Equivalent & Substitute Parts for UCS2G680MHD

Part Overview

The UCS2G680MHD is a 68 µF, 400 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 requiring reliable energy storage and filtering in power supply circuits. The part is currently active in production with full RoHS3 compliance.

Substitute parts are identified to address inventory availability, extended operational lifetime requirements, or enhanced voltage ratings while maintaining electrical and mechanical compatibility within the specified parameter tolerances.

Key Parameters

Parameter	Value	Unit
Capacitance	68	µF
Voltage - Rated	400	V
Tolerance	±20%	-
Operating Temperature Range	-40°C to 105°C	-
Polarization	Polar	-
Lead Spacing	7.50	mm
Package / Case	Radial, Can	-
Mounting Type	Through Hole	-

Substitute Part Grouping Explanation

Substitute parts for the UCS2G680MHD are classified based on the following substitution criteria:

Direct Equivalent (Same Electrical Rating):

UCY2G680MHD3 (Nichicon): Maintains identical capacitance (68 µF), voltage rating (400 V), tolerance (±20%), lead spacing (7.50 mm), and package type (Radial, Can). Extended lifetime of 12000 hours at 105°C compared to the original 10000 hours.

Upgrade Equivalent (Enhanced Voltage Rating):

450BXW68MEFR18X25 (Rubycon): Maintains identical capacitance (68 µF), tolerance (±20%), lead spacing (7.50 mm), and package type (Radial, Can). Rated voltage increased to 450 V with extended lifetime of 12000 hours at 105°C. Physical height increased by 0.5 mm (27.00 mm vs. 26.50 mm).

All substitute parts share the same polarization (Polar), operating temperature range (-40°C to 105°C), mounting type (Through Hole), and RoHS3 compliance status.

Parameter Comparison

Parameter	UCS2G680MHD	UCY2G680MHD3	450BXW68MEFR18X25
Manufacturer	Nichicon	Nichicon	Rubycon
Series	UCS	UCY	BXW
Capacitance	68 µF	68 µF	68 µF
Voltage - Rated	400 V	400 V	450 V
Tolerance	±20%	±20%	±20%
Lifetime @ Temp.	10000 Hrs @ 105°C	12000 Hrs @ 105°C	12000 Hrs @ 105°C
Operating Temperature	-40°C ~ 105°C	-40°C ~ 105°C	-40°C ~ 105°C
Polarization	Polar	Polar	Polar
Ripple Current @ 120 Hz	735 mA	735 mA	610 mA
Ripple Current @ 100 kHz	1.47 A	1.47 A	1.525 A
Lead Spacing	7.50 mm	7.50 mm	7.50 mm
Size / Dimension	18.00 mm Dia	18.00 mm Dia	18.00 mm Dia
Height - Seated (Max)	26.50 mm	26.50 mm	27.00 mm
Package / Case	Radial, Can	Radial, Can	Radial, Can
Mounting Type	Through Hole	Through Hole	Through Hole
RoHS Status	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant
Product Status	Active	Active	Active

Engineering Selection Recommendations

UCY2G680MHD3 Selection Criteria: This Nichicon direct equivalent is suitable for applications requiring identical electrical specifications with extended operational lifetime. The 12000-hour rating at 105°C provides improved reliability margin over the original 10000-hour specification. Both parts maintain identical voltage, capacitance, and physical footprint compatibility. Selection is appropriate when inventory of the original UCS2G680MHD is unavailable and extended component life is beneficial.

450BXW68MEFR18X25 Selection Criteria: This Rubycon upgrade equivalent is suitable for applications where enhanced voltage margin is required or where the circuit design permits higher voltage-rated components. The 450 V rating provides 50 V additional headroom above the original 400 V specification. The 0.5 mm height increase must be verified against PCB layout constraints and enclosure clearances. Extended 12000-hour lifetime at 105°C is maintained. Selection is appropriate when circuit conditions allow higher voltage operation and improved reliability margin is desired.

All substitute parts maintain RoHS3 compliance and active product status, ensuring long-term availability and regulatory compliance.

Frequently Asked Questions (FAQ)

Q: Can UCY2G680MHD3 be used as a direct replacement for UCS2G680MHD? A: Yes. Both parts share identical capacitance (68 µF), voltage rating (400 V), tolerance (±20%), lead spacing (7.50 mm), and package configuration (Radial, Can). The UCY2G680MHD3 provides extended lifetime (12000 hours vs. 10000 hours at 105°C) with no electrical or mechanical compatibility issues.

Q: What are the physical constraints when substituting 450BXW68MEFR18X25? A: The Rubycon part is 0.5 mm taller (27.00 mm vs. 26.50 mm seated height). Lead spacing and diameter remain identical at 7.50 mm and 18.00 mm respectively. PCB layout and enclosure clearance must accommodate the increased height.

Q: Are all substitute parts RoHS3 compliant? A: Yes. UCS2G680MHD, UCY2G680MHD3, and 450BXW68MEFR18X25 are all RoHS3 compliant.

Q: What is the voltage derating consideration for 450BXW68MEFR18X25? A: The 450BXW68MEFR18X25 is rated for 450 V, which is 50 V higher than the original 400 V specification. This part can be used in circuits designed for 400 V operation, providing additional voltage margin. No derating is required for 400 V applications.

Q: Do ripple current specifications differ between substitutes? A: Yes. At 120 Hz, UCS2G680MHD and UCY2G680MHD3 both handle 735 mA, while 450BXW68MEFR18X25 handles 610 mA. At 100 kHz, UCS2G680MHD and UCY2G680MHD3 handle 1.47 A, while 450BXW68MEFR18X25 handles 1.525 A. Circuit ripple current requirements must be verified against the selected substitute.

Q: Are there REACH compliance differences? A: UCS2G680MHD and 450BXW68MEFR18X25 are REACH Unaffected. UCY2G680MHD3 is REACH Affected. Regulatory requirements for the application must be confirmed.

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