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381LX331M450K052 Equivalent & Substitute Parts
Part Overview
The 381LX331M450K052 is a 330 µF, 450 V aluminum electrolytic capacitor manufactured by Cornell Dubilier Electronics (CDE) in a radial, can snap-in package. This component is rated for 3000 hours at 105°C and is designed for general-purpose applications requiring high-voltage energy storage and filtering. The part is Active status and RoHS3 compliant. Equivalent and substitute parts are identified to support procurement flexibility, inventory management, and design continuity when the primary part becomes unavailable or when alternative performance characteristics are required.
Substiute Parts
Key Parameters
| Parameter | Value | Unit |
|---|---|---|
| Capacitance | 330 | µF |
| Tolerance | ±20% | - |
| Voltage - Rated | 450 | V |
| Lifetime @ Temperature | 3000 | Hrs @ 105°C |
| Operating Temperature Range | -25°C ~ 105°C | - |
| Polarization | Polar | - |
| Lead Spacing | 0.394" (10.00mm) | - |
| Mounting Type | Through Hole | - |
| Package / Case | Radial, Can - Snap-In | - |
| RoHS Status | ROHS3 Compliant | - |
| Moisture Sensitivity Level | 1 (Unlimited) | - |
Substitute Part Grouping Explanation
Substitution of the 381LX331M450K052 is determined by strict adherence to the following electrical and mechanical parameters:
Critical Parameters (Must Match):
- Capacitance: 330 µF
- Voltage Rating: 450 V
- Tolerance: ±20%
- Polarization: Polar
- Lead Spacing: 0.394" (10.00mm)
- Mounting Type: Through Hole
- Package Type: Radial, Can - Snap-In
- Operating Temperature Range: -25°C ~ 105°C
- RoHS3 Compliance
Flexible Parameters (May Vary):
- Lifetime @ 105°C: 3000 hours or greater
- Physical dimensions (diameter and height)
- ESR (Equivalent Series Resistance)
- Ripple current ratings
- Manufacturer identity
Substitute parts are grouped into three categories:
-
Similar Manufacturer Parts (CDE): Parts from the same manufacturer with identical electrical specifications but different physical dimensions or series designations.
-
Parametric Equivalents (CDE): Parts with matching electrical parameters and identical physical dimensions to the main part, differing only in series designation.
-
Direct Equivalents (Alternative Manufacturers): Parts from Rubycon, EPCOS - TDK Electronics, and Chemi-Con that meet all critical electrical and mechanical parameters.
Parameter Comparison
| Part Number | Manufacturer | Series | Capacitance (µF) | Voltage (V) | Tolerance | Lifetime @ 105°C (Hrs) | Diameter (mm) | Height (mm) | Lead Spacing (mm) | ESR |
|---|---|---|---|---|---|---|---|---|---|---|
| 381LX331M450K052 | CDE | 381LX | 330 | 450 | ±20% | 3000 | 30.00 | 52.00 | 10.00 | - |
| 381LQ331M450A032 | CDE | 381LQ | 330 | 450 | ±20% | 2000 | 35.00 | 37.00 | 10.00 | 553mOhm @ 120Hz |
| 381LR331M450A042 | CDE | 381LR | 330 | 450 | ±20% | 3000 | 35.00 | 42.00 | 10.00 | 402mOhm @ 120Hz |
| 381LX331M450A042 | CDE | 381LX | 330 | 450 | ±20% | 3000 | 35.00 | 42.00 | 10.00 | - |
| SLP331M450H5P3 | CDE | SLP0712TE (750W) | 330 | 450 | ±20% | 3000 | 35.00 | 35.00 | 10.00 | 1.005Ohm |
| 381LR331M450K052 | CDE | 381LR | 330 | 450 | ±20% | 3000 | 30.00 | 52.00 | 10.00 | 402mOhm @ 120Hz |
| 450MXG330MEFCSN30X40 | Rubycon | MXG | 330 | 450 | ±20% | 3000 | 30.00 | 42.00 | 10.00 | - |
| 450MXK330MEFCFA30X30 | Rubycon | MXK | 330 | 450 | ±20% | 3000 | 30.00 | 32.00 | 10.00 | - |
| 450VXH330MEFCSN30X40 | Rubycon | VXH | 330 | 450 | ±20% | 5000 | 30.00 | 42.00 | 10.00 | - |
| B43509A5337M000 | EPCOS - TDK Electronics | B43509 | 330 | 450 | ±20% | 3000 | 30.00 | 52.00 | 10.00 | 300mOhm @ 100Hz |
| ELXS451VSN331MR40S | Chemi-Con | LXS | 330 | 450 | ±20% | 5000 | 30.00 | 42.00 | 10.00 | - |
Engineering Selection Recommendations
Direct Parametric Equivalent (Identical Dimensions):
The 381LR331M450K052 is a direct parametric equivalent with identical physical dimensions (30.00mm diameter, 52.00mm height) and matching electrical specifications. This part maintains the same lead spacing and mounting footprint, requiring no PCB layout modifications. Both parts are CDE manufactured, Active status, and RoHS3 compliant. The 381LR series provides lower ESR (402mOhm @ 120Hz) compared to the 381LX series, which may improve ripple current handling in high-frequency applications.
Alternative Manufacturers with Matching Dimensions:
The 450MXG330MEFCSN30X40 (Rubycon MXG series) and B43509A5337M000 (EPCOS - TDK Electronics B43509 series) both maintain the 30.00mm diameter and are available in 42.00mm and 52.00mm heights respectively. Both are Active status and RoHS3 compliant. The B43509A5337M000 matches the exact 52.00mm height of the main part and provides documented ESR of 300mOhm @ 100Hz.
Extended Lifetime Option:
The 450VXH330MEFCSN30X40 (Rubycon VXH series) and ELXS451VSN331MR40S (Chemi-Con LXS series) both provide 5000-hour lifetime at 105°C, exceeding the 3000-hour specification of the main part. Both maintain 30.00mm diameter and 42.00mm height, are Active status, and RoHS3 compliant. These parts are suitable for applications requiring extended operational life.
Compact Form Factor:
The 450MXK330MEFCFA30X30 (Rubycon MXK series) provides the most compact dimensions at 30.00mm diameter and 32.00mm height while maintaining all critical electrical parameters. This part is suitable for space-constrained applications and is Active status with RoHS3 compliance.
All substitute parts listed maintain the critical parameters of 330 µF capacitance, 450 V rating, ±20% tolerance, polar configuration, 10.00mm lead spacing, through-hole mounting, and radial snap-in package type. All are RoHS3 compliant and suitable for general-purpose applications within the -25°C to 105°C operating temperature range.
Frequently Asked Questions (FAQ)
Q: Can I substitute the 381LX331M450K052 with a part having different physical dimensions?
A: Physical dimensions may vary provided the lead spacing remains 0.394" (10.00mm) and the package type remains radial snap-in. However, dimensional changes require verification of PCB layout compatibility. The diameter and height must fit within the available board space and clearance envelope.
Q: What is the significance of ESR (Equivalent Series Resistance) in selecting a substitute?
A: ESR affects ripple current handling and heat dissipation. Lower ESR values indicate better high-frequency performance. The main part 381LX331M450K052 does not specify ESR, while alternatives such as the 381LR series (402mOhm @ 120Hz) and B43509A5337M000 (300mOhm @ 100Hz) provide documented values. Selection depends on ripple current requirements in the application.
Q: Are all substitute parts RoHS3 compliant?
A: Yes. All substitute parts listed in this reference are RoHS3 compliant and REACH unaffected, matching the compliance status of the main part 381LX331M450K052.
Q: What is the difference between the 381LX and 381LR series from CDE?
A: Both series are manufactured by Cornell Dubilier Electronics and share identical electrical specifications (330 µF, 450 V, ±20%, 3000 Hrs @ 105°C). The 381LR series provides documented ESR of 402mOhm @ 120Hz and higher ripple current ratings (1.85 A @ 120 Hz and 2.64 A @ 20 kHz) compared to the 381LX series (1.4 A @ 120 Hz and 1.9 A @ 20 kHz).
Q: Can I use a substitute with a longer lifetime rating (5000 hours instead of 3000 hours)?
A: Yes. Parts with extended lifetime ratings such as the 450VXH330MEFCSN30X40 (5000 Hrs @ 105°C) and ELXS451VSN331MR40S (5000 Hrs @ 105°C) are direct substitutes. Extended lifetime provides additional operational margin and is not detrimental to circuit performance.
Q: What is the difference between snap-in and other mounting types?
A: Snap-in packages feature mechanical locking tabs that secure the capacitor to the PCB without solder, allowing for quick insertion and removal. All substitute parts maintain the snap-in configuration, ensuring compatibility with existing PCB designs and assembly processes.
Q: Are there inventory considerations when selecting a substitute?
A: Yes. Inventory levels vary significantly among substitute parts. The 450MXK330MEFCFA30X30 has the highest inventory (273,882 pcs), while other parts such as 381LQ331M450A032 (2,069 pcs) and B43509A5337M000 (1,093 pcs) have lower availability. Procurement timelines and lead times should be evaluated based on current inventory status.
Q: What is the operating temperature range for all substitute parts?
A: All substitute parts operate within the -25°C to 105°C range, matching the main part specification. The B43509A5337M000 extends the lower temperature limit to -40°C, providing enhanced cold-temperature performance if required by the application.
Q: Can I mix different substitute parts in the same circuit?
A: Yes, provided all parts meet the critical electrical parameters (330 µF, 450 V, ±20%, polar, 10.00mm lead spacing, through-hole snap-in package). However, mixing parts with different ESR values or ripple current ratings may affect circuit performance characteristics. Consistency within a single design is recommended.
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