Equivalent & Substitute Parts for UCY2G390MHD9

Part Overview

The UCY2G390MHD9 is a 39 µF, 400 V aluminum electrolytic capacitor in radial, can package manufactured by Nichicon. This component is rated for 12000 hours at 105°C and is designed for general purpose applications. The part is currently active in production with 1751 units in stock. Equivalent and substitute parts are identified to support procurement flexibility, inventory management, and supply chain continuity.

Key Parameters

Parameter	Value
Capacitance	39 µF
Voltage Rating	400 V
Tolerance	±20%
Lifetime @ Temperature	12000 Hrs @ 105°C
Operating Temperature Range	-40°C ~ 105°C
Polarization	Polar
Mounting Type	Through Hole
Package Type	Radial, Can
Lead Spacing	0.197" (5.00mm)
Case Diameter	0.492" Dia (12.50mm)
RoHS Status	ROHS3 Compliant

Substitute Part Grouping Explanation

Substitution eligibility for the UCY2G390MHD9 is determined by strict equivalence across the following parameters:

Capacitance: 39 µF (exact match required)
Voltage Rating: 400 V (exact match required)
Tolerance: ±20% (exact match required)
Lifetime: 12000 Hrs @ 105°C (exact match required)
Operating Temperature: -40°C ~ 105°C (exact match required)
Polarization: Polar (exact match required)
Mounting Type: Through Hole (exact match required)
Package Type: Radial, Can (exact match required)
Lead Spacing: 0.197" (5.00mm) (exact match required)
Case Diameter: 0.492" Dia (12.50mm) (exact match required)

All identified substitute parts meet these criteria. Variations in ripple current ratings and maximum seated height within acceptable mechanical tolerances do not affect substitution eligibility.

Parameter Comparison

Parameter	UCY2G390MHD9 (Nichicon)	400BXW39MEFR12.5X25 (Rubycon)	EKXL401ELL390MK25S (Chemi-Con)	EKXJ401ELL390MK25S (Chemi-Con)
Capacitance	39 µF	39 µF	39 µF	39 µF
Voltage Rating	400 V	400 V	400 V	400 V
Tolerance	±20%	±20%	±20%	±20%
Lifetime @ 105°C	12000 Hrs	12000 Hrs	12000 Hrs	12000 Hrs
Operating Temperature	-40°C ~ 105°C	-40°C ~ 105°C	-40°C ~ 105°C	-40°C ~ 105°C
Polarization	Polar	Polar	Polar	Polar
Mounting Type	Through Hole	Through Hole	Through Hole	Through Hole
Package Type	Radial, Can	Radial, Can	Radial, Can	Radial, Can
Lead Spacing	0.197" (5.00mm)	0.197" (5.00mm)	0.197" (5.00mm)	0.197" (5.00mm)
Case Diameter	0.492" Dia (12.50mm)	0.492" Dia (12.50mm)	0.492" Dia (12.50mm)	0.492" Dia (12.50mm)
Height - Seated (Max)	1.043" (26.50mm)	1.063" (27.00mm)	1.063" (27.00mm)	1.043" (26.50mm)
Ripple Current @ 120 Hz	385 mA	390 mA	390 mA	390 mA
Ripple Current @ 100 kHz	770 mA	975 mA	975 mA	975 mA
RoHS Status	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant
Product Status	Active	Active	Active	Active
Applications	General Purpose	General Purpose	General Purpose	Automotive
Ratings	—	—	—	AEC-Q200

Engineering Selection Recommendations

All four parts are active in production and ROHS3 compliant. Selection between the main part and substitutes is based on application requirements and availability:

For general purpose applications without automotive qualification requirements, the UCY2G390MHD9 (Nichicon), 400BXW39MEFR12.5X25 (Rubycon), and EKXL401ELL390MK25S (Chemi-Con) are functionally equivalent.

For automotive applications requiring AEC-Q200 qualification, the EKXJ401ELL390MK25S (Chemi-Con) is the appropriate selection. This part carries automotive-grade certification and is suitable for use in automotive circuits and systems.

All parts are REACH affected or unaffected as specified, with EAR99 export classification and HTSUS code 8532.22.0020.

Frequently Asked Questions (FAQ)

Q: Can I substitute the UCY2G390MHD9 with any of the listed parts?

A: Yes. All listed parts meet the electrical and mechanical specifications required for direct substitution: 39 µF capacitance, 400 V voltage rating, ±20% tolerance, 12000 hour lifetime at 105°C, and identical through-hole radial can package dimensions with 5.00mm lead spacing.

Q: What is the difference between EKXL401ELL390MK25S and EKXJ401ELL390MK25S?

A: Both are Chemi-Con parts with identical electrical specifications. The EKXJ401ELL390MK25S carries AEC-Q200 automotive qualification and is rated for automotive applications. The EKXL401ELL390MK25S is rated for general purpose applications. Selection depends on application requirements.

Q: Are there height differences between these parts?

A: The UCY2G390MHD9 and EKXJ401ELL390MK25S have a maximum seated height of 1.043" (26.50mm). The 400BXW39MEFR12.5X25 and EKXL401ELL390MK25S have a maximum seated height of 1.063" (27.00mm). Both heights are within acceptable mechanical tolerances for through-hole radial can packages and do not affect substitution eligibility.

Q: Do ripple current ratings affect substitution?

A: Ripple current ratings are provided for design reference. The UCY2G390MHD9 specifies 385 mA at 120 Hz and 770 mA at 100 kHz. Substitute parts specify 390 mA at 120 Hz and 975 mA at 100 kHz. These variations do not affect substitution eligibility; circuit design must account for the specific ripple current rating of the selected part.

Q: What is the lead spacing for all parts?

A: All parts have 0.197" (5.00mm) lead spacing, ensuring compatibility with existing PCB layouts designed for the UCY2G390MHD9.

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