EKMM401VSN391MA35S Equivalent & Substitute Parts

Part Overview

The EKMM401VSN391MA35S is a 390 µF, 400 V aluminum electrolytic capacitor manufactured by Chemi-Con in the KMM series. This radial, can-style snap-in capacitor is rated for 3000 hours at 105°C and is designed for general-purpose applications requiring high-voltage energy storage and filtering. The part is currently active in production with 998 units in stock.

Substitute parts are identified when they match the critical electrical and mechanical parameters that define functional equivalence in this capacitor category: capacitance value, voltage rating, tolerance, lifetime rating, operating temperature range, physical dimensions, lead spacing, and mounting configuration.

Key Parameters

Parameter	Value
Capacitance	390 µF
Voltage Rating	400 V
Tolerance	±20%
Lifetime @ Temperature	3000 Hrs @ 105°C
Operating Temperature Range	-25°C ~ 105°C
Polarization	Polar
Package Type	Radial, Can - Snap-In
Lead Spacing	0.394" (10.00mm)
Diameter	1.378" (35.00mm)
Height (Seated Max)	1.457" (37.00mm)
Mounting Type	Through Hole

Substitute Part Grouping Explanation

Substitution eligibility for the EKMM401VSN391MA35S is determined by strict equivalence across the following parameters:

Capacitance: 390 µF (exact match required)
Voltage Rating: 400 V (exact match required)
Tolerance: ±20% (exact match required)
Lifetime Rating: 3000 Hrs @ 105°C (exact match required)
Operating Temperature: -25°C ~ 105°C (exact match required)
Polarization: Polar (exact match required)
Package Configuration: Radial, Can - Snap-In (exact match required)
Lead Spacing: 0.394" (10.00mm) (exact match required)
Physical Dimensions: 1.378" Dia × 1.457" Height (exact match required)
Mounting: Through Hole (exact match required)

The substitute part 381LR391M400A032 from Cornell Dubilier Electronics meets all these criteria and is therefore a direct functional equivalent.

Parameter Comparison

Parameter	EKMM401VSN391MA35S (Chemi-Con KMM)	381LR391M400A032 (CDE 381LR)
Manufacturer	Chemi-Con	Cornell Dubilier Electronics (CDE)
Capacitance	390 µF	390 µF
Voltage Rating	400 V	400 V
Tolerance	±20%	±20%
Lifetime @ Temperature	3000 Hrs @ 105°C	3000 Hrs @ 105°C
Operating Temperature	-25°C ~ 105°C	-25°C ~ 105°C
Polarization	Polar	Polar
Package Type	Radial, Can - Snap-In	Radial, Can - Snap-In
Lead Spacing	0.394" (10.00mm)	0.394" (10.00mm)
Diameter	1.378" (35.00mm)	1.378" (35.00mm)
Height (Seated Max)	1.457" (37.00mm)	1.457" (37.00mm)
Mounting Type	Through Hole	Through Hole
Product Status	Active	Active
Inventory Status	998 Pcs New Original In Stock	1640 Pcs New Original In Stock

Engineering Selection Recommendations

Both the EKMM401VSN391MA35S and 381LR391M400A032 are active production parts with full parametric equivalence. Selection between these parts should be based on:

Availability: The 381LR391M400A032 has higher inventory (1640 units) compared to the EKMM401VSN391MA35S (998 units).
Compliance: The 381LR391M400A032 carries ROHS3 compliance certification and REACH Unaffected status, providing additional regulatory documentation.
Moisture Sensitivity: The 381LR391M400A032 is rated MSL 1 (Unlimited), indicating no moisture sensitivity constraints during storage and handling.

Both parts are suitable for direct substitution in applications requiring 390 µF, 400 V aluminum electrolytic capacitors with snap-in mounting and 3000-hour lifetime ratings at 105°C.

Frequently Asked Questions (FAQ)

Q: Can the 381LR391M400A032 be used as a direct replacement for the EKMM401VSN391MA35S?

A: Yes. Both parts are parametrically equivalent across all critical specifications: 390 µF capacitance, 400 V voltage rating, ±20% tolerance, 3000 Hrs @ 105°C lifetime, identical physical dimensions (1.378" diameter, 1.457" height), 10.00mm lead spacing, and radial snap-in package configuration. No circuit modifications or PCB layout changes are required.

Q: Are there any differences in ripple current ratings between these parts?

A: The ripple current specifications differ slightly. The EKMM401VSN391MA35S is rated 1.6 A @ 120 Hz and 2.288 A @ 50 kHz. The 381LR391M400A032 is rated 1.85 A @ 120 Hz and 2.64 A @ 20 kHz. These differences do not affect substitution eligibility, as both parts meet the functional requirements of the 390 µF, 400 V category.

Q: What is the significance of the ESR specification listed for the 381LR391M400A032?

A: The 381LR391M400A032 specifies ESR (Equivalent Series Resistance) at 340 mOhm @ 120 Hz. This parameter is not provided for the EKMM401VSN391MA35S in the available data. ESR affects ripple current handling and thermal performance but does not disqualify substitution when the primary electrical and mechanical parameters match.

Q: Are both parts suitable for the same PCB footprint and mounting configuration?

A: Yes. Both parts use identical through-hole radial snap-in mounting with 10.00mm lead spacing and 35.00mm diameter cans. PCB footprints, hole spacing, and snap-in fixture compatibility are identical. No mechanical redesign is necessary.

Q: Which part should be selected for new designs?

A: Selection should be based on supply chain availability and regulatory requirements. The 381LR391M400A032 offers higher inventory availability and explicit ROHS3 and REACH compliance documentation. The EKMM401VSN391MA35S remains a valid choice where Chemi-Con KMM series parts are specified or preferred.

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