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381LR271M400A022 Equivalent & Substitute Parts
Part Overview
The 381LR271M400A022 is a 270 µF, 400 V aluminum electrolytic capacitor in radial, can snap-in configuration manufactured by Cornell Dubilier Electronics (CDE). This component is classified as obsolete, though 866 pieces remain in stock as new original inventory. The part operates across a temperature range of -25°C to 105°C with a rated lifetime of 3000 hours at 105°C. Due to its obsolete status, equivalent and substitute parts from active product lines are necessary for ongoing design support, maintenance, and new production applications requiring compatible electrical and mechanical characteristics.
Substiute Parts
Key Parameters
| Parameter | Value | Unit |
|---|---|---|
| Capacitance | 270 | µF |
| Tolerance | ±20% | - |
| Voltage - Rated | 400 | V |
| ESR @ 120 Hz | 491 | mOhm |
| Lifetime @ 105°C | 3000 | Hrs |
| Operating Temperature Range | -25 to 105 | °C |
| Ripple Current @ 120 Hz | 1.56 | A |
| Ripple Current @ 20 kHz | 2.23 | A |
| Lead Spacing | 0.394 (10.00) | in (mm) |
| Diameter | 1.378 (35.00) | in (mm) |
| Height - Seated (Max) | 1.260 (32.00) | in (mm) |
| Mounting Type | Through Hole | - |
| Package / Case | Radial, Can - Snap-In | - |
| RoHS Status | ROHS3 Compliant | - |
| Polarization | Polar | - |
Substitute Part Grouping Explanation
Substitution of the 381LR271M400A022 is determined by the following critical parameters:
Primary Substitution Criteria:
- Capacitance: 270 µF (exact match required)
- Tolerance: ±20% (exact match required)
- Voltage Rating: 400 V minimum (equal or higher voltage acceptable)
- Mounting Type: Through Hole (exact match required)
- Package / Case: Radial, Can - Snap-In (exact match required)
- Lead Spacing: 0.394" (10.00 mm) (exact match required)
- Operating Temperature Range: -25°C to 105°C (exact match required)
- Polarization: Polar (exact match required)
Secondary Compatibility Parameters:
- ESR @ 120 Hz: 491 mOhm (lower ESR acceptable; higher ESR acceptable with application review)
- Lifetime @ 105°C: 3000 Hrs (equal or greater lifetime acceptable)
- Ripple Current Ratings: 1.56 A @ 120 Hz, 2.23 A @ 20 kHz (equal or greater current handling acceptable)
- Physical Dimensions (Diameter and Height): Must accommodate board layout constraints
Substitutes are grouped into three categories: Direct Manufacturer Equivalents (same voltage, active status), Upgrade Options (higher voltage rating), and Similar Alternatives (different physical dimensions or electrical characteristics within acceptable parameters).
Parameter Comparison
| Part Number | Manufacturer | Series | Capacitance (µF) | Voltage (V) | ESR @ 120 Hz (mOhm) | Lifetime @ 105°C (Hrs) | Diameter (mm) | Height (mm) | Status | Inventory |
|---|---|---|---|---|---|---|---|---|---|---|
| 381LR271M400A022 | CDE | 381LR | 270 | 400 | 491 | 3000 | 35.00 | 32.00 | Obsolete | 866 |
| 381LR271M400K032 | CDE | 381LR | 270 | 400 | 491 | 3000 | 30.00 | 37.00 | Active | 2523 |
| 381LR271M420A022 | CDE | 381LR | 270 | 420 | 491 | 3000 | 35.00 | 32.00 | Active | 937 |
| SLP271M420H3P3 | CDE | SLP0712TE (750W) | 270 | 420 | 1229 | 3000 | 35.00 | 32.00 | Active | 797 |
| 381LQ271M400A012 | CDE | 381LQ | 270 | 400 | 675 | 2000 | 35.00 | 27.00 | Active | 967 |
| 381LQ271M400J042 | CDE | 381LQ | 270 | 400 | 675 | 2000 | 25.00 | 42.00 | Active | 675 |
| 381LR271M400J452 | CDE | 381LR | 270 | 400 | 491 | 3000 | 25.00 | 47.00 | Active | 836 |
| 381LR271M450A032 | CDE | 381LR | 270 | 450 | 491 | 3000 | 35.00 | 37.00 | Active | 1642 |
| 381LX271M400J052 | CDE | 381LX | 270 | 400 | - | 3000 | 25.00 | 52.00 | Active | 1584 |
| 381LX271M400K032 | CDE | 381LX | 270 | 400 | - | 3000 | 30.00 | 37.00 | Active | 843 |
| 381LX271M400A022 | CDE | 381LX | 270 | 400 | - | 3000 | 35.00 | 32.00 | Active | 7748 |
Engineering Selection Recommendations
Direct Equivalent - Same Voltage (400 V):
The 381LX271M400A022 is the primary parametric equivalent. It maintains identical capacitance (270 µF), voltage rating (400 V), tolerance (±20%), operating temperature range (-25°C to 105°C), lifetime (3000 Hrs @ 105°C), lead spacing (10.00 mm), and physical dimensions (35.00 mm diameter × 32.00 mm height). This part is active with 7748 units in stock. Both parts are ROHS3 compliant and REACH unaffected. The 381LX271M400A022 is the recommended first choice for direct replacement in applications where the original 381LR271M400A022 is specified.
The 381LR271M400K032 provides an alternative equivalent with identical electrical specifications but different physical dimensions (30.00 mm diameter × 37.00 mm height). This part is suitable where board layout accommodates the modified footprint. It is active with 2523 units in stock.
Upgrade Options - Higher Voltage Rating (420 V or 450 V):
The 381LR271M420A022 offers a voltage upgrade to 420 V while maintaining the same physical dimensions (35.00 mm diameter × 32.00 mm height), lead spacing, and ESR characteristics (491 mOhm @ 120 Hz). This part is active with 937 units in stock and is suitable for applications where increased voltage margin is beneficial.
The 381LR271M450A032 provides a 450 V upgrade with identical ESR and lifetime specifications. Physical dimensions are 35.00 mm diameter × 37.00 mm height. This part is active with 1642 units in stock.
The SLP271M420H3P3 is a 420 V upgrade from the SLP series with identical physical dimensions to the main part (35.00 mm diameter × 32.00 mm height). However, this part exhibits higher ESR (1.229 Ohm @ 120 Hz) and lower ripple current ratings compared to the 381LR series. Selection of this part requires confirmation that the application tolerates increased ESR and reduced ripple current capacity.
Similar Alternatives - Different Physical Dimensions:
The 381LQ271M400A012 maintains 400 V rating and identical diameter (35.00 mm) but with reduced height (27.00 mm). This part has higher ESR (675 mOhm @ 120 Hz) and shorter lifetime (2000 Hrs @ 105°C). It is active with 967 units in stock.
The 381LQ271M400J042 provides a compact alternative with 25.00 mm diameter and 42.00 mm height. It shares the same ESR and lifetime limitations as the 381LQ series.
The 381LR271M400J452 maintains the 381LR series characteristics (491 mOhm ESR, 3000 Hrs lifetime) with a compact 25.00 mm diameter and extended 47.00 mm height. This part is active with 836 units in stock.
The 381LX271M400J052 and 381LX271M400K032 are 381LX series alternatives with different physical dimensions. ESR values are not specified for these parts. Both are active with 1584 and 843 units in stock respectively.
All substitute parts are ROHS3 compliant, REACH unaffected, and rated for -25°C to 105°C operation.
Frequently Asked Questions (FAQ)
Q: Can the 381LX271M400A022 be used as a direct replacement for the 381LR271M400A022?
A: Yes. Both parts share identical capacitance (270 µF), voltage rating (400 V), tolerance (±20%), operating temperature range (-25°C to 105°C), lifetime (3000 Hrs @ 105°C), lead spacing (10.00 mm), and physical dimensions (35.00 mm diameter × 32.00 mm height). The 381LX271M400A022 is active with significantly higher inventory (7748 units) compared to the obsolete 381LR271M400A022.
Q: What is the difference between the 381LR and 381LX series?
A: The 381LR and 381LX series share identical electrical specifications for the 270 µF 400 V configuration, including capacitance, voltage rating, tolerance, operating temperature range, and lifetime. ESR specifications are provided for the 381LR series (491 mOhm @ 120 Hz) but not specified for the 381LX series in the available data. Both series are ROHS3 compliant and suitable for general purpose applications.
Q: Can I use a 420 V or 450 V rated capacitor in place of the 400 V part?
A: Yes. Higher voltage-rated capacitors are electrically compatible with lower voltage applications. The 381LR271M420A022 (420 V) and 381LR271M450A032 (450 V) maintain identical capacitance, tolerance, ESR, and lifetime specifications. Selection of a higher voltage part provides increased voltage margin and is acceptable from an electrical standpoint. Verify that board layout accommodates any dimensional differences.
Q: What are the physical dimension constraints for substitution?
A: The main part 381LR271M400A022 has a diameter of 35.00 mm and seated height of 32.00 mm with 10.00 mm lead spacing. Substitutes with identical dimensions include 381LX271M400A022, 381LR271M420A022, and SLP271M420H3P3. Alternatives with different dimensions include 381LR271M400K032 (30.00 mm diameter × 37.00 mm height), 381LQ271M400A012 (35.00 mm diameter × 27.00 mm height), and 381LR271M400J452 (25.00 mm diameter × 47.00 mm height). Board layout must accommodate the selected substitute's footprint.
Q: How does ESR affect capacitor selection?
A: The main part 381LR271M400A022 has an ESR of 491 mOhm @ 120 Hz. Substitutes with identical or lower ESR include all 381LR and 381LX series parts at 491 mOhm or unspecified. The 381LQ series has higher ESR (675 mOhm @ 120 Hz), and the SLP271M420H3P3 has significantly higher ESR (1.229 Ohm @ 120 Hz). Lower ESR is generally preferred for ripple current handling and thermal performance. Higher ESR substitutes require confirmation that the application tolerates increased impedance.
Q: What is the difference between 2000 Hrs and 3000 Hrs lifetime ratings?
A: The main part 381LR271M400A022 is rated for 3000 hours at 105°C. The 381LQ series parts are rated for 2000 hours at 105°C. The 3000-hour rating provides longer operational life under thermal stress. Selection of a 2000-hour part is acceptable if the application does not require extended thermal endurance, but the 3000-hour rated parts are preferred for demanding environments.
Q: Are all substitute parts RoHS3 compliant?
A: Yes. All substitute parts listed are ROHS3 compliant and REACH unaffected, matching the compliance status of the main part 381LR271M400A022.
Q: What is the difference between packaging designations like A022, K032, and J452?
A: The packaging designations indicate different physical configurations and lead spacing variants. The A022 designation corresponds to the main part's configuration (35.00 mm diameter × 32.00 mm height). The K032 designation indicates 30.00 mm diameter × 37.00 mm height. The J452 designation indicates 25.00 mm diameter × 47.00 mm height. Selection depends on available board space and mounting requirements.
Q: Can I substitute a part with unspecified ESR?
A: The 381LX series parts (381LX271M400J052, 381LX271M400K032, 381LX271M400A022) do not have ESR values specified in the available data. These parts are electrically equivalent in capacitance, voltage, tolerance, and lifetime. If ESR is a critical parameter for the application, the 381LR series with specified 491 mOhm ESR is preferred. If ESR is not critical, the 381LX series parts are acceptable substitutes.
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