SLP181M350C3P3 Equivalent & Substitute Parts

Part Overview

The SLP181M350C3P3 is a 180 µF, 350 V aluminum electrolytic capacitor manufactured by Cornell Dubilier Electronics (CDE) in a radial, can snap-in package. This component is rated for general-purpose applications with an operating temperature range of -25°C to 105°C and a lifetime specification of 3000 hours at 105°C. The part is Active in product status and RoHS3 compliant.

Substitute parts are identified when equivalent capacitance and tolerance values are maintained while accommodating variations in voltage rating, lifetime specifications, and manufacturer design characteristics. Alternative components may be required due to inventory availability, extended lifetime requirements, or enhanced voltage margin specifications for system reliability.

Key Parameters

Parameter	Value	Unit
Capacitance	180	µF
Tolerance	±20%	-
Voltage - Rated	350	V
ESR @ 120Hz	1.843	Ohm
Lifetime @ 105°C	3000	Hrs
Operating Temperature Range	-25 to 105	°C
Ripple Current @ 120 Hz	920	mA
Ripple Current @ 20 kHz	1.35	A
Lead Spacing	10.00	mm
Diameter	25.00	mm
Height - Seated (Max)	32.00	mm
Mounting Type	Through Hole	-
Package / Case	Radial, Can - Snap-In	-
RoHS Status	ROHS3 Compliant	-
Polarization	Polar	-

Substitute Part Grouping Explanation

Substitution of the SLP181M350C3P3 is determined by strict adherence to the following electrical and mechanical parameters:

Critical Parameters (Must Match):

Capacitance: 180 µF
Tolerance: ±20%
Polarization: Polar
Mounting Type: Through Hole
Package / Case: Radial, Can - Snap-In
Lead Spacing: 10.00 mm (0.394")
Physical Dimensions: 25.00 mm diameter, 32.00 mm height maximum

Allowable Variation Parameters:

Voltage - Rated: Substitute parts rated at 350 V or higher are acceptable
Lifetime @ 105°C: Substitute parts rated at 3000 hours or longer are acceptable
Operating Temperature Range: Substitute parts with -25°C to 105°C or extended lower temperature limits are acceptable
Ripple Current: Substitute parts with equal or higher ripple current ratings are acceptable
ESR: Substitute parts with equal or lower ESR values are acceptable
Manufacturer: Any qualified manufacturer producing equivalent specifications

All substitute parts listed maintain identical capacitance, tolerance, polarization, and mechanical form factor. Voltage ratings of 400 V, 420 V, and 450 V provide enhanced voltage margin over the 350 V specification. Extended lifetime ratings of 5000 hours provide improved reliability over the 3000-hour baseline.

Parameter Comparison

Part Number	Manufacturer	Capacitance (µF)	Tolerance	Voltage (V)	Lifetime @ 105°C (Hrs)	Operating Temp (°C)	Ripple Current @ 120 Hz (mA)	Lead Spacing (mm)	Diameter (mm)	Height (mm)	RoHS Status
SLP181M350C3P3	Cornell Dubilier	180	±20%	350	3000	-25 to 105	920	10.00	25.00	32.00	ROHS3
450VXH180MEFCSN25X30	Rubycon	180	±20%	450	5000	-25 to 105	1190	10.00	25.00	32.00	ROHS3
ELHS451VSN181MQ30S	Chemi-Con	180	±20%	450	5000	-40 to 105	1050	10.00	25.40	32.50	RoHS
LGN2G181MELA30	Nichicon	180	±20%	400	3000	-25 to 105	950	10.00	25.00	32.00	ROHS3
LGNW6181MELA30	Nichicon	180	±20%	420	3000	-25 to 105	910	10.00	25.00	32.00	ROHS3
LGX2G181MELA30	Nichicon	180	±20%	400	5000	-25 to 105	970	10.00	25.00	32.00	ROHS3
LQSW6181MELA30	Nichicon	180	±20%	420	3000	-25 to 105	910	10.00	25.00	32.00	ROHS3

Engineering Selection Recommendations

Voltage Rating Considerations:

The SLP181M350C3P3 operates at 350 V rated voltage. Substitute parts with higher voltage ratings (400 V, 420 V, 450 V) provide increased voltage margin and are electrically compatible in applications where the original 350 V specification is required. Higher voltage-rated capacitors do not degrade performance in lower-voltage applications.

Lifetime and Reliability:

The original part specifies 3000 hours at 105°C. Substitute parts offering 5000-hour lifetime ratings (450VXH180MEFCSN25X30, ELHS451VSN181MQ30S, LGX2G181MELA30) provide extended operational life and improved reliability margins. Parts with matching 3000-hour specifications (LGN2G181MELA30, LGNW6181MELA30, LQSW6181MELA30) maintain equivalent reliability characteristics.

Compliance and Certifications:

All substitute parts are RoHS compliant. The original part carries ROHS3 certification. Substitute parts ELHS451VSN181MQ30S carries RoHS certification. All parts are REACH Unaffected and classified as EAR99 for export control purposes.

Physical Compatibility:

All substitute parts maintain the critical mechanical parameters: 10.00 mm lead spacing, 25.00 mm diameter (with ELHS451VSN181MQ30S at 25.40 mm), and 32.00 mm height maximum (with ELHS451VSN181MQ30S at 32.50 mm). These minor dimensional variations remain within standard PCB layout tolerances for through-hole snap-in capacitor mounting.

Manufacturer Selection:

Rubycon (450VXH180MEFCSN25X30), Chemi-Con (ELHS451VSN181MQ30S), and Nichicon (LGN, LGX, LQS series) are established manufacturers of aluminum electrolytic capacitors meeting industrial reliability standards.

Frequently Asked Questions (FAQ)

Q: Can I substitute a 450 V rated capacitor for the original 350 V part?

A: Yes. A 450 V rated capacitor is electrically compatible in an application designed for 350 V operation. The higher voltage rating provides additional safety margin without affecting circuit performance. The capacitance value, tolerance, and physical form factor remain identical.

Q: What is the difference between 3000-hour and 5000-hour lifetime ratings?

A: Lifetime rating indicates the expected operational duration at maximum rated temperature (105°C) before capacitance degradation reaches specified limits. A 5000-hour rating provides extended service life compared to 3000 hours. Both ratings are acceptable for the same application; the 5000-hour specification offers improved reliability margin.

Q: Are all substitute parts mechanically interchangeable?

A: All substitute parts share the same lead spacing (10.00 mm) and mounting type (through-hole snap-in). Physical dimensions are nominally identical: 25.00 mm diameter and 32.00 mm height. The ELHS451VSN181MQ30S exhibits minor dimensional variations (25.40 mm diameter, 32.50 mm height) that remain within standard PCB layout tolerances for snap-in capacitor mounting.

Q: Which substitute part should I select for maximum reliability?

A: Selection depends on application requirements. For extended operational life, choose parts with 5000-hour ratings: 450VXH180MEFCSN25X30 (Rubycon), ELHS451VSN181MQ30S (Chemi-Con), or LGX2G181MELA30 (Nichicon). For voltage margin enhancement, select 450VXH180MEFCSN25X30 or ELHS451VSN181MQ30S. For equivalent specifications matching the original part, select LGN2G181MELA30 or LQSW6181MELA30.

Q: Are there temperature range differences between substitute parts?

A: The original SLP181M350C3P3 and most substitute parts operate from -25°C to 105°C. The ELHS451VSN181MQ30S extends the lower temperature limit to -40°C, providing operation in colder environments. This extended range does not affect performance in standard -25°C to 105°C applications.

Q: What is ESR and why does it matter?

A: Equivalent Series Resistance (ESR) represents the internal resistance of the capacitor at a specified frequency. Lower ESR values indicate better high-frequency performance and reduced heat generation. The original part specifies 1.843 Ohm ESR at 120 Hz. Substitute parts with equal or lower ESR values maintain or improve performance characteristics.

Q: Can I use these capacitors interchangeably in production?

A: All substitute parts maintain identical capacitance (180 µF), tolerance (±20%), polarization, and mechanical form factor. They are functionally equivalent for general-purpose applications. Verify that voltage rating, lifetime specification, and operating temperature range meet your specific application requirements before implementation.

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