RFS-6V331MH4#5 Equivalent & Substitute Parts

Part Overview

The RFS-6V331MH4#5 is a 330 µF, 6.3 V aluminum electrolytic capacitor in radial, can package manufactured by Elna America. This component is rated for 1000 hours at 85°C and is designed for audio applications. The part is classified as obsolete, making equivalent and substitute parts necessary for ongoing design support, maintenance, and production continuity.

Key Parameters

Parameter	Value
Capacitance	330 µF
Voltage Rating	6.3 V
Tolerance	±20%
Lifetime @ Temperature	1000 Hrs @ 85°C
Operating Temperature Range	-40°C ~ 85°C
Polarization	Polar
Lead Spacing	0.197" (5.00mm)
Size / Dimension	0.394" Dia (10.00mm)
Height - Seated (Max)	0.630" (16.00mm)
Mounting Type	Through Hole
Package / Case	Radial, Can
RoHS Status	ROHS3 Compliant
Application	Audio
Ripple Current @ 120 Hz	290 mA

Substitute Part Grouping Explanation

Substitution of the RFS-6V331MH4#5 is determined by the following critical parameters:

Mandatory Matching Parameters:

Capacitance: 330 µF (exact match required)
Tolerance: ±20% (exact match required)
Polarization: Polar (exact match required)
Mounting Type: Through Hole (exact match required)
Package / Case: Radial, Can (exact match required)
Lead Spacing: 0.197" (5.00mm) (exact match required)
Size / Dimension: 0.394" Dia (10.00mm) (exact match required)

Allowable Variation Parameters:

Voltage Rating: May be equal to or greater than 6.3 V
Operating Temperature Range: May be equal to or wider than -40°C ~ 85°C
Lifetime @ Temperature: May be equal to or greater than 1000 Hrs @ 85°C
Ripple Current: May be equal to or greater than 290 mA @ 120 Hz

Substitute parts are categorized as Upgrade (higher voltage rating) or Similar (same or comparable voltage with enhanced performance characteristics).

Parameter Comparison

Part Number	Manufacturer	Capacitance	Voltage	Tolerance	Lifetime @ Temp	Operating Temp Range	Lead Spacing	Size Dia	Height Max	Ripple Current @ 120 Hz	Product Status
RFS-6V331MH4#5	Elna America	330 µF	6.3 V	±20%	1000 Hrs @ 85°C	-40°C ~ 85°C	0.197" (5.00mm)	0.394" (10.00mm)	0.630" (16.00mm)	290 mA	Obsolete
UFW1H331MPD	Nichicon	330 µF	50 V	±20%	2000 Hrs @ 85°C	-40°C ~ 85°C	0.197" (5.00mm)	0.394" (10.00mm)	0.630" (16.00mm)	570 mA	Not For New Designs
UKT1H331MPD	Nichicon	330 µF	50 V	±20%	1000 Hrs @ 105°C	-55°C ~ 105°C	0.197" (5.00mm)	0.394" (10.00mm)	0.630" (16.00mm)	410 mA	Not For New Designs
UKW1H331MPD	Nichicon	330 µF	50 V	±20%	2000 Hrs @ 85°C	-40°C ~ 85°C	0.197" (5.00mm)	0.394" (10.00mm)	0.630" (16.00mm)	570 mA	Not For New Designs
EEU-EB1V331	Panasonic Electronic Components	330 µF	35 V	±20%	10000 Hrs @ 105°C	-40°C ~ 105°C	0.197" (5.00mm)	0.394" (10.00mm)	0.669" (17.00mm)	278 mA	Active
EEU-FC1V331	Panasonic Electronic Components	330 µF	35 V	±20%	3000 Hrs @ 105°C	-55°C ~ 105°C	0.197" (5.00mm)	0.394" (10.00mm)	0.630" (16.00mm)	682.5 mA	Active
EKZE350ELL331MJ16S	Chemi-Con	330 µF	35 V	±20%	4000 Hrs @ 105°C	-40°C ~ 105°C	0.197" (5.00mm)	0.394" (10.00mm)	0.689" (17.50mm)	715 mA	Active
UFW0J331MED	Nichicon	330 µF	6.3 V	±20%	2000 Hrs @ 85°C	-40°C ~ 85°C	0.098" (2.50mm)	0.248" (6.30mm)	0.433" (11.00mm)	265 mA	Obsolete
UHE1V331MPD	Nichicon	330 µF	35 V	±20%	7000 Hrs @ 105°C	-40°C ~ 105°C	0.197" (5.00mm)	0.394" (10.00mm)	0.630" (16.00mm)	847 mA	Not For New Designs
UPJ1E331MPD6	Nichicon	330 µF	25 V	±20%	5000 Hrs @ 105°C	-55°C ~ 105°C	0.197" (5.00mm)	0.394" (10.00mm)	0.650" (16.50mm)	575 mA	Not For New Designs
UPW1V331MPD	Nichicon	330 µF	35 V	±20%	5000 Hrs @ 105°C	-55°C ~ 105°C	0.197" (5.00mm)	0.394" (10.00mm)	0.630" (16.00mm)	682.5 mA	Not For New Designs

Engineering Selection Recommendations

Upgrade Substitutes (Higher Voltage Rating):

The UFW1H331MPD, UKT1H331MPD, and UKW1H331MPD are Nichicon parts rated at 50 V, providing voltage margin above the original 6.3 V specification. These parts maintain identical physical dimensions (0.394" diameter, 0.630" height, 5.00mm lead spacing) and capacitance (330 µF ±20%). UFW1H331MPD and UKW1H331MPD both offer 2000 hours lifetime at 85°C, exceeding the original 1000 hours. UKT1H331MPD extends the operating temperature range to -55°C ~ 105°C and provides 1000 hours at 105°C. All three are ROHS3 compliant. These parts are classified as "Not For New Designs" but remain suitable for replacement and maintenance applications.

Similar Substitutes (Active Status, Enhanced Performance):

EEU-EB1V331 (Panasonic) and EEU-FC1V331 (Panasonic) are active products rated at 35 V with identical lead spacing and diameter. EEU-EB1V331 offers 10000 hours at 105°C with -40°C ~ 105°C operating range. EEU-FC1V331 includes AEC-Q200 automotive qualification, 3000 hours at 105°C, and -55°C ~ 105°C operating range. Height is 0.630" (matching original) for EEU-FC1V331 and 0.669" for EEU-EB1V331. Both are ROHS3 compliant.

EKZE350ELL331MJ16S (Chemi-Con) is an active product rated at 35 V with 4000 hours at 105°C, -40°C ~ 105°C operating range, and identical lead spacing and diameter. Height is 0.689", slightly exceeding the original 0.630". ROHS3 compliant.

UHE1V331MPD (Nichicon) is rated at 35 V with 7000 hours at 105°C and -40°C ~ 105°C operating range. Physical dimensions match the original exactly. Classified as "Not For New Designs" but ROHS3 compliant.

UPJ1E331MPD6 (Nichicon) is rated at 25 V with 5000 hours at 105°C and -55°C ~ 105°C operating range. Physical dimensions match the original exactly. Classified as "Not For New Designs" but ROHS3 compliant.

UPW1V331MPD (Nichicon) is rated at 35 V with 5000 hours at 105°C and -55°C ~ 105°C operating range. Physical dimensions match the original exactly. Classified as "Not For New Designs" but ROHS3 compliant. Highest inventory availability (1,000,400 pcs).

Physical Dimension Constraint:

UFW0J331MED (Nichicon) has identical voltage (6.3 V) and capacitance (330 µF) but differs in physical dimensions: 0.248" diameter (vs. 0.394"), 0.433" height (vs. 0.630"), and 0.098" lead spacing (vs. 0.197"). This part is not suitable for direct replacement in applications requiring the original footprint.

Frequently Asked Questions (FAQ)

Q: Can I use a higher voltage-rated capacitor as a substitute for the RFS-6V331MH4#5?

A: Yes. A capacitor rated at 25 V, 35 V, or 50 V can replace a 6.3 V capacitor in the same circuit, provided all other parameters match (capacitance, tolerance, physical dimensions, lead spacing, and mounting type). Higher voltage ratings provide additional safety margin and do not negatively affect circuit performance.

Q: What is the significance of the "Not For New Designs" product status?

A: "Not For New Designs" indicates the manufacturer no longer recommends these parts for new product development but continues to support existing applications. These parts remain suitable for maintenance, repair, and replacement of existing equipment. For new designs, prioritize parts with "Active" status such as EEU-EB1V331, EEU-FC1V331, or EKZE350ELL331MJ16S.

Q: Are all substitute parts physically interchangeable with the original RFS-6V331MH4#5?

A: Most substitutes maintain the original dimensions (0.394" diameter, 0.630" height, 5.00mm lead spacing). However, EEU-EB1V331 has a height of 0.669" and EKZE350ELL331MJ16S has a height of 0.689", which may require PCB layout verification. UFW0J331MED has significantly different dimensions and is not interchangeable. Always verify physical dimensions against your PCB layout before selection.

Q: Which substitute offers the best long-term reliability?

A: EEU-EB1V331 (Panasonic) provides the highest lifetime rating at 10000 hours at 105°C with active product status and ROHS3 compliance. UHE1V331MPD (Nichicon) offers 7000 hours at 105°C. Both exceed the original 1000 hours at 85°C specification significantly.

Q: Can I use UFW0J331MED as a substitute?

A: UFW0J331MED matches the voltage (6.3 V) and capacitance (330 µF) of the original part but has different physical dimensions (0.248" diameter vs. 0.394", 0.433" height vs. 0.630", 0.098" lead spacing vs. 0.197"). It is not suitable for direct PCB replacement unless your layout accommodates the smaller footprint.

Q: What is the difference between the Nichicon upgrade substitutes (UFW1H331MPD, UKT1H331MPD, UKW1H331MPD)?

A: All three are 330 µF, 50 V Nichicon parts with identical physical dimensions. UFW1H331MPD and UKW1H331MPD both provide 2000 hours at 85°C with -40°C ~ 85°C operating range. UKT1H331MPD provides 1000 hours at 105°C with extended -55°C ~ 105°C operating range, making it suitable for higher-temperature applications. UFW1H331MPD and UKW1H331MPD offer higher ripple current ratings (570 mA @ 120 Hz vs. 410 mA).

Q: Are all substitute parts RoHS3 compliant?

A: Yes. All substitute parts listed are ROHS3 compliant, matching the compliance status of the original RFS-6V331MH4#5.

Q: Which substitute has the highest inventory availability?

A: UPW1V331MPD (Nichicon) has the highest inventory at 1,000,400 pieces in stock. This part is rated at 35 V with 5000 hours at 105°C and maintains identical physical dimensions to the original.

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