SPCX391M02R Equivalent & Substitute Parts Reference

Part Overview

The SPCX391M02R 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, making equivalent and substitute parts necessary for ongoing production and design requirements. The part operates across a temperature range of -40°C to 105°C with a rated lifetime of 1000 hours at 105°C and an ESR of 15 mOhm. Substitute parts must maintain electrical compatibility while meeting current availability and compliance requirements.

Key Parameters

Parameter	Value	Criticality for Substitution
Capacitance	390 µF	Critical - Must match exactly
Voltage Rating	2 V (Direct), 2.5 V (Upgrade)	Critical - Equal or higher acceptable
Tolerance	±20%	Critical - Must match
Package / Case	2917 (7343 Metric)	Critical - Physical compatibility
Mounting Type	Surface Mount	Critical - PCB assembly compatibility
ESR (Equivalent Series Resistance)	15 mOhm (Main), 4.5-15 mOhm (Substitutes)	Important - Affects ripple current handling
Lifetime @ Temperature	1000 Hrs @ 105°C (Main), 2000 Hrs @ 105°C (Substitutes)	Important - Reliability consideration
Operating Temperature Range	-40°C ~ 105°C (Main), -55°C ~ 105°C (Substitutes)	Important - Environmental compatibility
RoHS Status	ROHS3 Compliant	Critical - Regulatory requirement

Substitute Part Grouping Explanation

Substitute parts are grouped into three categories based on electrical and mechanical compatibility with the SPCX391M02R:

Direct Equivalent (Same Voltage Rating - 2V):

EEF-CX0D391R (Panasonic SP-Cap CX series)
EEF-SX0D391E4, EEF-SX0D391ER, EEF-SX0D391XE (Panasonic SP-Cap SX series)

These parts maintain the 2 V voltage rating and 390 µF capacitance. All share the 2917 (7343 Metric) package footprint and surface mount configuration. Differences exist in ESR values (ranging from 4.5 mOhm to 15 mOhm) and ripple current ratings, which affect performance in high-frequency applications but do not prevent substitution in general-purpose circuits.

Upgrade Option (Higher Voltage Rating - 2.5V):

EEF-CX0E391R (Panasonic SP-Cap CX series)

This part provides the same 390 µF capacitance and 2917 package but with a 2.5 V voltage rating. The higher voltage rating provides additional design margin and is electrically compatible in circuits designed for 2 V operation.

Key Substitution Criteria:

Capacitance: 390 µF (all substitutes)
Tolerance: ±20% (all substitutes)
Package: 2917 (7343 Metric) (all substitutes)
Mounting: Surface Mount (all substitutes)
Voltage: 2 V minimum (2.5 V acceptable as upgrade)
RoHS3 Compliance: All substitutes meet this requirement

Parameter Comparison

Part Number	Manufacturer	Capacitance	Voltage	ESR (mOhm)	Lifetime @ 105°C	Temp. Range	Ripple Current @ 100 kHz	Status
SPCX391M02R	Cornell Dubilier	390 µF	2 V	15	1000 Hrs	-40°C ~ 105°C	2.7 A	Obsolete
EEF-CX0D391R	Panasonic	390 µF	2 V	15	2000 Hrs	-55°C ~ 105°C	5.1 A	Active
EEF-CX0E391R	Panasonic	390 µF	2.5 V	15	2000 Hrs	-55°C ~ 105°C	5.1 A	Active
EEF-SX0D391E4	Panasonic	390 µF	2 V	4.5	2000 Hrs	-55°C ~ 105°C	8.5 A	Active
EEF-SX0D391ER	Panasonic	390 µF	2 V	9	2000 Hrs	-55°C ~ 105°C	6.3 A	Active
EEF-SX0D391XE	Panasonic	390 µF	2 V	6	2000 Hrs	-55°C ~ 105°C	7.5 A	Active

Engineering Selection Recommendations

For Direct Replacement (Electrical and Mechanical Compatibility):

EEF-CX0D391R is the primary direct substitute. It maintains identical electrical specifications (390 µF, 2 V, ±20%, 15 mOhm ESR) and physical footprint (2917 package). The part is manufactured by Panasonic, an active product with ROHS3 compliance and REACH unaffected status. The doubled lifetime rating (2000 hours versus 1000 hours at 105°C) and extended operating temperature range (-55°C to 105°C) provide improved reliability margins without requiring circuit redesign.

For High-Ripple-Current Applications:

EEF-SX0D391E4 offers the lowest ESR (4.5 mOhm) and highest ripple current rating (8.5 A @ 100 kHz) among 2 V rated substitutes. This part is suitable for circuits requiring superior high-frequency performance. The SP-Cap SX series maintains the 2917 package and surface mount configuration with active product status and full compliance certifications.

For Voltage-Margin Applications:

EEF-CX0E391R provides a 2.5 V rating while maintaining all other specifications of the direct equivalent. This upgrade option is electrically compatible with 2 V circuit designs and offers additional design margin for voltage transients or future circuit modifications.

Compliance and Availability:

All substitute parts are ROHS3 compliant and REACH unaffected, meeting current regulatory requirements. All are active products with confirmed inventory availability, eliminating obsolescence risk associated with the original SPCX391M02R.

Frequently Asked Questions (FAQ)

Q: Can EEF-CX0E391R (2.5 V) be used in place of SPCX391M02R (2 V)?

A: Yes. The 2.5 V rated part is electrically compatible in circuits designed for 2 V operation. The higher voltage rating does not affect circuit function and provides additional design margin. Physical footprint and mounting type are identical.

Q: What is the difference between EEF-CX0D391R and EEF-SX0D391E4?

A: Both are 390 µF, 2 V, 2917 package parts. EEF-CX0D391R has 15 mOhm ESR and 5.1 A ripple current. EEF-SX0D391E4 has 4.5 mOhm ESR and 8.5 A ripple current. The SX variant is preferred for high-frequency or high-ripple-current applications. Both are active products with 2000-hour lifetime ratings.

Q: Are all substitute parts in the same physical package?

A: Yes. All substitute parts use the 2917 (7343 Metric) package with identical land size (0.287" L x 0.169" W / 7.30mm x 4.30mm). Maximum seated heights vary slightly (1.90mm for CX series, 2.00mm for SX series), but both are within standard PCB assembly tolerances and do not require layout modifications.

Q: Why do substitute parts have longer lifetime ratings (2000 hours versus 1000 hours)?

A: The substitute parts represent current-generation polymer capacitor technology with improved thermal stability and material formulations. The extended lifetime at 105°C reflects improved reliability characteristics of active products compared to the obsolete SPCX391M02R.

Q: Can I mix different substitute parts in the same circuit?

A: Yes, provided the circuit design accommodates the ESR and ripple current variations. Parts with lower ESR (EEF-SX0D391E4 at 4.5 mOhm) handle higher ripple currents than parts with higher ESR (EEF-CX0D391R at 15 mOhm). Circuit analysis should confirm that all parts meet the application's ripple current and thermal requirements.

Q: Are all substitutes available in Tape & Reel packaging?

A: Yes. All substitute parts are supplied in Tape & Reel (TR) packaging, suitable for automated PCB assembly processes. The SPCX391M02R original part was supplied in bulk packaging, so TR format may require adjustment to procurement and handling procedures.

Q: Do substitute parts require any circuit modifications?

A: No. All substitute parts maintain the same capacitance (390 µF), tolerance (±20%), voltage rating (2 V minimum), and package footprint. Direct substitution on the PCB is possible without circuit redesign. The improved ESR and lifetime characteristics of substitutes provide performance benefits without requiring modifications.

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