381LR151M400H032 Equivalent & Substitute Parts

Part Overview

The Cornell Dubilier Electronics 381LR151M400H032 is a 150 µF, 400 V aluminum electrolytic capacitor in radial, can snap-in configuration. This component is designed for general-purpose applications requiring through-hole mounting with a 10.00 mm lead spacing. The part is Active status and RoHS3 compliant, suitable for industrial and commercial equipment operating across the -25°C to 105°C temperature range. Equivalent and substitute parts are identified to address inventory availability, extended operational lifetime requirements, or voltage rating upgrades while maintaining mechanical and electrical compatibility.

Key Parameters

Parameter	Value
Capacitance	150 µF
Voltage Rating	400 V
Tolerance	±20%
Package Type	Radial, Can - Snap-In
Lead Spacing	0.394" (10.00 mm)
Diameter	0.866" (22.00 mm)
Height (Seated Max)	1.457" (37.00 mm)
Mounting Type	Through Hole
Operating Temperature	-25°C to 105°C
Polarization	Polar
RoHS Status	RoHS3 Compliant

Substitute Part Grouping Explanation

Substitution of the 381LR151M400H032 is determined by strict adherence to the following parameters:

Critical Parameters (Must Match):

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

Allowable Variation Parameters:

Voltage Rating: Equal to or greater than 400 V
Height (Seated Max): Within ±0.019" (±0.50 mm) of 1.457" (37.00 mm)
Lifetime @ 105°C: Any duration (3000 Hrs or greater)

Substitute parts are classified into two categories: Upgrade parts (higher voltage rating or extended lifetime) and Parametric Equivalents (matching voltage rating). All substitute parts maintain identical mechanical footprint and electrical characteristics within the specified tolerance bands.

Parameter Comparison

Part Number	Manufacturer	Series	Capacitance	Voltage	Tolerance	Lifetime @ 105°C	Height (Max)	Ripple Current @ 120 Hz	RoHS Status
381LR151M400H032	Cornell Dubilier Electronics	381LR	150 µF	400 V	±20%	3000 Hrs	1.457"	800 mA	RoHS3
400MXG150MEFCSN22X35	Rubycon	MXG	150 µF	400 V	±20%	3000 Hrs	1.457"	1.13 A	RoHS3
LGX2G151MELZ35	Nichicon	LGX	150 µF	400 V	±20%	5000 Hrs	1.457"	860 mA	RoHS3
420VXH150MEFCSN22X35	Rubycon	VXH	150 µF	420 V	±20%	5000 Hrs	1.457"	1.12 A	RoHS3
LQSW6151MELZ35	Nichicon	LQS	150 µF	420 V	±20%	3000 Hrs	1.457"	840 mA	RoHS3
ELXS421VSN151MP35S	Chemi-Con	LXS	150 µF	420 V	±20%	5000 Hrs	1.476"	930 mA	RoHS3
450MXG150MEFCSN22X35	Rubycon	MXG	150 µF	450 V	±20%	3000 Hrs	1.457"	1.13 A	RoHS3
450VXH150MEFCSN22X35	Rubycon	VXH	150 µF	450 V	±20%	5000 Hrs	1.457"	1.13 A	RoHS3

Engineering Selection Recommendations

Parametric Equivalent (Direct Replacement):

The 400MXG150MEFCSN22X35 (Rubycon MXG series) is a parametric equivalent matching the 381LR151M400H032 in voltage rating, capacitance, tolerance, and physical dimensions. Both components share identical 3000-hour lifetime at 105°C and are RoHS3 compliant. This part is suitable for direct substitution in applications where the original specification is maintained.

Upgrade Options (Higher Voltage Rating):

The 420VXH150MEFCSN22X35 and 450VXH150MEFCSN22X35 (Rubycon VXH series) provide voltage ratings of 420 V and 450 V respectively, with extended 5000-hour lifetime at 105°C. These upgrades are electrically compatible and mechanically interchangeable, offering improved voltage margin and operational longevity. The 420VXH150MEFCSN22X35 represents a moderate voltage upgrade, while the 450VXH150MEFCSN22X35 provides maximum voltage headroom.

Extended Lifetime Options:

The LGX2G151MELZ35 (Nichicon LGX series) maintains the 400 V rating while extending operational lifetime to 5000 hours at 105°C. This option is applicable where extended service life is required without voltage upgrade. The ELXS421VSN151MP35S (Chemi-Con LXS series) combines 420 V rating with 5000-hour lifetime, offering both voltage and lifetime improvements.

Compliance Verification:

All substitute parts are RoHS3 compliant and REACH unaffected, matching the regulatory status of the original component. All parts are classified as EAR99 and share the same HTSUS code (8532.22.0040).

Frequently Asked Questions (FAQ)

Q: Can the 381LR151M400H032 be replaced with a higher voltage-rated capacitor?

A: Yes. Substitute parts rated at 420 V or 450 V are electrically and mechanically compatible. Higher voltage ratings provide additional safety margin in the circuit without affecting performance at the original 400 V operating point. The capacitance, tolerance, package type, and lead spacing remain identical.

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

A: Both Rubycon series maintain identical physical dimensions and lead spacing. The primary difference is operational lifetime: MXG series components are rated for 3000 hours at 105°C, while VXH series components are rated for 5000 hours at 105°C. Voltage ratings vary within each series (400 V, 420 V, 450 V available).

Q: Are there height differences between substitute parts?

A: Most substitute parts maintain the 1.457" (37.00 mm) seated height. The ELXS421VSN151MP35S (Chemi-Con) has a maximum seated height of 1.476" (37.50 mm), representing a 0.019" (0.50 mm) increase. This minor variation remains within typical PCB design tolerances for snap-in capacitor mounting.

Q: Which substitute offers the best combination of voltage upgrade and extended lifetime?

A: The 450VXH150MEFCSN22X35 (Rubycon VXH series) provides the highest voltage rating (450 V) combined with extended 5000-hour lifetime at 105°C. The 420VXH150MEFCSN22X35 offers a moderate voltage upgrade (420 V) with the same 5000-hour lifetime at lower cost.

Q: Are all substitute parts RoHS3 compliant?

A: Yes. All substitute parts listed are RoHS3 compliant and REACH unaffected, matching the regulatory compliance of the original 381LR151M400H032.

Q: Can the 381LR151M400H032 be used in applications requiring 420 V or 450 V operation?

A: No. The 381LR151M400H032 is rated for 400 V maximum. Applications requiring higher voltage operation must use substitute parts with appropriate voltage ratings (420VXH150MEFCSN22X35 or 450VXH150MEFCSN22X35).

Q: What is the ripple current difference between the original part and substitutes?

A: The original 381LR151M400H032 is rated for 800 mA ripple current at 120 Hz. Most substitute parts provide higher ripple current ratings (840 mA to 1.13 A at 120 Hz), indicating improved thermal performance and lower ESR characteristics.

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