381LX151M350H032 Equivalent & Substitute Parts

Part Overview

The 381LX151M350H032 is a 150 µF, 350 V aluminum electrolytic capacitor manufactured by Cornell Dubilier Electronics (CDE) in a radial, can snap-in package. This component is rated for 3000 hours at 105°C and is designed for general-purpose applications requiring through-hole mounting. The part is Active in product status and fully compliant with ROHS3 and REACH regulations.

Equivalent and substitute parts are identified when design requirements change, inventory constraints occur, or when enhanced performance characteristics are needed within the same mechanical and electrical envelope. Substitutes are selected based on matching or exceeding the core electrical parameters: capacitance, voltage rating, tolerance, operating temperature range, and physical dimensions.

Key Parameters

Parameter	Value	Unit
Capacitance	150	µF
Voltage - Rated	350	V
Tolerance	±20%	—
Operating Temperature Range	-25°C to 105°C	—
Lifetime @ 105°C	3000	Hrs
Lead Spacing	0.394" (10.00 mm)	—
Size / Diameter	0.866" (22.00 mm)	—
Height - Seated (Max)	1.457" (37.00 mm)	—
Mounting Type	Through Hole	—
Package / Case	Radial, Can - Snap-In	—
Polarization	Polar	—
RoHS Status	ROHS3 Compliant	—

Substitute Part Grouping Explanation

Substitution logic for the 381LX151M350H032 is based on the following criteria:

Direct Equivalents maintain identical electrical specifications: 150 µF capacitance, ±20% tolerance, 350 V rated voltage, -25°C to 105°C operating temperature, and radial snap-in package with 10.00 mm lead spacing and 22.00 mm diameter. These parts are interchangeable in applications where the original part specifications are required.

Voltage-Upgraded Substitutes increase the rated voltage above 350 V while maintaining 150 µF capacitance, ±20% tolerance, and identical mechanical dimensions. These parts are suitable for applications where higher voltage margin is beneficial and the physical footprint must remain unchanged. Voltage-upgraded parts include 400 V, 420 V, and 450 V ratings.

Lifetime-Enhanced Substitutes extend the thermal lifetime rating from 3000 hours to 5000 hours at 105°C while maintaining all other electrical and mechanical parameters. These parts provide extended operational life in high-temperature environments.

Height-Reduced Substitutes maintain all electrical parameters but reduce the seated height from 1.457" (37.00 mm) to 1.260" (32.00 mm). These parts are suitable for space-constrained applications where vertical clearance is limited.

All substitute parts maintain the following core compatibility criteria:

Capacitance: 150 µF
Tolerance: ±20%
Operating Temperature: -25°C to 105°C
Lead Spacing: 0.394" (10.00 mm)
Diameter: 0.866" (22.00 mm)
Mounting Type: Through Hole, Radial, Can - Snap-In
Polarization: Polar
RoHS3 Compliance
REACH Unaffected Status

Parameter Comparison

Part Number	Manufacturer	Series	Capacitance (µF)	Voltage (V)	Tolerance	Lifetime @ 105°C (Hrs)	Height (mm)	Ripple Current @ 120 Hz	Ripple Current @ 10-20 kHz
381LX151M350H032	Cornell Dubilier Electronics	381LX	150	350	±20%	3000	37.00	800 mA @ 120 Hz	1.1 A @ 20 kHz
381LQ151M350H022	Cornell Dubilier Electronics	381LQ	150	350	±20%	2000	32.00	820 mA @ 120 Hz	1.15 A @ 20 kHz
LGN2V151MELZ30	Nichicon	LGN	150	350	±20%	3000	32.00	820 mA @ 120 Hz	1.1726 A @ 50 kHz
400MXG150MEFCSN22X35	Rubycon	MXG	150	400	±20%	3000	37.00	1.13 A @ 120 Hz	1.582 A @ 10 kHz
420VXH150MEFCSN22X35	Rubycon	VXH	150	420	±20%	5000	37.00	1.12 A @ 120 Hz	1.568 A @ 10 kHz
450MXG150MEFCSN22X35	Rubycon	MXG	150	450	±20%	3000	37.00	1.13 A @ 120 Hz	1.582 A @ 10 kHz
450VXH150MEFCSN22X35	Rubycon	VXH	150	450	±20%	5000	37.00	1.13 A @ 120 Hz	1.582 A @ 10 kHz
ELXS421VSN151MP35S	Chemi-Con	LXS	150	420	±20%	5000	37.50	930 mA @ 120 Hz	1.3299 A @ 50 kHz
LGX2G151MELZ35	Nichicon	LGX	150	400	±20%	5000	37.00	860 mA @ 120 Hz	1.2298 A @ 50 kHz
LQSW6151MELZ35	Nichicon	LQS	150	420	±20%	3000	37.00	840 mA @ 120 Hz	1.2012 A @ 50 kHz

Engineering Selection Recommendations

Direct Equivalent Selection

The 381LQ151M350H022 (Cornell Dubilier Electronics) provides a direct mechanical and electrical equivalent with identical 150 µF, 350 V specifications. This part features a reduced height of 32.00 mm compared to the original 37.00 mm, making it suitable for space-constrained PCB layouts. However, the thermal lifetime is reduced to 2000 hours at 105°C versus the original 3000 hours. Selection of this part is appropriate when vertical clearance is the primary constraint and reduced thermal lifetime is acceptable for the application.

The LGN2V151MELZ30 (Nichicon) maintains identical electrical specifications and thermal lifetime (3000 hours at 105°C) with the same 32.00 mm reduced height. This part is suitable as a direct replacement when space constraints exist and thermal performance equivalent to the original is required. Both height-reduced options are ROHS3 compliant and REACH unaffected.

Voltage-Upgraded Selection

The 400MXG150MEFCSN22X35 (Rubycon) upgrades the voltage rating to 400 V while maintaining the original 37.00 mm height and 3000-hour thermal lifetime. This part is suitable for applications requiring enhanced voltage margin without sacrificing thermal performance or physical dimensions.

The 420VXH150MEFCSN22X35 (Rubycon) and LQSW6151MELZ35 (Nichicon) both provide 420 V rated voltage. The Rubycon part extends thermal lifetime to 5000 hours at 105°C, while the Nichicon part maintains 3000 hours. Both maintain the 37.00 mm height. Selection depends on whether extended thermal lifetime is required.

The 450MXG150MEFCSN22X35 (Rubycon) and 450VXH150MEFCSN22X35 (Rubycon) provide the highest voltage rating at 450 V. The VXH series extends thermal lifetime to 5000 hours at 105°C, while the MXG series maintains 3000 hours. Both maintain original dimensions.

Lifetime-Enhanced Selection

The 420VXH150MEFCSN22X35, 450VXH150MEFCSN22X35, ELXS421VSN151MP35S, and LGX2G151MELZ35 all provide extended 5000-hour thermal lifetime at 105°C. These parts are suitable for applications requiring extended operational life in high-temperature environments. The 420 V and 450 V options provide additional voltage margin beyond the original 350 V specification.

All substitute parts maintain ROHS3 compliance and REACH unaffected status, ensuring regulatory compatibility with the original part.

Frequently Asked Questions (FAQ)

Q: Can the 381LQ151M350H022 be used as a direct replacement for the 381LX151M350H032?

A: The 381LQ151M350H022 is mechanically and electrically compatible with identical 150 µF, 350 V specifications and ±20% tolerance. The primary difference is reduced height (32.00 mm versus 37.00 mm) and reduced thermal lifetime (2000 hours versus 3000 hours at 105°C). This part is suitable for space-constrained applications where the reduced thermal lifetime is acceptable.

Q: What is the advantage of selecting a voltage-upgraded substitute such as the 450VXH150MEFCSN22X35?

A: Voltage-upgraded substitutes provide enhanced voltage margin while maintaining identical capacitance (150 µF), tolerance (±20%), and mechanical dimensions. The 450VXH150MEFCSN22X35 additionally extends thermal lifetime to 5000 hours at 105°C, providing both voltage and thermal performance improvements. This part is suitable for applications where higher voltage stress or extended operational life is anticipated.

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

A: All substitute parts maintain the core mechanical compatibility: 0.394" (10.00 mm) lead spacing, 0.866" (22.00 mm) diameter, and radial snap-in package. Height-reduced substitutes (32.00 mm) fit within the original 37.00 mm footprint. Height-equivalent and height-increased substitutes (37.00 mm to 37.50 mm) require verification of vertical clearance on the PCB. All parts are through-hole mounted with identical lead configuration.

Q: What is the difference between the Rubycon MXG and VXH series substitutes?

A: Both Rubycon series maintain identical electrical specifications (150 µF, ±20% tolerance) and mechanical dimensions (37.00 mm height, 22.00 mm diameter). The primary difference is thermal lifetime: MXG series provides 3000 hours at 105°C, while VXH series extends to 5000 hours at 105°C. Selection depends on whether extended thermal performance is required for the application.

Q: Can a 420 V or 450 V rated substitute be used in a circuit designed for 350 V operation?

A: Yes. Voltage-rated capacitors are designed to operate safely at voltages equal to or below their rated voltage. A 420 V or 450 V rated capacitor will function correctly in a 350 V circuit, providing additional voltage margin and safety headroom. This is a standard engineering practice for component selection.

Q: Are all substitute parts ROHS3 compliant and REACH unaffected?

A: All substitute parts listed are ROHS3 compliant and REACH unaffected, matching the regulatory status of the original 381LX151M350H032. This ensures compatibility with regulatory requirements for electronic equipment manufacturing and distribution.

Q: What is the significance of ripple current ratings in substitute selection?

A: Ripple current ratings indicate the AC current the capacitor can safely handle at specified frequencies. Higher ripple current capability provides design margin for applications with significant AC stress. Substitute parts generally maintain or exceed the original ripple current specifications, ensuring thermal stability and extended operational life under AC stress conditions.

Q: How do Nichicon and Rubycon substitutes compare in terms of performance?

A: Both manufacturers provide equivalent electrical performance with 150 µF capacitance and ±20% tolerance. Nichicon parts (LGN, LGX, LQS series) and Rubycon parts (MXG, VXH series) differ in thermal lifetime ratings and ripple current characteristics. Selection should be based on specific application requirements for thermal performance, voltage rating, and ripple current handling capability.

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