Equivalent & Substitute Parts for UCS2W390MND9

Part Overview

The UCS2W390MND9 is a 39 µF, 450 V aluminum electrolytic capacitor in radial, can package manufactured by Nichicon. This component is rated for 10000 hours at 105°C and is designed for general purpose applications. The part is currently active in production with full RoHS3 compliance. Substitute parts may be required due to inventory constraints, application-specific performance requirements, or design optimization needs.

Key Parameters

Parameter	Value
Capacitance	39 µF
Voltage Rating	450 V
Tolerance	±20%
Package Type	Radial, Can
Mounting Type	Through Hole
Lead Spacing	0.197" (5.00 mm)
Operating Temperature Range	-25°C to 105°C
Polarization	Polar

Substitute Part Grouping Explanation

Substitution eligibility for the UCS2W390MND9 is determined by the following mandatory parameters:

Capacitance value: 39 µF (exact match required)
Voltage rating: 450 V (exact match required)
Tolerance: ±20% (exact match required)
Package type: Radial, Can (exact match required)
Mounting type: Through Hole (exact match required)
Lead spacing: 0.197" (5.00 mm) (exact match required)
Polarization: Polar (exact match required)

Two substitute parts meet these criteria:

UPT2W390MHD (Nichicon, UPT series) — Direct equivalent with reduced lifetime rating
EKXJ451ELL390MJ50S (Chemi-Con, KXJ series) — Enhanced performance variant with extended lifetime and automotive qualification

Parameter Comparison

Parameter	UCS2W390MND9	UPT2W390MHD	EKXJ451ELL390MJ50S
Manufacturer	Nichicon	Nichicon	Chemi-Con
Series	UCS	UPT	KXJ
Capacitance	39 µF	39 µF	39 µF
Voltage Rating	450 V	450 V	450 V
Tolerance	±20%	±20%	±20%
Lifetime @ 105°C	10000 Hrs	5000 Hrs	12000 Hrs
Operating Temperature	-25°C to 105°C	-25°C to 105°C	-40°C to 105°C
Lead Spacing	0.197" (5.00 mm)	0.197" (5.00 mm)	0.197" (5.00 mm)
Size / Dimension	0.394" Dia (10.00 mm)	0.492" Dia (12.50 mm)	0.394" Dia (10.00 mm)
Height - Seated (Max)	2.047" (52.00 mm)	1.634" (41.50 mm)	2.028" (51.50 mm)
Ripple Current @ 120 Hz	410 mA	320 mA	375 mA
Ripple Current @ 100 kHz	820 mA	Not specified	937.5 mA
Package / Case	Radial, Can	Radial, Can	Radial, Can
RoHS Status	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant
Product Status	Active	Active	Active

Engineering Selection Recommendations

UPT2W390MHD is a direct equivalent from the same manufacturer (Nichicon) with identical electrical specifications. However, the lifetime rating is reduced to 5000 hours at 105°C compared to 10000 hours for the UCS2W390MND9. The physical dimensions differ, with a larger diameter (0.492" vs 0.394") and shorter height (1.634" vs 2.047"), which may impact PCB layout compatibility. This part is suitable for applications where the reduced lifetime is acceptable and space constraints favor the smaller height profile.

EKXJ451ELL390MJ50S is an enhanced variant manufactured by Chemi-Con with extended lifetime (12000 hours at 105°C) and broader operating temperature range (-40°C to 105°C). This part carries AEC-Q200 automotive qualification and higher ripple current ratings at both 120 Hz and 100 kHz. Physical dimensions are nearly identical to the main part, with lead spacing and diameter matching exactly. This part is suitable for applications requiring extended reliability, automotive-grade components, or higher ripple current handling.

Frequently Asked Questions (FAQ)

Q: Can UPT2W390MHD be used as a direct drop-in replacement for UCS2W390MND9?

A: Electrically, yes. However, the physical dimensions differ significantly. The UPT2W390MHD has a larger diameter (12.50 mm vs 10.00 mm) and shorter height (41.50 mm vs 52.00 mm). PCB layout verification is required to confirm fit within the available space.

Q: What is the primary difference between UCS2W390MND9 and EKXJ451ELL390MJ50S?

A: The EKXJ451ELL390MJ50S offers extended lifetime (12000 hours vs 10000 hours at 105°C), broader temperature range (-40°C to 105°C vs -25°C to 105°C), and automotive qualification (AEC-Q200). Physical dimensions are nearly identical, making it a direct mechanical fit.

Q: Is the UPT2W390MHD suitable for long-term reliability applications?

A: The UPT2W390MHD has a rated lifetime of 5000 hours at 105°C, which is half that of the UCS2W390MND9. Applications requiring extended operational life should consider the EKXJ451ELL390MJ50S instead.

Q: Are all three parts RoHS3 compliant?

A: Yes. UCS2W390MND9, UPT2W390MHD, and EKXJ451ELL390MJ50S are all ROHS3 compliant.

Q: Can EKXJ451ELL390MJ50S be used in non-automotive applications?

A: Yes. The AEC-Q200 automotive qualification indicates enhanced reliability and stricter quality standards, making it suitable for any application requiring high reliability, regardless of automotive use.

Q: What is the impact of the larger diameter of UPT2W390MHD on circuit board design?

A: The UPT2W390MHD diameter is 12.50 mm compared to 10.00 mm for the UCS2W390MND9. This 2.50 mm increase requires verification that the component footprint and surrounding circuit elements do not create clearance conflicts on the PCB.

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