Equivalent & Substitute Parts for RFS-50V331MJ7#5

Part Overview

The RFS-50V331MJ7#5 is a 330 µF, 50 V aluminum electrolytic capacitor in radial configuration 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 new production requirements.

Key Parameters

Parameter	Value
Capacitance	330 µF
Voltage Rating	50 V
Tolerance	±20%
Lifetime @ Temperature	1000 Hrs @ 85°C
Operating Temperature Range	-40°C ~ 85°C
Polarization	Polar
Lead Spacing	0.295" (7.50 mm)
Package Type	Radial, Can
Mounting Type	Through Hole
RoHS Status	ROHS3 Compliant

Substitute Part Grouping Explanation

Substitution for the RFS-50V331MJ7#5 is determined by the following criteria:

Upgrade Substitutes meet or exceed all electrical parameters while maintaining mechanical compatibility. These parts feature higher voltage ratings (100 V) and extended lifetime ratings (5000 Hrs @ 105°C), providing enhanced performance margins for the same 330 µF capacitance and identical physical dimensions.

Similar Substitutes maintain identical electrical specifications (330 µF, 50 V, ±20% tolerance) but differ in physical dimensions, lead spacing, or lifetime ratings. These parts are interchangeable only when board layout permits alternative package sizes.

Parametric Equivalents match the core electrical parameters and physical footprint of the main part but originate from different manufacturers. These provide direct form-fit-function replacement.

Substitution logic is based on:

Capacitance value (330 µF)
Voltage rating (50 V minimum for direct substitution; 100 V for upgraded performance)
Tolerance (±20%)
Polarization (Polar)
Lead spacing and physical dimensions (0.295" / 7.50 mm for direct fit)
Package type (Radial, Can)
Mounting type (Through Hole)

Parameter Comparison

Part Number	Manufacturer	Capacitance	Voltage	Tolerance	Lifetime @ Temp	Lead Spacing	Size / Dimension	Height (Max)	Product Status
RFS-50V331MJ7#5	Elna America	330 µF	50 V	±20%	1000 Hrs @ 85°C	0.295" (7.50 mm)	0.630" Dia (16.00 mm)	1.240" (31.50 mm)	Obsolete
EEU-FC2A331	Panasonic Electronic Components	330 µF	100 V	±20%	5000 Hrs @ 105°C	0.295" (7.50 mm)	0.630" Dia (16.00 mm)	1.240" (31.50 mm)	Active
ELXV101ELL331ML30S	Chemi-Con	330 µF	100 V	±20%	5000 Hrs @ 105°C	0.295" (7.50 mm)	0.630" Dia (16.00 mm)	1.240" (31.50 mm)	Active
UFG1H331MHM	Nichicon	330 µF	50 V	±20%	1000 Hrs @ 85°C	0.197" (5.00 mm)	0.492" Dia (12.50 mm)	0.866" (22.00 mm)	Obsolete
UFW1H331MPD	Nichicon	330 µF	50 V	±20%	2000 Hrs @ 85°C	0.197" (5.00 mm)	0.394" Dia (10.00 mm)	0.630" (16.00 mm)	Not For New Designs
UKW1H331MPD	Nichicon	330 µF	50 V	±20%	2000 Hrs @ 85°C	0.197" (5.00 mm)	0.394" Dia (10.00 mm)	0.630" (16.00 mm)	Not For New Designs
UKZ1H331MHM	Nichicon	330 µF	50 V	±20%	1000 Hrs @ 85°C	0.295" (7.50 mm)	0.630" Dia (16.00 mm)	1.240" (31.50 mm)	Obsolete

Engineering Selection Recommendations

For Direct Replacement (Form-Fit-Function):

UKZ1H331MHM (Nichicon) provides parametric equivalence to RFS-50V331MJ7#5. Both parts share identical capacitance (330 µF), voltage rating (50 V), tolerance (±20%), lifetime (1000 Hrs @ 85°C), lead spacing (0.295" / 7.50 mm), and physical dimensions (0.630" Dia × 1.240" height). This part is classified as obsolete but maintains full compatibility with existing board designs.

For Performance Enhancement:

EEU-FC2A331 (Panasonic Electronic Components) and ELXV101ELL331ML30S (Chemi-Con) are upgrade substitutes. Both maintain identical physical footprint and lead spacing while providing doubled voltage rating (100 V) and quintupled lifetime (5000 Hrs @ 105°C). These parts are active products with AEC-Q200 automotive qualification. Selection between these two upgrades depends on availability and supply chain requirements, as both meet identical electrical and mechanical specifications.

For Space-Constrained Applications:

UFW1H331MPD and UKW1H331MPD (both Nichicon) offer reduced physical dimensions while maintaining 330 µF capacitance and 50 V rating. These parts feature extended lifetime (2000 Hrs @ 85°C) compared to the original specification. However, lead spacing is reduced to 0.197" (5.00 mm), requiring board layout modification. Both parts are classified as "Not For New Designs."

Compliance Considerations:

All listed parts are ROHS3 compliant and REACH unaffected. EEU-FC2A331 and ELXV101ELL331ML30S carry AEC-Q200 automotive qualification, suitable for automotive and mission-critical applications.

Frequently Asked Questions (FAQ)

Q: Can EEU-FC2A331 or ELXV101ELL331ML30S be used as direct replacements for RFS-50V331MJ7#5?

A: Yes. Both parts maintain identical lead spacing (0.295" / 7.50 mm) and physical dimensions (0.630" Dia × 1.240" height). The higher voltage rating (100 V vs. 50 V) and extended lifetime (5000 Hrs @ 105°C vs. 1000 Hrs @ 85°C) provide enhanced performance margins without requiring board layout changes.

Q: What is the difference between UKZ1H331MHM and RFS-50V331MJ7#5?

A: Both parts are parametric equivalents with identical electrical specifications (330 µF, 50 V, ±20%, 1000 Hrs @ 85°C) and physical dimensions. The primary difference is manufacturer: UKZ1H331MHM is manufactured by Nichicon, while RFS-50V331MJ7#5 is manufactured by Elna America. Both are classified as obsolete.

Q: Why do UFW1H331MPD and UKW1H331MPD have different lead spacing?

A: UFW1H331MPD and UKW1H331MPD are similar substitutes with reduced physical dimensions (0.394" Dia × 0.630" height) compared to the main part. The lead spacing is reduced to 0.197" (5.00 mm) to accommodate the smaller package. These parts require board layout modification and are not recommended for new designs.

Q: Are all substitute parts RoHS3 compliant?

A: Yes. All listed parts, including RFS-50V331MJ7#5, EEU-FC2A331, ELXV101ELL331ML30S, UFG1H331MHM, UFW1H331MPD, UKW1H331MPD, and UKZ1H331MHM, are ROHS3 compliant and REACH unaffected.

Q: Which substitute part is recommended for new designs?

A: EEU-FC2A331 (Panasonic) or ELXV101ELL331ML30S (Chemi-Con) are recommended for new designs. Both are active products with AEC-Q200 automotive qualification, extended lifetime ratings, and identical physical compatibility with the original part.

Q: Can UFG1H331MHM be used as a substitute?

A: UFG1H331MHM matches the electrical specifications (330 µF, 50 V, ±20%, 1000 Hrs @ 85°C) but has different physical dimensions and lead spacing (0.197" / 5.00 mm vs. 0.295" / 7.50 mm). Substitution requires board layout modification and is not recommended for direct replacement applications.

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