RFS-100V221MK9#5 Equivalent & Substitute Parts

Part Overview

The RFS-100V221MK9#5 is a 220 µF, 100 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 with a ripple current capability of 930 mA at 120 Hz.

The RFS-100V221MK9#5 has reached obsolete product status. Identifying equivalent and substitute parts is necessary to maintain design continuity, ensure supply chain availability, and support ongoing production or repair requirements for legacy systems utilizing this capacitor.

Key Parameters

Parameter	Value
Capacitance	220 µF
Voltage Rating	100 V
Tolerance	±20%
Lifetime @ Temperature	1000 Hrs @ 85°C
Operating Temperature Range	-40°C ~ 85°C
Ripple Current @ 120 Hz	930 mA
Lead Spacing	0.295" (7.50 mm)
Package Diameter	0.709" (18.00 mm)
Package Height	1.575" (40.00 mm)
Mounting Type	Through Hole
Polarization	Polar
RoHS Status	ROHS3 Compliant

Substitute Part Grouping Explanation

Substitute parts for the RFS-100V221MK9#5 are classified based on the following substitution criteria:

Upgrade Substitutes: Parts that maintain or exceed the electrical specifications of the original component while offering improved performance characteristics. These parts retain the same capacitance (220 µF) and tolerance (±20%), but may feature higher voltage ratings, extended lifetime ratings, or improved ripple current handling.

Similar Substitutes: Parts that match the core electrical specifications (capacitance, voltage rating, tolerance) and physical form factor but may differ in mechanical dimensions, lifetime ratings, or ripple current performance. These parts are suitable for direct replacement in applications where the original specifications are met.

The key parameters determining substitution eligibility are:

Capacitance: 220 µF (fixed requirement)
Voltage Rating: 100 V minimum (equal or higher acceptable)
Tolerance: ±20% (fixed requirement)
Polarization: Polar (fixed requirement)
Package Type: Radial, Can (fixed requirement)
Mounting Type: Through Hole (fixed requirement)
Operating Temperature Range: -40°C ~ 85°C minimum (equal or wider acceptable)

Parameter Comparison

Parameter	RFS-100V221MK9#5 (Main)	UPW2D221MHD (Upgrade)	UFW2A221MHD (Similar)	UKW2A221MHD (Similar)
Manufacturer	Elna America	Nichicon	Nichicon	Nichicon
Series	RFS SILMIC II	UPW	UFW	UKW
Capacitance	220 µF	220 µF	220 µF	220 µF
Voltage Rating	100 V	200 V	100 V	100 V
Tolerance	±20%	±20%	±20%	±20%
Lifetime @ Temperature	1000 Hrs @ 85°C	8000 Hrs @ 105°C	2000 Hrs @ 85°C	2000 Hrs @ 85°C
Operating Temperature	-40°C ~ 85°C	-40°C ~ 105°C	-40°C ~ 85°C	-40°C ~ 85°C
Ripple Current @ 120 Hz	930 mA	515 mA	600 mA	600 mA
Lead Spacing	0.295" (7.50 mm)	0.295" (7.50 mm)	0.197" (5.00 mm)	0.197" (5.00 mm)
Package Diameter	0.709" (18.00 mm)	0.709" (18.00 mm)	0.492" (12.50 mm)	0.492" (12.50 mm)
Package Height	1.575" (40.00 mm)	1.575" (40.00 mm)	0.984" (25.00 mm)	0.984" (25.00 mm)
Product Status	Obsolete	Obsolete	Not For New Designs	Not For New Designs
RoHS Status	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant

Engineering Selection Recommendations

UPW2D221MHD (Upgrade Substitute): This Nichicon part maintains identical physical dimensions (0.709" diameter, 1.575" height, 0.295" lead spacing) and electrical capacitance (220 µF, ±20% tolerance) as the RFS-100V221MK9#5. The UPW2D221MHD features a doubled voltage rating (200 V versus 100 V) and significantly extended lifetime (8000 hours at 105°C versus 1000 hours at 85°C). The operating temperature range extends to 105°C. This part is suitable for direct PCB replacement where the original footprint and mounting holes are preserved. The higher voltage rating provides additional design margin in applications operating at or near the 100 V specification. Both parts are ROHS3 compliant and carry identical HTSUS and ECCN classifications.

UFW2A221MHD and UKW2A221MHD (Similar Substitutes): Both Nichicon parts match the core electrical specifications of the RFS-100V221MK9#5 (220 µF, 100 V, ±20% tolerance, 2000 hours at 85°C). However, these parts feature reduced physical dimensions (0.492" diameter, 0.984" height, 0.197" lead spacing). These substitutes are suitable only for applications where the smaller package footprint is acceptable and PCB layout modifications are feasible. The reduced ripple current rating (600 mA at 120 Hz versus 930 mA) must be evaluated against circuit requirements. Both parts are ROHS3 compliant.

Selection Criteria: For direct replacement without PCB modification, select UPW2D221MHD. For applications requiring the original form factor with equivalent electrical performance, UFW2A221MHD or UKW2A221MHD are acceptable if the reduced ripple current capacity does not exceed circuit demands.

Frequently Asked Questions (FAQ)

Q: Can UPW2D221MHD be used as a direct replacement for RFS-100V221MK9#5?

A: Yes. The UPW2D221MHD maintains identical physical dimensions, lead spacing, and mounting type. The part can be installed in the same PCB footprint without modification. The higher voltage rating (200 V) and extended lifetime (8000 hours at 105°C) provide enhanced performance margins.

Q: What is the difference between the upgrade substitute and similar substitutes?

A: The UPW2D221MHD upgrade substitute retains the original package size (0.709" diameter, 1.575" height) and lead spacing (0.295"), enabling direct PCB replacement. The UFW2A221MHD and UKW2A221MHD similar substitutes feature smaller packages (0.492" diameter, 0.984" height, 0.197" lead spacing) and require PCB layout evaluation before implementation.

Q: Are all substitute parts RoHS3 compliant?

A: Yes. The RFS-100V221MK9#5 and all listed substitute parts (UPW2D221MHD, UFW2A221MHD, UKW2A221MHD) are ROHS3 compliant and carry identical REACH unaffected status.

Q: Does the higher voltage rating of UPW2D221MHD affect circuit operation?

A: No. A capacitor with a higher voltage rating operates normally at lower voltages. The 200 V rating of UPW2D221MHD is compatible with 100 V circuit applications and provides additional safety margin.

Q: What is the impact of reduced ripple current in UFW2A221MHD and UKW2A221MHD?

A: The ripple current rating (600 mA at 120 Hz) is lower than the original part (930 mA at 120 Hz). Applications requiring ripple current handling above 600 mA at 120 Hz must retain the UPW2D221MHD or original RFS-100V221MK9#5. Audio applications typically operate within the 600 mA specification.

Q: Can UFW2A221MHD or UKW2A221MHD be used without PCB modification?

A: No. These parts feature different lead spacing (0.197" versus 0.295") and package dimensions. PCB layout modification is required for installation. Verify that the smaller footprint is compatible with available board space and component placement constraints.

Q: What is the product status of each substitute part?

A: UPW2D221MHD is obsolete. UFW2A221MHD and UKW2A221MHD are not for new designs. All parts remain available in current inventory for legacy system support and repair applications.

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