381LQ271M350K012 Equivalent & Substitute Parts

Part Overview

The 381LQ271M350K012 is a 270 µF, 350 V aluminum electrolytic capacitor manufactured by Cornell Dubilier Electronics (CDE) in a radial, can snap-in package. This component is classified as obsolete, though 651 pieces remain in stock. The part is rated for 2000 hours at 105°C with an equivalent series resistance (ESR) of 614 mOhm at 120 Hz, suitable for general-purpose applications requiring through-hole mounting.

Due to the obsolete status of the 381LQ271M350K012, equivalent and substitute parts are necessary for ongoing design support, production continuity, and long-term component availability. Active alternatives with identical or superior electrical and mechanical characteristics are available from multiple manufacturers.

Key Parameters

Parameter	Value	Unit
Capacitance	270	µF
Voltage Rating	350	V
Tolerance	±20%	—
ESR @ 120 Hz	614	mOhm
Lifetime @ 105°C	2000	Hours
Operating Temperature Range	-25 to 105	°C
Ripple Current @ 120 Hz	1.1	A
Lead Spacing	10.00	mm
Diameter	30.00	mm
Height (Seated Max)	27.00	mm
Package Type	Radial, Can - Snap-In	—
Mounting Type	Through Hole	—
RoHS Status	ROHS3 Compliant	—
Polarization	Polar	—

Substitute Part Grouping Explanation

Substitution of the 381LQ271M350K012 is determined by strict adherence to the following electrical and mechanical parameters:

Primary Substitution Criteria:

Capacitance: 270 µF (exact match required)
Voltage Rating: 350 V minimum (equal or higher acceptable)
Tolerance: ±20% (exact match required)
Polarization: Polar (exact match required)
Package Type: Radial, Can - Snap-In (exact match required)
Mounting Type: Through Hole (exact match required)
Lead Spacing: 10.00 mm (exact match required)

Secondary Compatibility Parameters:

Operating Temperature Range: -25°C to 105°C minimum (equal or wider acceptable)
Diameter: 30.00 mm (exact match preferred for mechanical fit)
Height: 27.00 mm (exact match preferred for mechanical fit)
RoHS Compliance: ROHS3 Compliant (required for regulatory alignment)

Substitutes are categorized as Direct, Similar, or Upgrade based on product status and lifetime ratings. Direct substitutes maintain identical specifications. Similar substitutes offer extended lifetime or improved performance characteristics. Upgrade substitutes provide higher voltage ratings or extended operational life while maintaining mechanical and electrical compatibility.

Parameter Comparison

Part Number	Manufacturer	Capacitance (µF)	Voltage (V)	Tolerance	ESR @ 120 Hz (mOhm)	Lifetime @ 105°C (Hrs)	Diameter (mm)	Height (mm)	Product Status	RoHS
381LQ271M350K012	Cornell Dubilier	270	350	±20%	614	2000	30.00	27.00	Obsolete	ROHS3
381LQ271M350J032	Cornell Dubilier	270	350	±20%	740	2000	25.00	37.00	Active	ROHS3
381LX271M350A012	Cornell Dubilier	270	350	±20%	—	3000	35.00	27.00	Active	ROHS3
381LX271M350K022	Cornell Dubilier	270	350	±20%	—	3000	30.00	32.00	Active	ROHS3
350VXH270MEFC30X25	Rubycon	270	350	±20%	—	5000	30.00	27.00	Active	ROHS3
400MXH270MEFC30X25	Rubycon	270	400	±20%	—	2000	30.00	27.00	Active	ROHS3
400MXH270MEFCSN30X25	Rubycon	270	400	±20%	—	2000	30.00	27.00	Active	ROHS3
400MXK270MEFC30X25	Rubycon	270	400	±20%	—	3000	30.00	27.00	Active	ROHS3
420MXK270MEFC30X25	Rubycon	270	420	±20%	—	3000	30.00	27.00	Active	ROHS3
EKMR401VSN271MR25S	Chemi-Con	270	400	±20%	—	2000	30.00	27.50	Active	ROHS3
EKMS401VSN271MR25S	Chemi-Con	270	400	±20%	—	3000	30.00	27.50	Active	ROHS3

Engineering Selection Recommendations

Direct Equivalent (Same Specifications):

The 381LQ271M350J032 from Cornell Dubilier is the direct active equivalent. It maintains identical capacitance (270 µF), voltage rating (350 V), tolerance (±20%), and lifetime (2000 hours at 105°C). This part is currently in active production status with 1086 pieces in stock. The primary difference is mechanical: the J032 variant has a smaller diameter (25.00 mm) and greater height (37.00 mm) compared to the original K012 variant. This substitution is suitable when mechanical envelope constraints permit the dimensional variation.

Similar Alternatives (Extended Lifetime):

The 381LX271M350A012 and 381LX271M350K022 from Cornell Dubilier offer extended lifetime ratings of 3000 hours at 105°C, compared to 2000 hours for the original part. Both maintain the 270 µF capacitance, 350 V rating, and ±20% tolerance. The 381LX271M350K022 provides the closest mechanical match with 30.00 mm diameter and 32.00 mm height. These parts are active and suitable for applications requiring improved thermal endurance.

Upgrade Options (Higher Voltage or Extended Lifetime):

The 350VXH270MEFC30X25 from Rubycon provides the most direct mechanical and electrical upgrade, with identical 350 V rating and 30.00 mm diameter and 27.00 mm height. This part offers 5000 hours lifetime at 105°C, representing a 2.5× improvement over the original specification. All RoHS3 compliance is maintained.

Higher voltage alternatives (400 V and 420 V ratings) are available from Rubycon and Chemi-Con. These include 400MXK270MEFC30X25, 420MXK270MEFC30X25, EKMR401VSN271MR25S, and EKMS401VSN271MR25S. These upgrades provide voltage margin and extended operational life while maintaining mechanical compatibility with the original 30.00 mm diameter footprint. All upgrade options are active production parts with ROHS3 compliance.

Frequently Asked Questions (FAQ)

Q: Can the 381LQ271M350J032 be used as a direct replacement for the 381LQ271M350K012?

A: The 381LQ271M350J032 is electrically equivalent with identical capacitance (270 µF), voltage (350 V), tolerance (±20%), and lifetime (2000 hours at 105°C). However, the mechanical dimensions differ: the J032 has a 25.00 mm diameter and 37.00 mm height, compared to 30.00 mm diameter and 27.00 mm height for the K012. Substitution is valid only if the PCB layout and mechanical envelope accommodate these dimensional changes.

Q: What is the advantage of the 350VXH270MEFC30X25 over the original 381LQ271M350K012?

A: The 350VXH270MEFC30X25 from Rubycon maintains identical electrical specifications (270 µF, 350 V, ±20% tolerance) and mechanical dimensions (30.00 mm diameter, 27.00 mm height). The primary advantage is extended lifetime: 5000 hours at 105°C compared to 2000 hours for the original part. This represents a 2.5× improvement in thermal endurance, making it suitable for applications requiring enhanced reliability.

Q: Are higher voltage alternatives (400 V, 420 V) compatible with circuits designed for 350 V?

A: Yes. Higher voltage-rated capacitors are electrically compatible with lower voltage circuit designs. A 400 V or 420 V capacitor can be used in a 350 V circuit without functional degradation. The higher voltage rating provides additional safety margin and does not affect circuit operation. All higher voltage alternatives maintain the 270 µF capacitance and ±20% tolerance required for compatibility.

Q: What is the difference between the 381LX series and the 381LQ series?

A: The 381LX series offers extended lifetime ratings of 3000 hours at 105°C, compared to 2000 hours for the 381LQ series. Both series maintain identical capacitance (270 µF), voltage (350 V), and tolerance (±20%) specifications. The 381LX variants are suitable for applications requiring improved thermal endurance while maintaining the same electrical performance.

Q: Can I use the 400MXK270MEFC30X25 in place of the 381LQ271M350K012?

A: Yes. The 400MXK270MEFC30X25 from Rubycon is mechanically and electrically compatible. It maintains the 270 µF capacitance, ±20% tolerance, and identical 30.00 mm diameter and 27.00 mm height. The 400 V rating provides voltage margin above the original 350 V specification. The 3000-hour lifetime at 105°C exceeds the original 2000-hour rating. This part is suitable for direct substitution with performance enhancement.

Q: Are all substitute parts RoHS3 compliant?

A: Yes. All substitute parts listed maintain ROHS3 compliance, matching the regulatory status of the original 381LQ271M350K012. This ensures compatibility with RoHS3-regulated applications and supply chains.

Q: What is the significance of the lead spacing parameter?

A: Lead spacing (10.00 mm) determines the PCB footprint compatibility. All substitute parts maintain identical 10.00 mm lead spacing, ensuring direct PCB mounting compatibility without layout modifications. This parameter is critical for through-hole component substitution.

Q: Which substitute offers the best overall performance upgrade?

A: The 350VXH270MEFC30X25 from Rubycon provides the optimal upgrade path. It maintains identical mechanical dimensions (30.00 mm diameter, 27.00 mm height) and electrical specifications (270 µF, 350 V, ±20% tolerance) while offering 5000-hour lifetime at 105°C—a 2.5× improvement over the original 2000-hour rating. This part requires no design modifications and delivers measurable reliability enhancement.

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