RFS-35V331MJ6#5 Equivalent & Substitute Parts

Part Overview

The RFS-35V331MJ6#5 is a 330 µF, 35 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 785 mA at 120 Hz.

The RFS-35V331MJ6#5 is classified as obsolete. Identifying equivalent and substitute parts is necessary to maintain design continuity, ensure supply chain availability, and support ongoing production or repair requirements for legacy audio equipment and systems.

Key Parameters

Parameter	Value
Capacitance	330 µF
Voltage - Rated	35 V
Tolerance	±20%
Lifetime @ Temperature	1000 Hrs @ 85°C
Operating Temperature Range	-40°C ~ 85°C
Ripple Current @ 120 Hz	785 mA
Lead Spacing	0.295" (7.50 mm)
Size / Dimension	0.630" Dia (16.00 mm)
Height - Seated (Max)	0.984" (25.00 mm)
Mounting Type	Through Hole
Package / Case	Radial, Can
Polarization	Polar
Application	Audio
RoHS Status	ROHS3 Compliant

Substitute Part Grouping Explanation

Substitution of the RFS-35V331MJ6#5 is determined by the following critical parameters:

Primary Substitution Criteria:

Capacitance: 330 µF (exact match required)
Voltage Rating: 35 V (minimum requirement; higher voltage ratings are acceptable)
Tolerance: ±20% (standard tolerance for audio applications)
Mounting Type: Through Hole (mechanical compatibility)
Package / Case: Radial, Can (form factor compatibility)
Polarization: Polar (functional requirement)

Secondary Compatibility Factors:

Operating Temperature Range: -40°C ~ 85°C (minimum requirement)
Lead Spacing and Physical Dimensions: Critical for PCB layout compatibility
Ripple Current Rating: Must support application requirements
Lifetime @ Temperature: Determines reliability in target application

Substitute parts are grouped into two categories:

Category A - Direct Substitutes (35 V Rating): UFG1V331MHM, UFW1V331MPD, and UKW1V331MPD maintain the 35 V voltage rating and 330 µF capacitance. These parts differ in physical dimensions, lead spacing, and lifetime ratings but remain functionally compatible for 35 V audio applications.

Category B - Higher Voltage Substitute (100 V Rating): UPW2A331MHD provides 330 µF capacitance at 100 V rating. This part is electrically compatible as a direct replacement due to voltage derating principles but is physically larger and designed for general-purpose applications rather than audio-specific use.

Parameter Comparison

Parameter	RFS-35V331MJ6#5	UFG1V331MHM	UFW1V331MPD	UKW1V331MPD	UPW2A331MHD
Manufacturer	Elna America	Nichicon	Nichicon	Nichicon	Nichicon
Series	RFS SILMIC II	UFG	UFW	UKW	UPW
Capacitance	330 µF	330 µF	330 µF	330 µF	330 µF
Voltage - Rated	35 V	35 V	35 V	35 V	100 V
Tolerance	±20%	±20%	±20%	±20%	±20%
Lifetime @ Temperature	1000 Hrs @ 85°C	1000 Hrs @ 85°C	2000 Hrs @ 85°C	2000 Hrs @ 85°C	8000 Hrs @ 105°C
Operating Temperature	-40°C ~ 85°C	-40°C ~ 85°C	-40°C ~ 85°C	-40°C ~ 85°C	-55°C ~ 105°C
Ripple Current @ 120 Hz	785 mA	446 mA	470 mA	470 mA	702 mA
Lead Spacing	0.295" (7.50 mm)	0.197" (5.00 mm)	0.197" (5.00 mm)	0.197" (5.00 mm)	0.295" (7.50 mm)
Size / Dimension	0.630" Dia (16.00 mm)	0.492" Dia (12.50 mm)	0.394" Dia (10.00 mm)	0.394" Dia (10.00 mm)	0.630" Dia (16.00 mm)
Height - Seated (Max)	0.984" (25.00 mm)	0.866" (22.00 mm)	0.492" (12.50 mm)	0.492" (12.50 mm)	0.984" (25.00 mm)
Mounting Type	Through Hole	Through Hole	Through Hole	Through Hole	Through Hole
Package / Case	Radial, Can	Radial, Can	Radial, Can	Radial, Can	Radial, Can
Polarization	Polar	Polar	Polar	Polar	Polar
Product Status	Obsolete	Obsolete	Not For New Designs	Not For New Designs	Not For New Designs
RoHS Status	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant

Engineering Selection Recommendations

For Direct PCB Layout Compatibility:

UFG1V331MHM and UPW2A331MHD are recommended when PCB footprint and lead spacing of 0.295" (7.50 mm) must be preserved. Both parts maintain the original lead spacing and overall can diameter of 0.630" (16.00 mm), ensuring mechanical fit without PCB redesign. UFG1V331MHM matches the 35 V rating and 1000-hour lifetime specification. UPW2A331MHD provides enhanced reliability with 8000-hour lifetime at 105°C and higher voltage rating, suitable for applications requiring extended service life.

For Compact Form Factor Applications:

UFW1V331MPD and UKW1V331MPD offer reduced physical dimensions (0.394" diameter, 0.492" height) with improved lifetime ratings of 2000 hours at 85°C. These parts require PCB layout modification due to different lead spacing (0.197" / 5.00 mm) but provide space savings and enhanced reliability for audio applications with thermal constraints.

Compliance and Regulatory Status:

All substitute parts maintain ROHS3 compliance and REACH unaffected status, consistent with the original RFS-35V331MJ6#5. All parts carry EAR99 ECCN classification and 8532.22.0020 HTSUS code. Product status varies: UFG1V331MHM is obsolete (matching original status); UFW1V331MPD, UKW1V331MPD, and UPW2A331MHD are classified as "Not For New Designs," indicating limited availability and suitability for legacy system support rather than new product development.

Frequently Asked Questions (FAQ)

Q: Can UFW1V331MPD or UKW1V331MPD be used as direct replacements without PCB modification?

A: No. UFW1V331MPD and UKW1V331MPD have lead spacing of 0.197" (5.00 mm) compared to the original 0.295" (7.50 mm). PCB through-hole pad spacing must be verified and modified if necessary. Physical dimensions are also significantly smaller (0.394" diameter vs. 0.630" diameter), which may affect mounting clearance and thermal dissipation characteristics.

Q: Is UPW2A331MHD electrically compatible with the RFS-35V331MJ6#5?

A: Yes. UPW2A331MHD is electrically compatible as a direct replacement. The 100 V rating exceeds the 35 V requirement, and the 330 µF capacitance is identical. However, UPW2A331MHD is physically larger and designed for general-purpose applications rather than audio-specific use. Verify that the increased physical dimensions and different thermal characteristics do not conflict with PCB layout or thermal management requirements.

Q: What is the significance of the lifetime rating difference between substitute parts?

A: Lifetime rating indicates the expected operational duration at specified temperature conditions. The original RFS-35V331MJ6#5 is rated for 1000 hours at 85°C. UFG1V331MHM matches this specification. UFW1V331MPD and UKW1V331MPD provide 2000 hours at 85°C, offering extended reliability. UPW2A331MHD provides 8000 hours at 105°C, indicating superior long-term reliability under elevated temperature conditions. Selection depends on application duty cycle and expected service life requirements.

Q: Why do UFG1V331MHM, UFW1V331MPD, and UKW1V331MPD have lower ripple current ratings than the original part?

A: Ripple current capability is influenced by physical size, internal construction, and thermal design. The original RFS-35V331MJ6#5 is rated for 785 mA at 120 Hz. UFG1V331MHM (446 mA), UFW1V331MPD (470 mA), and UKW1V331MPD (470 mA) have lower ratings due to smaller physical dimensions and different internal construction. Verify that the substitute part's ripple current rating meets the application's AC current requirements at the operating frequency.

Q: Are all substitute parts suitable for audio applications?

A: UFG1V331MHM, UFW1V331MPD, and UKW1V331MPD are specified for audio applications and are direct functional equivalents. UPW2A331MHD is specified for general-purpose applications. While UPW2A331MHD is electrically compatible, its design characteristics (higher voltage rating, extended temperature range, different ripple current profile) are optimized for general-purpose use rather than audio-specific requirements. Verify performance in the target audio circuit before production implementation.

Q: What is the impact of product status classification on part selection?

A: UFG1V331MHM is classified as obsolete, matching the original part status. UFW1V331MPD, UKW1V331MPD, and UPW2A331MHD are classified as "Not For New Designs," indicating limited manufacturing availability and suitability for legacy system support only. For ongoing production of new equipment, these parts are not recommended. Selection should prioritize current-generation components with active manufacturing status and extended availability commitments.

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