SLPX121M350A1P3 Equivalent and Substitute Parts

Part Overview

The SLPX121M350A1P3 is a 120 µF 350 V aluminum electrolytic capacitor manufactured by Cornell Dubilier Electronics (CDE) in a radial, can-style snap-in package. This polarized capacitor is rated for general-purpose applications with a ±20% capacitance tolerance and an operating temperature range of -25°C to 85°C. The component is RoHS3 compliant and currently active in product status. Substitute parts may be required due to supply availability, procurement lead times, or application-specific performance requirements within compatible parameter ranges.

Substiute Parts

SLPX121M350A1P3

Cornell Dubilier Electronics (CDE)In Stock: 975SLPX121M350A1P3 Datasheet

Current PartRFQ

400USG120MEFCSN22X25

RubyconIn Stock: 825400USG120MEFCSN22X25 Datasheet

UpgradeRFQ

B43642A9127M000

EPCOS - TDK ElectronicsIn Stock: 1708B43642A9127M000 Datasheet

UpgradeRFQ

LQS2V121MELZ25

NichiconIn Stock: 1033LQS2V121MELZ25 Datasheet

UpgradeRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution for the SLPX121M350A1P3 is determined by electrical and mechanical compatibility within the following critical parameters:

Mandatory Compatibility Criteria:

• Capacitance: 120 µF (±20% tolerance)
• Voltage Rating: ≥350 V (rated voltage equal to or exceeding the original)
• Package: Radial, Can - Snap-In configuration
• Lead Spacing: 0.394" (10.00 mm)
• Physical Dimensions: 0.866" Dia (22.00 mm) × 1.063" Height (27.00 mm)
• Mounting Type: Through Hole
• Polarization: Polar

Performance Parameters:

• Operating Temperature Range: Compatible with -25°C to 85°C minimum
• Lifetime Rating: 3000 Hrs @ rated temperature (or higher)
• Ripple Current Ratings: Adequate for application requirements

The three substitute parts meet these electrical and mechanical criteria. Two substitutes (400USG120MEFCSN22X25 and B43642A9127M000) provide voltage ratings at 400 V, which exceeds the original 350 V specification. One substitute (LQS2V121MELZ25) matches the exact 350 V rating while offering enhanced temperature stability.

Parameter Comparison

Engineering Selection Recommendations

All four parts meet RoHS3 compliance and are active in product status. The following considerations apply based on provided technical specifications:

400USG120MEFCSN22X25 (Rubycon USG Series): This upgrade substitute offers 400 V rated voltage with identical physical packaging and lead spacing. It maintains the same 3000-hour lifetime at 85°C and provides slightly elevated ripple current capability at 120 Hz (1.08 A). This part is suitable for applications where higher voltage headroom is beneficial without operational constraint.

B43642A9127M000 (EPCOS - TDK B43642 Series): This upgrade substitute features 400 V rated voltage with extended operating temperature range (-40°C to 105°C) and extended lifetime rating (3000 Hrs @ 105°C). The ESR specification is 0.830 Ω at 100 Hz, which is lower than the original part's 1.66 Ω at 120 Hz. Inventory availability is highest among substitutes at 1667 pieces.

LQS2V121MELZ25 (Nichicon LQS Series): This substitute maintains the exact 350 V voltage rating of the original part while providing extended operating temperature range (-25°C to 105°C) and 3000-hour lifetime at 105°C. Physical dimensions and lead spacing are identical to the original specification.

Frequently Asked Questions (FAQ)

Q: Can I substitute any of these parts directly for the SLPX121M350A1P3?

A: Yes, all three substitute parts are electrically and mechanically compatible with the original SLPX121M350A1P3. They maintain identical capacitance (120 µF), physical dimensions (0.866" diameter × 1.063" height), lead spacing (10.00 mm), and package configuration (Radial, Can - Snap-In). All are polar aluminum electrolytic capacitors rated for through-hole mounting.

Q: What is the difference between the 350 V and 400 V rated substitutes?

A: The Rubycon 400USG120MEFCSN22X25 and EPCOS B43642A9127M000 provide a higher voltage rating (400 V) compared to the original 350 V. A higher voltage rating provides additional electrical margin in the circuit and does not affect functionality in 350 V applications. The Nichicon LQS2V121MELZ25 maintains the original 350 V rating.

Q: How do the operating temperature ranges differ?

A: The original SLPX121M350A1P3 operates from -25°C to 85°C. The EPCOS B43642A9127M000 extends this to -40°C to 105°C, and the Nichicon LQS2V121MELZ25 extends to -25°C to 105°C. The Rubycon 400USG120MEFCSN22X25 maintains the -25°C to 85°C range.

Q: Are all parts RoHS3 compliant?

A: Yes, all four parts, including the original SLPX121M350A1P3 and the three substitutes, are RoHS3 compliant.

Q: What is the significance of ESR (Equivalent Series Resistance)?

A: ESR affects capacitor performance in high-frequency applications. The original SLPX121M350A1P3 has an ESR of 1.66 Ω at 120 Hz. The EPCOS B43642A9127M000 provides a lower ESR of 0.830 Ω at 100 Hz, which may reduce heat dissipation in ripple-current-intensive applications. ESR specifications are not provided for the Rubycon and Nichicon substitutes in the available data.

Q: Can these parts be used interchangeably on the same PCB?

A: Yes, all parts have identical lead spacing (0.394" / 10.00 mm) and physical dimensions (0.866" diameter × 1.063" height maximum), enabling direct PCB footprint compatibility without layout modifications.