ALC40A331CF400 Equivalent & Substitute Parts

Part Overview

The ALC40A331CF400 is a 330 µF, 400 V aluminum electrolytic capacitor manufactured by KEMET in the ALC40 series. This radial, can-style snap-in capacitor is designed for general-purpose applications requiring high voltage energy storage and filtering. The part is currently active in production with 1147 units in stock.

Equivalent and substitute parts are identified when alternative components meet the same electrical specifications and mechanical requirements, enabling procurement flexibility, inventory optimization, and supply chain continuity.

Substiute Parts

ALC40A331CF400

KEMETIn Stock: 1197ALC40A331CF400 Datasheet

Current PartRFQ

ALC40A331DD400

KEMETIn Stock: 1731ALC40A331DD400 Datasheet

SimilarRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution eligibility for the ALC40A331CF400 is determined by strict equivalence across the following critical parameters:

Electrical Equivalence Requirements:

• Capacitance: 330 µF (exact match)
• Voltage Rating: 400 V (exact match)
• Tolerance: ±20% (exact match)
• Polarization: Polar (exact match)

Mechanical Compatibility Requirements:

• Mounting Type: Through Hole (exact match)
• Package Style: Radial, Can - Snap-In (exact match)
• Lead Spacing: 10.00 mm (exact match)

Compliance Requirements:

• RoHS Status: ROHS3 Compliant (exact match)
• Series: ALC40 (same manufacturer series)

The substitute part ALC40A331DD400 meets all electrical and mechanical equivalence criteria. Variations in physical dimensions (diameter and height), ESR, ripple current ratings, and lifetime specifications do not disqualify substitution when the core electrical parameters and mounting interface remain identical.

Parameter Comparison

Engineering Selection Recommendations

Both ALC40A331CF400 and ALC40A331DD400 are active production parts manufactured by KEMET with ROHS3 compliance and REACH unaffected status. Selection between these parts is based on the following factors:

ALC40A331CF400 Selection Criteria:

• Smaller physical footprint required (30.00 mm diameter, 52.00 mm height)
• Specified ESR tolerance of 383 mOhm @ 100Hz
• Application requires 7000-hour minimum lifetime at 105°C

ALC40A331DD400 Selection Criteria:

• Larger physical footprint acceptable (35.00 mm diameter, 42.00 mm height)
• Extended lifetime requirement (8000 hours @ 105°C)
• ESR specification of 386 mOhm @ 100Hz acceptable
• Lower profile mounting preferred (42.00 mm vs. 52.00 mm)

Both parts maintain identical electrical performance for capacitance, voltage rating, tolerance, and operating temperature range. The choice between them depends solely on PCB layout constraints and mechanical space availability, as the snap-in mounting interface and lead spacing remain constant.

Frequently Asked Questions (FAQ)

Q: Can ALC40A331DD400 be used as a direct replacement for ALC40A331CF400?

A: Yes, for electrical circuit function. Both parts are 330 µF, 400 V, ±20% tolerance capacitors with identical lead spacing (10.00 mm) and snap-in mounting interface. However, physical dimensions differ: ALC40A331DD400 is larger in diameter (35.00 mm vs. 30.00 mm) but shorter in height (42.00 mm vs. 52.00 mm). PCB layout must accommodate these dimensional differences.

Q: What are the key parameters that determine substitution eligibility?

A: Substitution is valid when the following parameters match exactly: capacitance (330 µF), voltage rating (400 V), tolerance (±20%), polarization (polar), mounting type (through hole), package style (radial, can - snap-in), and lead spacing (10.00 mm). Variations in ESR, ripple current, lifetime, and physical dimensions do not prevent substitution if these core parameters remain identical.

Q: Are there compliance differences between these parts?

A: No. Both ALC40A331CF400 and ALC40A331DD400 are ROHS3 compliant, REACH unaffected, and carry identical ECCN (EAR99) and HTSUS (8532.22.0040) classifications.

Q: How do the ESR and lifetime specifications differ?

A: ALC40A331CF400 has 383 mOhm ESR @ 100Hz with 7000-hour lifetime at 105°C. ALC40A331DD400 has 386 mOhm ESR @ 100Hz with 8000-hour lifetime at 105°C. These differences are minor and do not affect functional equivalence for general-purpose applications.

Q: What is the primary constraint when selecting between these two parts?

A: Physical dimensions and available PCB space. ALC40A331CF400 is narrower but taller; ALC40A331DD400 is wider but shorter. Lead spacing and mounting interface are identical, so the choice depends on whether your design accommodates the dimensional profile of each part.