RFS-50V220MH3#5 Equivalent & Substitute Parts

Part Overview

The RFS-50V220MH3#5 is a 22 µF, 50 V aluminum electrolytic capacitor in radial, can package manufactured by Elna America as part of the RFS/SILMIC II series. This component is rated for 1000 hours at 85°C and is designed for audio applications. The part is classified as obsolete, making equivalent substitutes necessary for ongoing production, maintenance, and repair applications where this specific model is no longer available from the original manufacturer.

Substiute Parts

RFS-50V220MH3#5

Elna AmericaIn Stock: 1076RFS-50V220MH3#5 Datasheet

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UFW1H220MDD

NichiconIn Stock: 37882UFW1H220MDD Datasheet

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UKW1H220MDD

NichiconIn Stock: 2844UKW1H220MDD Datasheet

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Key Parameters

Substitute Part Grouping Explanation

Substitution for the RFS-50V220MH3#5 is determined by strict electrical and mechanical compatibility criteria. All substitute parts must meet the following requirements:

Electrical Parameters (Mandatory Match):

• Capacitance: 22 µF
• Voltage Rating: 50 V
• Tolerance: ±20%
• Polarization: Polar

Mechanical Parameters (Mandatory Match):

• Package Type: Radial, Can
• Mounting Type: Through Hole
• Operating Temperature Range: -40°C ~ 85°C

Compliance Parameters (Mandatory Match):

• RoHS3 Compliant
• REACH Unaffected

The substitute parts identified below satisfy all mandatory electrical, mechanical, and compliance criteria. Differences in lifetime rating, ripple current specifications, and physical dimensions are secondary considerations that do not prevent functional substitution when the primary parameters align.

Parameter Comparison

Engineering Selection Recommendations

Both UFW1H220MDD and UKW1H220MDD from Nichicon are valid electrical and mechanical substitutes for the RFS-50V220MH3#5. Selection between these options should be based on the following factors:

UFW1H220MDD (Nichicon):

• Identical height to the original part (0.492" / 12.50mm)
• Smaller physical footprint (5.00mm diameter vs. 10.00mm)
• Extended lifetime rating (2000 Hrs @ 85°C vs. 1000 Hrs)
• Lower ripple current at 120 Hz (95 mA vs. 130 mA)
• Smaller lead spacing (2.00mm vs. 5.00mm)
• Higher inventory availability (37,800 pcs)

UKW1H220MDD (Nichicon):

• Reduced height (0.433" / 11.00mm vs. 0.492")
• Smaller physical footprint (5.00mm diameter vs. 10.00mm)
• Extended lifetime rating (2000 Hrs @ 85°C vs. 1000 Hrs)
• Lower ripple current at 120 Hz (95 mA vs. 130 mA)
• Smaller lead spacing (2.00mm vs. 5.00mm)
• Lower inventory availability (2,801 pcs)

Both substitute parts maintain full compliance with ROHS3 and REACH requirements. The primary consideration for selection is PCB layout compatibility, specifically lead spacing and physical dimensions. The UFW1H220MDD offers superior availability and identical height, while the UKW1H220MDD provides a more compact profile with reduced height.

Frequently Asked Questions (FAQ)

Q: Can UFW1H220MDD or UKW1H220MDD be used as direct replacements for RFS-50V220MH3#5?

A: Both Nichicon parts are electrically and mechanically compatible substitutes. They share identical capacitance (22 µF), voltage rating (50 V), tolerance (±20%), polarization (Polar), package type (Radial, Can), mounting type (Through Hole), and operating temperature range (-40°C ~ 85°C). All three parts are ROHS3 compliant and REACH unaffected. However, physical dimensions differ, requiring PCB layout verification before implementation.

Q: What are the key differences between UFW1H220MDD and UKW1H220MDD?

A: The primary differences are physical dimensions and inventory availability. UFW1H220MDD has a maximum seated height of 0.492" (12.50mm), matching the original part, while UKW1H220MDD is shorter at 0.433" (11.00mm). Both have identical 5.00mm diameter and 2.00mm lead spacing. UFW1H220MDD has significantly higher inventory (37,800 pcs vs. 2,801 pcs). Electrical performance is identical between the two Nichicon parts.

Q: Will the smaller lead spacing (2.00mm vs. 5.00mm) affect PCB compatibility?

A: Yes. The original RFS-50V220MH3#5 has 5.00mm lead spacing, while both Nichicon substitutes have 2.00mm lead spacing. PCB through-hole pad spacing must be verified to accommodate the smaller lead spacing of the substitute parts. If the original PCB was designed for 5.00mm spacing, mechanical modification or PCB redesign may be required.

Q: Are the substitute parts available in the same packaging as the original?

A: The original RFS-50V220MH3#5 was packaged in bulk. UFW1H220MDD is also available in bulk packaging. Both substitute parts are new original stock from authorized distributors.

Q: How does the extended lifetime rating (2000 Hrs vs. 1000 Hrs) affect selection?

A: The substitute parts offer double the lifetime rating at 85°C. This represents an improvement over the original specification and does not create compatibility issues. Extended lifetime is a beneficial characteristic for long-term reliability in audio applications.

Q: What is the impact of different ripple current ratings?

A: The original part is rated for 130 mA ripple current at 120 Hz, while the substitutes are rated for 95 mA at 120 Hz. If the application requires ripple current handling above 95 mA at 120 Hz, the substitute parts may not be suitable. Circuit analysis is required to determine actual ripple current demands.