SLP121M350A3P3 Equivalent & Substitute Parts Reference

Part Overview

The SLP121M350A3P3 is a 120 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, tolerance, package type, mounting configuration, and mechanical dimensions are maintained while voltage rating, ESR characteristics, or thermal lifetime may be upgraded to meet enhanced system requirements.

Substiute Parts

SLP121M350A3P3

Cornell Dubilier Electronics (CDE)In Stock: 1234SLP121M350A3P3 Datasheet

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400HXG120MEFCSN22X30

RubyconIn Stock: 1270400HXG120MEFCSN22X30 Datasheet

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400MXG120MEFCSN22X30

RubyconIn Stock: 866400MXG120MEFCSN22X30 Datasheet

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450MXG120MEFCSN22X30

RubyconIn Stock: 1465450MXG120MEFCSN22X30 Datasheet

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450VXH120MEFCSN22X30

RubyconIn Stock: 996450VXH120MEFCSN22X30 Datasheet

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LQS2G121MELZ30

NichiconIn Stock: 661LQS2G121MELZ30 Datasheet

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Key Parameters

Substitute Part Grouping Explanation

Substitute parts for the SLP121M350A3P3 are qualified based on the following criteria:

Mandatory Matching Parameters:

• Capacitance: 120 µF
• Tolerance: ±20%
• Package / Case: Radial, Can - Snap-In
• Lead Spacing: 0.394" (10.00 mm)
• Size / Dimension: 0.866" Dia (22.00 mm)
• Height - Seated (Max): 1.260" (32.00 mm)
• Mounting Type: Through Hole
• Polarization: Polar
• Operating Temperature: -25°C ~ 105°C
• RoHS Status: ROHS3 Compliant

Allowable Upgrade Parameters:

• Voltage - Rated: Equal or higher than 350 V
• Lifetime @ Temp.: Equal or higher than 3000 Hrs @ 105°C

Five substitute parts meet these criteria, manufactured by Rubycon and Nichicon. These substitutes maintain identical mechanical and electrical core specifications while offering voltage ratings of 400 V or 450 V and thermal lifetimes of 3000 or 5000 hours at 105°C.

Parameter Comparison

Engineering Selection Recommendations

All substitute parts listed maintain Active product status and RoHS3 compliance, ensuring regulatory alignment with the original SLP121M350A3P3 component.

Voltage Rating Selection:

• 400 V rated substitutes (400HXG120MEFCSN22X30, 400MXG120MEFCSN22X30, LQS2G121MELZ30) provide a 50 V margin above the original 350 V specification.
• 450 V rated substitutes (450MXG120MEFCSN22X30, 450VXH120MEFCSN22X30) provide a 100 V margin above the original specification.

Thermal Lifetime Selection:

• Parts with 3000 Hrs @ 105°C (400HXG120MEFCSN22X30, 400MXG120MEFCSN22X30, 450MXG120MEFCSN22X30, LQS2G121MELZ30) match the original lifetime specification.
• The 450VXH120MEFCSN22X30 offers extended thermal lifetime of 5000 Hrs @ 105°C for applications requiring enhanced durability.

Manufacturer Availability:

• Rubycon substitutes are available in quantities of 757 to 1429 pieces.
• Nichicon LQS2G121MELZ30 is available in 616 pieces.

Selection between substitute parts depends on system voltage margin requirements and thermal lifetime expectations. All substitutes are mechanically and electrically compatible with the original part's through-hole snap-in mounting configuration.

Frequently Asked Questions (FAQ)

Q: Can the 400 V rated substitutes be used in place of the 350 V SLP121M350A3P3?

A: Yes. The 400 V and 450 V rated substitutes are qualified replacements. Higher voltage ratings provide additional safety margin in the circuit without affecting capacitance or tolerance specifications. The component will function identically in circuits designed for 350 V operation.

Q: What is the difference between the Rubycon HXG, MXG, and VXH series substitutes?

A: All three Rubycon series (HXG, MXG, VXH) maintain identical capacitance, tolerance, package dimensions, and lead spacing. The primary differences are voltage rating and thermal lifetime. The VXH series (450VXH120MEFCSN22X30) offers 5000 Hrs @ 105°C compared to 3000 Hrs for HXG and MXG series.

Q: Is the Nichicon LQS2G121MELZ30 mechanically compatible with the original part?

A: Yes. The LQS2G121MELZ30 maintains identical lead spacing (0.394" / 10.00 mm), can diameter (0.866" / 22.00 mm), and seated height (1.260" / 32.00 mm). It is a direct mechanical and electrical substitute with snap-in through-hole mounting.

Q: What is the significance of ESR (Equivalent Series Resistance) in the original part specification?

A: The SLP121M350A3P3 specifies 2.765 Ohm @ 120 Hz ESR. Substitute parts do not provide ESR values in the available data. ESR affects ripple current handling and thermal performance. If ESR is a critical design parameter, the original part should be retained or ESR specifications should be obtained from substitute manufacturers.

Q: Can these substitutes be used in high-frequency ripple current applications?

A: The substitutes support ripple current operation at both low frequency (120 Hz) and high frequency (10 kHz to 50 kHz). The original SLP121M350A3P3 specifies 750 mA @ 120 Hz and 1.1 A @ 20 kHz. Substitute ripple current ratings vary by series; verify that the selected substitute meets the specific ripple current requirements of your application.

Q: Are all substitute parts REACH compliant?

A: Yes. All substitute parts listed are REACH Unaffected, matching the compliance status of the original SLP121M350A3P3.

Q: What is the Moisture Sensitivity Level (MSL) of the substitutes?

A: The original SLP121M350A3P3 has MSL 1 (Unlimited). Rubycon substitutes also have MSL 1. The Nichicon LQS2G121MELZ30 is listed as Not Applicable for MSL, indicating it does not require moisture sensitivity classification.