Equivalent & Substitute Parts for 380LX271M350K032

Part Overview

The Cornell Dubilier Electronics 380LX271M350K032 is a 270 µF, 350 V aluminum electrolytic capacitor in radial, can snap-in configuration. This component is classified as obsolete, necessitating identification of active equivalent and substitute parts for ongoing design support and procurement. The 380LX series has been superseded by newer product lines offering improved performance characteristics, extended temperature ratings, and reduced equivalent series resistance. Substitute parts maintain the core electrical specifications while offering enhanced reliability and availability through active product status.

Key Parameters

Parameter	Value	Unit
Capacitance	270	µF
Tolerance	±20%	—
Voltage - Rated	350	V
ESR @ 120 Hz	737	mOhm
Lifetime @ Temperature	3000 Hrs @ 85°C	—
Operating Temperature Range	-25°C to 85°C	—
Lead Spacing	10.00	mm
Diameter	30.00	mm
Height - Seated (Max)	37.00	mm
Mounting Type	Through Hole	—
Package / Case	Radial, Can - Snap-In	—
RoHS Status	ROHS3 Compliant	—
REACH Status	REACH Unaffected	—

Substitute Part Grouping Explanation

Substitution logic for the 380LX271M350K032 is based on the following critical parameters that must remain constant or improve:

Core Electrical Parameters (Must Match or Exceed):

Capacitance: 270 µF (±20% tolerance maintained)
Voltage Rating: 350 V minimum (higher voltage ratings are acceptable upgrades)
Polarization: Polar (electrolytic)
Ripple current capability at operating frequencies

Mechanical Parameters (Must Match):

Lead spacing: 10.00 mm (0.394")
Diameter: 30.00 mm (1.181")
Mounting type: Through Hole
Package configuration: Radial, Can - Snap-In

Thermal & Reliability Parameters:

Operating temperature range: -25°C to 85°C minimum
Lifetime rating: 3000 Hrs @ 85°C minimum
ESR performance: 737 mOhm @ 120 Hz or lower

Compliance Requirements:

RoHS3 Compliant
REACH Unaffected
ECCN: EAR99

Substitute parts are categorized as:

Direct Substitutes – Identical electrical and mechanical specifications with active product status
Upgrade Substitutes – Enhanced voltage ratings, improved ESR, extended temperature ratings, or superior ripple current handling
Similar Alternatives – Same core specifications but with dimensional or lifetime variations

Parameter Comparison

Part Number	Manufacturer	Series	Capacitance (µF)	Voltage (V)	ESR @ 120Hz (mOhm)	Lifetime @ Temp	Operating Temp (°C)	Height (mm)	Product Status
380LX271M350K032	CDE	380LX	270	350	737	3000 Hrs @ 85°C	-25 to 85	37.00	Obsolete
SLPX271M350E1P3	CDE	SLPX	270	350	737	3000 Hrs @ 85°C	-25 to 85	27.00	Active
380LX271M400K032	CDE	380LX	270	400	680	3000 Hrs @ 85°C	-25 to 85	37.00	Active
381LR271M400K032	CDE	381LR	270	400	491	3000 Hrs @ 105°C	-25 to 105	37.00	Active
381LX271M400K032	CDE	381LX	270	400	—	3000 Hrs @ 105°C	-25 to 105	37.00	Active
SLP271M400E5P3	CDE	SLP0712TE (750W)	270	400	1229	3000 Hrs @ 105°C	-25 to 105	37.00	Active
SLPX271M385E5P3	CDE	SLPX	270	385	737	3000 Hrs @ 85°C	-25 to 85	37.00	Active
SLPX271M420E5P3	CDE	SLPX	270	420	737	3000 Hrs @ 85°C	-25 to 85	37.00	Active
SLPX271M450E5P3	CDE	SLPX	270	450	983	3000 Hrs @ 85°C	-25 to 85	37.00	Active
380LQ271M350H042	CDE	380LQ	270	350	737	2000 Hrs @ 85°C	-25 to 85	42.00	Active
380LQ271M350J022	CDE	380LQ	270	350	737	2000 Hrs @ 85°C	-25 to 85	32.00	Active

Engineering Selection Recommendations

Direct Substitute (Preferred for Drop-In Replacement):

SLPX271M350E1P3 is the primary direct substitute. This part maintains identical electrical specifications (270 µF, 350 V, 737 mOhm ESR, 3000 Hrs @ 85°C) and mechanical compatibility (10.00 mm lead spacing, 30.00 mm diameter, through-hole snap-in mounting). The SLPX series is active product status with ROHS3 compliance and REACH unaffected certification. The reduced seated height (27.00 mm versus 37.00 mm) provides improved PCB layout flexibility while maintaining all electrical performance parameters.

Voltage Upgrade Substitutes (Enhanced Reliability):

For applications requiring improved voltage margin or extended operational headroom, the following active parts provide voltage upgrades while maintaining 270 µF capacitance and mechanical compatibility:

380LX271M400K032 (400 V, 680 mOhm ESR) – Same series family with improved ESR performance
381LR271M400K032 (400 V, 491 mOhm ESR, 105°C rated) – Superior ESR reduction and extended temperature capability to 105°C
381LX271M400K032 (400 V, 105°C rated) – Extended temperature rating with maintained mechanical footprint
SLPX271M385E5P3 (385 V) – Intermediate voltage option with active status
SLPX271M420E5P3 (420 V) – Higher voltage margin with active status
SLPX271M450E5P3 (450 V) – Maximum voltage option for demanding applications

All voltage upgrade options maintain the 10.00 mm lead spacing, 30.00 mm diameter, and through-hole snap-in configuration. Voltage upgrades are electrically backward compatible in circuits designed for 350 V operation.

Similar Alternatives (Dimensional Variations):

The 380LQ series (380LQ271M350H042 and 380LQ271M350J022) maintains 350 V rating and 270 µF capacitance with identical ESR and electrical performance. These parts feature reduced lifetime rating (2000 Hrs @ 85°C versus 3000 Hrs) and dimensional variations in height and diameter. Selection of these alternatives should be limited to applications where the reduced lifetime rating is acceptable and space constraints require specific dimensional profiles.

Compliance Verification:

All recommended substitute parts maintain ROHS3 compliance and REACH unaffected status, ensuring regulatory alignment with the original 380LX271M350K032 specification.

Frequently Asked Questions (FAQ)

Q1: Can SLPX271M350E1P3 be used as a direct replacement for 380LX271M350K032?

A: Yes. SLPX271M350E1P3 is electrically and mechanically compatible. Both parts specify 270 µF, 350 V, 737 mOhm ESR @ 120 Hz, and 3000 Hrs @ 85°C lifetime. Lead spacing (10.00 mm), diameter (30.00 mm), and mounting type (through-hole snap-in) are identical. The reduced seated height (27.00 mm) of SLPX271M350E1P3 provides improved PCB layout without compromising performance. SLPX271M350E1P3 carries active product status with ROHS3 compliance.

Q2: What is the advantage of upgrading to 400 V rated parts?

A: Voltage upgrade substitutes (380LX271M400K032, 381LR271M400K032, 381LX271M400K032) provide increased voltage margin in circuits operating near the 350 V limit. The 381LR271M400K032 additionally offers reduced ESR (491 mOhm versus 737 mOhm) and extended operating temperature to 105°C, improving thermal performance and ripple current handling. These upgrades maintain identical capacitance (270 µF) and mechanical compatibility while enhancing reliability margins.

Q3: Are higher voltage ratings (420 V, 450 V) suitable for 350 V applications?

A: Yes. SLPX271M420E5P3 and SLPX271M450E5P3 are electrically backward compatible in circuits designed for 350 V operation. Higher voltage ratings provide additional safety margin and are mechanically identical to the original part (10.00 mm lead spacing, 30.00 mm diameter, 37.00 mm height, through-hole snap-in). Selection of higher voltage options depends on circuit design requirements and cost considerations.

Q4: What is the difference between 380LQ and 380LX series parts?

A: The 380LQ series (380LQ271M350H042, 380LQ271M350J022) maintains the same electrical specifications as 380LX271M350K032 (270 µF, 350 V, 737 mOhm ESR) but specifies reduced lifetime rating (2000 Hrs @ 85°C versus 3000 Hrs). 380LQ parts feature dimensional variations: 380LQ271M350H042 has 22.00 mm diameter and 42.00 mm height; 380LQ271M350J022 has 25.00 mm diameter and 32.00 mm height. These alternatives are suitable only when reduced lifetime is acceptable and specific dimensional constraints exist.

Q5: How does ESR affect capacitor selection?

A: Equivalent Series Resistance (ESR) determines ripple current handling capability and heat dissipation. Lower ESR values indicate improved performance. The original 380LX271M350K032 specifies 737 mOhm ESR. Substitute parts with lower ESR (such as 381LR271M400K032 at 491 mOhm) provide superior ripple current capacity and reduced thermal stress. Parts with higher ESR (such as SLP271M400E5P3 at 1229 mOhm) are suitable only for applications with lower ripple current requirements.

Q6: What is the significance of operating temperature range extension to 105°C?

A: Parts rated to 105°C (381LR271M400K032, 381LX271M400K032) provide extended operational capability in high-temperature environments. These parts maintain 3000 Hrs lifetime at the elevated temperature rating, compared to 3000 Hrs @ 85°C for standard-rated parts. Selection of 105°C-rated components is necessary for applications with sustained elevated ambient temperatures or high internal heat generation.

Q7: Are all substitute parts ROHS3 compliant?

A: Yes. All recommended substitute parts carry ROHS3 compliance certification and REACH unaffected status, matching the regulatory requirements of the original 380LX271M350K032. Compliance verification is documented in product specifications.

Q8: Can SLPX271M350E1P3 be used in space-constrained PCB layouts?

A: Yes. SLPX271M350E1P3 features reduced seated height (27.00 mm) compared to the original part (37.00 mm), providing 10.00 mm height reduction while maintaining all electrical specifications and mechanical compatibility. This dimensional advantage makes SLPX271M350E1P3 suitable for compact PCB designs without performance compromise.

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