SPA391M02R Equivalent & Substitute Parts

Part Overview

The SPA391M02R is a 390 µF, 2 V aluminum-polymer surface mount capacitor manufactured by Cornell Dubilier Electronics (CDE) in the 2917 (7343 Metric) package. The product is currently obsolete, making it necessary to identify and qualify equivalent or superior substitute components for ongoing designs and device maintenance. Substitute parts must match or exceed the electrical and mechanical specifications to ensure circuit functionality and reliability.

Substiute Parts

SPA391M02R

Cornell Dubilier Electronics (CDE)In Stock: 812SPA391M02R Datasheet

Current PartRFQ

EEF-SX0D391E4

Panasonic Electronic ComponentsIn Stock: 7351EEF-SX0D391E4 Datasheet

DirectRFQ

EEF-SE0E391ER

Panasonic Electronic ComponentsIn Stock: 1407EEF-SE0E391ER Datasheet

UpgradeRFQ

EEF-CX0D391R

Panasonic Electronic ComponentsIn Stock: 1193EEF-CX0D391R Datasheet

SimilarRFQ

EEF-SX0D391ER

Panasonic Electronic ComponentsIn Stock: 11874EEF-SX0D391ER Datasheet

SimilarRFQ

EEF-SX0D391XE

Panasonic Electronic ComponentsIn Stock: 5978EEF-SX0D391XE Datasheet

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Key Parameters

Substitute Part Grouping Explanation

Substitute parts for the SPA391M02R are categorized based on the following critical parameters:

• Capacitance: Must be 390 µF ±20%
• Voltage Rating: Minimum 2 V (equal or higher voltage ratings are acceptable)
• Package / Case: Must be 2917 (7343 Metric)
• Mounting Type: Surface Mount
• Tolerance: ±20%

Parts are grouped into two categories:

Direct Equivalents (2 V Rated): EEF-SX0D391E4, EEF-CX0D391R, EEF-SX0D391ER, and EEF-SX0D391XE. These parts maintain the original 2 V voltage rating and identical capacitance, making them direct functional replacements with possible improvements in ESR, lifetime, and ripple current handling.

Voltage Upgrade (2.5 V Rated): EEF-SE0E391ER. This part provides a higher voltage rating (2.5 V) while maintaining the same capacitance and package, allowing operation in circuits with slightly elevated voltage margins. This part is obsolete, limiting its practical application for new designs.

Parameter Comparison

Engineering Selection Recommendations

Preferred Substitutes (Active Status):

EEF-SX0D391E4 is the primary recommended substitute. As an active product from Panasonic, it offers superior electrical performance with reduced ESR (4.5 mOhm versus 5 mOhm), doubled lifetime (2000 Hrs versus 1000 Hrs @ 105°C), and significantly higher ripple current capacity (8.5 A versus 4 A @ 100 kHz). The extended operating temperature range (-55°C to 105°C) provides additional design margin.

EEF-SX0D391XE offers a balance between performance and cost, providing 2000 Hrs lifetime and 7.5 A ripple current with 6 mOhm ESR while maintaining active product status.

EEF-SX0D391ER is suitable for applications requiring moderate performance improvements, with 2000 Hrs lifetime and 6.3 A ripple current handling, though its 9 mOhm ESR is higher than the original specification.

EEF-CX0D391R, while active and meeting lifetime requirements, exhibits significantly higher ESR (15 mOhm) and should be considered only when ESR constraints are relaxed.

Voltage Upgrade Option:

EEF-SE0E391ER provides a 2.5 V rating but is obsolete, limiting its practical value for new designs. Its specifications match the original part in ESR and lifetime, making it unsuitable as a long-term solution.

Compliance Consideration:

All substitute parts are ROHS3 compliant and meet REACH requirements, matching the original part's environmental standards.

Frequently Asked Questions (FAQ)

Q: Can EEF-SX0D391E4 be used as a direct replacement for SPA391M02R?

A: Yes. Both parts share identical capacitance (390 µF), voltage rating (2 V), tolerance (±20%), and package (2917/7343 Metric). EEF-SX0D391E4 provides improved electrical characteristics including lower ESR, extended lifetime, and higher ripple current capacity.

Q: What is the primary difference between EEF-SX0D391E4 and EEF-SX0D391XE?

A: Both are active Panasonic SP-Cap SX series parts with identical electrical ratings. The primary difference is ESR: EEF-SX0D391E4 has 4.5 mOhm while EEF-SX0D391XE has 6 mOhm. EEF-SX0D391E4 also supports higher ripple current (8.5 A versus 7.5 A @ 100 kHz).

Q: Why does EEF-CX0D391R have such higher ESR than other substitutes?

A: EEF-CX0D391R belongs to the SP-Cap CX series, which has different internal construction than the SX series. The higher ESR (15 mOhm) is a characteristic of this series design and may impact performance in applications sensitive to impedance.

Q: Can EEF-SE0E391ER replace SPA391M02R in new designs?

A: Not recommended. Although it provides a higher voltage rating (2.5 V), it is obsolete and offers no performance improvements over the original part. Active substitutes provide superior reliability and availability.

Q: Are there temperature range considerations when substituting?

A: Yes. The original SPA391M02R operates from -40°C to 105°C. Most active substitutes extend this range to -55°C to 105°C, providing additional design margin. If circuits operate only within the original -40°C to 105°C range, this difference is not a limiting factor.

Q: Is packaging compatibility guaranteed across all substitutes?

A: All substitutes use the 2917 (7343 Metric) package with identical land size (0.287" L x 0.169" W). However, physical height varies: the original part and EEF-SE0E391ER are 0.165" (4.20 mm) tall, while EEF-SX0D391E4, EEF-SX0D391XE are 0.079" (2.00 mm), and EEF-CX0D391R is 0.075" (1.90 mm). Verify board clearance before final selection.