KMQ400VS331M25X45T2 Equivalent & Substitute Parts

Part Overview

The KMQ400VS331M25X45T2 is a 330 µF, 400 V aluminum electrolytic capacitor manufactured by Chemi-Con in the KMQ series. This radial, can-style snap-in capacitor is designed for general-purpose applications requiring high voltage energy storage and filtering. The part is classified as obsolete, necessitating identification of equivalent substitute components that maintain electrical and mechanical compatibility with existing circuit designs.

Substiute Parts

KMQ400VS331M25X45T2

Chemi-ConIn Stock: 785KMQ400VS331M25X45T2 Datasheet

Current PartRFQ

EKMQ401VSN331MQ45S

Chemi-ConIn Stock: 3283EKMQ401VSN331MQ45S Datasheet

SimilarRFQ

400MXK330MEFCSN25X35

RubyconIn Stock: 1322400MXK330MEFCSN25X35 Datasheet

DirectRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitute parts for the KMQ400VS331M25X45T2 are qualified based on the following electrical and mechanical parameters:

Electrical Compatibility Criteria:

• Capacitance value: 330 µF (exact match required)
• Voltage rating: 400 V (minimum, no derating)
• Tolerance: ±20% (standard for aluminum electrolytic capacitors)
• Operating temperature range: -25°C to 105°C (minimum requirement)
• Polarization: Polar (mandatory for circuit function)

Mechanical Compatibility Criteria:

• Lead spacing: 0.394" (10.00 mm) (PCB hole pattern match)
• Mounting type: Through Hole (assembly compatibility)
• Package style: Radial, Can - Snap-In (form factor and retention method)

Performance Considerations:

• Lifetime rating at 105°C: 2000 hours minimum
• Ripple current capability at operating frequencies

Substitute parts meeting all electrical and mechanical criteria are listed below. Dimensional variations within the snap-in envelope and enhanced lifetime ratings do not preclude substitution.

Parameter Comparison

Engineering Selection Recommendations

EKMQ401VSN331MQ45S (Chemi-Con): This substitute maintains identical electrical specifications and mechanical dimensions to the main part. As an active product from the same manufacturer and series, it provides direct functional equivalence. ROHS3 compliance offers regulatory advantage over the obsolete KMQ400VS331M25X45T2. Identical ripple current ratings and lifetime specifications ensure performance parity in existing circuit designs.

400MXK330MEFCSN25X35 (Rubycon): This substitute meets all core electrical requirements with identical capacitance, voltage rating, tolerance, and operating temperature range. The MXK series offers enhanced lifetime rating of 3000 hours at 105°C, exceeding the 2000-hour specification of the main part. Mechanical dimensions are within the snap-in envelope, with reduced height (37.00 mm vs. 47.00 mm) and slightly smaller diameter (25.00 mm vs. 25.40 mm). Ripple current capability is superior at both low and high frequencies. ROHS3 compliance is provided. This part is suitable for applications where improved reliability and regulatory compliance are required.

Both substitute parts are active products with current manufacturing status and full RoHS3 compliance, addressing the obsolescence of the original component.

Frequently Asked Questions (FAQ)

Q: Can EKMQ401VSN331MQ45S directly replace KMQ400VS331M25X45T2 without PCB modification?

A: Yes. Both parts share identical lead spacing (10.00 mm), mounting type (through hole), and package style (radial, can - snap-in). Electrical specifications are identical. No PCB layout changes are required.

Q: Can 400MXK330MEFCSN25X35 be used as a direct substitute?

A: Yes, with dimensional verification. Lead spacing is identical (10.00 mm), and the package style is compatible. The reduced height (37.00 mm vs. 47.00 mm) and slightly smaller diameter (25.00 mm vs. 25.40 mm) remain within the snap-in envelope. Physical clearance around the component location should be confirmed to ensure no interference with adjacent components or enclosure features.

Q: What is the significance of the lifetime rating difference between the main part and substitutes?

A: The main part specifies 2000 hours at 105°C. EKMQ401VSN331MQ45S matches this specification. 400MXK330MEFCSN25X35 provides 3000 hours at 105°C, representing extended operational life under thermal stress. Both meet or exceed the minimum requirement; the higher rating does not create incompatibility.

Q: Are there differences in ripple current handling?

A: All three parts handle ripple current at 120 Hz identically (1.44 A for Chemi-Con parts; 1.65 A for Rubycon). At high frequencies, ripple current ratings differ slightly due to series design variations. The Rubycon part (2.31 A @ 10 kHz) provides higher capacity than the main part (2.0592 A @ 50 kHz). Circuit ripple current requirements should be verified against the selected substitute.

Q: What is the impact of RoHS3 compliance?

A: The main part is RoHS non-compliant. Both substitutes are ROHS3 compliant, meeting current environmental and regulatory standards for electronic components. This is advantageous for new designs and compliance documentation.

Q: Does ESR (Equivalent Series Resistance) affect substitution?

A: The main part specifies 754 mOhm @ 120 Hz. ESR data is not provided for the substitute parts. ESR affects ripple current dissipation and thermal performance. If ESR is critical to circuit function, contact the manufacturer for detailed specifications before final selection.

Q: Can these parts be used interchangeably in the same circuit?

A: Yes, within the constraints noted. All three parts meet the core electrical requirements (330 µF, 400 V, ±20%, -25°C to 105°C). Mechanical compatibility is confirmed for through-hole snap-in mounting with 10.00 mm lead spacing. Physical dimensions should be verified for the Rubycon part due to reduced height and diameter.