Equivalent & Substitute Parts for UAS2G121MHD

Part Overview

The UAS2G121MHD is a 120 µF, 400 V aluminum electrolytic capacitor in radial configuration manufactured by Nichicon. This component is designed for general-purpose applications requiring reliable energy storage and filtering in circuits operating at 400 V. The part is Active status and widely used in power supply circuits, industrial equipment, and general electronic applications. Substitute parts may be required due to inventory availability, application-specific performance requirements, or design optimization needs.

Substiute Parts

UAS2G121MHD

NichiconIn Stock: 1038UAS2G121MHD Datasheet

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450BXW120MEFR18X40

RubyconIn Stock: 2587450BXW120MEFR18X40 Datasheet

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Key Parameters

Substitute Part Grouping Explanation

Substitution of the UAS2G121MHD is based on the following critical parameters:

• Capacitance Value: 120 µF (exact match required)
• Voltage Rating: Minimum 400 V (equal or higher acceptable)
• Tolerance: ±20% (standard tolerance maintained)
• Physical Dimensions: Lead spacing 0.295" (7.50mm), diameter 0.709" (18.00mm), height 1.654" (42.00mm) maximum (PCB footprint compatibility)
• Mounting Type: Through Hole, Radial configuration (mechanical compatibility)
• Operating Temperature Range: -40°C ~ 105°C (functional range)
• Polarization: Polar (electrical polarity requirement)
• Compliance: ROHS3 Compliant, REACH Unaffected (regulatory requirements)

The substitute part 450BXW120MEFR18X40 meets all substitution criteria with identical capacitance, tolerance, physical dimensions, mounting type, and compliance certifications. The rated voltage is higher (450 V vs. 400 V), which is acceptable for direct substitution in applications designed for 400 V operation.

Parameter Comparison

Engineering Selection Recommendations

The 450BXW120MEFR18X40 (Rubycon BXW series) is a direct substitute for the UAS2G121MHD. Both components are Active status products with ROHS3 compliance and REACH unaffected status, meeting current regulatory requirements.

Selection between these parts should be based on:

• Voltage Margin: The 450BXW120MEFR18X40 provides 50 V additional voltage rating, suitable for applications requiring enhanced voltage headroom or operating in variable supply conditions.
• Thermal Lifetime: The Rubycon part offers 12000 Hrs @ 105°C compared to 2000 Hrs @ 105°C for the Nichicon part, indicating extended operational life in high-temperature environments.
• Ripple Current Handling: The 450BXW120MEFR18X40 supports higher ripple currents across frequency ranges, beneficial for high-current or switching applications.
• Physical Compatibility: Identical footprint and mounting configuration ensure direct PCB replacement without layout modifications.

Frequently Asked Questions (FAQ)

Q: Can the 450BXW120MEFR18X40 replace the UAS2G121MHD in a 400 V circuit?

A: Yes. The 450BXW120MEFR18X40 has a 450 V rating, which exceeds the 400 V requirement. Higher voltage-rated capacitors are suitable for lower-voltage applications.

Q: Are the physical dimensions identical?

A: Yes. Both parts have identical lead spacing (0.295" / 7.50mm), diameter (0.709" / 18.00mm), and maximum height (1.654" / 42.00mm). Direct PCB replacement is possible without layout changes.

Q: What is the difference in lifetime specifications?

A: The UAS2G121MHD is rated for 2000 Hrs @ 105°C, while the 450BXW120MEFR18X40 is rated for 12000 Hrs @ 105°C. The Rubycon part provides extended thermal life, beneficial for applications in elevated-temperature environments.

Q: Are both parts RoHS compliant?

A: Yes. Both the UAS2G121MHD and 450BXW120MEFR18X40 are ROHS3 Compliant and REACH Unaffected, meeting current environmental and regulatory standards.

Q: What is the capacitance tolerance for both parts?

A: Both parts have ±20% tolerance on the 120 µF capacitance value, ensuring consistent performance across the specified tolerance band.

Q: Can these parts be used interchangeably in all applications?

A: Yes, for applications designed for 400 V operation. The substitute part's higher voltage rating and extended thermal lifetime make it suitable for direct replacement in the same circuit configuration.