RFS-6V221MH3#5 Equivalent & Substitute Parts

Part Overview

The RFS-6V221MH3#5 is a 220 µF, 6.3 V aluminum electrolytic capacitor in radial, can package manufactured by Elna America. This component belongs to the SILMIC II series and is rated for 1000 hours at 85°C with a ±20% capacitance tolerance. The part is classified as obsolete, necessitating identification of equivalent and substitute components for ongoing maintenance, repair, and legacy system support. Substitute parts must maintain electrical compatibility while accommodating available alternatives from active product lines.

Key Parameters

Parameter	Value	Substitution Relevance
Capacitance	220 µF	Must match exactly
Voltage Rating	6.3 V	Substitute must equal or exceed
Tolerance	±20%	Must match or be tighter
Polarization	Polar	Must match
Package Type	Radial, Can	Must match for through-hole mounting
Lead Spacing	0.197" (5.00 mm)	Must match for PCB compatibility
Diameter	0.394" (10.00 mm)	Must match for mechanical fit
Height (Max)	0.492" (12.50 mm)	Substitute may exceed for space-constrained applications
Operating Temperature	-40°C to 85°C	Substitute range must encompass or exceed
Lifetime @ Temperature	1000 Hrs @ 85°C	Substitute should meet or exceed for reliability
Mounting Type	Through Hole	Must match
RoHS Status	ROHS3 Compliant	Substitute must maintain compliance

Substitute Part Grouping Explanation

Substitution logic for the RFS-6V221MH3#5 is based on the following criteria:

Primary Substitution Requirements:

Capacitance: 220 µF (exact match required)
Voltage Rating: Minimum 6.3 V (higher ratings acceptable for backward compatibility)
Tolerance: ±20% or tighter
Package: Radial, Can with 5.00 mm lead spacing and 10.00 mm diameter
Polarization: Polar (electrolytic)
Mounting: Through Hole

Secondary Compatibility Factors:

Operating temperature range must support -40°C to 85°C minimum
Physical dimensions (height) may vary within mechanical constraints
Lifetime rating should meet or exceed 1000 hours at 85°C for equivalent reliability
RoHS3 compliance required for regulatory alignment

Substitute Categories:

Upgrade Substitutes (Higher Voltage Rating): UFW1H221MPD, UFW1V221MPD, UKT1H221MPD, UKW1V221MPD. These parts maintain 220 µF capacitance and radial can package while offering higher voltage ratings (35 V or 50 V) and extended lifetime ratings (2000 hours at 85°C or 1000 hours at 105°C). Higher voltage ratings provide design margin and are electrically compatible in applications rated for 6.3 V.

Similar Substitutes (Equivalent Voltage or Extended Temperature Range): 517D227M035CC6AE3, EEU-FC1V221, EKZE350ELL221MJC5S, MAL215060221E3, SEK221M035ST, UHE1V221MPD6. These parts match 220 µF capacitance and 35 V voltage rating with identical or superior package dimensions. Extended operating temperature ranges (-55°C to 105°C) and longer lifetime ratings (2000 to 7000 hours at 105°C) provide enhanced performance margins.

Parameter Comparison

Part Number	Manufacturer	Capacitance	Voltage	Tolerance	Diameter	Height (Max)	Lead Spacing	Lifetime @ Temp	Operating Temp Range	Product Status
RFS-6V221MH3#5	Elna America	220 µF	6.3 V	±20%	0.394" (10.00 mm)	0.492" (12.50 mm)	0.197" (5.00 mm)	1000 Hrs @ 85°C	-40°C to 85°C	Obsolete
UFW1H221MPD	Nichicon	220 µF	50 V	±20%	0.394" (10.00 mm)	0.492" (12.50 mm)	0.197" (5.00 mm)	2000 Hrs @ 85°C	-40°C to 85°C	Not For New Designs
UFW1V221MPD	Nichicon	220 µF	35 V	±20%	0.394" (10.00 mm)	0.492" (12.50 mm)	0.197" (5.00 mm)	2000 Hrs @ 85°C	-40°C to 85°C	Not For New Designs
UKT1H221MPD	Nichicon	220 µF	50 V	±20%	0.394" (10.00 mm)	0.492" (12.50 mm)	0.197" (5.00 mm)	1000 Hrs @ 105°C	-55°C to 105°C	Not For New Designs
UKW1V221MPD	Nichicon	220 µF	35 V	±20%	0.394" (10.00 mm)	0.492" (12.50 mm)	0.197" (5.00 mm)	2000 Hrs @ 85°C	-40°C to 85°C	Not For New Designs
517D227M035CC6AE3	Vishay Sprague	220 µF	35 V	±20%	0.394" (10.00 mm)	0.492" (12.50 mm)	0.197" (5.00 mm)	2000 Hrs @ 105°C	-55°C to 105°C	Obsolete
EEU-FC1V221	Panasonic Electronic Components	220 µF	35 V	±20%	0.394" (10.00 mm)	0.492" (12.50 mm)	0.197" (5.00 mm)	3000 Hrs @ 105°C	-55°C to 105°C	Active
EKZE350ELL221MJC5S	Chemi-Con	220 µF	35 V	±20%	0.394" (10.00 mm)	0.551" (14.00 mm)	0.197" (5.00 mm)	4000 Hrs @ 105°C	-40°C to 105°C	Active
MAL215060221E3	Vishay Beyschlag/Draloric/BC Components	220 µF	35 V	±20%	0.394" (10.00 mm)	0.512" (13.00 mm)	0.197" (5.00 mm)	4000 Hrs @ 105°C	-55°C to 105°C	Active
SEK221M035ST	Mallory	220 µF	35 V	±20%	0.394" (10.00 mm)	0.591" (15.00 mm)	0.197" (5.00 mm)	2000 Hrs @ 105°C	-55°C to 105°C	Active
UHE1V221MPD6	Nichicon	220 µF	35 V	±20%	0.394" (10.00 mm)	0.492" (12.50 mm)	0.197" (5.00 mm)	7000 Hrs @ 105°C	-40°C to 105°C	Not For New Designs

Engineering Selection Recommendations

For Direct Replacement (Identical Footprint and Height):

UFW1V221MPD, UKW1V221MPD, and UHE1V221MPD6 maintain the exact physical dimensions of the RFS-6V221MH3#5 (0.492" maximum height). These parts are suitable for space-constrained applications where PCB layout cannot accommodate taller components. UFW1V221MPD and UKW1V221MPD are classified as "Not For New Designs" but remain available for legacy system support. UHE1V221MPD6 offers the longest lifetime rating (7000 hours at 105°C) among direct replacements, though REACH status is affected.

For Active Product Line Integration:

EEU-FC1V221 (Panasonic) and EKZE350ELL221MJC5S (Chemi-Con) are active products with extended lifetime ratings (3000 and 4000 hours at 105°C respectively). EEU-FC1V221 carries AEC-Q200 automotive qualification and maintains the original height specification. EKZE350ELL221MJC5S offers the highest lifetime rating (4000 hours at 105°C) with lower impedance (53 mOhms) but requires 1.4 mm additional height clearance (0.551" vs. 0.492").

For Automotive and High-Reliability Applications:

MAL215060221E3 (Vishay) and EEU-FC1V221 (Panasonic) both carry AEC-Q200 qualification and support extended operating temperature ranges (-55°C to 105°C). MAL215060221E3 provides 4000-hour lifetime at 105°C with AEC-Q200 rating. Both parts require minimal height accommodation (0.512" and 0.492" respectively).

For General Purpose and Cost-Optimized Applications:

SEK221M035ST (Mallory) is an active product with 2000-hour lifetime at 105°C and specified ESR of 840 mOhms at 120 Hz. This part requires 0.591" height clearance but provides documented impedance characteristics for ripple current calculations.

Voltage Rating Considerations:

All substitute parts rated at 35 V or higher are electrically compatible with the original 6.3 V specification. Higher voltage ratings provide design margin and improved reliability in applications subject to voltage transients or ripple current stress.

Frequently Asked Questions (FAQ)

Q: Can I use a 35 V rated capacitor in place of the 6.3 V RFS-6V221MH3#5?

A: Yes. Higher voltage-rated capacitors are electrically compatible in applications designed for lower voltages. The 35 V and 50 V substitutes provide additional design margin and are suitable for direct replacement provided the physical dimensions fit the PCB layout.

Q: What is the difference between "Upgrade" and "Similar" substitute categories?

A: Upgrade substitutes (UFW and UKT series) feature higher voltage ratings (35 V or 50 V) with extended lifetime ratings. Similar substitutes maintain the 35 V voltage rating with equivalent or superior lifetime characteristics. Both categories meet the core electrical requirements of 220 µF capacitance and ±20% tolerance.

Q: Which substitute offers the longest operational life?

A: UHE1V221MPD6 provides 7000 hours at 105°C, the highest lifetime rating among all substitutes. EKZE350ELL221MJC5S and MAL215060221E3 both offer 4000-hour ratings at 105°C. The original RFS-6V221MH3#5 is rated for 1000 hours at 85°C.

Q: Are there height restrictions I should consider?

A: The original part specifies 0.492" maximum height. UFW1V221MPD, UKW1V221MPD, UHE1V221MPD6, and EEU-FC1V221 maintain this height. EKZE350ELL221MJC5S (0.551"), MAL215060221E3 (0.512"), and SEK221M035ST (0.591") require additional clearance. Verify PCB layout constraints before selection.

Q: Which substitutes are suitable for new product designs?

A: EEU-FC1V221, EKZE350ELL221MJC5S, MAL215060221E3, and SEK221M035ST are classified as Active products and are appropriate for new designs. UFW, UKT, UKW, and UHE series are marked "Not For New Designs" and should be reserved for legacy system maintenance and repair.

Q: Do all substitutes maintain RoHS3 compliance?

A: Yes. All listed substitutes are RoHS3 compliant. The original RFS-6V221MH3#5 is also RoHS3 compliant. REACH status varies: most substitutes are REACH Unaffected; UHE1V221MPD6 is REACH Affected.

Q: What is the significance of lead spacing and diameter specifications?

A: Lead spacing (0.197" / 5.00 mm) and diameter (0.394" / 10.00 mm) are critical for PCB footprint compatibility. All listed substitutes maintain these dimensions, ensuring direct mechanical fit without PCB redesign. Verify actual component measurements before installation.

Q: Can I use UFW1H221MPD (50 V) instead of UFW1V221MPD (35 V)?

A: Yes. Both parts are electrically compatible with the original 6.3 V application. UFW1H221MPD provides higher voltage margin and identical physical dimensions. Selection depends on cost, availability, and design margin requirements.

Q: What does "Not For New Designs" mean for legacy parts?

A: This designation indicates the manufacturer has discontinued active support for new product development. These parts remain available for existing inventory and legacy system support but should not be specified for new designs. Active alternatives (EEU-FC1V221, EKZE350ELL221MJC5S, MAL215060221E3, SEK221M035ST) are recommended for new applications.

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