SLP151M400A7P3 Equivalent & Substitute Parts Reference

Part Overview

The SLP151M400A7P3 is a 150 µF, 400 V aluminum electrolytic capacitor manufactured by Cornell Dubilier Electronics (CDE) in a radial, can snap-in package. This component is classified as Active product status and is designed for general-purpose applications requiring high-voltage energy storage and filtering. The part operates across a temperature range of -25°C to 105°C with a rated lifetime of 3000 hours at 105°C.

Substitute parts become necessary when the original SLP151M400A7P3 reaches end-of-life inventory status, when supply chain constraints occur, or when design requirements call for enhanced performance characteristics such as extended operational lifetime or improved thermal stability. Alternative manufacturers offer equivalent capacitance and voltage ratings with compatible mechanical dimensions and electrical specifications.

Key Parameters

Parameter	Value	Unit	Substitution Relevance
Capacitance	150	µF	Critical - must match exactly
Voltage - Rated	400	V	Critical - minimum acceptable rating
Tolerance	±20%	%	Critical - must match or be tighter
Package / Case	Radial, Can - Snap-In	-	Critical - mechanical compatibility
Lead Spacing	0.394" (10.00 mm)	in (mm)	Critical - PCB footprint compatibility
Size / Dimension	0.866" Dia (22.00 mm)	in (mm)	Critical - physical fit
Height - Seated (Max)	1.654" (42.00 mm)	in (mm)	Critical - clearance verification
Mounting Type	Through Hole	-	Critical - assembly method
Lifetime @ Temp.	3000	Hrs @ 105°C	Important - reliability consideration
Operating Temperature	-25°C ~ 105°C	°C	Important - thermal envelope
RoHS Status	ROHS3 Compliant	-	Important - regulatory compliance
Polarization	Polar	-	Critical - installation orientation

Substitute Part Grouping Explanation

Substitution logic for the SLP151M400A7P3 is based on strict electrical and mechanical parameter matching within the aluminum electrolytic capacitor category. All substitute parts must satisfy the following mandatory criteria:

Critical Matching Parameters:

Capacitance: 150 µF (exact match required)
Tolerance: ±20% or tighter
Package Type: Radial, Can - Snap-In (identical mechanical interface)
Lead Spacing: 0.394" (10.00 mm)
Diameter: 0.866" (22.00 mm)
Height: 1.654" (42.00 mm) maximum
Mounting: Through Hole
Polarization: Polar

Voltage Rating Consideration: The SLP151M400A7P3 operates at 400 V rated voltage. Substitute parts are grouped into two categories:

Direct Equivalents (400 V Rating): B43504A9157M000 maintains the exact 400 V specification. This part is marked "Not For New Designs" but remains electrically and mechanically compatible.
Upgraded Alternatives (450 V Rating): Five substitute parts operate at 450 V rated voltage: 450VXG150MEFCSN22X40, B43508A5157M000, ELXS451VSN151MP40S, LGN2W151MELZ40, and LGX2W151MELZ40. These parts provide voltage margin above the original specification while maintaining identical capacitance, tolerance, and mechanical dimensions. All upgraded alternatives are classified as Active product status.

Compliance Requirements: All substitute parts maintain ROHS3 compliance and REACH unaffected status, ensuring regulatory alignment with the original component.

Parameter Comparison

Manufacturer Part Number	Manufacturer	Capacitance (µF)	Voltage (V)	Tolerance (%)	ESR @ Frequency	Lifetime @ 105°C (Hrs)	Operating Temp (°C)	Lead Spacing (mm)	Diameter (mm)	Height (mm)	Product Status
SLP151M400A7P3	Cornell Dubilier Electronics	150	400	±20	2.212 Ω @ 120 Hz	3000	-25 ~ 105	10.00	22.00	42.00	Active
B43504A9157M000	EPCOS - TDK Electronics	150	400	±20	590 mΩ @ 100 Hz	3000	-40 ~ 105	10.00	22.00	42.00	Not For New Designs
450VXG150MEFCSN22X40	Rubycon	150	450	±20	Not Specified	5000	-25 ~ 105	10.00	22.00	42.00	Active
B43508A5157M000	EPCOS - TDK Electronics	150	450	±20	820 mΩ @ 100 Hz	3000	-40 ~ 105	10.00	22.00	42.00	Active
ELXS451VSN151MP40S	Chemi-Con	150	450	±20	Not Specified	5000	-25 ~ 105	10.00	22.00	42.50	Active
LGN2W151MELZ40	Nichicon	150	450	±20	Not Specified	3000	-25 ~ 105	10.00	22.00	42.00	Active
LGX2W151MELZ40	Nichicon	150	450	±20	Not Specified	5000	-25 ~ 105	10.00	22.00	42.00	Active
LQS2W151MELZ40	Nichicon	150	450	±20	Not Specified	3000	-25 ~ 105	10.00	22.00	42.00	Active

Engineering Selection Recommendations

For Direct Replacement (400 V Specification):

B43504A9157M000 from EPCOS - TDK Electronics is the only direct electrical equivalent maintaining the 400 V rated voltage. This part carries "Not For New Designs" status, indicating it is available for legacy system support and repair applications only. The part demonstrates superior ESR performance (590 mΩ @ 100 Hz versus 2.212 Ω @ 120 Hz) and extended operating temperature range (-40°C to 105°C). ROHS3 compliance and REACH unaffected status align with regulatory requirements. Use this substitute when the original SLP151M400A7P3 is unavailable and the 400 V specification is mandatory for circuit operation.

For Upgraded Performance (450 V Specification):

Five Active-status alternatives operate at 450 V rated voltage, providing voltage margin above the original 400 V specification. Selection among these five parts depends on application-specific requirements:

LGX2W151MELZ40 (Nichicon LGX series): Offers 5000-hour lifetime at 105°C with 880 mA ripple current at 120 Hz. Recommended for applications requiring extended operational life and high ripple current handling.
450VXG150MEFCSN22X40 (Rubycon VXG series): Provides 5000-hour lifetime with 1.14 A ripple current at 120 Hz. Suitable for high-ripple-current applications with extended service requirements.
ELXS451VSN151MP40S (Chemi-Con LXS series): Delivers 5000-hour lifetime with 1.3442 A ripple current at 50 kHz. Recommended for high-frequency ripple environments. Note: Height is 42.50 mm (0.5 mm taller than original).
B43508A5157M000 (EPCOS - TDK Electronics B43508 series): Maintains 3000-hour lifetime with extended temperature range (-40°C to 105°C). Suitable for applications requiring lower operating temperature capability.
LGN2W151MELZ40 and LQS2W151MELZ40 (Nichicon LGN and LQS series): Both offer 3000-hour lifetime at 105°C with 790 mA ripple current at 120 Hz. Recommended for standard applications where 3000-hour lifetime is acceptable.

All upgraded alternatives maintain identical capacitance, tolerance, lead spacing, and diameter specifications. ROHS3 compliance and REACH unaffected status are preserved across all substitutes.

Frequently Asked Questions (FAQ)

Q: Can B43504A9157M000 be used as a direct replacement for SLP151M400A7P3?

A: Yes. B43504A9157M000 maintains identical electrical specifications (150 µF, ±20% tolerance, 400 V rating) and mechanical dimensions (10.00 mm lead spacing, 22.00 mm diameter, 42.00 mm height). Both parts are radial, can snap-in through-hole components. The substitute offers improved ESR performance and extended operating temperature range. However, B43504A9157M000 carries "Not For New Designs" status, limiting its use to legacy system support and repair applications.

Q: Why do the upgraded alternatives operate at 450 V instead of 400 V?

A: The 450 V rating provides voltage margin above the original 400 V specification. This higher rating does not affect circuit operation when the design calls for 400 V capacitors; the component simply operates below its maximum rated voltage, which is standard engineering practice. The 450 V alternatives are all Active-status products with current manufacturing support, making them preferable for new designs and long-term supply chain stability.

Q: Are all substitute parts mechanically compatible with the original SLP151M400A7P3?

A: All substitute parts maintain the critical mechanical parameters: 10.00 mm lead spacing, 22.00 mm diameter, and radial snap-in package type. One exception exists: ELXS451VSN151MP40S has a maximum seated height of 42.50 mm compared to 42.00 mm for the original part. This 0.5 mm difference must be evaluated against available PCB clearance in the target application. All other substitutes maintain the exact 42.00 mm height specification.

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. The 3000-hour rating (SLP151M400A7P3, B43504A9157M000, LGN2W151MELZ40, LQS2W151MELZ40) represents standard performance. The 5000-hour rating (450VXG150MEFCSN22X40, ELXS451VSN151MP40S, LGX2W151MELZ40) indicates extended operational life. Selection depends on application duty cycle and required service interval.

Q: Do all substitute parts maintain ROHS3 compliance?

A: Yes. All substitute parts listed carry ROHS3 Compliant status and REACH Unaffected designation, matching the regulatory compliance profile of the original SLP151M400A7P3. This ensures compatibility with environmental and hazardous substance regulations across all markets.

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

A: ESR affects ripple current handling capability and heat generation within the capacitor. Lower ESR values indicate better high-frequency performance and reduced thermal stress. The original SLP151M400A7P3 specifies 2.212 Ω @ 120 Hz. B43504A9157M000 offers superior ESR at 590 mΩ @ 100 Hz. Upgraded alternatives do not specify ESR values but provide ripple current ratings at specific frequencies. When ESR is not specified, ripple current ratings at the application's operating frequency should be used for performance comparison.

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

A: All substitute parts are electrically and mechanically equivalent for the specified parameters (150 µF, ±20%, 400 V minimum rating, radial snap-in package). Mixing different manufacturers or series in the same circuit is permissible from a functional standpoint. However, engineering practice typically standardizes on a single part number per assembly to simplify procurement, inventory management, and field service procedures.

Q: What is the operating temperature range consideration for substitute selection?

A: The original SLP151M400A7P3 operates from -25°C to 105°C. B43504A9157M000 extends the lower limit to -40°C, providing enhanced cold-temperature capability. All 450 V upgraded alternatives maintain the -25°C to 105°C range. Selection depends on the application's minimum operating temperature requirement. For applications requiring operation below -25°C, B43504A9157M000 is the only substitute option.

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