SLP331M385E4P3 Equivalent & Substitute Parts Reference

Part Overview

The SLP331M385E4P3 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 in power supply circuits.

Substitute parts become necessary when the original component reaches end-of-life inventory status, when design requirements shift to higher voltage ratings for improved safety margins, or when alternative manufacturers offer superior electrical characteristics such as lower equivalent series resistance (ESR) or extended operating temperature ranges.

Key Parameters

Parameter	Value	Unit	Substitution Criticality
Capacitance	330	µF	Critical - Must Match
Voltage Rating (Minimum)	385	V	Critical - Must Equal or Exceed
Tolerance	±20%	%	Critical - Must Match
Package Type	Radial, Can - Snap-In	-	Critical - Must Match
Lead Spacing	10.00	mm	Critical - Must Match
Diameter	30.00	mm	Critical - Must Match
Height (Seated Max)	47.00	mm	Critical - Must Match
Mounting Type	Through Hole	-	Critical - Must Match
Lifetime @ Temperature	3000	Hrs @ 105°C	Important - Should Match or Exceed
Operating Temperature Range	-25°C to 105°C	-	Important - Should Match or Exceed
Polarization	Polar	-	Critical - Must Match
RoHS Status	ROHS3 Compliant	-	Important - Regulatory Compliance

Substitute Part Grouping Explanation

Substitution logic for the SLP331M385E4P3 is based on strict electrical and mechanical parameter matching within the aluminum electrolytic capacitor category:

Critical Matching Parameters:

Capacitance value: 330 µF (exact match required)
Tolerance: ±20% (exact match required)
Package configuration: Radial, Can - Snap-In (exact match required)
Lead spacing: 10.00 mm (exact match required)
Physical dimensions: 30.00 mm diameter × 47.00 mm height seated (exact match required)
Mounting type: Through Hole (exact match required)
Polarization: Polar (exact match required)

Voltage Rating Substitution Rule: Substitute parts must have a rated voltage equal to or greater than 385 V. Higher voltage ratings provide improved safety margins and are electrically compatible in circuits designed for 385 V operation.

Performance Enhancement Parameters: Substitute parts may offer improved ESR (lower values), extended operating temperature ranges, or longer lifetime ratings. These enhancements do not compromise compatibility but provide superior performance characteristics.

Regulatory Compliance: All substitute parts must maintain ROHS3 compliance and REACH unaffected status to ensure regulatory alignment with the original component.

Parameter Comparison

Parameter	SLP331M385E4P3 (Main)	381LX331M400K452 (Substitute)	B43504A9337M000 (Substitute)
Manufacturer	Cornell Dubilier Electronics	Cornell Dubilier Electronics	EPCOS - TDK Electronics
Capacitance	330 µF	330 µF	330 µF
Tolerance	±20%	±20%	±20%
Voltage Rating	385 V	400 V	400 V
ESR @ Reference Frequency	1.005 Ω @ 120 Hz	Not Specified	270 mΩ @ 100 Hz
Lifetime @ 105°C	3000 Hrs	3000 Hrs	3000 Hrs
Operating Temperature Range	-25°C to 105°C	-25°C to 105°C	-40°C to 105°C
Ripple Current @ 120 Hz	1.31 A	1.4 A	1.5 A @ 100 Hz
Ripple Current @ 20 kHz	1.93 A	1.9 A	Not Specified
Lead Spacing	10.00 mm	10.00 mm	10.00 mm
Diameter	30.00 mm	30.00 mm	30.00 mm
Height (Seated Max)	47.00 mm	47.00 mm	47.00 mm
Package Type	Radial, Can - Snap-In	Radial, Can - Snap-In	Radial, Can - Snap-In
Mounting Type	Through Hole	Through Hole	Through Hole
Product Status	Active	Active	Not For New Designs
RoHS Status	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant
Moisture Sensitivity Level	1 (Unlimited)	1 (Unlimited)	1 (Unlimited)

Engineering Selection Recommendations

381LX331M400K452 (Cornell Dubilier Electronics): This substitute is recommended as the primary alternative. It maintains identical mechanical dimensions, lead spacing, and package configuration. The voltage rating is increased to 400 V, providing a 15 V safety margin above the original 385 V specification. Product status is Active, ensuring continued availability and manufacturing support. ROHS3 compliance and unlimited moisture sensitivity level align with regulatory requirements. Ripple current ratings at both 120 Hz (1.4 A) and 20 kHz (1.9 A) are equivalent to or exceed the original component specifications.

B43504A9337M000 (EPCOS - TDK Electronics): This substitute offers superior electrical performance characteristics, including significantly lower ESR (270 mΩ @ 100 Hz compared to 1.005 Ω @ 120 Hz in the original). The extended operating temperature range (-40°C to 105°C) provides improved performance in cold-start applications. Voltage rating of 400 V exceeds the original specification. However, product status is classified as "Not For New Designs," indicating this component is in mature or declining production phase. This substitute is suitable for replacement applications in existing designs but should not be selected for new product development. Inventory availability is significantly higher (134,200 pcs) compared to other options.

Both substitutes maintain full mechanical and electrical compatibility with the SLP331M385E4P3 within the specified parameter tolerances and regulatory compliance framework.

Frequently Asked Questions (FAQ)

Q: Can I use a 400 V rated capacitor in a circuit designed for 385 V operation?

A: Yes. Higher voltage-rated capacitors are electrically compatible in circuits designed for lower voltages. The 400 V rating provides a safety margin and does not compromise circuit functionality. The capacitor will operate within its specified electrical parameters.

Q: What is the significance of the "Not For New Designs" status on the B43504A9337M000?

A: This designation indicates the component is in mature production phase with no active development or enhancement roadmap. It remains fully functional and compliant with all specifications. This status is relevant only for new product development decisions. For replacement or retrofit applications in existing designs, this component is technically suitable.

Q: Are the physical dimensions identical across all three parts?

A: Yes. All three components share identical mechanical specifications: 30.00 mm diameter, 47.00 mm seated height, and 10.00 mm lead spacing. They are mechanically interchangeable in snap-in mounting applications.

Q: What does ESR (Equivalent Series Resistance) mean for capacitor selection?

A: ESR represents the internal resistance of the capacitor at a specified frequency. Lower ESR values indicate better high-frequency performance and reduced heat generation under ripple current conditions. The B43504A9337M000 exhibits significantly lower ESR (270 mΩ) compared to the SLP331M385E4P3 (1.005 Ω), providing superior performance in switching power supplies and high-frequency filtering applications.

Q: Do all substitute parts maintain the same 3000-hour lifetime rating at 105°C?

A: Yes. All three components are rated for 3000 hours of operation at 105°C, ensuring equivalent reliability and service life expectations in thermal stress conditions.

Q: Are there any compliance or regulatory differences between the main part and substitutes?

A: No. All three components are ROHS3 compliant, REACH unaffected, and classified as Moisture Sensitivity Level 1 (Unlimited). They meet identical regulatory and environmental standards.

Q: Can I substitute based on capacitance value alone?

A: No. Substitution requires matching all critical parameters: capacitance (330 µF), tolerance (±20%), voltage rating (minimum 385 V), package type (Radial, Can - Snap-In), lead spacing (10.00 mm), physical dimensions (30.00 mm × 47.00 mm), and mounting type (Through Hole). Partial parameter matching may result in mechanical or electrical incompatibility.

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