SLP331M350H3P3

Part Overview

The SLP331M350H3P3 is a 330 µF, 350 V aluminum electrolytic capacitor in radial, can snap-in package manufactured by Cornell Dubilier Electronics (CDE). This component is classified as Active and suitable for general purpose applications. Alternative equivalent and substitute parts are available with improved voltage ratings (400 V and 420 V) and enhanced electrical characteristics, providing design flexibility for circuit implementations where higher voltage tolerance or superior performance characteristics are required.

Key Parameters

Parameter	Value
Capacitance	330 µF
Tolerance	±20%
Voltage - Rated	350 V
ESR @ 120Hz	1.005 Ohm
Lifetime @ 105°C	3000 Hours
Operating Temperature	-25°C to 105°C
Lead Spacing	0.394" (10.00 mm)
Diameter	1.378" (35.00 mm)
Height (Seated Max)	1.260" (32.00 mm)
Package / Case	Radial, Can - Snap-In
Mounting Type	Through Hole
RoHS Status	ROHS3 Compliant

Substitute Part Grouping Explanation

Substitute components for the SLP331M350H3P3 are qualified based on the following criteria:

Matching Parameters (Required for Substitution):

Capacitance: 330 µF
Tolerance: ±20%
Operating Temperature Range: -25°C to 105°C
Lead Spacing: 0.394" (10.00 mm)
Package Dimensions: 1.378" Dia × 1.260" Height (Max)
Package / Case: Radial, Can - Snap-In
Mounting Type: Through Hole
Lifetime @ 105°C: 3000 Hours
Polarization: Polar

Allowable Variation Parameters:

Voltage - Rated: Substitute parts feature 400 V or 420 V ratings, both exceeding the 350 V requirement and providing higher safety margins
ESR: Variation permitted based on manufacturer specifications; lower ESR values indicate improved performance

The three substitute components meet all dimensional, thermal, and functional requirements while providing upgraded voltage ratings and in certain cases, reduced ESR characteristics.

Parameter Comparison

Parameter	SLP331M350H3P3	381LR331M400A022	B43254C9337M000	LQSW6331MELC30
Manufacturer	CDE	CDE	EPCOS - TDK Electronics	Nichicon
Capacitance	330 µF	330 µF	330 µF	330 µF
Tolerance	±20%	±20%	±20%	±20%
Voltage - Rated	350 V	400 V	400 V	420 V
ESR @ 120Hz	1.005 Ohm	402 mOhm	Not Specified	Not Specified
Ripple Current @ 120 Hz	1.22 A	1.71 A	1.33 A	1.42 A
Ripple Current @ High Frequency	1.79 A @ 20 kHz	2.44 A @ 20 kHz	2.062 A @ 20 kHz	2.0306 A @ 50 kHz
Lifetime @ 105°C	3000 Hours	3000 Hours	3000 Hours	3000 Hours
Operating Temperature	-25°C to 105°C	-25°C to 105°C	-25°C to 105°C	-25°C to 105°C
Lead Spacing	0.394" (10.00 mm)	0.394" (10.00 mm)	0.394" (10.00 mm)	0.394" (10.00 mm)
Size / Dimension	1.378" Dia (35.00 mm)	1.378" Dia (35.00 mm)	1.378" Dia (35.00 mm)	1.378" Dia (35.00 mm)
Height - Seated (Max)	1.260" (32.00 mm)	1.260" (32.00 mm)	1.260" (32.00 mm)	1.260" (32.00 mm)
Package / Case	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
RoHS Status	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant
Product Status	Active	Active	Not For New Designs	Active

Engineering Selection Recommendations

381LR331M400A022 (CDE) is the primary substitute option. This component maintains manufacturer consistency with the original SLP331M350H3P3 while providing a 400 V rated voltage. The enhanced ESR specification of 402 mOhm at 120 Hz offers superior performance characteristics compared to the original part's 1.005 Ohm specification. Product status is Active, confirming ongoing availability and suitability for new designs.

LQSW6331MELC30 (Nichicon) provides the highest voltage rating at 420 V and represents an upgrade path when maximum voltage margin is required. This component is Active for new designs. Ripple current handling is improved across both low and high frequency ranges.

B43254C9337M000 (EPCOS - TDK Electronics) meets all dimensional and electrical requirements with a 400 V rating. However, this component is classified as "Not For New Designs," which restricts its use in new circuit implementations. This part is suitable only for legacy system replacements or maintenance applications where the original specification must be maintained exactly.

Frequently Asked Questions (FAQ)

Q: Can these substitute parts be used in existing designs originally specified with SLP331M350H3P3?

A: Yes. All substitute parts maintain identical physical dimensions, lead spacing, and mounting characteristics. The enhanced voltage ratings (400 V and 420 V) provide higher safety margins in circuits designed for 350 V operation.

Q: What is the significance of the voltage rating differences between the main part and substitutes?

A: The main part features a 350 V rating, while substitutes provide 400 V or 420 V ratings. Higher voltage-rated capacitors can be used in lower-voltage applications without degradation. This allows for design flexibility and potential supply chain optimization.

Q: How do ESR differences affect circuit performance?

A: The 381LR331M400A022 exhibits significantly lower ESR (402 mOhm) compared to the original SLP331M350H3P3 (1.005 Ohm). Lower ESR reduces heat dissipation and improves transient response in applications sensitive to impedance characteristics.

Q: Why is B43254C9337M000 marked as "Not For New Designs"?

A: Product lifecycle status indicates that EPCOS - TDK Electronics has discontinued this component for new applications. It remains available for existing inventory but should not be selected for new circuit designs. Use 381LR331M400A022 or LQSW6331MELC30 for new implementations.

Q: Are all substitute parts RoHS3 compliant?

A: Yes. All components listed, including the main part and all substitutes, meet ROHS3 compliance requirements.

Q: What is the thermal lifetime specification common to all parts?

A: All components share an identical thermal specification: 3000 hours @ 105°C, ensuring consistent reliability across equivalent and substitute options.

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