SLPX331M385H3P3 Equivalent & Substitute Parts

Part Overview

The SLPX331M385H3P3 is a 330 µF, 385 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 high-voltage energy storage and filtering.

Substitute parts become necessary when the original component reaches end-of-life inventory constraints, when design requirements demand enhanced performance specifications, or when alternative manufacturers offer improved reliability metrics within compatible electrical and mechanical parameters.

Key Parameters

Parameter	Value	Unit
Capacitance	330	µF
Voltage - Rated	385	V
Tolerance	±20%	-
ESR @ 120Hz	603	mOhm
Lifetime @ Temperature	3000 Hrs @ 85°C	-
Operating Temperature Range	-25°C to 85°C	-
Ripple Current @ 120 Hz	1.87	A
Ripple Current @ 20 kHz	2.75	A
Lead Spacing	10.00	mm
Case Diameter	35.00	mm
Height - Seated (Max)	32.00	mm
Package Type	Radial, Can - Snap-In	-
Mounting Type	Through Hole	-
RoHS Status	ROHS3 Compliant	-

Substitute Part Grouping Explanation

Substitute parts for the SLPX331M385H3P3 are qualified based on the following criteria:

Electrical Compatibility:

Capacitance value: 330 µF (exact match required)
Tolerance: ±20% (exact match required)
Voltage rating: Equal to or greater than 385 V
Polarization: Polar (exact match required)

Mechanical Compatibility:

Package type: Radial, Can - Snap-In (exact match required)
Lead spacing: 10.00 mm (exact match required)
Case diameter: 35.00 mm (exact match required)
Height - Seated (Max): 32.00 mm (exact match required)
Mounting type: Through Hole (exact match required)

Regulatory Compliance:

RoHS3 Compliant status required
REACH Unaffected status required

Substitute parts may vary in ESR, ripple current ratings, lifetime specifications, and operating temperature ranges while maintaining full mechanical and electrical interchangeability.

Parameter Comparison

Parameter	SLPX331M385H3P3	381LR331M400A022	B43254C9337M000	B43501C9337M000	B43634C5337M000	LQSW6331MELC30
Manufacturer	CDE	CDE	EPCOS - TDK	EPCOS - TDK	EPCOS - TDK	Nichicon
Capacitance (µF)	330	330	330	330	330	330
Voltage Rating (V)	385	400	400	400	450	420
Tolerance	±20%	±20%	±20%	±20%	±20%	±20%
ESR @ Frequency	603 mOhm @ 120Hz	402 mOhm @ 120Hz	Not Specified	200 mOhm @ 100Hz	340 mOhm @ 100Hz	Not Specified
Lifetime @ Temperature	3000 Hrs @ 85°C	3000 Hrs @ 105°C	3000 Hrs @ 105°C	10000 Hrs @ 85°C	8000 Hrs @ 85°C	3000 Hrs @ 105°C
Operating Temperature Range	-25°C to 85°C	-25°C to 105°C	-25°C to 105°C	-40°C to 85°C	-25°C to 85°C	-25°C to 105°C
Ripple Current @ 120 Hz (A)	1.87	1.71	1.33	1.88	Not at 120 Hz	1.42
Ripple Current @ 20 kHz (A)	2.75	2.44	2.062	Not Specified	Not at 20 kHz	2.0306
Lead Spacing (mm)	10.00	10.00	10.00	10.00	10.00	10.00
Case Diameter (mm)	35.00	35.00	35.00	35.00	35.00	35.00
Height - Seated Max (mm)	32.00	32.00	32.00	32.00	32.00	32.00
Package Type	Radial, Can - Snap-In	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	Through Hole
Product Status	Active	Active	Not For New Designs	Not For New Designs	Active	Active
RoHS Status	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant

Engineering Selection Recommendations

Active Status Substitutes (Preferred for New Designs):

The 381LR331M400A022 (CDE), B43634C5337M000 (EPCOS - TDK), and LQSW6331MELC30 (Nichicon) maintain Active product status and are suitable for new design implementations. These parts provide voltage ratings of 400 V, 450 V, and 420 V respectively, all exceeding the original 385 V specification. All three are ROHS3 Compliant and REACH Unaffected.

The 381LR331M400A022 offers improved ESR performance at 402 mOhm compared to the original 603 mOhm, with extended operating temperature range to 105°C and 3000-hour lifetime at that elevated temperature.

The B43634C5337M000 provides the highest voltage rating at 450 V with 340 mOhm ESR and 8000-hour lifetime at 85°C, offering enhanced margin for high-voltage applications.

The LQSW6331MELC30 delivers 420 V rating with 3000-hour lifetime at 105°C and extended high-frequency ripple current capability to 50 kHz.

Legacy Status Substitutes (Existing Designs Only):

The B43254C9337M000 and B43501C9337M000 are designated "Not For New Designs" and should be used only in existing production or maintenance scenarios. The B43501C9337M000 offers superior ESR performance at 200 mOhm and extended 10000-hour lifetime at 85°C, making it suitable for retrofit applications requiring enhanced reliability.

All substitute parts maintain identical mechanical dimensions and through-hole snap-in mounting compatibility with the original SLPX331M385H3P3.

Frequently Asked Questions (FAQ)

Q: Can the SLPX331M385H3P3 be directly replaced with any of these substitute parts?

A: Yes, all listed substitute parts are mechanically and electrically compatible. They share identical capacitance (330 µF), tolerance (±20%), package type (Radial, Can - Snap-In), lead spacing (10.00 mm), case diameter (35.00 mm), height (32.00 mm), and mounting type (Through Hole). All are ROHS3 Compliant and REACH Unaffected.

Q: What is the difference between the voltage ratings?

A: The original SLPX331M385H3P3 is rated at 385 V. Substitute parts are rated at 400 V, 420 V, or 450 V. Higher voltage ratings provide increased safety margin in the same circuit but do not reduce the component's performance at lower voltages. Voltage rating selection depends on circuit maximum operating voltage requirements.

Q: Which substitute offers the best ESR performance?

A: The B43501C9337M000 provides the lowest ESR at 200 mOhm @ 100Hz. The 381LR331M400A022 offers 402 mOhm @ 120Hz. Lower ESR reduces heat generation and improves ripple current handling capability.

Q: Are there temperature range differences I should consider?

A: The original part operates from -25°C to 85°C. The 381LR331M400A022, B43254C9337M000, and LQSW6331MELC30 extend the upper limit to 105°C. The B43501C9337M000 extends the lower limit to -40°C. Selection depends on application thermal environment requirements.

Q: What does "Not For New Designs" mean for B43254C9337M000 and B43501C9337M000?

A: This designation indicates these parts are in legacy status and may have limited future availability. They are suitable for maintaining existing products or repair applications but should not be selected for new product development. Active status parts (381LR331M400A022, B43634C5337M000, LQSW6331MELC30) are recommended for new designs.

Q: Do all substitutes have the same ripple current ratings?

A: No. Ripple current ratings vary across substitutes. The original SLPX331M385H3P3 handles 1.87 A @ 120 Hz and 2.75 A @ 20 kHz. Substitutes range from 1.33 A to 2.1 A @ low frequency. Application ripple current requirements must not exceed the selected substitute's rating.

Q: Can I use a higher voltage-rated capacitor in a 385 V circuit?

A: Yes. A capacitor rated at 400 V, 420 V, or 450 V will function correctly in a 385 V circuit. The higher rating provides additional safety margin. However, the circuit maximum voltage must not exceed the capacitor's rated voltage.

Q: Are all substitutes available in the same package configuration?

A: Yes. All substitute parts use identical Radial, Can - Snap-In package with through-hole mounting, 10.00 mm lead spacing, 35.00 mm case diameter, and 32.00 mm maximum seated height. Direct PCB mounting compatibility is confirmed.

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