EEF-SX0D391R Equivalent & Substitute Parts

Part Overview

The EEF-SX0D391R is a 390 µF, 2 V aluminum polymer capacitor in the 2917 (7343 Metric) surface mount package manufactured by Panasonic Electronic Components. This part operates across -55°C to 105°C with a rated lifetime of 2000 hours at 105°C and is compliant with RoHS3 and REACH standards.

The EEF-SX0D391R carries a "Not For New Designs" product status, making it necessary to identify equivalent and substitute components for ongoing production and new design implementations. Suitable alternatives maintain the same capacitance, tolerance, voltage rating, package dimensions, and thermal performance while offering active product status or enhanced electrical characteristics.

Key Parameters

Parameter	Value
Capacitance	390 µF
Tolerance	±20%
Voltage - Rated	2 V
Type	Aluminum - Polymer
Package / Case	2917 (7343 Metric)
ESR (Equivalent Series Resistance)	9 mOhm
Lifetime @ Temperature	2000 Hrs @ 105°C
Operating Temperature Range	-55°C ~ 105°C
Mounting Type	Surface Mount
Size / Dimension	0.287" L x 0.169" W (7.30mm x 4.30mm)

Substitute Part Grouping Explanation

Substitution of the EEF-SX0D391R is determined by strict adherence to the following electrical and mechanical parameters:

Primary Substitution Criteria:

Capacitance: 390 µF (exact match required)
Tolerance: ±20% (exact match required)
Package / Case: 2917 (7343 Metric) (exact match required)
Operating Temperature Range: -55°C ~ 105°C (exact match required)
Mounting Type: Surface Mount (exact match required)
Type: Aluminum - Polymer (exact match required)

Secondary Substitution Parameters (allowable variations):

Voltage - Rated: 2 V or higher
ESR (Equivalent Series Resistance): 9 mOhm or lower
Lifetime @ Temperature: 2000 Hrs @ 105°C or longer
Product Status: Active preferred over "Not For New Designs"

Substitute parts are grouped into three categories based on their relationship to the main part:

Upgrade Substitute: Higher voltage rating (2.5 V) with identical electrical and mechanical specifications, providing enhanced design margin.

Similar Substitutes: Same voltage and capacitance with variations in ESR or series designation, maintaining full electrical compatibility within the 2917 package footprint.

Parametric Equivalent: Identical electrical and mechanical specifications with active product status, providing direct replacement capability.

Parameter Comparison

Part Number	Manufacturer	Capacitance	Voltage - Rated	ESR (mOhm)	Lifetime @ 105°C	Product Status	Series	Inventory (Pcs)
EEF-SX0D391R	Panasonic	390 µF	2 V	9	2000 Hrs	Not For New Designs	SP-Cap SX	889
EEF-SX0E391ER	Panasonic	390 µF	2.5 V	9	2000 Hrs	Active	SP-Cap SX	7335
EEF-CX0D391R	Panasonic	390 µF	2 V	15	2000 Hrs	Active	SP-Cap CX	1171
EEF-SX0D391E4	Panasonic	390 µF	2 V	4.5	2000 Hrs	Active	SP-Cap SX	7245
EEF-SX0D391XE	Panasonic	390 µF	2 V	6	2000 Hrs	Active	SP-Cap SX	5897
EEF-SX0D391ER	Panasonic	390 µF	2 V	9	2000 Hrs	Active	SP-Cap SX	11808

Engineering Selection Recommendations

For Direct Replacement (Identical Specifications with Active Status): EEF-SX0D391ER is the primary recommendation. This part maintains all electrical and mechanical parameters of the EEF-SX0D391R while offering active product status and significantly higher inventory availability (11,808 units versus 889 units). Both parts are RoHS3 compliant and REACH unaffected.

For Enhanced Design Margin (Voltage Upgrade): EEF-SX0E391ER provides a 2.5 V rated voltage while maintaining 390 µF capacitance, 9 mOhm ESR, and identical package dimensions. This upgrade is suitable for applications requiring additional voltage headroom and is actively produced with robust inventory (7,335 units).

For Lower ESR Applications: EEF-SX0D391E4 reduces ESR to 4.5 mOhm (versus 9 mOhm in the main part) while maintaining 2 V rating and 390 µF capacitance. This variant is recommended for high-ripple-current applications requiring improved thermal performance. Active status and high inventory (7,245 units) support production continuity.

For Intermediate ESR Requirement: EEF-SX0D391XE offers 6 mOhm ESR as a middle ground between the main part and the E4 variant, with active status and 5,897 units in stock.

For Series Compatibility (SP-Cap CX): EEF-CX0D391R maintains 2 V rating and 390 µF capacitance but operates within the SP-Cap CX series with 15 mOhm ESR. This part is suitable only when CX series compatibility is required and higher ESR is acceptable.

All recommended substitutes are RoHS3 compliant and REACH unaffected, matching the compliance profile of the original part.

Frequently Asked Questions (FAQ)

Q: Can EEF-SX0E391ER replace EEF-SX0D391R directly on the PCB? A: Yes. EEF-SX0E391ER maintains identical package dimensions (2917 / 7343 Metric), footprint, and mounting type. The 2.5 V rating is a voltage upgrade that does not affect mechanical compatibility. No PCB redesign is required.

Q: What is the difference between EEF-SX0D391E4 and EEF-SX0D391XE? A: Both parts maintain 390 µF capacitance and 2 V rating in the SP-Cap SX series. EEF-SX0D391E4 has 4.5 mOhm ESR with 8.5 A ripple current capability at 100 kHz, while EEF-SX0D391XE has 6 mOhm ESR with 7.5 A ripple current capability. Selection depends on ripple current requirements in the application.

Q: Why is EEF-CX0D391R listed as a substitute if it has higher ESR? A: EEF-CX0D391R is a similar substitute within the same capacitance and voltage class but belongs to the SP-Cap CX series. The 15 mOhm ESR is higher than the main part's 9 mOhm. This part is suitable only when CX series components are specified or when ESR tolerance is not critical to circuit performance.

Q: Are all substitute parts RoHS3 and REACH compliant? A: Yes. All listed substitute parts carry RoHS3 compliance and REACH unaffected status, matching the regulatory profile of EEF-SX0D391R.

Q: What is the advantage of EEF-SX0D391ER over the original EEF-SX0D391R? A: EEF-SX0D391ER is electrically and mechanically identical to EEF-SX0D391R but carries active product status (versus "Not For New Designs"). This ensures long-term availability and production support. Inventory is also significantly higher (11,808 units).

Q: Can I use a 2.5 V rated capacitor in a 2 V circuit? A: Yes. A higher voltage-rated capacitor operates safely in lower voltage applications. EEF-SX0E391ER (2.5 V) is fully compatible with circuits designed for 2 V operation and provides additional design margin.

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