SLP121M450C3P3 Equivalent & Substitute Parts

Part Overview

The SLP121M450C3P3 is a 120 µF, 450 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 a 3000-hour lifetime at 105°C and an operating temperature range of -25°C to 105°C. The part is currently Active in product status and ROHS3 compliant.

Substitute parts are necessary when the primary part experiences supply constraints, inventory limitations, or when design flexibility permits selection from multiple qualified manufacturers. The substitute parts listed maintain electrical and mechanical compatibility within the specified parameter tolerances for this capacitor category.

Substiute Parts

SLP121M450C3P3

Cornell Dubilier Electronics (CDE)In Stock: 898SLP121M450C3P3 Datasheet

Current PartRFQ

450MXG120MEFCSN25X25

RubyconIn Stock: 4245450MXG120MEFCSN25X25 Datasheet

DirectRFQ

B43254B5127M000

EPCOS - TDK ElectronicsIn Stock: 878B43254B5127M000 Datasheet

DirectRFQ

LGX2W121MELA30

NichiconIn Stock: 1289LGX2W121MELA30 Datasheet

DirectRFQ

B43548A5127M060

EPCOS - TDK ElectronicsIn Stock: 274016B43548A5127M060 Datasheet

Parametric EquivalentRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution eligibility for the SLP121M450C3P3 is determined by strict adherence to the following parameters:

Critical Matching Parameters:

• Capacitance: 120 µF (exact match required)
• Tolerance: ±20% (exact match required)
• Voltage Rating: 450 V (exact match required)
• Polarization: Polar (exact match required)
• Mounting Type: Through Hole (exact match required)
• Package Type: Radial, Can - Snap-In (exact match required)
• Lead Spacing: 0.394 inches / 10.00 mm (exact match required)

Compatible Variation Parameters:

• Lifetime @ 105°C: 3000 hours or greater
• Operating Temperature Range: -25°C to 105°C or wider
• Physical Dimensions: Within mechanical envelope constraints
• ESR and Ripple Current: May vary within application requirements
• Manufacturer: Different manufacturers permitted

All substitute parts listed maintain these critical parameters. Variations in ESR, ripple current ratings, and lifetime specifications are documented in the parameter comparison table.

Parameter Comparison

Engineering Selection Recommendations

Primary Selection (Active Status, Current Production):

The 450MXG120MEFCSN25X25 (Rubycon MXG series) is recommended as the first substitute option. This part maintains all critical electrical and mechanical parameters, is in Active product status, and offers higher ripple current capability at 120 Hz (950 mA versus 800 mA). The reduced height (1.063 inches versus 1.260 inches) provides additional mechanical flexibility in board layout.

The LGX2W121MELA30 (Nichicon LGX series) is recommended as a secondary substitute option. This part is in Active product status and offers extended lifetime (5000 hours at 105°C versus 3000 hours), providing enhanced reliability margin for long-term applications. Physical dimensions match the primary part exactly.

The B43548A5127M060 (EPCOS - TDK B43548 series) is recommended as a tertiary substitute option. This part is in Active product status and offers significantly lower ESR (680 mOhm @ 100 Hz versus 2.765 Ohm @ 120 Hz), resulting in superior high-frequency performance and reduced thermal dissipation. Ripple current capability is substantially higher (1.19 A @ 100 Hz).

Not Recommended for New Designs:

The B43254B5127M000 (EPCOS - TDK B43254 series) carries a "Not For New Designs" product status designation. While electrically and mechanically compatible, this part should not be selected for new circuit designs. Existing designs currently using this part may continue operation, but migration to an Active-status substitute is recommended for long-term supply assurance.

Compliance Verification:

All recommended substitute parts are ROHS3 compliant and REACH unaffected, matching the regulatory status of the primary part SLP121M450C3P3.

Frequently Asked Questions (FAQ)

Q: Can the 450MXG120MEFCSN25X25 be used as a direct replacement for the SLP121M450C3P3?

A: Yes. The 450MXG120MEFCSN25X25 maintains all critical electrical parameters (120 µF, ±20%, 450 V) and mechanical specifications (radial snap-in package, 10.00 mm lead spacing, 25.00 mm diameter). The reduced height (27.00 mm versus 32.00 mm) is a mechanical advantage that does not affect electrical compatibility. Both parts are rated for -25°C to 105°C operation and 3000-hour lifetime at 105°C.

Q: What is the difference between the LGX2W121MELA30 and the SLP121M450C3P3?

A: The LGX2W121MELA30 differs in two aspects: (1) Extended lifetime rating of 5000 hours at 105°C compared to 3000 hours, and (2) Moisture Sensitivity Level is listed as Not Applicable versus Level 1 (Unlimited) for the primary part. All other electrical and mechanical parameters are identical. The extended lifetime provides additional operational margin for applications requiring extended service life.

Q: Why is the B43254B5127M000 marked "Not For New Designs"?

A: The B43254B5127M000 carries a "Not For New Designs" product status, indicating that the manufacturer (EPCOS - TDK Electronics) has discontinued active development and production planning for this part. While existing inventory is available and the part remains electrically and mechanically compatible, new circuit designs should select from Active-status alternatives such as the 450MXG120MEFCSN25X25, LGX2W121MELA30, or B43548A5127M060 to ensure long-term supply continuity.

Q: What does the lower ESR of the B43548A5127M060 mean for circuit performance?

A: The B43548A5127M060 has an ESR of 680 mOhm @ 100 Hz compared to 2.765 Ohm @ 120 Hz for the SLP121M450C3P3. Lower ESR reduces voltage drop across the capacitor during current transients and decreases thermal dissipation. This characteristic is beneficial in high-ripple-current applications and power supply filtering circuits where thermal management is critical. The B43548A5127M060 also demonstrates higher ripple current capability (1.19 A @ 100 Hz).

Q: Are all substitute parts physically compatible with existing PCB layouts designed for the SLP121M450C3P3?

A: Physical compatibility depends on specific board layout constraints. All substitute parts share the same lead spacing (10.00 mm) and diameter (25.00 mm or 25.40 mm for the B43254B5127M000). The primary dimensional variation is height: the 450MXG120MEFCSN25X25 is shorter (27.00 mm versus 32.00 mm), which is mechanically advantageous. The B43254B5127M000 and LGX2W121MELA30 match the original height (32.00 mm). The B43548A5127M060 also matches the original height. Verify clearance above the capacitor in your specific board design before substitution.

Q: What is the significance of the different ripple current ratings among the substitute parts?

A: Ripple current rating indicates the maximum AC current the capacitor can handle at a specified frequency without exceeding temperature limits. The SLP121M450C3P3 is rated for 800 mA @ 120 Hz and 1.18 A @ 20 kHz. The 450MXG120MEFCSN25X25 offers higher ripple current (950 mA @ 120 Hz, 1.33 A @ 10 kHz), while the B43254B5127M000 offers lower ripple current (500 mA @ 120 Hz, 775 mA @ 20 kHz). Select a substitute with ripple current rating equal to or greater than the application requirement to prevent premature capacitor failure due to thermal stress.

Q: Can substitute parts be mixed in the same circuit design?

A: All listed substitute parts are electrically equivalent and can be used interchangeably within a single circuit design. However, for manufacturing consistency and supply chain management, it is recommended to standardize on a single substitute part number per design revision to simplify procurement, inventory control, and field service documentation.

Q: What compliance certifications apply to all substitute parts?

A: All substitute parts listed (450MXG120MEFCSN25X25, B43254B5127M000, LGX2W121MELA30, and B43548A5127M060) are ROHS3 compliant and REACH unaffected, matching the regulatory status of the primary part SLP121M450C3P3. These certifications confirm compliance with European Union Restriction of Hazardous Substances Directive 3 and REACH (Registration, Evaluation, Authorization and Restriction of Chemicals) regulations.