ECE-S2WP331EX Equivalent & Substitute Parts

Part Overview

The Panasonic ECE-S2WP331EX is a 330 µF, 450 V aluminum electrolytic capacitor in radial, can snap-in configuration. This part is classified as obsolete, making equivalent and substitute parts necessary for ongoing design support and procurement. The ECE-S2WP331EX serves general-purpose applications requiring high-voltage energy storage with specified ripple current handling at both low and high frequencies.

Key Parameters

Parameter	Value
Capacitance	330 µF
Tolerance	±20%
Voltage - Rated	450 V
ESR (Equivalent Series Resistance)	553 mOhm @ 120 Hz
Lifetime @ Temperature	3000 Hrs @ 85°C
Operating Temperature Range	-25°C ~ 85°C
Lead Spacing	0.394" (10.00 mm)
Size / Dimension	1.378" Dia (35.00 mm)
Height - Seated (Max)	1.378" (35.00 mm)
Mounting Type	Through Hole
Package / Case	Radial, Can - Snap-In
Polarization	Polar
Applications	General Purpose

Substitute Part Grouping Explanation

Substitution eligibility for the ECE-S2WP331EX is determined by strict adherence to the following parameters:

Capacitance: 330 µF (exact match required)
Tolerance: ±20% (exact match required)
Voltage - Rated: 450 V (exact match required)
Lifetime @ Temperature: 3000 Hrs @ 85°C (minimum requirement)
Operating Temperature Range: -25°C ~ 85°C (minimum requirement)
Lead Spacing: 0.394" (10.00 mm) (exact match required)
Size / Dimension: 1.378" Dia (35.00 mm) (exact match required)
Mounting Type: Through Hole (exact match required)
Package / Case: Radial, Can - Snap-In (exact match required)
Polarization: Polar (exact match required)

Substitute parts are grouped by their relationship to the main part: direct equivalents share all critical parameters, upgrades offer enhanced performance characteristics, and parametric equivalents meet all functional requirements with minor variations in secondary specifications.

Parameter Comparison

Manufacturer Part Number	Manufacturer	Capacitance	Tolerance	Voltage	ESR @ 120 Hz	Lifetime @ 85°C	Operating Temp Range	Height (Max)	Product Status
ECE-S2WP331EX	Panasonic Electronic Components	330 µF	±20%	450 V	553 mOhm	3000 Hrs	-25°C ~ 85°C	1.378" (35.00 mm)	Obsolete
380LX331M450A032	Cornell Dubilier Electronics (CDE)	330 µF	±20%	450 V	553 mOhm	3000 Hrs	-25°C ~ 85°C	1.457" (37.00 mm)	Active
450USG330MEFCSN35X30	Rubycon	330 µF	±20%	450 V	—	3000 Hrs	-25°C ~ 85°C	1.260" (32.00 mm)	Active
LGW2W331MELC35	Nichicon	330 µF	±20%	450 V	—	3000 Hrs @ 105°C	-25°C ~ 105°C	1.378" (35.00 mm)	Active
380LX331M450A042	Cornell Dubilier Electronics (CDE)	330 µF	±20%	450 V	603 mOhm	3000 Hrs	-25°C ~ 85°C	1.654" (42.00 mm)	Active
LLS2W331MELC	Nichicon	330 µF	±20%	450 V	—	3000 Hrs	-25°C ~ 85°C	1.378" (35.00 mm)	Active
SLPX331M450H5P3	Cornell Dubilier Electronics (CDE)	330 µF	±20%	450 V	804 mOhm @ 120 Hz	3000 Hrs	-25°C ~ 85°C	1.378" (35.00 mm)	Active

Engineering Selection Recommendations

Direct Equivalent (Preferred for Pin-Compatible Replacement):

380LX331M450A032 (Cornell Dubilier Electronics): Matches ESR specification (553 mOhm @ 120 Hz) and all critical electrical parameters. Height exceeds original by 0.079" (2.00 mm); verify PCB clearance before substitution. Active product status with ROHS3 compliance.

Direct Equivalent (Compact Form Factor):

450USG330MEFCSN35X30 (Rubycon): Meets all electrical requirements with reduced height (1.260" vs. 1.378"). ESR not specified; verify ripple current performance for application. Highest inventory availability (36,186 pcs). Active product status with ROHS3 compliance.

Upgrade Option (Enhanced Temperature Performance):

LGW2W331MELC35 (Nichicon): Extends operating temperature range to 105°C and lifetime rating to 3000 Hrs @ 105°C. Maintains original height and lead spacing. Highest inventory availability (1,000,300 pcs). Active product status with ROHS3 compliance.

Parametric Equivalent (Identical Footprint):

LLS2W331MELC (Nichicon): Matches original dimensions and operating temperature range. ESR not specified. Active product status with ROHS3 compliance.

Parametric Equivalent (Higher ESR):

SLPX331M450H5P3 (Cornell Dubilier Electronics): ESR of 804 mOhm @ 120 Hz exceeds original specification; suitable only if application tolerates higher impedance. Maintains original height and lead spacing. Active product status with ROHS3 compliance.

Not Recommended for Direct Substitution:

380LX331M450A042 (Cornell Dubilier Electronics): Height of 1.654" (42.00 mm) significantly exceeds original; PCB clearance verification required. ESR of 603 mOhm differs from original specification.

Frequently Asked Questions (FAQ)

Q: Can I use 450USG330MEFCSN35X30 as a direct replacement for ECE-S2WP331EX? A: Yes, from an electrical standpoint. The Rubycon part meets all critical parameters: 330 µF capacitance, ±20% tolerance, 450 V rating, 3000 Hrs @ 85°C lifetime, and identical lead spacing. The reduced height (1.260" vs. 1.378") is advantageous for space-constrained designs but requires verification that the shorter form factor does not affect mechanical stability or thermal management in your application.

Q: What is the difference between the CDE 380LX331M450A032 and 380LX331M450A042? A: Both are Cornell Dubilier 380LX series parts with identical electrical ratings. The primary differences are height (1.457" vs. 1.654") and ESR (553 mOhm vs. 603 mOhm). The 380LX331M450A032 is the closer match to the original ECE-S2WP331EX. The 380LX331M450A042 is suitable only if your application can tolerate higher ESR and has adequate PCB clearance for the taller form factor.

Q: Why does LGW2W331MELC35 show a different lifetime rating? A: The Nichicon LGW2W331MELC35 is rated for 3000 Hrs @ 105°C, compared to the original 3000 Hrs @ 85°C. This represents an upgrade in thermal performance; the part maintains its capacitance and ESR characteristics at higher temperatures. The extended operating temperature range (-25°C ~ 105°C) provides additional design margin for applications subject to elevated ambient conditions.

Q: Are all substitute parts RoHS3 compliant? A: Yes. All active substitute parts listed carry RoHS3 compliance certification. The original ECE-S2WP331EX is classified as REACH Affected; all substitute parts are REACH Unaffected or ROHS3 Compliant, providing regulatory advantage for new designs.

Q: What does ESR (Equivalent Series Resistance) mean for capacitor selection? A: ESR is the internal resistance of the capacitor at a specified frequency (typically 120 Hz or 100 kHz). Lower ESR reduces heat generation under ripple current conditions and improves high-frequency performance. When ESR is not specified in the datasheet, contact the manufacturer for ripple current ratings at your application frequency to ensure adequate performance.

Q: Can I substitute a part with a higher ESR value? A: Only if your application can tolerate increased heat dissipation and voltage ripple. The SLPX331M450H5P3 (804 mOhm @ 120 Hz) has significantly higher ESR than the original (553 mOhm @ 120 Hz). Use this part only after confirming that ripple current and thermal management remain within acceptable limits for your circuit.

Q: What is the significance of lead spacing and height in substitution? A: Lead spacing (0.394" / 10.00 mm) determines PCB hole pattern compatibility; all substitutes maintain this specification. Height varies between parts (1.260" to 1.654") and affects PCB clearance, component density, and thermal airflow. Verify mechanical fit before finalizing substitution, particularly for compact or thermally constrained designs.

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