EKMS421VSN331MA30S Equivalent & Substitute Parts

Part Overview

The EKMS421VSN331MA30S is a 330 µF, 420 V aluminum electrolytic capacitor manufactured by Chemi-Con in the KMS series. This radial, can-style snap-in capacitor is designed for general-purpose applications requiring high voltage energy storage and filtering. The component features a 3000-hour lifetime rating at 105°C and operates across a temperature range of -25°C to 105°C. The part maintains Active product status and is ROHS3 compliant. Equivalent and substitute parts are identified to provide alternative sourcing options when the primary part is unavailable or when inventory requirements necessitate alternative manufacturers.

Substiute Parts

EKMS421VSN331MA30S

Chemi-ConIn Stock: 1188EKMS421VSN331MA30S Datasheet

Current PartRFQ

LQSW6331MELC30

NichiconIn Stock: 274056LQSW6331MELC30 Datasheet

DirectRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution of the EKMS421VSN331MA30S is determined by strict equivalence across the following critical parameters:

Electrical Parameters:

• Capacitance: 330 µF (exact match required)
• Voltage Rating: 420 V (exact match required)
• Tolerance: ±20% (exact match required)
• Lifetime: 3000 Hrs @ 105°C (exact match required)
• Operating Temperature Range: -25°C ~ 105°C (exact match required)
• Polarization: Polar (exact match required)

Mechanical Parameters:

• Package Type: Radial, Can - Snap-In (exact match required)
• 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)

Compliance Parameters:

• RoHS Status: ROHS3 Compliant (exact match required)

The substitute part LQSW6331MELC30 manufactured by Nichicon meets all critical electrical, mechanical, and compliance requirements for direct substitution. Variations in ripple current ratings and maximum seated height within acceptable tolerances do not preclude substitution when all primary parameters align.

Parameter Comparison

Engineering Selection Recommendations

Both the EKMS421VSN331MA30S and LQSW6331MELC30 are Active product status components with full ROHS3 compliance and REACH unaffected status. Selection between these parts is based on availability and application-specific ripple current requirements.

The EKMS421VSN331MA30S (Chemi-Con KMS series) provides higher ripple current capacity at both low frequency (1.55 A @ 120 Hz) and high frequency (2.2165 A @ 50 kHz) operation.

The LQSW6331MELC30 (Nichicon LQS series) delivers reduced ripple current ratings (1.42 A @ 120 Hz and 2.0306 A @ 50 kHz) and a marginally reduced maximum seated height (1.260" versus 1.280"). Both components share identical electrical specifications, mechanical footprint, and compliance certifications.

Selection should prioritize the component with superior ripple current performance when thermal management or high-frequency filtering demands are critical to circuit operation. When ripple current requirements are within the lower specification, either part is functionally equivalent.

Frequently Asked Questions (FAQ)

Q: Can LQSW6331MELC30 directly replace EKMS421VSN331MA30S in existing designs?

A: Yes. Both components share identical capacitance (330 µF), voltage rating (420 V), tolerance (±20%), lifetime (3000 Hrs @ 105°C), operating temperature range (-25°C ~ 105°C), lead spacing (10.00 mm), case diameter (35.00 mm), and mounting type (Through Hole, Radial Can - Snap-In). The maximum seated height difference (0.20 mm) is within standard mechanical tolerances for snap-in mounting applications.

Q: What is the difference in ripple current performance between these parts?

A: The EKMS421VSN331MA30S delivers 1.55 A @ 120 Hz and 2.2165 A @ 50 kHz. The LQSW6331MELC30 delivers 1.42 A @ 120 Hz and 2.0306 A @ 50 kHz. The Chemi-Con part provides approximately 9% higher ripple current capacity at low frequency and 9% higher capacity at high frequency. Applications with stringent thermal or high-frequency filtering requirements should specify the higher-rated component.

Q: Are both parts RoHS3 compliant?

A: Yes. Both EKMS421VSN331MA30S and LQSW6331MELC30 are ROHS3 compliant and REACH unaffected, meeting current environmental and regulatory requirements.

Q: What is the significance of the snap-in package type?

A: The snap-in package type indicates these capacitors are designed for through-hole mounting with mechanical retention via snap-fit terminals. This package style is common in high-voltage power supply and industrial filtering applications. Both substitute parts use identical snap-in mechanical interfaces, ensuring compatibility with existing PCB designs and mounting hardware.

Q: Can these parts be used interchangeably in high-frequency applications?

A: Both parts are rated for high-frequency ripple current operation at 50 kHz. However, the EKMS421VSN331MA30S provides superior high-frequency ripple current capacity (2.2165 A versus 2.0306 A). For applications operating continuously at or near maximum ripple current specifications, the Chemi-Con part is preferred to ensure adequate thermal margin.

Q: What is the lead spacing and how does it affect PCB design?

A: Both parts feature 0.394" (10.00 mm) lead spacing. This dimension defines the distance between the two radial leads and directly corresponds to PCB pad spacing. Designs accommodating either part require identical pad layouts and through-hole diameters, confirming full mechanical interchangeability.