SXR121M050ST Equivalent & Substitute Parts

Part Overview

The SXR121M050ST is a 120 µF, 50 V aluminum electrolytic capacitor in radial, through-hole configuration manufactured by Cornell Dubilier Electronics (CDE). This component is classified as obsolete, necessitating identification of equivalent and substitute parts for ongoing production support and design continuity. The part operates across a temperature range of -40°C to 105°C with a rated lifetime of 4000 hours at 105°C, serving general-purpose applications requiring stable capacitance and low equivalent series resistance.

Key Parameters

Parameter	Value
Capacitance	120 µF
Voltage Rating	50 V
Tolerance	±20%
ESR @ 120 Hz	1.11 Ohm
Lifetime @ 105°C	4000 Hrs
Operating Temperature Range	-40°C ~ 105°C
Ripple Current @ 120 Hz	299 mA
Ripple Current @ 100 kHz	650 mA
Lead Spacing	0.197" (5.00 mm)
Diameter	0.394" (10.00 mm)
Height (Max)	0.630" (16.00 mm)
Mounting Type	Through Hole
Package Type	Radial, Can
RoHS Status	ROHS3 Compliant

Substitute Part Grouping Explanation

Substitution of the SXR121M050ST is determined by strict equivalence in the following critical parameters:

Primary Equivalence Criteria:

Capacitance: 120 µF (exact match required)
Tolerance: ±20% (exact match required)
Voltage Rating: 50 V minimum (equal or higher voltage rating acceptable)
Lead Spacing: 0.197" (5.00 mm) (exact match required for PCB compatibility)
Diameter: 0.394" (10.00 mm) (exact match required for mechanical fit)
Mounting Type: Through Hole (exact match required)
Package Type: Radial, Can (exact match required)
Polarization: Polar (exact match required)

Secondary Compatibility Parameters:

Operating Temperature Range: -40°C to 105°C minimum (equal or wider range acceptable)
RoHS Compliance: ROHS3 Compliant (required for regulatory alignment)

Substitute parts are grouped into two categories: Upgrade parts (higher voltage rating or extended lifetime) and Similar parts (matching voltage rating with enhanced performance characteristics).

Parameter Comparison

Parameter	SXR121M050ST (Main)	UPJ1H121MPD6	UPW1J121MPD	UPW1H121MPD6	EKZE630ELL121MJ16S
Manufacturer	Cornell Dubilier	Nichicon	Nichicon	Nichicon	Chemi-Con
Capacitance	120 µF	120 µF	120 µF	120 µF	120 µF
Voltage Rating	50 V	50 V	63 V	50 V	63 V
Tolerance	±20%	±20%	±20%	±20%	±20%
Lifetime @ 105°C	4000 Hrs	5000 Hrs	5000 Hrs	5000 Hrs	4000 Hrs
Operating Temperature	-40°C ~ 105°C	-55°C ~ 105°C	-55°C ~ 105°C	-55°C ~ 105°C	-40°C ~ 105°C
Lead Spacing	0.197" (5.00 mm)	0.197" (5.00 mm)	0.197" (5.00 mm)	0.197" (5.00 mm)	0.197" (5.00 mm)
Diameter	0.394" (10.00 mm)	0.394" (10.00 mm)	0.394" (10.00 mm)	0.394" (10.00 mm)	0.394" (10.00 mm)
Height (Max)	0.630" (16.00 mm)	0.650" (16.50 mm)	0.630" (16.00 mm)	0.492" (12.50 mm)	0.689" (17.50 mm)
Ripple Current @ 120 Hz	299 mA	435 mA	390 mA	403 mA	380 mA
Ripple Current @ 100 kHz	650 mA	—	600 mA	—	950 mA
RoHS Status	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant
Product Status	Obsolete	Not For New Designs	Not For New Designs	Not For New Designs	Active

Engineering Selection Recommendations

For Direct Replacement (Same Voltage Rating):

UPW1H121MPD6 (Nichicon, UPW series) provides direct functional equivalence to the SXR121M050ST with identical 50 V voltage rating and 120 µF capacitance. This part offers extended lifetime (5000 hours at 105°C versus 4000 hours), expanded operating temperature range (-55°C to 105°C), and improved ripple current handling (403 mA at 120 Hz). The reduced height (0.492" versus 0.630") provides additional PCB layout flexibility. Product status is "Not For New Designs," indicating mature production availability. ROHS3 compliance and REACH unaffected status confirm regulatory alignment.

UPJ1H121MPD6 (Nichicon, UPJ series) serves as an alternative 50 V equivalent with identical capacitance and tolerance. This part delivers 5000-hour lifetime at 105°C and extended temperature range (-55°C to 105°C). Ripple current capability (435 mA at 120 Hz) exceeds the original specification. Height specification (0.650") remains within acceptable PCB mounting envelope. Product status is "Not For New Designs" with full ROHS3 and REACH compliance.

For Voltage Upgrade Applications:

UPW1J121MPD (Nichicon, UPW series) provides 63 V voltage rating with identical 120 µF capacitance and ±20% tolerance. This upgrade configuration extends circuit protection margin in applications subject to voltage transients. Lifetime specification (5000 hours at 105°C) and operating temperature range (-55°C to 105°C) exceed original requirements. Height remains at 0.630" (16.00 mm), matching the original part. Ripple current at 120 Hz (390 mA) and 100 kHz (600 mA) provides adequate performance margin.

EKZE630ELL121MJ16S (Chemi-Con, KZE series) offers 63 V voltage rating with matching 120 µF capacitance and ±20% tolerance. This part maintains 4000-hour lifetime at 105°C and -40°C to 105°C operating range, directly matching the original thermal specifications. Ripple current capability (380 mA at 120 Hz, 950 mA at 100 kHz) provides enhanced high-frequency performance. Product status is "Active," ensuring long-term availability and production continuity. Height specification (0.689") represents minimal increase from original 0.630" and remains within typical PCB design tolerances. ROHS3 compliance and REACH unaffected status confirm regulatory requirements.

Frequently Asked Questions (FAQ)

Q: Can UPW1H121MPD6 be used as a direct replacement for SXR121M050ST?

A: Yes. UPW1H121MPD6 meets all primary equivalence criteria: 120 µF capacitance, ±20% tolerance, 50 V voltage rating, 0.197" lead spacing, 0.394" diameter, through-hole radial mounting, and ROHS3 compliance. The reduced height (0.492" versus 0.630") provides additional PCB layout margin. Extended lifetime (5000 hours at 105°C) and expanded temperature range (-55°C to 105°C) represent performance improvements over the original specification.

Q: What is the difference between "Upgrade" and "Similar" substitute classifications?

A: "Upgrade" substitutes provide enhanced voltage rating (63 V versus 50 V) or extended lifetime specifications while maintaining identical capacitance and tolerance. "Similar" substitutes match the original voltage rating (50 V) with equivalent or improved performance characteristics. Both categories satisfy mechanical and electrical compatibility requirements.

Q: Is height variation between substitute parts critical for PCB compatibility?

A: Height variation must be evaluated within specific PCB design constraints. UPW1H121MPD6 (0.492" height) provides reduced profile suitable for space-constrained layouts. UPJ1H121MPD6 (0.650" height) and UPW1J121MPD (0.630" height) remain within 0.020" of the original 0.630" specification. EKZE630ELL121MJ16S (0.689" height) represents a 0.059" increase and requires verification of clearance in the original PCB design. Lead spacing (0.197") and diameter (0.394") remain constant across all substitutes, ensuring PCB footprint compatibility.

Q: Why is EKZE630ELL121MJ16S classified as "Active" while Nichicon alternatives are "Not For New Designs"?

A: Product status reflects manufacturer production roadmap and long-term availability commitment. EKZE630ELL121MJ16S (Chemi-Con, Active status) indicates ongoing production and recommended selection for new designs requiring extended component lifecycle. Nichicon parts (Not For New Designs status) remain available for legacy system support but are not recommended for new product development. For applications requiring long-term supply assurance, EKZE630ELL121MJ16S provides superior availability continuity.

Q: Are all substitute parts ROHS3 compliant?

A: Yes. All listed substitute parts (UPJ1H121MPD6, UPW1J121MPD, UPW1H121MPD6, EKZE630ELL121MJ16S) carry ROHS3 Compliant certification, ensuring regulatory alignment with current environmental and hazardous substance restrictions. REACH status for Nichicon parts is "REACH Unaffected," and Chemi-Con part carries equivalent compliance documentation.

Q: Can a 63 V rated substitute be used in a circuit designed for 50 V?

A: Yes. Higher voltage-rated capacitors (63 V) are electrically compatible with 50 V circuit designs. The capacitor will operate at reduced stress levels, potentially extending component lifetime and improving reliability margins. Mechanical fit must be verified, particularly height clearance in the original PCB design. Lead spacing (0.197") and diameter (0.394") remain identical across all substitutes.

Q: What ripple current specifications should be considered for substitute selection?

A: Ripple current capability must equal or exceed the original specification to ensure thermal stability and prevent premature capacitor failure. SXR121M050ST specifies 299 mA at 120 Hz and 650 mA at 100 kHz. All listed substitutes meet or exceed these requirements: UPW1H121MPD6 (403 mA at 120 Hz), UPJ1H121MPD6 (435 mA at 120 Hz), UPW1J121MPD (390 mA at 120 Hz, 600 mA at 100 kHz), and EKZE630ELL121MJ16S (380 mA at 120 Hz, 950 mA at 100 kHz). Enhanced ripple current handling provides additional design margin for applications with variable load conditions.

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