ECO-S2WB121DA Equivalent & Substitute Parts

Part Overview

The ECO-S2WB121DA is a 120 µF, 450 V aluminum electrolytic capacitor manufactured by Panasonic Electronic Components in the TS-HB 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 obsolete, making equivalent substitutes necessary for ongoing system maintenance and new designs requiring compatible performance characteristics.

Substiute Parts

ECO-S2WB121DA

Panasonic Electronic ComponentsIn Stock: 902ECO-S2WB121DA Datasheet

Current PartRFQ

LGU2W121MELB

NichiconIn Stock: 999LGU2W121MELB Datasheet

DirectRFQ

381LQ121M450H032

Cornell Dubilier Electronics (CDE)In Stock: 989381LQ121M450H032 Datasheet

SimilarRFQ

381LX121M450J032

Cornell Dubilier Electronics (CDE)In Stock: 992381LX121M450J032 Datasheet

SimilarRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution eligibility for the ECO-S2WB121DA is determined by strict adherence to the following parameters:

Critical Parameters (Must Match Exactly):

• Capacitance: 120 µF
• Voltage Rating: 450 V
• Tolerance: ±20%
• Package Type: Radial, Can - Snap-In
• Mounting Type: Through Hole
• Lead Spacing: 0.394" (10.00mm)
• Polarization: Polar
• Operating Temperature Range: -25°C ~ 105°C

Allowable Variations:

• Lifetime @ Temperature: May differ from 3000 Hrs @ 105°C
• ESR (Equivalent Series Resistance): May differ
• Ripple Current ratings: May differ
• Physical dimensions (diameter and height): May vary within mechanical compatibility constraints
• Product status: Active or obsolete
• Manufacturer: Any qualified manufacturer

Substitute parts must maintain identical electrical specifications (capacitance, voltage, tolerance) and compatible mechanical form factors to ensure direct replacement capability in existing PCB layouts and mechanical assemblies.

Parameter Comparison

Engineering Selection Recommendations

LGU2W121MELB (Nichicon) is the primary direct substitute. This part maintains identical capacitance, voltage rating, tolerance, lead spacing, and physical dimensions (1.181" diameter, 0.984" height) as the ECO-S2WB121DA. The LGU2W121MELB is active in production, ROHS3 compliant, and rated for 3000 hours at 105°C, matching the original part's thermal endurance specification.

381LX121M450J032 (Cornell Dubilier Electronics) is a secondary substitute. While electrically equivalent in all critical parameters, this part has different physical dimensions (0.984" diameter, 1.457" height). This substitute is suitable only if PCB layout and mechanical clearance accommodate the increased height. The part is active in production and ROHS3 compliant with 3000-hour lifetime at 105°C.

381LQ121M450H032 (Cornell Dubilier Electronics) is a tertiary substitute with significant dimensional differences (0.866" diameter, 1.457" height) and reduced thermal lifetime (2000 hours at 105°C versus 3000 hours). This part is suitable only for applications where the reduced lifetime is acceptable and mechanical space permits the taller profile.

All three substitutes are ROHS3 compliant and suitable for general-purpose applications within the specified operating temperature range.

Frequently Asked Questions (FAQ)

Q: Can I use 381LQ121M450H032 or 381LX121M450J032 as direct drop-in replacements for ECO-S2WB121DA?

A: Both parts are electrically equivalent but have different physical dimensions. The 381LQ121M450H032 and 381LX121M450J032 are taller (1.457" versus 0.984") and may not fit existing PCB layouts without mechanical modification. Verify available vertical clearance before selection.

Q: What is the primary difference between LGU2W121MELB and the original ECO-S2WB121DA?

A: The LGU2W121MELB is electrically and mechanically identical to the ECO-S2WB121DA. The primary difference is manufacturer (Nichicon versus Panasonic) and product status (active versus obsolete). Both maintain the same 120 µF capacitance, 450 V rating, and physical form factor.

Q: Does the ESR difference between substitutes affect circuit performance?

A: ESR values are provided only for ECO-S2WB121DA (1.382 Ohm @ 120Hz) and 381LQ121M450H032 (1.52 Ohm @ 120Hz). The 1.38 percent difference is within typical manufacturing tolerance and does not constitute a functional limitation for general-purpose applications. ESR specifications for LGU2W121MELB and 381LX121M450J032 are not provided.

Q: Are all substitutes RoHS compliant?

A: Yes. LGU2W121MELB, 381LQ121M450H032, and 381LX121M450J032 are all ROHS3 compliant. The original ECO-S2WB121DA RoHS status is not specified.

Q: What is the significance of the 3000-hour versus 2000-hour lifetime rating?

A: Lifetime rating indicates expected operational duration at maximum rated temperature (105°C). The 381LQ121M450H032 is rated for 2000 hours at 105°C, while ECO-S2WB121DA, LGU2W121MELB, and 381LX121M450J032 are rated for 3000 hours. For applications requiring extended service life at elevated temperatures, select parts with 3000-hour ratings.

Q: Can I use these substitutes in new designs?

A: Yes. LGU2W121MELB, 381LQ121M450H032, and 381LX121M450J032 are all active in production and suitable for new designs. Verify mechanical fit and thermal lifetime requirements for your specific application.