LPX151M400C3P3 Equivalent & Substitute Parts

Part Overview

The LPX151M400C3P3 is a 150 µF, 400 V aluminum electrolytic capacitor in radial, can snap-in configuration manufactured by Cornell Dubilier Electronics (CDE) from the LPX series. This component is classified as Active status and serves general-purpose applications requiring reliable energy storage and filtering in moderate-voltage AC or DC circuits.

Identifying equivalent and substitute parts is necessary when the primary component becomes unavailable, when design specifications allow for higher performance ratings, or when alternative manufacturers' components offer superior reliability metrics such as extended lifetime or improved thermal performance. Substitute parts must maintain the same capacitance value, tolerance, mounting type, and package configuration while operating within compatible voltage and temperature ranges.

Substiute Parts

LPX151M400C3P3

Cornell Dubilier Electronics (CDE)In Stock: 1199LPX151M400C3P3 Datasheet

Current PartRFQ

B43508B5157M000

EPCOS - TDK ElectronicsIn Stock: 1158B43508B5157M000 Datasheet

DirectRFQ

B43501B9157M000

EPCOS - TDK ElectronicsIn Stock: 2282B43501B9157M000 Datasheet

SimilarRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution eligibility for aluminum electrolytic capacitors is determined by strict adherence to the following critical electrical and mechanical parameters:

Mandatory Matching Parameters:

• Capacitance value: 150 µF (no variance permitted)
• Tolerance: ±20% (must match or be tighter)
• Voltage rating: 400 V minimum (equal or higher acceptable)
• Polarization: Polar (identical)
• Package configuration: Radial, Can - Snap-In (identical)
• Mounting type: Through Hole (identical)
• Lead spacing: 0.394" (10.00 mm) (identical for PCB compatibility)

Compatible Parameter Ranges:

• Operating temperature range: Substitute must accommodate the circuit's operating conditions within the -40°C to 85°C envelope or extend it
• ESR (Equivalent Series Resistance): Lower values acceptable; directly improves circuit performance
• Lifetime specifications: Higher values acceptable; improves reliability
• Ripple current capacity: Equal or higher acceptable; ensures thermal stability

The two substitute parts identified meet these criteria with variations in voltage rating, thermal lifetime, and physical height that remain compatible with the original design requirements.

Parameter Comparison

Engineering Selection Recommendations

B43508B5157M000 (Direct Substitute - Preferred for New Designs): This EPCOS - TDK Electronics component is Active status and qualifies as the primary direct substitute. It maintains 150 µF capacitance and ±20% tolerance with a higher 450 V voltage rating, providing design margin above the 400 V requirement. The improved ESR specification (820 mΩ @ 100 Hz versus 1.326 Ω @ 120 Hz) delivers lower impedance and reduced power dissipation. Extended thermal lifetime (3000 Hrs @ 105°C) and expanded operating temperature range (-40°C ~ 105°C) enhance reliability. The slight physical height increase (1.260" versus 1.181") requires verification of available PCB clearance but maintains identical lead spacing and diameter compatibility.

B43501B9157M000 (Similar Substitute - Limited Applicability): This EPCOS - TDK Electronics component has Not For New Designs status, making it suitable only for legacy design updates, repair, or obsolescence mitigation of existing equipment. While it maintains 150 µF capacitance, 400 V voltage rating, and operating temperature compatibility, the superior ESR specification (440 mΩ @ 100 Hz) and significantly extended lifetime (10000 Hrs @ 85°C) reflect advanced manufacturing. Physical dimensions differ markedly: 1.181" diameter (versus 0.984" for the main part) with reduced height (0.984" versus 1.181"), requiring verification against PCB layout constraints.

For new circuit designs, B43508B5157M000 is recommended due to Active product status and superior electrical performance metrics.

Frequently Asked Questions (FAQ)

Q: Can B43508B5157M000 replace LPX151M400C3P3 directly in my circuit?

A: Yes, B43508B5157M000 is mechanically and electrically compatible as a direct substitute. The identical capacitance (150 µF), tolerance (±20%), and lead spacing (10.00 mm) ensure PCB compatibility. The higher voltage rating (450 V vs. 400 V) provides additional design margin. The only consideration is the increased height (1.260" vs. 1.181"), which requires verification that additional vertical clearance exists on your PCB assembly.

Q: Why does B43501B9157M000 have "Not For New Designs" status?

A: This designation indicates the component is in legacy production phase. While it remains available and functional, the manufacturer recommends B43508B5157M000 for new applications due to superior performance characteristics and extended product lifecycle support. B43501B9157M000 is appropriate for maintaining existing equipment or completing spare parts inventory for fielded systems.

Q: What is the significance of the different ESR values across these capacitors?

A: Equivalent Series Resistance (ESR) directly affects impedance and power dissipation in the capacitor. Lower ESR values (440 mΩ and 820 mΩ) dissipate less heat and provide lower impedance response compared to the primary part (1.326 Ω). In high-ripple-current or high-frequency applications, lower ESR substitutes deliver improved thermal stability and circuit performance. Note that ESR measurements are specified at different frequencies, which affects direct comparison but does not invalidate substitution.

Q: Can I use B43508B5157M000 in an application rated for 400 V operation?

A: Yes. The 450 V rated component operates safely at 400 V with design margin. The voltage rating specifies the maximum operating voltage; operation below this limit presents no reliability concern. This higher rating actually improves long-term capacitor lifespan by reducing electrical stress.

Q: Are there PCB layout constraints I should consider when substituting these parts?

A: Yes. All three parts maintain identical lead spacing (10.00 mm) and through-hole mounting configuration. However, physical diameters and heights differ: B43508B5157M000 is slightly taller (1.260" vs. 1.181"), while B43501B9157M000 has different diameter and height dimensions. Verify available vertical and horizontal clearance on your PCB assembly before implementing the substitution. If physical constraints are exceeded, the primary LPX151M400C3P3 part remains the only compatible option.

Q: Which substitute should I choose for a long-lifespan application?

A: B43501B9157M000 offers exceptional thermal lifetime (10000 Hrs @ 85°C) compared to B43508B5157M000 (3000 Hrs @ 105°C) and the primary part (1000 Hrs @ 85°C). However, due to Not For New Designs status, it is unsuitable for new product development. For new designs requiring extended lifespan, B43508B5157M000 provides the best balance of active product status, improved ESR, and reasonable lifetime specification (3000 Hrs @ 105°C).