ERWF401LGN392MDD0M Equivalent & Substitute Parts

Part Overview

The ERWF401LGN392MDD0M is a 3900 µF, 400 V aluminum electrolytic capacitor manufactured by Chemi-Con in the RWF series. This component features radial, can-style construction with screw terminals, designed for chassis mount applications requiring general-purpose energy storage and filtering. The part is classified as obsolete, necessitating identification of active equivalent alternatives that maintain electrical and mechanical compatibility for continued system support and new production requirements.

Key Parameters

Parameter	Value
Capacitance	3900 µF
Voltage Rating	400 V
Tolerance	±20%
Lifetime @ Temperature	5000 Hrs @ 85°C
Operating Temperature Range	-25°C ~ 85°C
Ripple Current @ 120 Hz	12.7 A
Ripple Current @ High Frequency	17.78 A @ 3 kHz
Package Type	Radial, Can - Screw Terminals
Mounting Type	Chassis Mount
Lead Spacing	1.125" (28.58 mm)
Diameter	2.500" (63.50 mm)
Height	5.125" (130.18 mm)
Polarization	Polar

Substitute Part Grouping Explanation

Substitution eligibility for the ERWF401LGN392MDD0M is determined by the following critical parameters:

Electrical Equivalence Requirements:

Capacitance: 3900 µF (exact match)
Voltage Rating: 400 V (exact match)
Tolerance: ±20% (exact match)
Lifetime: 5000 Hrs @ 85°C (exact match)
Operating Temperature: -25°C ~ 85°C (exact match)
Polarization: Polar (exact match)

Mechanical Compatibility Requirements:

Package Type: Radial, Can - Screw Terminals (exact match)
Mounting Type: Chassis Mount (exact match)
Lead Spacing: 1.125" ± tolerance (28.58 mm nominal)
Diameter: 2.500" (63.50 mm)
Height: Within acceptable range for screw terminal clearance

Compliance Requirements:

RoHS Status: RoHS Compliant or ROHS3 Compliant
ECCN: EAR99
HTSUS: 8532.22.0085

All four substitute parts meet these criteria. The Chemi-Con ERWF401LGN392MDD0U is a direct series continuation with identical specifications and active product status. The three Nichicon LNK series parts (LNK2G392MSEG, LNK2G392MSEGBB, LNK2G392MSEGBN) provide cross-manufacturer equivalence with minor dimensional variations in height that remain within acceptable installation tolerances.

Parameter Comparison

Parameter	ERWF401LGN392MDD0M (Main)	ERWF401LGN392MDD0U	LNK2G392MSEG	LNK2G392MSEGBB	LNK2G392MSEGBN
Manufacturer	Chemi-Con	Chemi-Con	Nichicon	Nichicon	Nichicon
Series	RWF	RWF	LNK	LNK	LNK
Product Status	Obsolete	Active	Active	Active	Active
Capacitance	3900 µF	3900 µF	3900 µF	3900 µF	3900 µF
Voltage Rating	400 V	400 V	400 V	400 V	400 V
Tolerance	±20%	±20%	±20%	±20%	±20%
Lifetime @ 85°C	5000 Hrs	5000 Hrs	5000 Hrs	5000 Hrs	5000 Hrs
Operating Temperature	-25°C ~ 85°C	-25°C ~ 85°C	-25°C ~ 85°C	-25°C ~ 85°C	-25°C ~ 85°C
Ripple Current @ 120 Hz	12.7 A	12.7 A	12.8 A	12.8 A	12.8 A
Ripple Current @ High Frequency	17.78 A @ 3 kHz	17.78 A @ 3 kHz	17.92 A @ 10 kHz	17.92 A @ 10 kHz	17.92 A @ 10 kHz
Lead Spacing	1.125" (28.58 mm)	1.125" (28.58 mm)	1.126" (28.60 mm)	1.126" (28.60 mm)	1.126" (28.60 mm)
Diameter	2.500" (63.50 mm)	2.500" (63.50 mm)	2.500" (63.50 mm)	2.500" (63.50 mm)	2.500" (63.50 mm)
Height	5.125" (130.18 mm)	5.125" (130.18 mm)	4.528" (115.00 mm)	4.646" (118.00 mm)	4.646" (118.00 mm)
Package Type	Radial, Can - Screw Terminals	Radial, Can - Screw Terminals	Radial, Can - Screw Terminals	Radial, Can - Screw Terminals	Radial, Can - Screw Terminals
Mounting Type	Chassis Mount	Chassis Mount	Chassis Mount	Chassis Mount	Chassis Mount
RoHS Status	RoHS Compliant	RoHS Compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant
REACH Status	REACH Unaffected	REACH Unaffected	REACH Affected	REACH Affected	REACH Affected
Inventory Status	790 Pcs	966 Pcs	875 Pcs	861 Pcs	1112 Pcs

Engineering Selection Recommendations

Primary Recommendation: ERWF401LGN392MDD0U

The ERWF401LGN392MDD0U is the preferred substitute for the obsolete ERWF401LGN392MDD0M. Both components are manufactured by Chemi-Con within the RWF series and share identical electrical specifications, mechanical dimensions, and compliance certifications. The ERWF401LGN392MDD0U maintains active product status with 966 units in current inventory, ensuring long-term supply chain continuity. This part requires no design modifications and provides direct form-fit-function replacement.

Secondary Recommendations: Nichicon LNK Series

The three Nichicon LNK series alternatives (LNK2G392MSEG, LNK2G392MSEGBB, LNK2G392MSEGBN) provide cross-manufacturer equivalence with the following considerations:

All three parts meet identical electrical specifications and operating parameters
Height dimensions vary: LNK2G392MSEG (4.528"), LNK2G392MSEGBB (4.646"), LNK2G392MSEGBN (4.646")
These height reductions from the original 5.125" remain compatible with standard chassis mount installations
Lead spacing tolerance (1.126" vs. 1.125") is within acceptable mechanical clearance
Ripple current specifications at high frequency (17.92 A @ 10 kHz) exceed the original requirement (17.78 A @ 3 kHz)
All three parts carry ROHS3 Compliant and REACH Affected designations

Compliance Considerations:

ERWF401LGN392MDD0U maintains RoHS Compliant and REACH Unaffected status, matching the original part
Nichicon LNK series parts carry ROHS3 Compliant status, representing current regulatory compliance
All parts share identical ECCN (EAR99) and HTSUS (8532.22.0085) classifications

Inventory Availability:

LNK2G392MSEGBN offers the highest inventory level (1112 units)
ERWF401LGN392MDD0U provides 966 units
LNK2G392MSEG and LNK2G392MSEGBB provide 875 and 861 units respectively

Frequently Asked Questions (FAQ)

Q: Can the ERWF401LGN392MDD0U directly replace the ERWF401LGN392MDD0M without any modifications?

A: Yes. The ERWF401LGN392MDD0U is a direct replacement. Both parts are manufactured by Chemi-Con in the RWF series with identical capacitance (3900 µF), voltage rating (400 V), tolerance (±20%), lifetime (5000 Hrs @ 85°C), operating temperature range (-25°C ~ 85°C), package type (Radial, Can - Screw Terminals), and mechanical dimensions. No circuit modifications or PCB layout changes are required.

Q: What are the key differences between the Chemi-Con RWF and Nichicon LNK series parts?

A: The primary differences are manufacturer and height dimension. Chemi-Con RWF parts maintain the original 5.125" height, while Nichicon LNK parts are shorter (4.528" to 4.646"). All parts share identical electrical specifications. The Nichicon parts carry ROHS3 Compliant status versus RoHS Compliant for Chemi-Con, and REACH Affected versus REACH Unaffected. Lead spacing differs by 0.001" (0.02 mm), which is negligible for screw terminal applications.

Q: Are the Nichicon LNK series parts suitable for existing designs using the ERWF401LGN392MDD0M?

A: Yes, with height verification. The Nichicon LNK parts provide electrical equivalence and mechanical compatibility. The reduced height (4.528" to 4.646" versus 5.125") may require clearance verification in the installation space, but this reduction typically accommodates standard chassis mount configurations. Lead spacing tolerance (1.126" versus 1.125") is within acceptable mechanical clearance for screw terminal connections.

Q: What is the significance of the ripple current differences between parts?

A: The original ERWF401LGN392MDD0M specifies 17.78 A @ 3 kHz. The Nichicon LNK series specifies 17.92 A @ 10 kHz. The higher frequency specification (10 kHz versus 3 kHz) and slightly higher current rating (17.92 A) indicate enhanced performance capability. These differences do not affect substitution compatibility; the Nichicon parts exceed the original ripple current requirements.

Q: What compliance differences exist between the substitute parts?

A: The ERWF401LGN392MDD0U maintains RoHS Compliant and REACH Unaffected status, matching the original part. The Nichicon LNK series carries ROHS3 Compliant and REACH Affected designations, representing current regulatory standards. All parts share identical ECCN (EAR99) and HTSUS (8532.22.0085) classifications. Selection between these options depends on regulatory requirements for the end application.

Q: Which substitute part should be selected for new production?

A: For new production requiring regulatory alignment with current standards, the Nichicon LNK2G392MSEGBN is recommended. It offers the highest inventory availability (1112 units), ROHS3 Compliant status, and identical electrical performance. For applications requiring REACH Unaffected status, the ERWF401LGN392MDD0U maintains compatibility with the original specification. Both selections provide equivalent electrical function and mechanical fit.

Q: Are there any thermal or reliability differences between these parts?

A: All substitute parts share identical thermal specifications: 5000 Hrs @ 85°C lifetime and -25°C ~ 85°C operating temperature range. No thermal or reliability differences exist between the ERWF401LGN392MDD0M and its substitutes. All parts are rated for the same environmental conditions and expected service life.

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