Panasonic EEF-SX0D391XR Equivalent & Substitute Parts

Part Overview

The Panasonic EEF-SX0D391XR is a 390 µF, 2 V aluminum polymer capacitor in the 2917 (7343 Metric) surface mount package. This component is classified as "Not For New Designs," indicating it has been superseded in Panasonic's product portfolio. Organizations using this part number in active designs require equivalent or substitute components that maintain electrical and mechanical compatibility while meeting current design standards.

Substiute Parts

EEF-SX0D391XR

Panasonic Electronic ComponentsIn Stock: 918EEF-SX0D391XR Datasheet

Current PartRFQ

EEF-SX0E391XE

Panasonic Electronic ComponentsIn Stock: 4392EEF-SX0E391XE Datasheet

UpgradeRFQ

EEF-SX0E391XR

Panasonic Electronic ComponentsIn Stock: 3620EEF-SX0E391XR Datasheet

UpgradeRFQ

EEF-CX0D391R

Panasonic Electronic ComponentsIn Stock: 1193EEF-CX0D391R Datasheet

SimilarRFQ

EEF-SX0D391E4

Panasonic Electronic ComponentsIn Stock: 7351EEF-SX0D391E4 Datasheet

SimilarRFQ

EEF-SX0D391ER

Panasonic Electronic ComponentsIn Stock: 11874EEF-SX0D391ER Datasheet

SimilarRFQ

EEF-SX0D391XE

Panasonic Electronic ComponentsIn Stock: 5978EEF-SX0D391XE Datasheet

Parametric EquivalentRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution of the EEF-SX0D391XR is determined by the following criteria:

Primary Substitution Parameters:

• Capacitance: 390 µF (exact match required)
• Tolerance: ±20% (exact match required)
• Package / Case: 2917 (7343 Metric) (exact match required)
• Mounting Type: Surface Mount (exact match required)
• Physical Dimensions: 0.287" L x 0.169" W, Height ≤ 0.079" (exact match required)

Secondary Substitution Parameters:

• Voltage Rating: 2 V or higher (higher voltage ratings are acceptable)
• ESR: 6 mOhm or lower (lower ESR values are acceptable)
• Operating Temperature Range: -55°C ~ 105°C (exact match required)
• Lifetime @ Temperature: 2000 Hrs @ 105°C (exact match required)

Substitution Categories:

Upgrade Parts (Higher voltage rating, same or better ESR):

• EEF-SX0E391XE: 2.5 V rated, 6 mOhm ESR, Active status
• EEF-SX0E391XR: 2.5 V rated, 6 mOhm ESR, Not For New Designs status

Similar Parts (Same voltage rating, different ESR or series):

• EEF-CX0D391R: 2 V rated, 15 mOhm ESR, SP-Cap CX series, Active status
• EEF-SX0D391E4: 2 V rated, 4.5 mOhm ESR, SP-Cap SX series, Active status
• EEF-SX0D391ER: 2 V rated, 9 mOhm ESR, SP-Cap SX series, Active status

Parametric Equivalent (Identical electrical and mechanical specifications):

• EEF-SX0D391XE: 2 V rated, 6 mOhm ESR, SP-Cap SX series, Active status

Parameter Comparison

Engineering Selection Recommendations

For Direct Replacement (Parametric Equivalent): EEF-SX0D391XE is the parametric equivalent with identical electrical specifications (390 µF, 2 V, 6 mOhm ESR) and Active product status. This part maintains all original design parameters while offering improved availability and current manufacturing support.

For Voltage Margin Enhancement: EEF-SX0E391XE provides a 2.5 V rating with identical ESR and capacitance, offering increased voltage headroom for the same electrical performance. This part carries Active status and represents the recommended upgrade path for new designs.

For ESR Optimization: EEF-SX0D391E4 delivers lower ESR (4.5 mOhm versus 6 mOhm) at the original 2 V rating, suitable for applications requiring reduced ripple current performance. This part is Active and available in high volume.

For Cost-Optimized Selection: EEF-SX0D391ER maintains the original 2 V rating with 9 mOhm ESR and offers the highest inventory availability (11,808 Pcs). This part is suitable for applications where ESR tolerance permits the higher value.

Compliance Considerations: All substitute parts maintain ROHS3 compliance and REACH Unaffected status, matching the original part's regulatory standing. All parts are packaged in Tape & Reel format suitable for automated assembly.

Frequently Asked Questions (FAQ)

Q: Can EEF-SX0E391XE replace EEF-SX0D391XR directly on the PCB? A: Yes. EEF-SX0E391XE is a direct mechanical and electrical substitute with identical package dimensions (2917), height (0.079"), and footprint. The 2.5 V rating is backward compatible with 2 V circuit requirements.

Q: What is the difference between EEF-SX0D391XE and EEF-SX0D391XR? A: Both parts are parametrically identical (390 µF, 2 V, 6 mOhm ESR, 2917 package). The primary difference is product status: EEF-SX0D391XE is Active, while EEF-SX0D391XR is Not For New Designs. EEF-SX0D391XE is the recommended selection for new designs.

Q: Why does EEF-CX0D391R have a lower height (0.075" vs 0.079")? A: EEF-CX0D391R belongs to the SP-Cap CX series, which uses different internal construction. While it maintains the same 2917 package designation and footprint, the seated height is 0.004" lower. Verify PCB clearance before substitution.

Q: Is lower ESR always better? A: Lower ESR reduces ripple current and heat generation, beneficial for high-frequency applications. However, circuit design determines whether ESR variation is acceptable. EEF-SX0D391E4 (4.5 mOhm) and EEF-SX0D391ER (9 mOhm) represent alternative ESR options within the same voltage and capacitance specification.

Q: Can I use a 2.5 V rated part in a 2 V circuit? A: Yes. Higher voltage ratings are acceptable in lower voltage applications. EEF-SX0E391XE and EEF-SX0E391XR (both 2.5 V) function correctly in 2 V circuits with no performance degradation.

Q: What inventory considerations apply to these substitutes? A: EEF-SX0D391ER offers the highest availability (11,808 Pcs), followed by EEF-SX0D391E4 (7,245 Pcs) and EEF-SX0D391XE (5,897 Pcs). The original EEF-SX0D391XR has limited stock (841 Pcs), supporting the transition to Active alternatives.

Q: Are all these parts suitable for automated assembly? A: Yes. All substitute parts are supplied in Tape & Reel (TR) packaging, standard for surface mount automated assembly processes.