Equivalent & Substitute Parts for 381LX271M350K032

Part Overview

The 381LX271M350K032 is a 270 µF, 350 V aluminum electrolytic capacitor manufactured by Cornell Dubilier Electronics (CDE) in a radial, can snap-in package. This component is classified as obsolete, requiring identification of equivalent and substitute parts for ongoing applications. The part operates across a temperature range of -25°C to 105°C with a rated lifetime of 3000 hours at 105°C, making it suitable for general-purpose power supply and filtering applications. Equivalent and substitute parts must maintain the same capacitance, voltage rating, and mechanical compatibility while meeting current product availability and compliance requirements.

Key Parameters

Parameter	Value	Unit	Substitution Criticality
Capacitance	270	µF	Critical
Tolerance	±20%	-	Critical
Voltage - Rated	350	V	Critical
Operating Temperature Range	-25°C to 105°C	-	Critical
Lifetime @ Temperature	3000	Hrs @ 105°C	Important
Package / Case	Radial, Can - Snap-In	-	Critical
Lead Spacing	0.394"	(10.00 mm)	Critical
Size / Dimension	1.181" Dia	(30.00 mm)	Critical
Height - Seated (Max)	1.457"	(37.00 mm)	Critical
Mounting Type	Through Hole	-	Critical
Polarization	Polar	-	Critical
RoHS Status	ROHS3 Compliant	-	Important

Substitute Part Grouping Explanation

Substitution of the 381LX271M350K032 is determined by strict adherence to the following critical parameters:

Capacitance and Tolerance: All substitute parts must maintain 270 µF capacitance with ±20% tolerance to ensure circuit functionality and performance specifications.

Voltage Rating: The rated voltage must be 350 V or higher. Parts rated at 350 V are direct substitutes. Parts rated at 400 V are voltage upgrades and provide enhanced reliability margins.

Package and Mechanical Compatibility: Substitute parts must use radial, can snap-in packaging with through-hole mounting. Lead spacing of 0.394" (10.00 mm) is mandatory. Physical dimensions (diameter and height) must accommodate the PCB layout constraints of the original design.

Thermal and Lifetime Specifications: Operating temperature range must span -25°C to 105°C. Lifetime ratings of 3000 hours or greater at 105°C are acceptable; higher ratings indicate improved reliability.

Compliance: All substitute parts must maintain ROHS3 compliance and REACH unaffected status to meet regulatory requirements.

Substitutes are grouped into three categories:

Direct Substitutes: Parts with identical electrical specifications (270 µF, 350 V, 3000 Hrs @ 105°C) and compatible mechanical dimensions.

Upgrade Substitutes: Parts with higher voltage ratings (400 V) or improved ESR characteristics, maintaining the same capacitance and mechanical form factor.

Similar Substitutes: Parts with the same capacitance and voltage but different physical dimensions or thermal ratings, suitable only when PCB layout permits.

Parameter Comparison

Part Number	Manufacturer	Capacitance (µF)	Voltage (V)	Tolerance	Lifetime @ 105°C (Hrs)	Diameter (mm)	Height (mm)	Product Status
381LX271M350K032	CDE	270	350	±20%	3000	30.00	37.00	Obsolete
381LX271M350K022	CDE	270	350	±20%	3000	30.00	32.00	Active
SLP271M350E3P3	CDE	270	350	±20%	3000	30.00	32.00	Active
381LR271M400K032	CDE	270	400	±20%	3000	30.00	37.00	Active
SLP271M400E5P3	CDE	270	400	±20%	3000	30.00	37.00	Active
381LQ271M350J032	CDE	270	350	±20%	2000	25.00	37.00	Active
381LX271M350A012	CDE	270	350	±20%	3000	35.00	27.00	Active
381LX271M400K032	CDE	270	400	±20%	3000	30.00	37.00	Active
350VXH270MEFC30X25	Rubycon	270	350	±20%	5000	30.00	27.00	Active
B43254C4277M	EPCOS - TDK Electronics	270	350	±20%	3000	30.00	32.00	Active
ELXM351VSN271MR35S	Chemi-Con	270	350	±20%	7000	30.00	37.00	Active

Engineering Selection Recommendations

Direct Substitutes (Preferred for Pin-Compatible Replacement):

The parts 381LX271M350K022 and SLP271M350E3P3 are direct electrical equivalents to the 381LX271M350K032, maintaining 270 µF capacitance, 350 V rating, and 3000-hour lifetime at 105°C. Both are manufactured by Cornell Dubilier Electronics and carry active product status. The 381LX271M350K022 differs only in packaging designation (Bulk vs. standard) and has a reduced seated height of 32.00 mm compared to the original 37.00 mm. The SLP271M350E3P3 offers identical electrical performance with the same 32.00 mm height. Selection between these two depends on PCB layout constraints; if the original 37.00 mm height is required, neither direct substitute accommodates this dimension.

Voltage Upgrade Substitutes (Enhanced Reliability):

The 381LR271M400K032 and SLP271M400E5P3 provide 400 V rated voltage while maintaining 270 µF capacitance and 3000-hour lifetime. Both preserve the 30.00 mm diameter and 37.00 mm height of the original part, ensuring mechanical compatibility. The 381LR271M400K032 exhibits lower ESR (491 mOhm @ 120 Hz) compared to the original (737 mOhm @ 120 Hz), improving ripple current handling. The 381LX271M400K032 is an alternative 400 V upgrade from CDE with identical mechanical dimensions. These upgrades are suitable when circuit design permits higher voltage operation and when improved thermal performance is beneficial.

Cross-Manufacturer Substitutes (Compliance and Availability):

The B43254C4277M from EPCOS - TDK Electronics and ELXM351VSN271MR35S from Chemi-Con are functionally equivalent at 270 µF, 350 V, with 3000-hour and 7000-hour lifetimes respectively. Both maintain 30.00 mm diameter and are compatible with the original lead spacing. The ELXM351VSN271MR35S offers extended lifetime (7000 hours) and preserves the 37.00 mm height. The 350VXH270MEFC30X25 from Rubycon provides 5000-hour lifetime with 30.00 mm diameter but reduced height (27.00 mm), requiring PCB layout verification.

Selection Criteria:

Choose direct substitutes when PCB layout accommodates the reduced height (32.00 mm). Select voltage upgrades (400 V) when circuit design permits and improved thermal margins are desired. Cross-manufacturer parts are acceptable when supply chain considerations or compliance certifications favor alternative suppliers. All recommended substitutes maintain ROHS3 compliance and through-hole mounting compatibility.

Frequently Asked Questions (FAQ)

Q: Can the 381LX271M350K022 replace the 381LX271M350K032 directly on the PCB?

A: The 381LX271M350K022 is electrically equivalent with identical capacitance (270 µF), voltage (350 V), and lifetime (3000 Hrs @ 105°C). However, the seated height is reduced from 37.00 mm to 32.00 mm. Direct replacement is possible only if the PCB layout accommodates the shorter height. Lead spacing (10.00 mm) and diameter (30.00 mm) are identical, ensuring pin compatibility.

Q: What is the advantage of using a 400 V rated capacitor instead of 350 V?

A: The 381LR271M400K032 and SLP271M400E5P3 provide higher voltage headroom, reducing stress on the dielectric and extending component life. The 400 V versions also exhibit lower ESR values, improving ripple current handling and thermal performance. These upgrades are suitable when circuit design permits higher voltage operation without affecting functionality.

Q: Are cross-manufacturer parts (Rubycon, EPCOS, Chemi-Con) compatible with the original CDE design?

A: Yes, cross-manufacturer parts with identical electrical specifications (270 µF, 350 V, ±20% tolerance) and compatible mechanical dimensions (30.00 mm diameter, 10.00 mm lead spacing) are functionally compatible. All recommended substitutes maintain radial, can snap-in packaging, through-hole mounting, and ROHS3 compliance. Verify physical height constraints before selection.

Q: Why do some substitute parts have different heights (27.00 mm, 32.00 mm, 37.00 mm)?

A: Height variation reflects different internal construction and thermal design. The original 381LX271M350K032 uses a 37.00 mm height for its thermal and ESR characteristics. Shorter variants (27.00 mm, 32.00 mm) achieve similar electrical performance through optimized internal geometry. Selection depends on available PCB space; taller designs may offer lower ESR or improved ripple current handling.

Q: Is the 381LQ271M350J032 a suitable substitute despite its 2000-hour lifetime?

A: The 381LQ271M350J032 maintains 270 µF, 350 V, and ±20% tolerance but offers only 2000-hour lifetime compared to the original 3000 hours. This part is suitable only for applications with reduced thermal stress or shorter service life requirements. The reduced lifetime and smaller diameter (25.00 mm) may require PCB layout modification. For equivalent reliability, direct substitutes with 3000-hour or higher ratings are preferred.

Q: What does "snap-in" packaging mean for mechanical compatibility?

A: Snap-in packaging refers to the mechanical mounting method where the capacitor's leads engage with spring-loaded contacts on the PCB or chassis, rather than being soldered through holes. The 0.394" (10.00 mm) lead spacing is critical for proper engagement. All recommended substitutes maintain this snap-in design and lead spacing, ensuring mechanical compatibility without modification.

Q: Can the 381LX271M350A012 be used as a substitute despite its different dimensions?

A: The 381LX271M350A012 has a larger diameter (35.00 mm) and shorter height (27.00 mm) compared to the original (30.00 mm diameter, 37.00 mm height). While electrically equivalent, this part requires PCB layout verification to confirm space availability. The different form factor may not fit the original mounting location without mechanical redesign.

Q: Which substitute offers the best thermal performance?

A: The ELXM351VSN271MR35S from Chemi-Con provides the longest lifetime (7000 hours @ 105°C), indicating superior thermal design and reliability margin. The 350VXH270MEFC30X25 from Rubycon offers 5000-hour lifetime. Both exceed the original 3000-hour specification. For applications requiring maximum thermal margin and extended service life, these extended-lifetime options are recommended.

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