LLS2W121MELY Equivalent & Substitute Parts

Part Overview

The LLS2W121MELY is a 120 µF, 450 V aluminum electrolytic capacitor manufactured by Nichicon in the LLS series. This radial, can-style snap-in capacitor is designed for general-purpose applications requiring high voltage energy storage and filtering. The part is currently active in production with 929 units in stock. Equivalent and substitute parts are identified when design requirements necessitate alternative sourcing, inventory constraints, or specific performance characteristics aligned with the original specifications.

Key Parameters

Parameter	Value
Capacitance	120 µF
Voltage Rating	450 V
Tolerance	±20%
Package Type	Radial, Can - Snap-In
Mounting Type	Through Hole
Lead Spacing	0.394" (10.00 mm)
Operating Temperature Range	-25°C ~ 85°C
Polarization	Polar
RoHS Status	ROHS3 Compliant

Substitute Part Grouping Explanation

Substitution eligibility for the LLS2W121MELY is determined by strict alignment with the following electrical and mechanical parameters:

Capacitance Value: 120 µF (exact match required)
Voltage Rating: 450 V (exact match required)
Tolerance: ±20% (exact match required)
Package Configuration: 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: -25°C ~ 85°C (minimum requirement)
Polarization: Polar (exact match required)

The two identified substitute parts meet all mandatory electrical and mechanical criteria. Physical dimensions (diameter and height) may vary within acceptable tolerances for snap-in mounting compatibility. Lifetime ratings and ripple current specifications differ but remain within acceptable operational parameters for general-purpose applications.

Parameter Comparison

Parameter	LLS2W121MELY (Nichicon)	380LQ121M450H022 (CDE)	ESMQ451VSN121MP30S (Chemi-Con)
Capacitance	120 µF	120 µF	120 µF
Voltage Rating	450 V	450 V	450 V
Tolerance	±20%	±20%	±20%
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)
Operating Temperature Range	-25°C ~ 85°C	-25°C ~ 85°C	-25°C ~ 85°C
Polarization	Polar	Polar	Polar
Lifetime @ 85°C	3000 Hrs	2000 Hrs	2000 Hrs
Ripple Current @ 120 Hz	990 mA	1.04 A	1.04 A
Ripple Current @ High Frequency	1.4157 A @ 50 kHz	1.46 A @ 20 kHz	1.487 A @ 50 kHz
RoHS Status	ROHS3 Compliant	ROHS3 Compliant	RoHS Compliant
REACH Status	REACH Unaffected	REACH Unaffected	REACH Unaffected
Product Status	Active	Active	Active

Engineering Selection Recommendations

All three parts—LLS2W121MELY, 380LQ121M450H022, and ESMQ451VSN121MP30S—are active production components with full regulatory compliance. Selection between these parts is based on availability and application-specific performance requirements:

LLS2W121MELY (Nichicon): Primary choice offering the highest lifetime rating of 3000 hours at 85°C, suitable for applications requiring extended operational life. ROHS3 compliant.

380LQ121M450H022 (Cornell Dubilier Electronics): Alternative with 2000-hour lifetime rating and documented ESR specification of 1.656 Ohm @ 120 Hz. ROHS3 compliant. Slightly larger physical dimensions (0.866" diameter, 1.260" height) require verification of board layout compatibility.

ESMQ451VSN121MP30S (Chemi-Con): Alternative with 2000-hour lifetime rating and compact physical dimensions (0.866" diameter, 1.181" height). RoHS compliant. Moisture sensitivity level rated as Not Applicable.

All parts maintain identical electrical specifications (120 µF, 450 V, ±20% tolerance) and mechanical compatibility (10.00 mm lead spacing, through-hole mounting, snap-in package).

Frequently Asked Questions (FAQ)

Q: Can LLS2W121MELY be directly replaced with 380LQ121M450H022 or ESMQ451VSN121MP30S?

A: Yes. All three parts share identical capacitance (120 µF), voltage rating (450 V), tolerance (±20%), lead spacing (10.00 mm), and mounting type (through-hole, snap-in). Physical dimensions vary slightly; verify board layout clearance before substitution.

Q: What are the key differences between these substitute parts?

A: The primary differences are lifetime rating (LLS2W121MELY: 3000 Hrs vs. alternatives: 2000 Hrs @ 85°C), physical dimensions, and ESR specifications. Ripple current ratings are comparable across all parts.

Q: Are all parts RoHS compliant?

A: LLS2W121MELY and 380LQ121M450H022 are ROHS3 compliant. ESMQ451VSN121MP30S is RoHS compliant. All are REACH unaffected.

Q: Does lead spacing differ between these parts?

A: No. All three parts maintain 0.394" (10.00 mm) lead spacing, ensuring PCB footprint compatibility.

Q: What is the operating temperature range for all parts?

A: All parts operate within -25°C to 85°C, with lifetime specifications rated at 85°C.

Q: Are there physical dimension constraints I should consider?

A: LLS2W121MELY has a diameter of 0.787" and height of 1.575". The two substitute parts have larger diameters (0.866") but varying heights (1.260" for CDE, 1.181" for Chemi-Con). Verify available board space before selection.

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