RFS-50V102MK9#5 Equivalent & Substitute Parts

Part Overview

The RFS-50V102MK9#5 is a 1000 µF, 50 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 procurement and design continuity. Substitute parts must maintain the same capacitance value, tolerance, and voltage rating while accommodating variations in physical dimensions, lifetime ratings, and electrical characteristics within acceptable engineering parameters.

Key Parameters

Parameter	Value	Unit
Capacitance	1000	µF
Voltage - Rated	50	V
Tolerance	±20%	-
Polarization	Polar	-
Mounting Type	Through Hole	-
Package / Case	Radial, Can	-
Operating Temperature Range	-40°C ~ 85°C	-
Lifetime @ Temperature	1000 Hrs @ 85°C	-
Lead Spacing	0.295" (7.50mm)	-
Size / Dimension	0.709" Dia (18.00mm)	-
Height - Seated (Max)	1.575" (40.00mm)	-
Applications	Audio	-
RoHS Status	ROHS3 Compliant	-

Substitute Part Grouping Explanation

Substitute parts for the RFS-50V102MK9#5 are classified into two categories based on substitution compatibility:

Upgrade Substitutes maintain the same capacitance (1000 µF) and tolerance (±20%) while offering enhanced electrical performance through higher voltage ratings or extended lifetime specifications. These parts are electrically compatible in applications where the original 50 V rating is not a limiting constraint.

Similar Substitutes maintain identical electrical specifications (1000 µF, ±20%, 50 V) and are direct functional equivalents. These parts differ primarily in physical dimensions, lead spacing, or lifetime ratings.

The substitution logic is based on the following critical parameters:

Capacitance value: 1000 µF (fixed)
Tolerance: ±20% (fixed)
Voltage rating: 50 V minimum (upgrade substitutes may exceed this)
Polarization: Polar (fixed)
Mounting type: Through Hole (fixed)
Package type: Radial, Can (fixed)
Operating temperature range: -40°C ~ 85°C minimum (fixed)

Parameter Comparison

Parameter	RFS-50V102MK9#5 (Main)	510DX108M063FR2D (Upgrade)	UKW2A102MHD (Upgrade)	UFG1H102MHM (Similar)	UKW1H102MHD (Similar)
Manufacturer	Elna America	Vishay Sprague	Nichicon	Nichicon	Nichicon
Capacitance	1000 µF	1000 µF	1000 µF	1000 µF	1000 µF
Tolerance	±20%	±20%	±20%	±20%	±20%
Voltage - Rated	50 V	63 V	100 V	50 V	50 V
Lifetime @ Temp.	1000 Hrs @ 85°C	2000 Hrs @ 125°C	2000 Hrs @ 85°C	1000 Hrs @ 85°C	2000 Hrs @ 85°C
Operating Temperature	-40°C ~ 85°C	-40°C ~ 125°C	-40°C ~ 85°C	-40°C ~ 85°C	-40°C ~ 85°C
Polarization	Polar	Polar	Polar	Polar	Polar
Mounting Type	Through Hole	Through Hole	Through Hole	Through Hole	Through Hole
Package / Case	Radial, Can	Radial, Can	Radial, Can	Radial, Can	Radial, Can
Lead Spacing	0.295" (7.50mm)	0.295" (7.50mm)	0.295" (7.50mm)	0.295" (7.50mm)	0.197" (5.00mm)
Size / Dimension	0.709" Dia (18.00mm)	0.709" Dia (18.00mm)	0.709" Dia (18.00mm)	0.630" Dia (16.00mm)	0.492" Dia (12.50mm)
Height - Seated (Max)	1.575" (40.00mm)	1.575" (40.00mm)	1.575" (40.00mm)	1.319" (33.50mm)	0.984" (25.00mm)
Ripple Current @ 120 Hz	1.985 A	2.256 A	1.37 A	1.143 A	1.3 A
Product Status	Obsolete	Active	Not For New Designs	Obsolete	Not For New Designs
RoHS Status	ROHS3 Compliant	RoHS non-compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant

Engineering Selection Recommendations

For Direct Replacement (Same Electrical Specifications):

UFG1H102MHM and UKW1H102MHD are functionally equivalent to RFS-50V102MK9#5, maintaining identical capacitance, voltage rating, tolerance, and operating temperature range. Both parts are ROHS3 compliant. UFG1H102MHM is physically smaller (0.630" diameter, 1.319" height) with reduced ripple current capacity (1.143 A @ 120 Hz). UKW1H102MHD features a smaller footprint (0.492" diameter, 0.984" height) with 5.00mm lead spacing and extended lifetime (2000 Hrs @ 85°C), but reduced ripple current capacity (1.3 A @ 120 Hz). Both are classified as obsolete or not for new designs.

For Enhanced Performance (Upgrade Substitutes):

510DX108M063FR2D (Vishay Sprague) provides higher voltage rating (63 V) and extended lifetime (2000 Hrs @ 125°C) with improved ripple current capacity (2.256 A @ 120 Hz). Physical dimensions and lead spacing match the original part. However, this part is RoHS non-compliant. This substitute is suitable for applications requiring higher voltage margin or extended operational life at elevated temperatures.

UKW2A102MHD (Nichicon) offers the highest voltage rating (100 V) with extended lifetime (2000 Hrs @ 85°C) and ROHS3 compliance. Physical dimensions and lead spacing are identical to the main part. Ripple current capacity is reduced (1.37 A @ 120 Hz). This substitute is appropriate for applications requiring maximum voltage headroom while maintaining RoHS compliance.

Compliance Considerations:

For applications requiring RoHS3 compliance, UFG1H102MHM, UKW1H102MHD, and UKW2A102MHD are suitable. The 510DX108M063FR2D is RoHS non-compliant and should be used only in applications where RoHS compliance is not required.

Frequently Asked Questions (FAQ)

Q: Can UFG1H102MHM be used as a direct replacement for RFS-50V102MK9#5?

A: UFG1H102MHM is electrically equivalent with identical capacitance (1000 µF), voltage rating (50 V), and tolerance (±20%). However, it has a smaller physical footprint (0.630" diameter vs. 0.709" diameter) and lower ripple current capacity (1.143 A @ 120 Hz vs. 1.985 A @ 120 Hz). PCB layout verification is required to confirm dimensional compatibility.

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

A: Similar substitutes (UFG1H102MHM, UKW1H102MHD) maintain the same electrical specifications as the original part. Upgrade substitutes (510DX108M063FR2D, UKW2A102MHD) offer enhanced performance through higher voltage ratings or extended lifetime, making them suitable for applications where the original specifications are insufficient.

Q: Is UKW1H102MHD compatible with the original PCB layout?

A: UKW1H102MHD has different lead spacing (0.197" / 5.00mm vs. 0.295" / 7.50mm) and smaller physical dimensions (0.492" diameter, 0.984" height). PCB layout modification is required for this substitute.

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

A: UKW2A102MHD provides the longest lifetime specification (2000 Hrs @ 85°C) with ROHS3 compliance and 100 V voltage rating. 510DX108M063FR2D offers extended lifetime at higher temperature (2000 Hrs @ 125°C) but is RoHS non-compliant.

Q: Can 510DX108M063FR2D be used in RoHS-compliant applications?

A: No. 510DX108M063FR2D is RoHS non-compliant and cannot be used in applications requiring RoHS3 certification. Use UKW2A102MHD or UFG1H102MHM for RoHS-compliant designs.

Q: What is the impact of reduced ripple current in substitute parts?

A: Ripple current capacity affects thermal performance under AC load conditions. Substitutes with lower ripple current ratings (UFG1H102MHM: 1.143 A, UKW1H102MHD: 1.3 A) may generate higher internal heat in high-ripple-current applications. Verify application ripple current requirements before selection.

Q: Are all substitute parts currently available for procurement?

A: 510DX108M063FR2D is active status with 990 units in stock. UKW2A102MHD is not for new designs with 1085 units in stock. UFG1H102MHM and UKW1H102MHD are obsolete or not for new designs with 1221 and 1188 units in stock respectively. Verify long-term availability with suppliers for production designs.

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