RFS-50V221MJ6#5 Equivalent & Substitute Parts

Part Overview

The RFS-50V221MJ6#5 is a 220 µF, 50 V aluminum electrolytic capacitor in radial, can package manufactured by Elna America. This component belongs to the RFS/SILMIC II series and is rated for 1000 hours of operation at 85°C. The part is currently listed as obsolete, necessitating evaluation of functionally equivalent or superior alternatives for ongoing production and maintenance applications. Substitute parts must maintain the same capacitance and tolerance specifications while accommodating variations in voltage rating, lifetime, temperature range, and ripple current characteristics.

Key Parameters

Parameter	Value
Capacitance	220 µF
Tolerance	±20%
Voltage - Rated	50 V
Lifetime @ Temperature	1000 Hrs @ 85°C
Operating Temperature Range	-40°C ~ 85°C
Polarization	Polar
Ripple Current @ 120 Hz	720 mA
Lead Spacing	0.295" (7.50mm)
Size / Dimension	0.630" Dia (16.00mm)
Height - Seated (Max)	0.984" (25.00mm)
Mounting Type	Through Hole
Package / Case	Radial, Can
RoHS Status	ROHS3 Compliant

Substitute Part Grouping Explanation

Substitute parts are classified into three categories based on compatibility with the RFS-50V221MJ6#5:

Upgrade Substitutes - Parts with identical capacitance (220 µF) and tolerance (±20%), rated at higher voltage (100 V) or superior lifetime characteristics. These accommodate designs requiring enhanced reliability or increased headroom for voltage transients. The lead spacing, mounting type, and footprint remain identical, enabling direct board-level replacement.

Similar Substitutes - Parts with identical capacitance and tolerance specifications but variations in voltage rating, footprint dimensions, or lead spacing. These require mechanical compatibility verification prior to implementation.

Parametric Equivalents - Parts meeting exact electrical specifications for capacitance, tolerance, and voltage rating with matching package dimensions and lead spacing. These function as direct replacements without design modification.

Key parameters determining substitutability: capacitance (220 µF fixed), tolerance (±20% fixed), voltage rating (minimum 50 V), lead spacing (7.50mm preferred for direct replacement), overall dimensions (0.630" diameter and 0.984" height preferred for direct replacement), and mounting type (Through Hole fixed).

Parameter Comparison

Parameter	RFS-50V221MJ6#5	EEU-FC2A221	UPW2A221MHD	EKXG161ELL221ML25S	UFG1H221MHM	UFW1H221MPD	UKZ1H221MHM
Manufacturer	Elna America	Panasonic Electronic Components	Nichicon	Chemi-Con	Nichicon	Nichicon	Nichicon
Capacitance	220 µF	220 µF	220 µF	220 µF	220 µF	220 µF	220 µF
Tolerance	±20%	±20%	±20%	±20%	±20%	±20%	±20%
Voltage - Rated	50 V	100 V	100 V	160 V	50 V	50 V	50 V
Lifetime @ Temperature	1000 Hrs @ 85°C	5000 Hrs @ 105°C	8000 Hrs @ 105°C	10000 Hrs @ 105°C	1000 Hrs @ 85°C	2000 Hrs @ 85°C	1000 Hrs @ 85°C
Operating Temperature	-40°C ~ 85°C	-55°C ~ 105°C	-55°C ~ 105°C	-40°C ~ 105°C	-40°C ~ 85°C	-40°C ~ 85°C	-40°C ~ 85°C
Ripple Current @ 120 Hz	720 mA	760.5 mA	578.5 mA	1.02 A	390 mA	410 mA	Not specified
Lead Spacing	0.295" (7.50mm)	0.295" (7.50mm)	0.295" (7.50mm)	0.295" (7.50mm)	0.197" (5.00mm)	0.197" (5.00mm)	0.295" (7.50mm)
Size / Dimension	0.630" Dia (16.00mm)	0.630" Dia (16.00mm)	0.630" Dia (16.00mm)	0.630" Dia (16.00mm)	0.492" Dia (12.50mm)	0.394" Dia (10.00mm)	0.630" Dia (16.00mm)
Height - Seated (Max)	0.984" (25.00mm)	0.984" (25.00mm)	0.984" (25.00mm)	0.984" (25.00mm)	0.866" (22.00mm)	0.492" (12.50mm)	0.984" (25.00mm)
Mounting Type	Through Hole	Through Hole	Through Hole	Through Hole	Through Hole	Through Hole	Through Hole
Product Status	Obsolete	Active	Not For New Designs	Active	Obsolete	Not For New Designs	Obsolete
RoHS Status	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant

Engineering Selection Recommendations

Primary Recommendation: EEU-FC2A221

The Panasonic EEU-FC2A221 is the preferred upgrade substitute. It maintains identical capacitance (220 µF), tolerance (±20%), and package footprint while providing higher voltage rating (100 V) and superior operational life (5000 hours @ 105°C). The component is currently in active product status, ensuring ongoing availability and manufacturing support. RoHS3 compliance and AEC-Q200 automotive rating provide additional qualification pathways for regulated applications.

Secondary Recommendation: UPW2A221MHD

The Nichicon UPW2A221MHD serves as an alternative upgrade substitute with identical mechanical footprint and electrical performance comparable to EEU-FC2A221. Extended lifetime (8000 hours @ 105°C) and expanded operating temperature range (-55°C ~ 105°C) support applications requiring enhanced thermal margin. Product status is listed as "Not For New Designs," limiting this option to legacy system support or inventory drawdown scenarios.

Similar-Footprint Alternative: EKXG161ELL221ML25S

The Chemi-Con EKXG161ELL221ML25S offers the highest voltage rating (160 V) and longest operational life (10000 hours @ 105°C) with matching lead spacing and external dimensions. This part accommodates designs with stringent reliability requirements or vulnerability to voltage transients. Active product status supports long-term procurement continuity.

Direct Parametric Equivalents: UFG1H221MHM and UKZ1H221MHM

Both Nichicon UFG1H221MHM and UKZ1H221MHM match the original electrical specifications (50 V, 1000 hours @ 85°C) with identical lead spacing and external dimensions. Both components are listed as obsolete, limiting their use to exact replacement scenarios with existing inventory availability.

Compact Footprint Alternative: UFW1H221MPD

The Nichicon UFW1H221MPD provides 2000-hour lifetime at 85°C with reduced physical dimensions (0.394" diameter, 0.492" height) and narrower lead spacing (5.00mm). This option applies only to applications where PCB real estate constraints override footprint matching requirements.

Frequently Asked Questions (FAQ)

Q: Can EEU-FC2A221 directly replace the RFS-50V221MJ6#5 on existing PCBs without modification?

A: Yes. The EEU-FC2A221 maintains identical lead spacing (7.50mm), external diameter (16.00mm), and seated height (25.00mm), enabling direct through-hole board substitution. The higher voltage rating (100 V vs. 50 V) does not affect compatibility; the component will function correctly in circuits designed for 50 V operation.

Q: What is the advantage of selecting a higher voltage-rated substitute?

A: Higher voltage rating provides design margin against transient overvoltage events and thermal stress-related voltage variations. A 100 V or 160 V rated capacitor within a 50 V circuit maintains lower stress levels across the dielectric, potentially extending component operational life beyond nameplate specifications.

Q: Are parametric equivalents (UFG1H221MHM, UKZ1H221MHM) suitable for new designs?

A: Both parametric equivalents are classified as obsolete, making them unsuitable for new product development. These parts are only appropriate for legacy system maintenance using existing inventory. New designs should employ active-status alternatives such as EEU-FC2A221 or EKXG161ELL221ML25S.

Q: How does lead spacing affect part substitutability?

A: Lead spacing determines mechanical fit within through-hole PCB layouts. The RFS-50V221MJ6#5 uses 7.50mm lead spacing. Substitutes with identical spacing (EEU-FC2A221, UPW2A221MHD, EKXG161ELL221ML25S, UKZ1H221MHM) fit existing footprints without PCB modification. Parts with 5.00mm spacing (UFG1H221MHM, UFW1H221MPD) require PCB redesign or manual board rework.

Q: Which substitute offers the longest operational life?

A: The Chemi-Con EKXG161ELL221ML25S provides the highest operational life specification at 10000 hours @ 105°C, along with a 160 V voltage rating and matching 7.50mm lead spacing.

Q: What RoHS and compliance standards apply to these substitutes?

A: All listed substitute parts maintain RoHS3 compliance. The EEU-FC2A221 carries additional AEC-Q200 automotive qualification. REACH status is unaffected for all components. Verify compliance requirements within your regulatory framework prior to final component selection.

Q: Why are UFW1H221MPD and UFG1H221MHM listed as substitutes despite different physical dimensions?

A: These parts maintain electrical equivalence (220 µF, ±20%, 50 V) and through-hole mounting type but feature different physical footprints. They are suitable only for applications where PCB design allows dimensional variation or where space constraints require compact packaging.

Request Quote (Ships tomorrow)

Part Number

Quantity

Company

Contact Name

E-mail

Message