ECO-S2WB121BA Equivalent & Substitute Parts

Part Overview

The ECO-S2WB121BA is a 120 µF, 450 V aluminum electrolytic capacitor in radial, can snap-in package manufactured by Panasonic Electronic Components. This part belongs to the TS-HB series and is classified as obsolete. Due to its obsolete status, equivalent and substitute parts from active manufacturers are necessary for ongoing design support, production continuity, and system maintenance. Substitute parts maintain the core electrical specifications while offering improved availability and active product support.

Substiute Parts

ECO-S2WB121BA

Panasonic Electronic ComponentsIn Stock: 950ECO-S2WB121BA Datasheet

Current PartRFQ

381LQ121M450H032

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

DirectRFQ

LGU2W121MELZ

NichiconIn Stock: 1059LGU2W121MELZ Datasheet

DirectRFQ

LGW2W121MELZ35

NichiconIn Stock: 1119LGW2W121MELZ35 Datasheet

DirectRFQ

381LX121M450J032

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

SimilarRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution for the ECO-S2WB121BA is determined by strict adherence to the following electrical and mechanical parameters:

Core Substitution Criteria:

• Capacitance: 120 µF (exact match required)
• Voltage Rating: 450 V (exact match required)
• Tolerance: ±20% (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: -25°C to 105°C (minimum requirement)
• Polarization: Polar (exact match required)

Direct Substitutes meet all core criteria with identical physical footprint and electrical specifications. Similar Substitutes meet all core criteria but may have dimensional variations (can diameter or height) that require mechanical verification in the application.

Parameter Comparison

Engineering Selection Recommendations

Direct Substitutes (Identical Footprint):

• LGU2W121MELZ (Nichicon): Active product status with ROHS3 compliance. Matches all core electrical and mechanical parameters including 1.575" (40.00 mm) height. Lifetime rating of 3000 hours at 105°C matches the original part.

• LGW2W121MELZ35 (Nichicon): Active product status with ROHS3 compliance. Meets all core specifications with reduced height of 1.378" (35.00 mm), suitable for space-constrained applications where vertical clearance permits.

• 381LQ121M450H032 (Cornell Dubilier Electronics): Active product status with ROHS3 compliance. Meets all core specifications with height of 1.457" (37.00 mm). Lifetime rating of 2000 hours at 105°C is lower than the original part.

Similar Substitute (Dimensional Variation):

• 381LX121M450J032 (Cornell Dubilier Electronics): Active product status with ROHS3 compliance. Meets all electrical specifications and operating temperature range. Can diameter is 0.984" (25.00 mm) versus 0.866" (22.00 mm) on the original part. Mechanical verification required to confirm fit within the application's physical constraints.

All substitute parts are from active manufacturers with current product support and regulatory compliance certifications.

Frequently Asked Questions (FAQ)

Q: Can I use LGW2W121MELZ35 if my PCB has limited vertical clearance?

A: Yes. LGW2W121MELZ35 has a seated height of 1.378" (35.00 mm) compared to the original ECO-S2WB121BA at 1.575" (40.00 mm), providing 0.197" (5.00 mm) of additional clearance. All other mechanical and electrical parameters remain compatible.

Q: What is the difference between the Nichicon and Cornell Dubilier options?

A: Both manufacturers offer active products meeting the core specifications. LGU2W121MELZ and LGW2W121MELZ35 (Nichicon) maintain the 0.866" (22.00 mm) can diameter. 381LQ121M450H032 (CDE) also maintains this diameter but has a lower lifetime rating of 2000 hours at 105°C versus 3000 hours for Nichicon parts. 381LX121M450J032 (CDE) has a larger 0.984" (25.00 mm) can diameter and requires mechanical verification.

Q: Why is 381LQ121M450H032 listed as a direct substitute if it has a lower lifetime rating?

A: The part meets all mandatory electrical and mechanical substitution criteria: 120 µF capacitance, 450 V rating, ±20% tolerance, radial snap-in package, 10.00 mm lead spacing, and -25°C to 105°C operating range. The 2000-hour lifetime at 105°C is lower than the original 3000-hour rating but remains a valid substitute. Application-specific thermal stress analysis determines whether this reduced lifetime is acceptable.

Q: Can I substitute 381LX121M450J032 if my application has space constraints?

A: 381LX121M450J032 has a larger can diameter of 0.984" (25.00 mm) compared to 0.866" (22.00 mm) on the original part. This 0.118" (3.00 mm) diameter increase requires verification that the component fits within the available PCB footprint and surrounding component clearances. All electrical specifications and operating parameters remain compatible.

Q: Are all substitute parts RoHS compliant?

A: Yes. All listed substitute parts are ROHS3 compliant. The original ECO-S2WB121BA RoHS status was not specified in the available data.

Q: What is the lead spacing tolerance for these parts?

A: All parts, including the original and all substitutes, have a lead spacing of 0.394" (10.00 mm), ensuring compatibility with existing PCB through-hole patterns.