Equivalent & Substitute Parts for 2SW390M

Part Overview

The 2SW390M is a 390 µF, 2 V aluminum polymer capacitor manufactured by Rubycon in the 2917 (7343 Metric) surface mount package. This component is designed for general purpose applications requiring low ESR and stable performance across extended temperature ranges. The part is currently obsolete, making identification of suitable equivalent components essential for ongoing design support, legacy system maintenance, and production continuity.

Key Parameters

Parameter	Value
Capacitance	390 µF
Voltage Rating	2 V
Type	Aluminum Polymer
Package	2917 (7343 Metric)
ESR	9 mOhm
Lifetime	2000 Hrs @ 105°C
Operating Temperature Range	-55°C ~ 105°C
Mounting Type	Surface Mount

Substitute Part Grouping Explanation

Substitution of the 2SW390M is determined by strict equivalence across the following critical parameters:

Capacitance Value: 390 µF (±20% tolerance acceptable)
Voltage Rating: 2 V minimum
Package Designation: 2917 (7343 Metric) surface mount
Dielectric Type: Aluminum polymer
ESR Specification: 9 mOhm maximum
Thermal Performance: 2000 Hrs @ 105°C minimum lifetime rating
Operating Temperature Range: -55°C ~ 105°C minimum coverage

The substitute part EEF-SX0D391ER meets all these criteria and is therefore a direct functional equivalent for the obsolete 2SW390M.

Parameter Comparison

Parameter	2SW390M (Rubycon)	EEF-SX0D391ER (Panasonic)	Match Status
Capacitance	390 µF	390 µF	Equivalent
Tolerance	±20%	±20%	Equivalent
Voltage Rating	2 V	2 V	Equivalent
Type	Aluminum Polymer	Aluminum Polymer	Equivalent
ESR @ 100 kHz	9 mOhm	9 mOhm	Equivalent
Lifetime @ 105°C	2000 Hrs	2000 Hrs	Equivalent
Operating Temperature	-55°C ~ 105°C	-55°C ~ 105°C	Equivalent
Package	2917 (7343 Metric)	2917 (7343 Metric)	Equivalent
Mounting Type	Surface Mount	Surface Mount	Equivalent
Ripple Current @ 100 kHz	4.6 A	6.3 A	Substitute Exceeds
Height (Seated Max)	0.114" (2.90 mm)	0.079" (2.00 mm)	Substitute Lower Profile
Product Status	Obsolete	Active	Substitute Active
RoHS Status	ROHS3 Compliant	ROHS3 Compliant	Equivalent

Engineering Selection Recommendations

The EEF-SX0D391ER from Panasonic is a direct functional equivalent for the obsolete 2SW390M. Both components share identical electrical specifications across all critical parameters: capacitance, voltage rating, ESR, thermal lifetime, and operating temperature range. Both are ROHS3 compliant and carry equivalent regulatory status.

The Panasonic substitute offers two additional advantages: active product status ensures ongoing availability and supply chain continuity, and a lower seated height (2.00 mm versus 2.90 mm) provides improved board layout flexibility. The higher ripple current rating (6.3 A versus 4.6 A) represents enhanced performance margin without introducing any compatibility concerns.

For applications requiring the 2SW390M, the EEF-SX0D391ER is suitable for direct substitution without circuit redesign or performance degradation.

Frequently Asked Questions (FAQ)

Q: Can the EEF-SX0D391ER replace the 2SW390M in existing designs?

A: Yes. Both components meet identical electrical and mechanical specifications across all critical parameters. The substitute is pin-compatible, footprint-compatible, and electrically equivalent.

Q: What is the significance of the different ripple current ratings?

A: The EEF-SX0D391ER has a higher ripple current rating (6.3 A @ 100 kHz) compared to the 2SW390M (4.6 A @ 100 kHz). This represents improved performance margin and does not create compatibility issues. The substitute can handle higher ripple current stress without degradation.

Q: Does the lower height of the substitute affect PCB layout?

A: The EEF-SX0D391ER has a lower seated height (2.00 mm versus 2.90 mm). This is a physical advantage that improves board clearance and layout flexibility. No design modifications are required.

Q: Are both components RoHS compliant?

A: Yes. Both the 2SW390M and EEF-SX0D391ER are ROHS3 compliant and carry equivalent regulatory status.

Q: Why is the 2SW390M obsolete while the substitute remains active?

A: Product lifecycle decisions are manufacturer-specific. The EEF-SX0D391ER remains in active production by Panasonic, ensuring continued availability and supply chain stability for equivalent functionality.

Q: What packaging options are available for the substitute?

A: The EEF-SX0D391ER is supplied in Tape & Reel (TR) packaging, standard for high-volume surface mount assembly operations.

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