specification of 2000 hours at 105°C versus 3000 hours. The part carries Active product status and ROHS3 compliance. Physical dimensions differ slightly (0.984" diameter, 0.669" height), requiring verification of PCB layout compatibility. This variant is suitable for applications where the reduced lifetime specification does not impact system requirements.

B43254E2127M000 (EPCOS - TDK Electronics): This part matches the LGJ2E121MELZ in electrical specifications and physical dimensions (0.866" diameter, 0.866" height). Lifetime specification is identical at 3000 hours at 105°C. The part carries ROHS3 compliance and MSL rating of 1 (Unlimited). Product status is listed as Not For New Designs. Ripple current specifications are marginally lower (560 mA @ 120 Hz, 868 mA @ 20 kHz). This part is suitable for replacement applications where the original part is no longer available.

Frequently Asked Questions (FAQ)

Q: Can LGJ2E121MELA15 be used as a direct replacement for LGJ2E121MELZ?

A: LGJ2E121MELA15 is electrically equivalent but has a reduced lifetime specification (2000 hours versus 3000 hours at 105°C). Physical dimensions also differ. Substitution is valid only if the application does not require the full 3000-hour lifetime and if PCB layout accommodates the larger diameter (0.984" versus 0.866").

Q: What are the physical dimension differences between the substitute parts?

A: The LGJ2E121MELZ and B43254E2127M000 share identical dimensions (0.866" diameter, 0.866" height). The LGJ2E121MELA15 has a larger diameter (0.984") and shorter height (0.669"), requiring PCB layout verification before substitution.

Q: Are all substitute parts RoHS compliant?

A: LGJ2E121MELA15 and B43254E2127M000 are both ROHS3 compliant. The original LGJ2E121MELZ does not specify RoHS status in the provided data.

Q: What is the significance of the "Not For New Designs" status on B43254E2127M000?

A: This designation indicates the part is available for replacement and support of existing systems but is not recommended for new product development. The part remains functionally suitable for equivalent substitution in established applications.

Q: How do ripple current specifications compare?

A: The LGJ2E121MELZ and LGJ2E121MELA15 specify 600 mA @ 120 Hz and 900 mA @ 50 kHz. The B43254E2127M000 specifies 560 mA @ 120 Hz and 868 mA @ 20 kHz. These differences are within acceptable tolerance for general-purpose applications but should be verified for high-ripple-current environments.

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