381LQ331M315H452 Equivalent & Substitute Parts Reference

Part Overview

The 381LQ331M315H452 is a 330 µF, 315 V aluminum electrolytic capacitor manufactured by Cornell Dubilier Electronics (CDE) in a radial, can snap-in package. This component is classified as obsolete, indicating discontinued production. The part operates across a temperature range of -40°C to 105°C with a rated lifetime of 2000 hours at 105°C, suitable for general-purpose applications requiring high-voltage energy storage and filtering.

Due to obsolete status, equivalent and substitute parts from active product lines are necessary to maintain design continuity and ensure long-term component availability for new production runs and field replacements.

Key Parameters

Parameter	Value	Unit	Substitution Criticality
Capacitance	330	µF	Critical
Voltage Rating	315	V	Critical
Tolerance	±20%	%	Critical
ESR @ 120 Hz	502	mOhm	Important
Lifetime @ 105°C	2000	Hours	Important
Operating Temperature Range	-40 to 105	°C	Critical
Lead Spacing	10.00	mm	Critical
Package Type	Radial, Can - Snap-In	—	Critical
Mounting Type	Through Hole	—	Critical
RoHS Status	ROHS3 Compliant	—	Important

Substitute Part Grouping Explanation

Substitution logic for the 381LQ331M315H452 is based on the following allowed parameters:

Critical Matching Parameters:

Capacitance: 330 µF (exact match required)
Voltage Rating: 315 V (exact match required)
Tolerance: ±20% (exact match required)
Operating Temperature Range: -40°C to 105°C (exact match required)
Lead Spacing: 10.00 mm (exact match required)
Package Type: Radial, Can - Snap-In (exact match required)
Mounting Type: Through Hole (exact match required)

Important Matching Parameters:

ESR @ 120 Hz: 502 mOhm (preferred match; higher values acceptable within design margins)
Lifetime @ 105°C: 2000 hours minimum (higher values provide enhanced reliability)
Ripple Current Ratings: 1.2 A @ 120 Hz and 1.68 A @ 20 kHz (minimum requirements)

Compliance Parameters:

RoHS3 Compliant (required for regulatory conformance)
REACH Unaffected (required for regulatory conformance)

Substitute parts are grouped into two categories:

Category A: 381LQ Series (Same Generation, Active Status) Parts 381LQ331M315J032, 381LQ331M315J042, and 381LQ331M315K012 maintain identical electrical specifications (330 µF, 315 V, ±20%, 502 mOhm ESR, 2000 Hrs @ 105°C) with variations in physical dimensions. These parts differ only in can diameter and height, allowing mechanical substitution when board layout permits.

Category B: 381LX Series (Enhanced Lifetime, Active Status) Parts 381LX331M315A022, 381LX331M315J052, 381LX331M315J452, 381LX331M315K032, and 381LX331M315K042 provide extended lifetime (3000 hours @ 105°C) while maintaining all critical electrical parameters. These parts are direct functional upgrades with improved reliability margins.

Parameter Comparison

Part Number	Manufacturer	Series	Status	Capacitance (µF)	Voltage (V)	Tolerance (%)	ESR @ 120Hz (mOhm)	Lifetime @ 105°C (Hrs)	Diameter (mm)	Height (mm)	Lead Spacing (mm)	Inventory (Pcs)
381LQ331M315H452	CDE	381LQ	Obsolete	330	315	±20	502	2000	22.00	47.00	10.00	1064
381LQ331M315J032	CDE	381LQ	Active	330	315	±20	502	2000	25.00	37.00	10.00	916
381LQ331M315J042	CDE	381LQ	Active	330	315	±20	600	2000	25.00	42.00	10.00	998
381LQ331M315K012	CDE	381LQ	Active	330	315	±20	502	2000	30.00	27.00	10.00	874
381LX331M315A022	CDE	381LX	Active	330	315	±20	—	3000	35.00	32.00	10.00	1082
381LX331M315J052	CDE	381LX	Active	330	315	±20	—	3000	25.00	52.00	10.00	1068
381LX331M315J452	CDE	381LX	Active	330	315	±20	—	3000	25.00	47.00	10.00	1081
381LX331M315K032	CDE	381LX	Active	330	315	±20	—	3000	30.00	37.00	10.00	917
381LX331M315K042	CDE	381LX	Active	330	315	±20	—	3000	30.00	42.00	10.00	816

Engineering Selection Recommendations

For Direct Replacement (Same Electrical Performance):

Select from the 381LQ series (381LQ331M315J032, 381LQ331M315J042, 381LQ331M315K012) when board layout accommodates dimensional variations. These parts maintain identical electrical specifications to the obsolete 381LQ331M315H452, including 502 mOhm ESR and 2000-hour lifetime at 105°C. All three parts are active products with confirmed inventory availability and full RoHS3 compliance.

For Enhanced Reliability (Recommended):

Select from the 381LX series (381LX331M315A022, 381LX331M315J052, 381LX331M315J452, 381LX331M315K032, 381LX331M315K042) for applications requiring extended component lifetime. The 381LX series provides 3000-hour lifetime at 105°C, representing a 50% improvement over the original specification. All 381LX parts maintain identical capacitance, voltage rating, tolerance, and operating temperature range. These parts are active products with strong inventory levels and full regulatory compliance.

Dimensional Considerations:

The original 381LQ331M315H452 features a 22.00 mm diameter and 47.00 mm height. Substitute selection should account for available board space:

Compact footprint (27.00 mm height): 381LQ331M315K012
Matched height (37.00 mm to 42.00 mm): 381LQ331M315J032, 381LQ331M315J042, 381LX331M315K032, 381LX331M315K042
Original height match (47.00 mm): 381LX331M315J452

Compliance Status:

All substitute parts maintain RoHS3 compliance and REACH unaffected status, ensuring regulatory conformance for new production and field service applications.

Frequently Asked Questions (FAQ)

Q1: Can 381LQ series parts directly replace the obsolete 381LQ331M315H452?

A: Yes. Parts 381LQ331M315J032, 381LQ331M315J042, and 381LQ331M315K012 are electrically equivalent, maintaining 330 µF capacitance, 315 V rating, ±20% tolerance, and 2000-hour lifetime at 105°C. Substitution requires verification that board layout accommodates the different can diameters (25.00 mm or 30.00 mm versus the original 22.00 mm).

Q2: What is the advantage of 381LX series substitutes?

A: The 381LX series provides 3000-hour lifetime at 105°C compared to 2000 hours for the original part, representing a 50% reliability improvement. All other electrical parameters remain identical. This upgrade is suitable for applications where extended service life is beneficial.

Q3: Does ESR variation affect substitution suitability?

A: The original part specifies 502 mOhm ESR at 120 Hz. Part 381LQ331M315J042 specifies 600 mOhm ESR, which is acceptable for most general-purpose applications. The 381LX series does not specify ESR values but maintains equivalent ripple current ratings (1.2 A @ 120 Hz, 1.7 A @ 20 kHz). Verify ESR requirements for ripple-sensitive applications before selection.

Q4: Are all substitute parts in active production?

A: Yes. All recommended substitute parts (381LQ331M315J032, 381LQ331M315J042, 381LQ331M315K012, and all 381LX variants) are active products with confirmed inventory availability. The original 381LQ331M315H452 is obsolete and no longer manufactured.

Q5: What are the lead spacing requirements for PCB design?

A: All parts, including the original and all substitutes, maintain 10.00 mm lead spacing. PCB footprints designed for the original part are compatible with all substitute parts without modification to lead hole positions.

Q6: Which substitute part most closely matches the original dimensions?

A: Part 381LX331M315J452 provides the closest dimensional match, maintaining 25.00 mm diameter and 47.00 mm height identical to the original 381LQ331M315H452 (which has 22.00 mm diameter). For exact diameter matching, no substitute maintains the original 22.00 mm specification; however, 381LQ331M315J032 and 381LQ331M315J042 offer compact 25.00 mm diameter options.

Q7: Are these parts suitable for high-ripple-current applications?

A: Yes. All parts maintain ripple current ratings of 1.2 A at 120 Hz and 1.68 A to 1.7 A at 20 kHz, confirming suitability for general-purpose filtering and energy storage applications. Verify specific ripple current requirements against these ratings for your application.

Q8: What packaging options are available?

A: Most substitute parts are supplied in standard packaging. Part 381LQ331M315J042 and 381LX331M315K032 are available in bulk packaging. All parts are through-hole mounted with radial, can snap-in configuration.

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