Equivalent & Substitute Parts for LLS2W181MELZ

Part Overview

The LLS2W181MELZ is a 180 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 887 units in stock. Substitute parts are identified when equivalent electrical specifications and mechanical compatibility allow direct replacement in circuit designs, particularly when primary inventory is unavailable or when alternative manufacturers offer improved availability or performance characteristics.

Substiute Parts

LLS2W181MELZ

NichiconIn Stock: 907LLS2W181MELZ Datasheet

Current PartRFQ

LLS2W181MELA

NichiconIn Stock: 1169LLS2W181MELA Datasheet

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ESMQ451VSN181MQ30S

Chemi-ConIn Stock: 1401ESMQ451VSN181MQ30S Datasheet

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Key Parameters

Substitute Part Grouping Explanation

Substitution eligibility for the LLS2W181MELZ is determined by the following critical parameters:

• Capacitance: Must be 180 µF (±20% tolerance acceptable)
• Voltage Rating: Must be 450 V or higher
• Polarization: Must be polar (electrolytic)
• Mounting Type: Must be through-hole
• Package Style: Must be radial, can-style snap-in
• Lead Spacing: Must be 0.394" (10.00 mm)
• Operating Temperature: Must support -25°C to 85°C range

Parts meeting all these criteria are classified as direct substitutes. Secondary considerations include ripple current ratings, physical dimensions, and thermal lifetime specifications, which may affect performance in specific applications but do not preclude substitution when primary parameters align.

Parameter Comparison

Engineering Selection Recommendations

LLS2W181MELA (Nichicon): This part is a direct substitute for the LLS2W181MELZ. Both are manufactured by Nichicon within the LLS series and share identical electrical specifications (180 µF, 450 V, ±20% tolerance, 3000 Hrs @ 85°C). The primary difference is physical dimension: the LLS2W181MELA has a larger diameter (0.984" vs. 0.866") and shorter height (1.378" vs. 1.772"). This part is suitable for applications where PCB space constraints are less critical and higher ripple current capability (2.002 A @ 50 kHz) is beneficial. Both parts are ROHS3 compliant and maintain identical lead spacing (10.00 mm).

ESMQ451VSN181MQ30S (Chemi-Con): This part meets all primary substitution criteria and is manufactured by Chemi-Con in the SMQ series. Electrical specifications match the main part (180 µF, 450 V, ±20% tolerance, -25°C to 85°C operating range). The thermal lifetime specification is lower at 2000 Hrs @ 85°C compared to 3000 Hrs for the Nichicon parts. Physical dimensions are the most compact (1.000" diameter, 1.181" height). This part is RoHS compliant and suitable for applications where space optimization is prioritized and the reduced thermal lifetime does not conflict with design requirements. Lead spacing remains compatible at 10.00 mm.

All three parts are active products with confirmed inventory availability and meet international compliance standards (RoHS, REACH, EAR99).

Frequently Asked Questions (FAQ)

Q: Can LLS2W181MELA be used as a direct replacement for LLS2W181MELZ?

A: Yes. Both parts share identical electrical specifications (180 µF, 450 V, ±20% tolerance, 3000 Hrs @ 85°C) and mechanical compatibility (through-hole, radial snap-in, 10.00 mm lead spacing). The primary difference is physical size. Verify that the larger diameter (0.984" vs. 0.866") and different height (1.378" vs. 1.772") fit within your PCB layout constraints.

Q: What is the key difference between the Nichicon LLS series and Chemi-Con SMQ series parts?

A: The primary difference is thermal lifetime: Nichicon LLS parts are rated for 3000 Hrs @ 85°C, while the Chemi-Con SMQ part is rated for 2000 Hrs @ 85°C. All other electrical parameters (capacitance, voltage, tolerance, temperature range) are identical. Physical dimensions also differ, with the SMQ part being the most compact. Select based on thermal lifetime requirements and available PCB space.

Q: Are all three parts mechanically compatible with the same PCB footprint?

A: Lead spacing is identical (10.00 mm) for all three parts, ensuring PCB hole compatibility. However, physical dimensions differ significantly. The LLS2W181MELZ (22.00 mm diameter, 45.00 mm height) is the largest, while the ESMQ451VSN181MQ30S (25.40 mm diameter, 30.00 mm height) is the most compact. Verify that component clearance and height constraints are satisfied before substitution.

Q: Do all substitute parts meet the same compliance standards?

A: Nichicon parts (LLS2W181MELZ and LLS2W181MELA) are ROHS3 compliant. The Chemi-Con part (ESMQ451VSN181MQ30S) is RoHS compliant. All three parts are REACH unaffected and classified as EAR99. Verify compliance requirements for your specific application or region before final selection.

Q: Which substitute part offers the best ripple current performance?

A: The LLS2W181MELA offers the highest ripple current ratings at 1.4 A @ 120 Hz and 2.002 A @ 50 kHz. The ESMQ451VSN181MQ30S provides 1.35 A @ 120 Hz and 1.931 A @ 50 kHz. The original LLS2W181MELZ provides 1.32 A @ 120 Hz and 1.8876 A @ 50 kHz. Select based on your circuit's ripple current requirements.