LP122M250H9P3 Aluminum Electrolytic Capacitor - Equivalent & Substitute Parts

Part Overview

The LP122M250H9P3 is a 1200 µF, 250 V aluminum electrolytic capacitor manufactured by Cornell Dubilier Electronics (CDE) in the LP series. This radial, can-type snap-in capacitor is designed for general-purpose applications requiring high-capacity energy storage in compact through-hole mounting configurations. The product is Active status and ROHS3 compliant, making it suitable for modern electronic applications. Finding alternative components becomes necessary when original stock is unavailable, when superior lifetime ratings are required for extended operational periods, or when optimized electrical performance characteristics are required for specific application demands.

Substiute Parts

LP122M250H9P3

Cornell Dubilier Electronics (CDE)In Stock: 1062LP122M250H9P3 Datasheet

Current PartRFQ

381LQ122M250K452

Cornell Dubilier Electronics (CDE)In Stock: 1165381LQ122M250K452 Datasheet

SimilarRFQ

381LX122M250A452

Cornell Dubilier Electronics (CDE)In Stock: 1762381LX122M250A452 Datasheet

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Key Parameters

Substitute Part Grouping Explanation

Substitution validity for the LP122M250H9P3 is determined by the following critical electrical and mechanical parameters:

Electrical Equivalence Requirements:

• Capacitance: 1200 µF (core functional requirement)
• Voltage Rating: 250 V (minimum safe operating voltage)
• Tolerance: ±20% (acceptable accuracy specification)

Mechanical Compatibility Requirements:

• Package Type: Radial, Can - Snap-In (physical mounting compatibility)
• Lead Spacing: 10.00 mm (PCB footprint match)
• Mounting Type: Through Hole (installation method)
• Operating Temperature: -40°C to 105°C minimum (thermal envelope)
• Polarization: Polar (polarity-sensitive application)

Performance Parameters (Secondary Considerations):

• ESR characteristics (affects ripple current handling)
• Lifetime @ 105°C (determines operational reliability duration)
• Ripple current ratings (defines maximum AC component specification)

The substitute parts 381LQ122M250K452 and 381LX122M250A452 meet all primary electrical and mechanical equivalence criteria. Secondary performance parameters differ, providing options for applications with varying reliability and ripple current requirements.

Parameter Comparison

Engineering Selection Recommendations

All three components—LP122M250H9P3, 381LQ122M250K452, and 381LX122M250A452—are manufactured by Cornell Dubilier Electronics, maintain Active product status, and carry ROHS3 compliance with MSL-1 moisture sensitivity classification. This ensures regulatory compliance and long-term availability for modern electronic systems.

LP122M250H9P3 Selection: Use this component when baseline specifications are acceptable for the application and standard lifetime reliability is sufficient. This part offers established performance metrics with 1000-hour operational life at 105°C.

381LQ122M250K452 Selection: This substitute provides improved electrical performance with reduced ESR (138 mOhm versus 165 mOhm), resulting in lower heat generation and improved voltage regulation. The doubled operational lifetime (2000 hours at 105°C) enhances long-term reliability. However, the smaller case diameter (30.00 mm versus 35.00 mm) and reduced ripple current ratings require physical space verification on the target PCB.

381LX122M250A452 Selection: This substitute offers the highest operational lifetime (3000 hours at 105°C) for applications requiring extended field service periods. The case diameter matches the original part (35.00 mm), providing optimal physical compatibility while maintaining electrical equivalence. This option is appropriate when maximum service life and thermal cycling resistance are critical design parameters.

Frequently Asked Questions (FAQ)

Q: Can these substitute parts be directly interchanged with the LP122M250H9P3? A: Direct electrical interchange is possible for 381LQ122M250K452 and 381LX122M250A452 due to identical capacitance, voltage rating, tolerance, and operating temperature specifications. However, physical verification is required: 381LQ122M250K452 has a smaller case diameter (30.00 mm) and reduced height (47.00 mm) compared to the original 35.00 mm diameter and 50.00 mm height, which may affect PCB clearance and mounting hole alignment.

Q: What is the significance of ESR differences between these parts? A: ESR (Equivalent Series Resistance) directly affects ripple current capability and heat dissipation. The 381LQ122M250K452 exhibits lower ESR (138 mOhm) than the original LP122M250H9P3 (165 mOhm), resulting in improved thermal performance and higher ripple current handling. Lower ESR reduces voltage ripple and improves voltage regulation in the circuit.

Q: How do lifetime ratings impact component selection? A: Lifetime specifications (1000, 2000, and 3000 hours at 105°C) establish the expected operational duration under thermal stress conditions. Higher ratings correlate with longer field life. Selection depends on application service duration: choose 1000-hour rating for standard applications, 2000-hour rating for extended-life requirements, or 3000-hour rating for critical systems requiring maximum reliability margin.

Q: Why do ripple current ratings differ between these components? A: Ripple current capacity is determined by internal construction and materials. The LP122M250H9P3 rates 3.1 A at 120 Hz and 4.34 A at 100 kHz, while both substitutes rate 2.3 A at 120 Hz and approximately 3.2 A at 20 kHz. These differences reflect the different internal designs of each series and must be verified against actual circuit AC current specifications to ensure adequate margin.

Q: Are there any compliance or certification differences? A: All three parts carry identical compliance certifications: ROHS3 compliance, MSL-1 (unlimited) moisture sensitivity level, REACH Unaffected status, and ECCN/HTSUS classifications. No regulatory disadvantage exists when selecting any of these substitutes.

Q: Which substitute should be selected for PCB space-constrained applications? A: The 381LQ122M250K452 presents a smaller physical footprint with 30.00 mm case diameter and 47.00 mm seated height, reducing the spatial envelope required on the PCB. However, ripple current ratings are correspondingly reduced. The 381LX122M250A452 maintains the original case diameter (35.00 mm) with the same mounted height as 381LQ122M250K452 (47.00 mm), providing a balanced compromise between original physical compatibility and improved lifetime performance.