RFS-50V330MH4#5 Equivalent & Substitute Parts Reference

Part Overview

The RFS-50V330MH4#5 is a 33 µF, 50 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 ±20% capacitance tolerance. The part is classified as Obsolete, making equivalent and substitute parts necessary for ongoing production and maintenance applications. The radial through-hole configuration with 5.00 mm lead spacing and 10.00 mm diameter housing supports audio and general-purpose circuit applications requiring stable capacitance performance across the specified operating temperature range of -40°C to 85°C.

Key Parameters

Parameter	Value	Unit
Capacitance	33	µF
Voltage - Rated	50	V
Tolerance	±20%	—
Operating Temperature Range	-40°C ~ 85°C	—
Lifetime @ Temperature	1000 Hrs @ 85°C	—
Lead Spacing	5.00	mm
Case Diameter	10.00	mm
Height - Seated (Max)	17.50	mm
Mounting Type	Through Hole	—
Package / Case	Radial, Can	—
Polarization	Polar	—
RoHS Status	ROHS3 Compliant	—

Substitute Part Grouping Explanation

Substitution of the RFS-50V330MH4#5 is determined by strict adherence to the following electrical and mechanical parameters:

Primary Substitution Criteria:

Capacitance: 33 µF (exact match required)
Tolerance: ±20% (acceptable range)
Lead Spacing: 5.00 mm (mechanical compatibility)
Case Diameter: 10.00 mm (PCB footprint compatibility)
Mounting Type: Through Hole (assembly process compatibility)
Package / Case: Radial, Can (form factor compatibility)
Polarization: Polar (circuit function requirement)

Voltage Rating Consideration: Substitute parts are grouped into two categories based on rated voltage:

Upgrade Substitutes (100 V Rated): Parts with 100 V rating provide higher voltage margin while maintaining identical capacitance, tolerance, lead spacing, and case dimensions. These are direct electrical upgrades suitable for circuits designed for 50 V operation.
Similar Substitutes (160 V Rated): Parts with 160 V rating provide maximum voltage margin and extended thermal performance. These maintain identical capacitance, tolerance, lead spacing, and case dimensions but with increased height (18.00 mm vs. 17.50 mm maximum).

All substitute parts maintain ROHS3 compliance and polar configuration. Substitution validity depends on circuit voltage requirements and available PCB height clearance.

Parameter Comparison

Parameter	RFS-50V330MH4#5	511D336M100CD4D	B41858C9336M000	ELXV101ELL330MJ16S	UFG2A330MPM	UKL2A330KPD	160LEX33MEFC10X16	160LLE33MEFC10X16	160PK33MEFC10X16	160PX33MEFC10X16	B43851F1336M000
Capacitance (µF)	33	33	33	33	33	33	33	33	33	33	33
Voltage - Rated (V)	50	100	100	100	100	100	160	160	160	160	160
Tolerance	±20%	±20%	±20%	±20%	±20%	±10%	±20%	±20%	±20%	±20%	±20%
Lead Spacing (mm)	5.00	5.00	5.00	5.00	5.00	5.00	5.00	5.00	5.00	5.00	5.00
Case Diameter (mm)	10.00	10.00	10.00	10.00	10.00	10.00	10.00	10.00	10.00	10.00	10.00
Height - Seated Max (mm)	17.50	17.00	17.00	17.50	17.50	17.50	18.00	18.00	18.00	18.00	17.00
Operating Temperature Range	-40°C ~ 85°C	-40°C ~ 105°C	-55°C ~ 105°C	-55°C ~ 105°C	-40°C ~ 85°C	-40°C ~ 85°C	-40°C ~ 125°C	-40°C ~ 105°C	-40°C ~ 85°C	-40°C ~ 105°C	-40°C ~ 105°C
Lifetime @ Temperature	1000 Hrs @ 85°C	1000 Hrs @ 105°C	5000 Hrs @ 105°C	3000 Hrs @ 105°C	1000 Hrs @ 85°C	2000 Hrs @ 85°C	5000 Hrs @ 125°C	20000 Hrs @ 105°C	2000 Hrs @ 85°C	2000 Hrs @ 105°C	3000 Hrs @ 105°C
Mounting Type	Through Hole	Through Hole	Through Hole	Through Hole	Through Hole	Through Hole	Through Hole	Through Hole	Through Hole	Through Hole	Through Hole
Package / Case	Radial, Can	Radial, Can	Radial, Can	Radial, Can	Radial, Can	Radial, Can	Radial, Can	Radial, Can	Radial, Can	Radial, Can	Radial, Can
Polarization	Polar	Polar	Polar	Polar	Polar	Polar	Polar	Polar	Polar	Polar	Polar
RoHS Status	ROHS3 Compliant	RoHS non-compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant
Product Status	Obsolete	Active	Active	Active	Obsolete	Not For New Designs	Active	Active	Active	Active	Active

Engineering Selection Recommendations

For Direct Replacement (100 V Upgrade Category):

The following parts provide direct electrical substitution with identical mechanical compatibility and improved voltage margin:

511D336M100CD4D (Vishay Sprague): Active product status. RoHS non-compliant. Suitable for applications where RoHS compliance is not required. Equivalent series resistance of 4.44 Ohm @ 120 Hz provides known impedance characteristics.
B41858C9336M000 (EPCOS - TDK Electronics): Active product status. ROHS3 compliant. Extended operating temperature range (-55°C ~ 105°C). Automotive-rated with 5000 hours lifetime at 105°C. Recommended for automotive and industrial applications requiring enhanced thermal performance.
ELXV101ELL330MJ16S (Chemi-Con): Active product status. ROHS3 compliant. AEC-Q200 automotive qualification. 3000 hours lifetime at 105°C. Identical height to original part (17.50 mm). Recommended for automotive applications.
UFG2A330MPM (Nichicon): Obsolete product status. ROHS3 compliant. Identical operating temperature range and lifetime characteristics to original part. Suitable for legacy audio applications where exact performance matching is required.
UKL2A330KPD (Nichicon): Not For New Designs status. ROHS3 compliant. ±10% tolerance provides tighter capacitance control than original ±20%. 2000 hours lifetime at 85°C. Suitable for existing designs requiring component refresh.

For Higher Voltage Applications (160 V Category):

The following parts provide maximum voltage margin with extended thermal performance. All maintain identical lead spacing and case diameter but with increased height (18.00 mm maximum):

160LEX33MEFC10X16 (Rubycon): Active product status. ROHS3 compliant. 5000 hours lifetime at 125°C. Extended operating temperature range (-40°C ~ 125°C). Recommended for high-temperature applications.
160LLE33MEFC10X16 (Rubycon): Active product status. ROHS3 compliant. 20000 hours lifetime at 105°C. Extended operating temperature range (-40°C ~ 105°C). Recommended for long-life applications requiring maximum reliability.
160PK33MEFC10X16 (Rubycon): Active product status. ROHS3 compliant. 2000 hours lifetime at 85°C. Operating temperature range (-40°C ~ 85°C). Suitable for general-purpose applications with voltage margin requirement.
160PX33MEFC10X16 (Rubycon): Active product status. ROHS3 compliant. 2000 hours lifetime at 105°C. Extended operating temperature range (-40°C ~ 105°C). Suitable for applications requiring both voltage and thermal margin.
B43851F1336M000 (EPCOS - TDK Electronics): Active product status. ROHS3 compliant. 3000 hours lifetime at 105°C. Reduced height (17.00 mm) compared to other 160 V options. Equivalent series resistance of 7.5 Ohm @ 120 Hz. Suitable for space-constrained applications.

Selection Priority:

For new designs: Select from Active product status parts with ROHS3 compliance.
For legacy designs: UFG2A330MPM or UKL2A330KPD maintain closest performance to original RFS-50V330MH4#5.
For automotive applications: ELXV101ELL330MJ16S or B41858C9336M000 (AEC-Q200 or automotive-rated).
For high-reliability applications: 160LLE33MEFC10X16 (20000 hours @ 105°C).
For space-constrained designs: B43851F1336M000 (17.00 mm height at 160 V rating).

Frequently Asked Questions (FAQ)

Q: Can I use a 100 V rated capacitor in place of the 50 V RFS-50V330MH4#5?

A: Yes. A 100 V rated capacitor with identical 33 µF capacitance, ±20% tolerance, 5.00 mm lead spacing, and 10.00 mm case diameter provides direct electrical substitution. The higher voltage rating creates additional safety margin in the circuit. Verify that the substitute part height (typically 17.00 mm to 17.50 mm) fits within available PCB clearance.

Q: What is the difference between 100 V and 160 V substitute options?

A: Both provide electrical substitution for the 50 V original part. The 160 V options offer maximum voltage margin and typically feature extended thermal performance (higher temperature ratings and longer lifetime specifications). However, 160 V parts generally have increased height (18.00 mm maximum) compared to the original 17.50 mm, requiring verification of PCB clearance.

Q: Are all substitute parts RoHS3 compliant?

A: No. The 511D336M100CD4D (Vishay Sprague) is RoHS non-compliant. All other listed substitutes are ROHS3 compliant. For applications requiring RoHS compliance, exclude the Vishay Sprague part.

Q: Which substitute part most closely matches the original RFS-50V330MH4#5 performance?

A: The UFG2A330MPM (Nichicon) provides the closest performance match, with identical operating temperature range (-40°C ~ 85°C), identical lifetime specification (1000 Hrs @ 85°C), and identical height (17.50 mm). Both are audio-rated components. However, UFG2A330MPM is classified as Obsolete.

Q: Can I use a ±10% tolerance part instead of ±20%?

A: Yes. The UKL2A330KPD offers ±10% tolerance, which is tighter than the original ±20%. This provides improved capacitance accuracy. Verify that the circuit design does not require the wider tolerance range of the original part.

Q: What is the significance of AEC-Q200 rating on the ELXV101ELL330MJ16S?

A: AEC-Q200 is an automotive qualification standard. The ELXV101ELL330MJ16S meets automotive reliability and performance requirements, making it suitable for automotive applications where component qualification is mandatory.

Q: Do all substitute parts have the same lead spacing and case diameter?

A: Yes. All listed substitute parts maintain 5.00 mm lead spacing and 10.00 mm case diameter, ensuring PCB footprint compatibility. However, height varies: most 100 V parts are 17.00 mm to 17.50 mm, while 160 V parts are typically 18.00 mm. Verify available PCB clearance before selection.

Q: Which substitute offers the longest operational lifetime?

A: The 160LLE33MEFC10X16 (Rubycon) offers 20000 hours at 105°C, the longest lifetime among all listed substitutes. This part is recommended for applications requiring maximum reliability and extended service life.

Q: Is the original RFS-50V330MH4#5 still available for purchase?

A: The RFS-50V330MH4#5 is classified as Obsolete. Current inventory availability is limited. Active product substitutes are recommended for new procurement and design implementations.

Q: What is the difference between "Upgrade," "Similar," and other product status classifications?

A: "Upgrade" substitutes provide improved electrical performance (higher voltage rating) while maintaining identical capacitance and mechanical compatibility. "Similar" substitutes provide alternative options with different voltage ratings or thermal characteristics. Product status (Active, Obsolete, Not For New Designs) indicates manufacturing availability and design recommendation status.

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