SPA391M02B Equivalent & Substitute Parts Reference

Part Overview

The SPA391M02B is a 390 µF, 2 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 a 5 mOhm equivalent series resistance (ESR) and 1000 hours lifetime rating at 105°C, designed for general purpose applications requiring low-profile surface mount construction.

Due to obsolete status and limited inventory (779 pieces), 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 compatible alternatives across their SP-Cap series that maintain electrical and mechanical compatibility while providing improved performance characteristics and active production status.

Key Parameters

Parameter	SPA391M02B	Unit	Substitution Relevance
Capacitance	390	µF	Critical - Must match exactly
Voltage Rating	2	V	Critical - Minimum requirement
Tolerance	±20%	%	Critical - Must match or be tighter
Package / Case	2917 (7343 Metric)	-	Critical - PCB footprint compatibility
Mounting Type	Surface Mount	-	Critical - Assembly process compatibility
ESR (Equivalent Series Resistance)	5	mOhm	Important - Affects ripple current handling
Operating Temperature Range	-40 to 105	°C	Important - Thermal performance envelope
Lifetime @ 105°C	1000	Hours	Important - Reliability specification
Ripple Current @ 100 kHz	4	A	Important - Power handling capability
Height - Seated (Max)	0.165	inches (4.20 mm)	Important - PCB clearance and assembly
RoHS Status	ROHS3 Compliant	-	Important - Regulatory compliance

Substitute Part Grouping Explanation

Substitution compatibility for the SPA391M02B is determined by strict adherence to the following electrical and mechanical parameters:

Critical Matching Parameters:

Capacitance value: 390 µF (exact match required)
Voltage rating: Minimum 2 V (equal or higher acceptable)
Tolerance: ±20% (equal or tighter acceptable)
Package: 2917 (7343 Metric) (exact match required for PCB compatibility)
Mounting type: Surface Mount (exact match required)

Performance Parameters (Substitutes must equal or exceed):

ESR: 5 mOhm baseline (lower values acceptable, indicating improved performance)
Ripple current capability: 4 A @ 100 kHz baseline (higher values acceptable)
Lifetime rating: 1000 hours @ 105°C baseline (higher values acceptable)
Operating temperature range: -40°C to 105°C baseline (wider ranges acceptable)

Compliance Parameters:

RoHS3 compliance required
ECCN and HTSUS classifications must align with export/import requirements

The substitute parts listed below maintain all critical parameters while offering equal or superior performance characteristics. All substitutes are manufactured by Panasonic Electronic Components and are available in active production status, ensuring long-term supply chain reliability.

Parameter Comparison

Parameter	SPA391M02B (CDE)	EEF-SX0D391E4 (Panasonic)	EEF-SE0E391ER (Panasonic)	EEF-CX0D391R (Panasonic)	EEF-SX0D391ER (Panasonic)	EEF-SX0D391XE (Panasonic)
Manufacturer	Cornell Dubilier Electronics	Panasonic	Panasonic	Panasonic	Panasonic	Panasonic
Capacitance	390 µF	390 µF	390 µF	390 µF	390 µF	390 µF
Voltage Rating	2 V	2 V	2.5 V	2 V	2 V	2 V
Tolerance	±20%	±20%	±20%	±20%	±20%	±20%
Package / Case	2917 (7343 Metric)	2917 (7343 Metric)	2917 (7343 Metric)	2917 (7343 Metric)	2917 (7343 Metric)	2917 (7343 Metric)
Mounting Type	Surface Mount	Surface Mount	Surface Mount	Surface Mount	Surface Mount	Surface Mount
ESR (Equivalent Series Resistance)	5 mOhm	4.5 mOhm	5 mOhm	15 mOhm	9 mOhm	6 mOhm
Lifetime @ 105°C	1000 Hrs	2000 Hrs	1000 Hrs	2000 Hrs	2000 Hrs	2000 Hrs
Operating Temperature Range	-40°C to 105°C	-55°C to 105°C	-40°C to 105°C	-55°C to 105°C	-55°C to 105°C	-55°C to 105°C
Ripple Current @ 100 kHz	4 A	8.5 A	Not specified	5.1 A	6.3 A	7.5 A
Height - Seated (Max)	0.165" (4.20 mm)	0.079" (2.00 mm)	0.165" (4.20 mm)	0.075" (1.90 mm)	0.079" (2.00 mm)	0.079" (2.00 mm)
Product Status	Obsolete	Active	Obsolete	Active	Active	Active
RoHS Status	ROHS3 Compliant	ROHS3 Compliant	Not specified	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant
Inventory Status	779 Pcs	7245 Pcs	1392 Pcs	1171 Pcs	11808 Pcs	5897 Pcs

Engineering Selection Recommendations

Primary Recommendation: EEF-SX0D391E4

The EEF-SX0D391E4 is the optimal direct replacement for the SPA391M02B. This Panasonic SP-Cap SX series capacitor maintains identical electrical specifications (390 µF, 2 V, ±20% tolerance) and mechanical compatibility (2917 package, surface mount). The substitute provides superior performance with 4.5 mOhm ESR (versus 5 mOhm), doubled lifetime rating (2000 hours versus 1000 hours at 105°C), and significantly higher ripple current capability (8.5 A versus 4 A at 100 kHz). The part is in active production status with substantial inventory availability (7245 pieces), ensuring long-term supply chain reliability. Operating temperature range extends to -55°C, providing wider thermal envelope coverage. RoHS3 compliance and REACH unaffected status confirm regulatory alignment.

Secondary Recommendation: EEF-SX0D391XE

The EEF-SX0D391XE serves as an alternative direct substitute with identical electrical parameters and package compatibility. This SP-Cap SX variant offers 6 mOhm ESR, 2000-hour lifetime rating, and 7.5 A ripple current capability. Height is reduced to 0.079 inches (2.00 mm), providing improved PCB clearance compared to the original 0.165-inch height. Active production status and high inventory (5897 pieces) support procurement continuity.

Tertiary Recommendation: EEF-SX0D391ER

The EEF-SX0D391ER provides direct electrical and mechanical compatibility with 9 mOhm ESR and 2000-hour lifetime rating. This SP-Cap SX series part delivers 6.3 A ripple current capability and reduced height (0.079 inches). Highest inventory availability (11808 pieces) among all substitutes ensures immediate procurement access. Active production status and extended operating temperature range (-55°C to 105°C) support design flexibility.

Alternative for Voltage Margin: EEF-SE0E391ER

The EEF-SE0E391ER offers increased voltage rating (2.5 V versus 2 V) while maintaining identical capacitance, tolerance, and package specifications. This upgrade option provides additional voltage margin for applications requiring enhanced electrical stress tolerance. However, this part is obsolete status, limiting its suitability for new designs despite improved voltage rating.

Not Recommended: EEF-CX0D391R

The EEF-CX0D391R, while maintaining package and electrical compatibility, exhibits significantly higher ESR (15 mOhm versus 5 mOhm baseline). This elevated ESR reduces ripple current handling capability (5.1 A versus 4 A) and increases thermal dissipation. Selection of this part is justified only when height constraints (0.075 inches) are critical design requirements and ESR performance degradation is acceptable.

Frequently Asked Questions (FAQ)

Q: Can EEF-SX0D391E4 be used as a direct drop-in replacement for SPA391M02B?

A: Yes. The EEF-SX0D391E4 maintains identical capacitance (390 µF), voltage rating (2 V), tolerance (±20%), and package (2917 / 7343 Metric). Surface mount footprint and land pattern are compatible. The substitute provides improved ESR (4.5 mOhm versus 5 mOhm) and doubled lifetime rating (2000 hours versus 1000 hours at 105°C), making it functionally superior while maintaining backward compatibility.

Q: What is the significance of the height difference between SPA391M02B (0.165") and substitute parts like EEF-SX0D391E4 (0.079")?

A: The substitute parts feature significantly reduced height, which improves PCB clearance and assembly density. If the original design includes height-constrained clearance zones (such as under low-profile components or within confined enclosures), the reduced height of substitute parts provides additional design margin. Conversely, if the PCB layout relies on the original height for mechanical support or spacing, the reduced height must be evaluated for potential interference. In most applications, reduced height is advantageous and requires no design modification.

Q: Why is EEF-CX0D391R listed as a substitute despite higher ESR?

A: The EEF-CX0D391R maintains all critical electrical parameters (390 µF, 2 V, ±20%) and mechanical compatibility (2917 package, surface mount). While ESR is elevated at 15 mOhm, this part qualifies as a substitute based on strict parameter matching. However, the higher ESR results in reduced ripple current capability (5.1 A versus 4 A) and increased thermal dissipation. Selection of this part is appropriate only when height constraints (0.075 inches) are critical and ESR performance degradation is acceptable for the application.

Q: Are all substitute parts RoHS3 compliant?

A: The primary recommendations (EEF-SX0D391E4, EEF-SX0D391XE, EEF-SX0D391ER, EEF-CX0D391R) are explicitly RoHS3 compliant with REACH unaffected status. The EEF-SE0E391ER does not specify RoHS status in the provided data. For applications requiring verified RoHS3 compliance, confirm with the EEF-SE0E391ER manufacturer or select from the explicitly compliant alternatives.

Q: What is the advantage of the extended operating temperature range (-55°C to 105°C) in substitute parts?

A: The original SPA391M02B operates from -40°C to 105°C. Panasonic substitutes extend the lower temperature limit to -55°C, providing 15°C additional margin for cold environment applications. This wider thermal envelope supports deployment in industrial, automotive, and aerospace environments with more extreme temperature exposure. Applications operating within the original -40°C to 105°C range experience no functional difference.

Q: Can EEF-SE0E391ER (2.5 V rating) be used in place of SPA391M02B (2 V rating)?

A: Yes, from an electrical compatibility perspective. The higher voltage rating (2.5 V versus 2 V) provides additional electrical stress margin and is acceptable in circuits designed for 2 V operation. However, EEF-SE0E391ER is obsolete status, making it unsuitable for new designs or long-term supply chain planning. For voltage margin requirements, select active-status alternatives like EEF-SX0D391E4 or EEF-SX0D391XE, which offer superior availability and production continuity.

Q: How does the doubled lifetime rating (2000 hours versus 1000 hours) affect component selection?

A: The 2000-hour lifetime rating at 105°C in most substitute parts indicates improved reliability and extended operational life under thermal stress. This specification is particularly relevant for applications with continuous operation at elevated temperatures or long-term deployment requirements. The doubled rating provides additional design margin for reliability calculations and supports extended product lifecycle planning. Applications with intermittent operation or lower ambient temperatures experience minimal practical difference.

Q: What packaging format differences exist among the substitute parts?

A: The SPA391M02B is specified with standard packaging (format not detailed). Substitute parts are available in Tape & Reel (TR) or Cut Tape (CT) & Digi-Reel® formats. Tape & Reel packaging is standard for high-volume automated assembly. Cut Tape & Digi-Reel® format supports lower-volume or mixed-component procurement. Both formats are compatible with standard surface mount assembly equipment. Packaging selection depends on procurement volume and assembly process requirements rather than electrical or mechanical compatibility.

Q: Is inventory availability a factor in component selection?

A: Inventory availability is a procurement consideration but not an electrical or mechanical substitution criterion. The SPA391M02B has limited inventory (779 pieces) due to obsolete status. Substitute parts offer significantly higher availability: EEF-SX0D391ER (11808 pieces), EEF-SX0D391E4 (7245 pieces), EEF-SX0D391XE (5897 pieces), and EEF-CX0D391R (1171 pieces). Higher inventory levels support immediate procurement and reduce lead time risk. For new designs or long-term production, select substitutes with active production status and substantial inventory reserves.

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