Equivalent & Substitute Parts for SLPX331M400H3P3

Part Overview

The SLPX331M400H3P3 is a 330 µF, 400 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 suitable for general-purpose applications requiring through-hole mounting with a 10.00 mm lead spacing and 35.00 mm diameter form factor.

Substitute parts become necessary when the primary component experiences supply constraints, extended lead times, or when design requirements permit operation within alternative electrical or thermal specifications. The following equivalent and substitute parts maintain compatibility with the mechanical envelope and core electrical ratings while offering variations in ESR, lifetime ratings, and operating temperature ranges.

Key Parameters

Parameter	Value	Unit	Substitution Relevance
Capacitance	330	µF	Critical - Must match exactly
Voltage - Rated	400	V	Critical - Minimum acceptable rating
Tolerance	±20%	%	Critical - Must match or be tighter
Lead Spacing	10.00	mm	Critical - PCB layout compatibility
Size / Dimension	35.00	mm Dia	Critical - Physical envelope
Height - Seated (Max)	32.00	mm	Critical - Clearance requirement
Package / Case	Radial, Can - Snap-In	-	Critical - Mounting type
Mounting Type	Through Hole	-	Critical - Assembly compatibility
ESR @ 120Hz	603	mOhm	Performance - Lower is better
Lifetime @ Temp.	3000 Hrs @ 85°C	-	Performance - Thermal endurance
Operating Temperature	-25°C ~ 85°C	-	Performance - Thermal range
RoHS Status	ROHS3 Compliant	-	Compliance - Regulatory requirement

Substitute Part Grouping Explanation

Substitution logic for the SLPX331M400H3P3 is based on strict adherence to the following mandatory parameters:

Critical Parameters (Non-Negotiable):

Capacitance: 330 µF (exact match required)
Voltage Rating: 400 V minimum (equal or higher acceptable)
Tolerance: ±20% (equal or tighter acceptable)
Lead Spacing: 10.00 mm (exact match required for PCB compatibility)
Physical Diameter: 35.00 mm (exact match required)
Height (Seated Max): 32.00 mm (exact match required)
Package Type: Radial, Can - Snap-In (exact match required)
Mounting Type: Through Hole (exact match required)

Performance Parameters (Acceptable Variation):

ESR (Equivalent Series Resistance): Lower values indicate improved performance; substitutes with lower ESR are acceptable
Lifetime @ Temperature: Higher values indicate extended operational life; substitutes with equal or greater lifetime are acceptable
Operating Temperature Range: Extended upper temperature limits (105°C vs. 85°C) are acceptable for general-purpose applications

Compliance Parameters:

RoHS Status: ROHS3 Compliant (required for regulatory adherence)
REACH Status: REACH Unaffected (required for regulatory adherence)

All substitute parts listed maintain identical mechanical compatibility and core electrical specifications while offering performance enhancements or extended thermal ratings.

Parameter Comparison

Parameter	SLPX331M400H3P3 (Main)	381LR331M400A022	B43501C9337M000	B43254C9337M000	B43634C5337M000	LQSW6331MELC30
Manufacturer	CDE	CDE	EPCOS - TDK	EPCOS - TDK	EPCOS - TDK	Nichicon
Capacitance	330 µF	330 µF	330 µF	330 µF	330 µF	330 µF
Voltage - Rated	400 V	400 V	400 V	400 V	450 V	420 V
Tolerance	±20%	±20%	±20%	±20%	±20%	±20%
ESR @ Reference Frequency	603 mOhm @ 120Hz	402 mOhm @ 120Hz	200 mOhm @ 100Hz	Not specified	340 mOhm @ 100Hz	Not specified
Lifetime @ Temperature	3000 Hrs @ 85°C	3000 Hrs @ 105°C	10000 Hrs @ 85°C	3000 Hrs @ 105°C	8000 Hrs @ 85°C	3000 Hrs @ 105°C
Operating Temperature Range	-25°C ~ 85°C	-25°C ~ 105°C	-40°C ~ 85°C	-25°C ~ 105°C	-25°C ~ 85°C	-25°C ~ 105°C
Lead Spacing	10.00 mm	10.00 mm	10.00 mm	10.00 mm	10.00 mm	10.00 mm
Size / Dimension	35.00 mm Dia	35.00 mm Dia	35.00 mm Dia	35.00 mm Dia	35.00 mm Dia	35.00 mm Dia
Height - Seated (Max)	32.00 mm	32.00 mm	32.00 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	Radial, Can - Snap-In
Mounting Type	Through Hole	Through Hole	Through Hole	Through Hole	Through Hole	Through Hole
RoHS Status	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant
Product Status	Active	Active	Not For New Designs	Not For New Designs	Active	Active

Engineering Selection Recommendations

Primary Recommendation - Direct Equivalent:

The 381LR331M400A022 (Cornell Dubilier Electronics) is the preferred direct substitute for the SLPX331M400H3P3. Both components are manufactured by CDE, share identical mechanical specifications, and maintain the same 330 µF / 400 V rating. The 381LR series offers improved ESR performance (402 mOhm vs. 603 mOhm @ 120Hz) and extended operating temperature range (-25°C ~ 105°C), providing superior thermal margin. Product status is Active, ensuring long-term availability and continued manufacturing support.

Secondary Recommendations - Performance-Enhanced Substitutes:

The B43634C5337M000 (EPCOS - TDK Electronics) provides a voltage-rated upgrade to 450 V while maintaining all mechanical compatibility. This component is suitable for applications requiring additional voltage margin. Product status is Active. ESR is 340 mOhm @ 100Hz, representing a 44% improvement over the main part.

The LQSW6331MELC30 (Nichicon) offers a 420 V voltage rating with extended thermal capability (3000 Hrs @ 105°C). This component is suitable for applications operating in elevated ambient temperature environments. Product status is Active.

Alternative Substitutes - Legacy Status:

The B43501C9337M000 (EPCOS - TDK Electronics) and B43254C9337M000 (EPCOS - TDK Electronics) are listed with "Not For New Designs" product status. These components are suitable only for replacement or repair of existing equipment. The B43501C9337M000 offers superior ESR performance (200 mOhm @ 100Hz) and extended lifetime (10000 Hrs @ 85°C), but should not be selected for new product development.

Compliance Verification:

All substitute parts maintain ROHS3 compliance and REACH Unaffected status, meeting regulatory requirements for industrial and commercial applications.

Frequently Asked Questions (FAQ)

Q1: Can I substitute the SLPX331M400H3P3 with a higher voltage-rated capacitor such as the B43634C5337M000 (450 V)?

A: Yes. The B43634C5337M000 is mechanically and electrically compatible. Higher voltage ratings provide additional safety margin in the circuit. All other critical parameters (capacitance, tolerance, lead spacing, physical dimensions, package type, and mounting method) are identical. The 450 V rating is acceptable for applications designed for 400 V operation.

Q2: What is the difference between the 381LR331M400A022 and the SLPX331M400H3P3?

A: Both components are manufactured by Cornell Dubilier Electronics and share identical mechanical specifications and core electrical ratings (330 µF, 400 V, ±20% tolerance). The 381LR series offers improved ESR (402 mOhm vs. 603 mOhm @ 120Hz) and extended operating temperature range (-25°C ~ 105°C vs. -25°C ~ 85°C). The 381LR331M400A022 is the recommended direct substitute.

Q3: Why are some substitute parts marked "Not For New Designs"?

A: Product status "Not For New Designs" indicates that the manufacturer has discontinued active development and marketing of that component line. These parts remain available for replacement and repair of existing equipment but should not be selected for new product development. For new designs, select components with "Active" product status: 381LR331M400A022, B43634C5337M000, or LQSW6331MELC30.

Q4: Are all substitute parts physically interchangeable with the SLPX331M400H3P3?

A: Yes. All listed substitute parts maintain identical mechanical specifications: 35.00 mm diameter, 32.00 mm maximum seated height, 10.00 mm lead spacing, radial can snap-in package, and through-hole mounting. Direct PCB substitution is possible without layout modification.

Q5: What does ESR (Equivalent Series Resistance) mean, and why does it vary among substitutes?

A: ESR represents the internal resistance of the capacitor at a specified frequency. Lower ESR values indicate better performance, particularly in high-ripple-current applications. The SLPX331M400H3P3 has 603 mOhm @ 120Hz, while the B43501C9337M000 has 200 mOhm @ 100Hz. Lower ESR reduces heat generation and improves circuit efficiency. Substitutes with lower ESR are acceptable and provide performance enhancement.

Q6: Can I use the LQSW6331MELC30 (420 V) instead of the SLPX331M400H3P3 (400 V)?

A: Yes. The LQSW6331MELC30 is rated for 420 V, which exceeds the 400 V requirement. Higher voltage ratings provide additional safety margin. All mechanical specifications are identical. This component is suitable for applications requiring extended thermal capability (3000 Hrs @ 105°C).

Q7: What is the significance of the operating temperature range difference between substitutes?

A: Operating temperature range defines the ambient conditions under which the capacitor functions within specification. The SLPX331M400H3P3 operates from -25°C to 85°C. Substitutes such as the 381LR331M400A022 extend the upper limit to 105°C, providing thermal margin for applications in elevated ambient environments. Extended temperature range does not affect compatibility in standard temperature applications.

Q8: Are all substitute parts RoHS3 compliant?

A: Yes. All listed substitute parts are ROHS3 Compliant and REACH Unaffected, meeting regulatory requirements for industrial, commercial, and consumer applications in regions with environmental compliance mandates.

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