SXR221M025ST

Part Overview

The SXR221M025ST is a 220 µF, 25 V aluminum electrolytic capacitor in radial through-hole configuration manufactured by Cornell Dubilier Electronics (CDE). This component is rated for general purpose applications with an operational lifetime of 4000 hours at 105°C and an operating temperature range of -40°C to 105°C. The part is obsolete, necessitating alternative components for new designs and ongoing system maintenance. Substitute parts are required to maintain circuit functionality and ensure long-term reliability in applications where the original part is no longer available.

Key Parameters

Parameter	Value
Manufacturer Part Number	SXR221M025ST
Manufacturer	Cornell Dubilier Electronics (CDE)
Series	SXR
Capacitance	220 µF
Tolerance	±20%
Voltage Rating	25 V
ESR @ 120 Hz	840 mOhms
Lifetime @ 105°C	4000 Hours
Operating Temperature Range	-40°C to 105°C
Ripple Current @ 120 Hz	250 mA
Ripple Current @ 100 kHz	500 mA
Lead Spacing	0.197" (5.00 mm)
Diameter	0.394" (10.00 mm)
Height (Seated, Max)	0.472" (12.00 mm)
Mounting Type	Through Hole
Package / Case	Radial, Can
Polarization	Polar
RoHS Status	ROHS3 Compliant
Product Status	Obsolete

Substitute Part Grouping Explanation

Substitution of the SXR221M025ST is determined by the following critical parameters: capacitance value (220 µF), tolerance (±20%), mounting type (through-hole radial), lead spacing (5.00 mm), can diameter (10.00 mm), and electrical ratings within the application's requirements.

The substitute parts are grouped into two categories:

Upgrade Parts maintain identical capacitance and tolerance while providing equal or higher voltage ratings (35 V) with enhanced electrical performance characteristics. These parts offer superior ripple current handling, lower impedance, and extended operational lifetimes at 105°C, making them suitable replacements for the original part in equivalent or more demanding circuit conditions.

Similar Part maintains the 220 µF capacitance and ±20% tolerance but at a higher voltage rating (50 V). This part provides additional voltage headroom and is mechanically compatible with the original footprint while offering improved thermal performance and ripple current capacity.

All substitute parts maintain mechanical compatibility through identical lead spacing (5.00 mm) and can diameter (10.00 mm), and are packaged as radial through-hole components. Compliance with ROHS3 standards is maintained across all alternatives.

Parameter Comparison

Parameter	SXR221M025ST	EKZE350ELL221MJC5S	UHE1V221MPD6	UPW1V221MPD	UHE1H221MPD
Manufacturer	Cornell Dubilier	Chemi-Con	Nichicon	Nichicon	Nichicon
Capacitance	220 µF	220 µF	220 µF	220 µF	220 µF
Tolerance	±20%	±20%	±20%	±20%	±20%
Voltage Rating	25 V	35 V	35 V	35 V	50 V
Lifetime @ 105°C	4000 Hours	4000 Hours	7000 Hours	5000 Hours	7000 Hours
Operating Temperature	-40°C to 105°C	-40°C to 105°C	-40°C to 105°C	-55°C to 105°C	-40°C to 105°C
Ripple Current @ 120 Hz	250 mA	515 mA	605.5 mA	494 mA	735 mA
Ripple Current @ 100 kHz	500 mA	1.03 A	865 mA	760 mA	1.05 A
Lead Spacing	5.00 mm	5.00 mm	5.00 mm	5.00 mm	5.00 mm
Diameter	10.00 mm	10.00 mm	10.00 mm	10.00 mm	10.00 mm
Height (Seated, Max)	12.00 mm	14.00 mm	12.50 mm	12.50 mm	16.00 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
RoHS Status	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant
Product Status	Obsolete	Active	Not For New Designs	Not For New Designs	Not For New Designs

Engineering Selection Recommendations

EKZE350ELL221MJC5S (Chemi-Con KZE Series) is recommended for new designs and applications requiring active product support. This part is the only active product among the available substitutes, ensuring availability and manufacturer support. It maintains the original 4000-hour lifetime specification at 105°C while providing a 35 V voltage rating. Physical dimensions permit direct board-level substitution with a maximum height of 14.00 mm, though board layout should accommodate this increase from the original 12.00 mm specification.

UHE1V221MPD6 and UPW1V221MPD (Nichicon UHE and UPW series) are classified as "Not For New Designs" and should be used only for legacy system maintenance and repair. UHE1V221MPD6 provides extended lifetime (7000 hours at 105°C) with improved ripple current performance. UPW1V221MPD extends the operating temperature range to -55°C and offers a 5000-hour lifetime specification. Both parts are mechanically compatible with heights of 12.50 mm.

UHE1H221MPD (Nichicon UHE Series, 50 V) provides the highest voltage margin and is suitable for applications requiring enhanced voltage headroom or operating in higher voltage environments. The 50 V rating allows this part to function in circuits originally specified for lower voltage ratings while maintaining full electrical performance. The 16.00 mm height requires verification of available board space.

All substitute parts maintain ROHS3 compliance and are electrically compatible with the original SXR221M025ST specification, provided the application voltage does not exceed 25 V, in which case the higher-rated alternatives ensure safe operation.

Frequently Asked Questions (FAQ)

Q: Can I use a 35 V or 50 V rated capacitor in place of the 25 V original part?

A: Yes. The substitute parts rated at 35 V and 50 V are electrically compatible with the original 25 V specification. A capacitor with a higher voltage rating can be used in applications rated for lower voltages. The higher voltage rating provides additional safety margin and does not compromise circuit functionality.

Q: Are all substitute parts mechanically compatible with the original PCB footprint?

A: All substitute parts maintain identical lead spacing (5.00 mm) and can diameter (10.00 mm), confirming mechanical compatibility. However, height differences must be verified: the original SXR221M025ST is 12.00 mm tall, while substitutes range from 12.50 mm to 16.00 mm. Board layout and clearance must accommodate the taller components, particularly the UHE1H221MPD at 16.00 mm.

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

A: Upgrade parts (EKZE350ELL221MJC5S, UHE1V221MPD6, UPW1V221MPD) maintain the original 25 V application voltage while providing higher voltage ratings (35 V) and enhanced electrical performance. The Similar part (UHE1H221MPD) operates at 50 V and is suitable for applications where additional voltage headroom is required or beneficial.

Q: Which part should I select for a new design?

A: EKZE350ELL221MJC5S is the recommended choice for new designs. This is the only active product with ongoing manufacturer support. All other substitutes are classified as "Not For New Designs" and should be reserved for legacy system maintenance.

Q: How do capacitance tolerance specifications affect part selection?

A: All substitute parts maintain the ±20% tolerance of the original SXR221M025ST. This tolerance applies equally across all alternatives, and no tolerance variation exists between substitutes. Component selection based on tolerance requirements will not differentiate these parts.

Q: What impact does ESR (Equivalent Series Resistance) have on substitution?

A: The original part specifies 840 mOhms ESR at 120 Hz. Substitute parts provide lower impedance values (53 mOhms to 90 mOhms range), resulting in superior ripple current performance and reduced heat generation during operation. Lower ESR improves circuit reliability, particularly in high-frequency ripple current applications.

Q: Can I use these parts interchangeably across different applications?

A: Substitution is valid only when the application voltage does not exceed the capacitor's rated voltage. All parts share identical 220 µF capacitance and ±20% tolerance. Voltage rating compatibility is the primary constraint. Ripple current and lifetime specifications should be verified against application requirements for demanding thermal or high-frequency environments.

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