381LQ331M350K022 Equivalent & Substitute Parts Reference

Part Overview

The 381LQ331M350K022 is a 330 µF, 350 V aluminum electrolytic capacitor manufactured by Cornell Dubilier Electronics (CDE) in a radial, can snap-in package. This component is classified as Active product status and is designed for general-purpose applications requiring stable capacitance and extended operational life at elevated temperatures. The part operates across a temperature range of -25°C to 105°C with a rated lifetime of 2000 hours at 105°C.

Equivalent and substitute parts are identified based on matching or exceeding the core electrical parameters: capacitance value (330 µF), tolerance (±20%), voltage rating (350 V minimum), package type (radial snap-in), lead spacing (10.00 mm), and physical dimensions. Substitute parts may feature improved performance characteristics such as lower ESR, extended lifetime ratings, or higher voltage ratings while maintaining mechanical and electrical compatibility.

Key Parameters

Parameter	Value	Unit	Substitution Relevance
Capacitance	330	µF	Must match exactly
Tolerance	±20%	%	Must match or be tighter
Voltage - Rated	350	V	Must equal or exceed
Package / Case	Radial, Can - Snap-In	-	Must match exactly
Lead Spacing	10.00	mm	Must match exactly
Size / Dimension	30.00 mm Dia	mm	Must match exactly
Height - Seated (Max)	32.00	mm	Must match or be less
Mounting Type	Through Hole	-	Must match exactly
Operating Temperature	-25°C ~ 105°C	°C	Must match or exceed range
Lifetime @ Temp.	2000	Hrs @ 105°C	Must equal or exceed
RoHS Status	ROHS3 Compliant	-	Must match or exceed
Polarization	Polar	-	Must match exactly

Substitute Part Grouping Explanation

Substitute parts for the 381LQ331M350K022 are grouped into two categories based on voltage rating and performance characteristics:

Category 1: Same Voltage Rating (350 V) - Direct Substitutes No direct substitutes at 350 V are provided in the substitute list.

Category 2: Higher Voltage Rating (400 V and Above) - Upgraded Substitutes Parts with voltage ratings of 400 V or higher are electrically compatible as substitutes because they maintain the same capacitance (330 µF), tolerance (±20%), package configuration (radial snap-in), and physical dimensions. Higher voltage ratings provide additional design margin and are suitable for applications where the original 350 V specification can accommodate a higher-rated component.

Substitution Logic:

Capacitance: 330 µF (fixed requirement)
Tolerance: ±20% (fixed requirement)
Voltage Rating: 350 V minimum (substitutes at 400 V, 450 V acceptable)
Package: Radial, Can - Snap-In (fixed requirement)
Lead Spacing: 10.00 mm (fixed requirement)
Diameter: 30.00 mm (fixed requirement)
Height: 32.00 mm maximum (substitutes must not exceed)
Mounting: Through Hole (fixed requirement)
Operating Temperature: -25°C to 105°C (fixed requirement)
Lifetime: 2000 hours minimum at 105°C (substitutes may exceed)

Parameter Comparison

Parameter	381LQ331M350K022 (Main)	381LQ331M400K032	400MXH330MEFCSN30X30	450MXK330MEFCFA30X30	B43642C9337M000
Manufacturer	Cornell Dubilier Electronics (CDE)	Cornell Dubilier Electronics (CDE)	Rubycon	Rubycon	EPCOS - TDK Electronics
Series	381LQ	381LQ	MXH	MXK	B43642
Capacitance	330 µF	330 µF	330 µF	330 µF	330 µF
Tolerance	±20%	±20%	±20%	±20%	±20%
Voltage - Rated	350 V	400 V	400 V	450 V	400 V
ESR @ Frequency	502 mOhm @ 120 Hz	553 mOhm @ 120 Hz	Not specified	Not specified	270 mOhm @ 100 Hz
Lifetime @ Temp.	2000 Hrs @ 105°C	2000 Hrs @ 105°C	2000 Hrs @ 105°C	3000 Hrs @ 105°C	3000 Hrs @ 105°C
Operating Temperature	-25°C ~ 105°C	-25°C ~ 105°C	-25°C ~ 105°C	-25°C ~ 105°C	-40°C ~ 105°C
Ripple Current @ 120 Hz	1.2 A	1.44 A	1.55 A	1.58 A	1.51 A
Lead Spacing	10.00 mm	10.00 mm	10.00 mm	10.00 mm	10.00 mm
Size / Dimension	30.00 mm Dia	30.00 mm Dia	30.00 mm Dia	30.00 mm Dia	30.00 mm Dia
Height - Seated (Max)	32.00 mm	37.00 mm	32.00 mm	32.00 mm	32.00 mm
Package / Case	Radial, Can - Snap-In	Radial, Can - Snap-In	Radial, Can - Snap-In	Radial, Can - Snap-In	Radial, Can - Snap-In
Mounting Type	Through Hole	Through Hole	Through Hole	Through Hole	Through Hole
RoHS Status	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant
REACH Status	REACH Unaffected	REACH Unaffected	REACH Unaffected	REACH Unaffected	REACH Unaffected
Product Status	Active	Active	Active	Active	Active

Engineering Selection Recommendations

381LQ331M400K032 (Cornell Dubilier Electronics) This part is a direct manufacturer equivalent from CDE with identical series designation (381LQ). It maintains the same capacitance, tolerance, and package configuration as the main part. The voltage rating is increased to 400 V, providing additional design margin. Height is increased to 37.00 mm, which exceeds the original 32.00 mm specification and may require PCB layout verification. Lifetime rating remains at 2000 hours at 105°C. All compliance certifications (ROHS3, REACH Unaffected) are maintained. Selection is appropriate when higher voltage margin is required and PCB height constraints permit the 37.00 mm dimension.

400MXH330MEFCSN30X30 (Rubycon) This Rubycon MXH series part matches all critical mechanical parameters including height (32.00 mm). Voltage rating is 400 V. Lifetime rating is 2000 hours at 105°C, matching the original specification. ESR data is not provided. Operating temperature range matches the original part. ROHS3 compliance and REACH Unaffected status are confirmed. Selection is appropriate when mechanical fit constraints require the 32.00 mm height and cross-manufacturer sourcing is acceptable.

450MXK330MEFCFA30X30 (Rubycon) This Rubycon MXK series part provides the highest voltage rating (450 V) and extended lifetime (3000 hours at 105°C). All mechanical parameters match the original specification including height (32.00 mm). Operating temperature range is -25°C to 105°C. ROHS3 compliance and REACH Unaffected status are confirmed. Selection is appropriate for applications requiring maximum voltage margin and extended operational life at elevated temperatures.

B43642C9337M000 (EPCOS - TDK Electronics) This EPCOS part features the lowest ESR specification (270 mOhm @ 100 Hz) among all substitutes, indicating superior high-frequency performance. Voltage rating is 400 V. Lifetime rating is extended to 3000 hours at 105°C. Operating temperature range is expanded to -40°C to 105°C, providing lower temperature capability. All mechanical parameters match the original specification including height (32.00 mm). ROHS3 compliance and REACH Unaffected status are confirmed. Selection is appropriate for applications requiring low ESR performance and extended temperature operating range.

Frequently Asked Questions (FAQ)

Q1: Can I use a 400 V rated capacitor in place of a 350 V rated capacitor?

A: Yes. A higher voltage rating provides additional electrical stress margin and is electrically compatible. The capacitor will operate safely in circuits designed for 350 V operation. However, verify that PCB layout and mechanical mounting accommodate any dimensional differences, particularly height variations.

Q2: What is the significance of ESR (Equivalent Series Resistance) in capacitor substitution?

A: ESR affects ripple current handling, heat generation, and high-frequency performance. Lower ESR values indicate better performance at high frequencies and lower power dissipation. The B43642C9337M000 (270 mOhm @ 100 Hz) has lower ESR than the main part (502 mOhm @ 120 Hz), making it suitable for applications with stringent ripple current or thermal requirements. ESR specifications not provided for Rubycon parts do not indicate incompatibility; verification with the manufacturer is recommended if ESR is a critical design parameter.

Q3: Why does the 381LQ331M400K032 have a different height (37.00 mm vs. 32.00 mm)?

A: The increased height accommodates the higher voltage rating (400 V) within the same diameter (30.00 mm). This is a standard design trade-off in capacitor construction. Verify that your PCB layout and mechanical clearances permit the additional 5.00 mm height before selection.

Q4: Are all substitute parts RoHS3 compliant?

A: Yes. All substitute parts listed are ROHS3 Compliant and REACH Unaffected, matching the compliance status of the main part 381LQ331M350K022.

Q5: What is the difference between the Rubycon MXH and MXK series?

A: The MXK series (450MXK330MEFCFA30X30) offers a higher voltage rating (450 V) and extended lifetime (3000 hours at 105°C) compared to the MXH series (400MXH330MEFCSN30X30), which has a 400 V rating and 2000-hour lifetime. Both maintain identical mechanical dimensions and package configuration.

Q6: Can I substitute based on capacitance value alone?

A: No. Substitution requires matching or exceeding multiple parameters: capacitance (330 µF exact), tolerance (±20%), voltage rating (350 V minimum), package type (radial snap-in), lead spacing (10.00 mm), diameter (30.00 mm), and height (32.00 mm maximum). All parameters must be verified before selection.

Q7: What does "Polar" polarization mean?

A: Polar indicates this is an electrolytic capacitor with defined positive and negative terminals. Polarity must be observed during installation. All listed parts maintain polar polarization and are directly compatible in this regard.

Q8: Is the extended lifetime (3000 hours vs. 2000 hours) a critical factor for my application?

A: Extended lifetime indicates the capacitor maintains its electrical characteristics for a longer duration at 105°C. Selection depends on your application's expected operational life and thermal environment. For applications with continuous high-temperature operation, extended lifetime parts (450MXK330MEFCFA30X30 or B43642C9337M000) provide additional reliability margin.

Q9: Can I use the B43642C9337M000 in a circuit with temperature extremes below -25°C?

A: Yes. The B43642C9337M000 operates from -40°C to 105°C, extending the lower temperature limit by 15°C compared to the main part (-25°C to 105°C). This makes it suitable for applications requiring operation in colder environments.

Q10: What should I verify before finalizing a substitute part selection?

A: Verify the following: (1) Voltage rating meets or exceeds circuit requirements; (2) Physical dimensions (height, diameter, lead spacing) fit PCB layout and mechanical constraints; (3) ESR and ripple current specifications meet application performance requirements; (4) Operating temperature range covers your application environment; (5) Lifetime rating aligns with expected product service life; (6) Compliance certifications (RoHS, REACH) match your regulatory requirements.

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