ESMM421VSN331MR35U Equivalent & Substitute Parts

Part Overview

The ESMM421VSN331MR35U is a 330 µF, 420 V aluminum electrolytic capacitor manufactured by Chemi-Con in the SMM series. This radial, can-style snap-in capacitor is designed for general-purpose applications requiring stable capacitance and extended operational life. The part is Active in product status and RoHS Compliant, making it suitable for modern industrial and commercial equipment.

Substitute parts are identified when equivalent electrical and mechanical parameters are maintained within the allowed tolerances for this capacitor category. Substitution becomes necessary due to inventory availability, supply chain considerations, or design optimization while preserving circuit performance.

Substiute Parts

ESMM421VSN331MR35U

Chemi-ConIn Stock: 1132ESMM421VSN331MR35U Datasheet

Current PartRFQ

450USG330MEFCSN30X35

RubyconIn Stock: 1273450USG330MEFCSN30X35 Datasheet

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LQSW6331MELB35

NichiconIn Stock: 273932LQSW6331MELB35 Datasheet

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Key Parameters

Substitute Part Grouping Explanation

Substitute parts for the ESMM421VSN331MR35U are qualified based on the following criteria:

Primary Electrical Parameters:

• Capacitance: 330 µF (exact match required)
• Tolerance: ±20% (exact match required)
• Voltage Rating: 420 V or higher (equal or greater voltage rating is acceptable)
• Lifetime: 3000 Hrs minimum at rated temperature

Mechanical Parameters:

• Lead Spacing: 0.394" (10.00mm) (exact match required)
• Size / Dimension: 1.181" Dia (30.00mm) (exact match required)
• Height - Seated (Max): 1.457" (37.00mm) (exact match required)
• Package / Case: Radial, Can - Snap-In (exact match required)
• Mounting Type: Through Hole (exact match required)

Compliance Parameters:

• RoHS Status: RoHS Compliant or ROHS3 Compliant
• REACH Status: REACH Unaffected
• Polarization: Polar (exact match required)

Two substitute parts meet these criteria and are listed below.

Parameter Comparison

Engineering Selection Recommendations

LQSW6331MELB35 (Nichicon LQS Series)

This substitute maintains identical voltage rating (420 V) and capacitance (330 µF) with the main part. The extended operating temperature range (-25°C ~ 105°C) and higher temperature lifetime rating (3000 Hrs @ 105°C) provide enhanced thermal performance. ROHS3 Compliant status confirms current regulatory alignment. Inventory availability is substantial (273,882 Pcs). This part is suitable for direct substitution in applications where thermal margin is beneficial.

450USG330MEFCSN30X35 (Rubycon USG Series)

This substitute provides a higher voltage rating (450 V) while maintaining the same capacitance (330 µF) and mechanical form factor. The elevated voltage rating offers additional safety margin in circuits operating near the 420 V specification. ROHS3 Compliant status and REACH Unaffected designation confirm compliance. Inventory availability is adequate (1,246 Pcs). This part is suitable for substitution in applications where voltage headroom is advantageous.

Both substitutes maintain identical mechanical dimensions, lead spacing, and package configuration, ensuring direct PCB compatibility without layout modifications.

Frequently Asked Questions (FAQ)

Q: Can LQSW6331MELB35 replace ESMM421VSN331MR35U in all applications?

A: Yes. The LQSW6331MELB35 maintains identical capacitance (330 µF), tolerance (±20%), and voltage rating (420 V). Mechanical dimensions and lead spacing are identical. The extended operating temperature range and higher temperature lifetime rating do not restrict compatibility; they provide additional performance margin.

Q: What is the difference between the 420 V and 450 V rated substitutes?

A: The 450USG330MEFCSN30X35 provides a higher voltage rating (450 V) compared to the main part and the LQSW6331MELB35 (both 420 V). All other electrical and mechanical parameters remain equivalent. The higher voltage rating provides additional safety margin in circuits operating near maximum voltage specifications.

Q: Are all three parts mechanically interchangeable?

A: Yes. All three parts share identical lead spacing (0.394" / 10.00mm), diameter (1.181" / 30.00mm), and maximum seated height (1.457" / 37.00mm). All are radial, can-style snap-in packages with through-hole mounting. No PCB layout modifications are required for substitution.

Q: Do the substitute parts meet current RoHS requirements?

A: Yes. The LQSW6331MELB35 and 450USG330MEFCSN30X35 are both ROHS3 Compliant. The main part ESMM421VSN331MR35U is RoHS Compliant. All three parts are REACH Unaffected.

Q: What is the significance of the different lifetime ratings?

A: The LQSW6331MELB35 specifies 3000 Hrs @ 105°C, while the main part and 450USG330MEFCSN30X35 specify 3000 Hrs @ 85°C. Both meet the minimum 3000-hour lifetime requirement. The Nichicon part demonstrates extended thermal performance at higher temperatures, which may be relevant for applications with elevated ambient conditions.

Q: Can these parts be used interchangeably in existing designs without testing?

A: Substitution is based on equivalent electrical and mechanical parameters. All three parts maintain the same capacitance, tolerance, lead spacing, and package configuration. Selection between them depends on voltage rating requirements and thermal operating conditions of the specific application.