SPSX391M0ER Equivalent & Substitute Parts Reference

Part Overview

The SPSX391M0ER is a 390 µF, 2.5 V aluminum polymer surface mount capacitor manufactured by Cornell Dubilier Electronics (CDE) in the 2917 (7343 Metric) package. This component is classified as obsolete, indicating discontinued production and limited availability. The part features 9 mOhm equivalent series resistance (ESR) and 1000 hours lifetime rating at 105°C, suitable for general purpose applications requiring compact form factor and low impedance characteristics.

Due to obsolete status and finite inventory, identifying equivalent and substitute parts from active manufacturers is essential for design continuity, procurement reliability, and long-term supply chain management. Panasonic Electronic Components offers multiple active alternatives that maintain core electrical and mechanical compatibility.

Substiute Parts

SPSX391M0ER

Cornell Dubilier Electronics (CDE)In Stock: 1054SPSX391M0ER Datasheet

Current PartRFQ

EEF-SX0E391ER

Panasonic Electronic ComponentsIn Stock: 7350EEF-SX0E391ER Datasheet

DirectRFQ

EEF-CX0E391R

Panasonic Electronic ComponentsIn Stock: 1133EEF-CX0E391R Datasheet

SimilarRFQ

EEF-SE0E391ER

Panasonic Electronic ComponentsIn Stock: 1407EEF-SE0E391ER Datasheet

SimilarRFQ

EEF-SX0E391XE

Panasonic Electronic ComponentsIn Stock: 4392EEF-SX0E391XE Datasheet

SimilarRFQ

EEF-SX0E391XR

Panasonic Electronic ComponentsIn Stock: 3620EEF-SX0E391XR Datasheet

SimilarRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution eligibility is determined by strict adherence to the following parameters:

Mandatory Match Criteria:

• Capacitance: 390 µF (exact)
• Voltage Rating: 2.5 V (exact)
• Tolerance: ±20% (exact)
• Package / Case: 2917 (7343 Metric) (exact)
• Mounting Type: Surface Mount (exact)
• Type: Polymer (exact)

Performance Parameters (Allowable Variation):

• ESR: Substitute parts may have ESR values different from 9 mOhm, provided the substitute meets or exceeds the ripple current requirements of the application
• Operating Temperature Range: Substitute parts may have extended ranges (e.g., -55°C ~ 105°C) without restriction
• Lifetime @ Temperature: Substitute parts with equal or greater lifetime ratings are acceptable
• Ripple Current @ High Frequency: Higher ripple current capability indicates improved performance margin

Compliance Parameters:

• RoHS3 Compliance: Required for new designs
• REACH Status: Must be REACH Unaffected or compliant

All identified substitute parts meet these criteria and are sourced from Panasonic Electronic Components, an established manufacturer of aluminum polymer capacitors.

Parameter Comparison

Engineering Selection Recommendations

Primary Recommendation: EEF-SX0E391ER

The EEF-SX0E391ER is the optimal substitute for SPSX391M0ER applications. This part maintains identical ESR (9 mOhm) and capacitance specifications while offering superior reliability characteristics: 2000 hours lifetime at 105°C (versus 1000 hours), extended operating temperature range (-55°C to 105°C), and doubled ripple current capability (6.3 A at 100 kHz). Product status is Active, ensuring long-term availability and supply chain stability. RoHS3 compliance and REACH Unaffected status satisfy regulatory requirements. Tape & Reel packaging supports automated assembly processes. Height reduction to 2.00 mm (from 2.10 mm) provides improved PCB layout flexibility.

Secondary Recommendation: EEF-SX0E391XE

The EEF-SX0E391XE serves as an alternative for applications where lower ESR (6 mOhm) provides performance advantage. This part delivers the highest ripple current capability (7.5 A at 100 kHz) among active alternatives, supporting designs with elevated AC stress requirements. Lifetime rating of 2000 hours at 105°C and extended temperature range (-55°C to 105°C) match EEF-SX0E391ER performance. Active product status and RoHS3 compliance ensure regulatory and supply continuity. Height specification (2.00 mm) is identical to EEF-SX0E391ER.

Alternative for Cost-Sensitive Applications: EEF-CX0E391R

The EEF-CX0E391R offers a cost-effective alternative with acceptable performance trade-offs. ESR of 15 mOhm represents a 67% increase from the original specification; this is acceptable only for applications where ripple current stress is moderate. Ripple current rating of 5.1 A at 100 kHz remains substantially higher than the original 3 A specification. Lifetime rating of 2000 hours at 105°C and extended temperature range provide reliability margin. Active product status and RoHS3 compliance are maintained. Lowest height specification (1.90 mm) offers maximum PCB density advantage.

Not Recommended for New Designs:

• EEF-SE0E391ER: Obsolete status creates future supply risk. Height specification (4.20 mm) exceeds original part by 100%, potentially causing PCB layout conflicts. While ESR of 5 mOhm is superior, obsolescence outweighs performance benefits.

• EEF-SX0E391XR: Product status "Not For New Designs" indicates manufacturer phase-out. Although electrical specifications match EEF-SX0E391XE, design status restricts use to legacy system maintenance only.

Frequently Asked Questions (FAQ)

Q1: Can EEF-CX0E391R be used as a direct replacement for SPSX391M0ER?

A: Yes, EEF-CX0E391R is electrically and mechanically compatible. All mandatory parameters match: 390 µF capacitance, 2.5 V rating, ±20% tolerance, 2917 package, and surface mount configuration. The 15 mOhm ESR represents a 67% increase from the original 9 mOhm specification. This is acceptable provided the application does not require the original ripple current performance (3 A at 100 kHz). The substitute provides 5.1 A ripple current capability, which exceeds the original specification by 70%. Verify that thermal dissipation and voltage ripple characteristics remain within design margins for your specific application.

Q2: What is the significance of ESR differences among substitute parts?

A: Equivalent Series Resistance (ESR) directly affects capacitor impedance, thermal dissipation, and ripple current handling. Lower ESR values (5-6 mOhm) reduce heat generation and support higher AC current stress. Higher ESR values (15 mOhm) increase impedance and thermal output. The original SPSX391M0ER specifies 9 mOhm ESR. Substitutes with lower ESR (EEF-SE0E391ER at 5 mOhm, EEF-SX0E391XE and EEF-SX0E391XR at 6 mOhm) provide performance improvement. The EEF-CX0E391R at 15 mOhm requires verification that application thermal and ripple current budgets accommodate the increased impedance. All substitute parts maintain the same capacitance and voltage rating, so ESR is the primary performance differentiator.

Q3: Why do some substitute parts have different height specifications?

A: Height variation results from different internal construction and polymer formulation among manufacturers. The original SPSX391M0ER specifies 2.10 mm seated height. Panasonic alternatives range from 1.90 mm (EEF-CX0E391R) to 4.20 mm (EEF-SE0E391ER). Reduced height (1.90-2.00 mm) indicates more efficient packaging and supports higher component density on PCBs. Increased height (4.20 mm) reflects different internal architecture. For PCB layout compatibility, verify that the substitute part height does not exceed available clearance. Most active alternatives (EEF-SX0E391ER, EEF-SX0E391XE, EEF-SX0E391XR) specify 2.00 mm, which is compatible with the original 2.10 mm specification with minimal clearance impact.

Q4: What does "Product Status: Active" mean for component selection?

A: Product Status indicates the manufacturer's commitment level to the part. Active status means the manufacturer currently produces the part, maintains it in inventory, and commits to long-term availability. This status is essential for new designs and ensures supply chain reliability. Obsolete status indicates discontinued production with finite remaining inventory; these parts are suitable only for legacy system maintenance or repair. "Not For New Designs" status indicates the manufacturer is phasing out the part but may still fulfill existing orders; this status restricts use to existing designs only. For the SPSX391M0ER (Obsolete), selecting an Active substitute (EEF-SX0E391ER or EEF-SX0E391XE) ensures design continuity and eliminates future supply risk.

Q5: Are all substitute parts RoHS3 compliant?

A: RoHS3 compliance is confirmed for EEF-SX0E391ER, EEF-CX0E391R, EEF-SX0E391XE, and EEF-SX0E391XR. The EEF-SE0E391ER does not specify RoHS3 status in the provided data. For applications requiring RoHS3 compliance (EU and many international markets), select only parts with explicit RoHS3 Compliant designation. All active Panasonic alternatives (EEF-SX0E391ER, EEF-CX0E391R, EEF-SX0E391XE) carry RoHS3 compliance certification, satisfying regulatory requirements for new designs.

Q6: What is the difference between Tape & Reel and Cut Tape packaging?

A: Tape & Reel (TR) packaging supplies components on continuous carrier tape wound on reels, optimized for high-speed automated assembly equipment. This format supports production volumes from hundreds to millions of units with minimal manual handling. Cut Tape (CT) packaging supplies components on cut segments of carrier tape, suitable for lower-volume production, prototyping, and manual assembly. Digi-Reel® is a proprietary packaging format combining cut tape segments on a reel for flexible handling. For production environments using automated pick-and-place equipment, Tape & Reel packaging (EEF-SX0E391ER, EEF-CX0E391R, EEF-SX0E391XE, EEF-SX0E391XR) is standard. For prototype or low-volume builds, Cut Tape packaging (EEF-SE0E391ER) may be acceptable if product status and compliance requirements are satisfied.

Q7: Can substitute parts with extended temperature range (-55°C to 105°C) be used in applications rated only to -40°C?

A: Yes. Extended temperature range capability is a performance enhancement that does not restrict use in narrower temperature applications. If your design operates within -40°C to 105°C, a substitute part rated -55°C to 105°C provides additional thermal margin without penalty. The substitute part will function correctly across your specified operating range. Extended temperature range indicates superior material formulation and manufacturing process, typically associated with higher reliability. This is not a compatibility issue; it is a performance advantage.

Q8: Why is EEF-SX0E391ER recommended over EEF-SX0E391XE despite lower ripple current?

A: EEF-SX0E391ER is recommended as the primary substitute because it maintains identical ESR (9 mOhm) to the original SPSX391M0ER, ensuring direct electrical equivalence. This eliminates the need for thermal and ripple current re-analysis. EEF-SX0E391XE offers superior ripple current (7.5 A versus 6.3 A) but with lower ESR (6 mOhm), which changes the impedance profile. For designs where the original 9 mOhm ESR was specifically selected, EEF-SX0E391ER provides the most direct substitution path. EEF-SX0E391XE is preferred only when lower ESR and higher ripple current capability provide specific design advantages (e.g., reduced thermal dissipation, higher AC stress tolerance).