ESRE391M02XB Equivalent & Substitute Parts Reference

Part Overview

The ESRE391M02XB 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 designed for bypass and decoupling applications in low-voltage electronic circuits. The part is currently classified as obsolete, making identification of compatible substitute components essential for ongoing design support, production continuity, and system maintenance.

Substiute Parts

ESRE391M02XB

Cornell Dubilier Electronics (CDE)In Stock: 843ESRE391M02XB Datasheet

Current PartRFQ

EEF-SX0D391ER

Panasonic Electronic ComponentsIn Stock: 11874EEF-SX0D391ER Datasheet

DirectRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution eligibility for the ESRE391M02XB is determined by strict alignment with the following critical parameters:

Mandatory Matching Parameters:

• Capacitance: 390 µF (exact match required)
• Voltage Rating: 2 V (minimum; higher ratings acceptable)
• Package / Case: 2917 (7343 Metric) (exact match required for PCB compatibility)
• Mounting Type: Surface Mount (exact match required)
• Dielectric Type: Aluminum Polymer (exact match required)
• Operating Temperature Range: -55°C ~ 105°C (minimum; extended ranges acceptable)
• RoHS Compliance: ROHS3 Compliant (regulatory requirement)

Performance Parameters (Enhancement Acceptable):

• ESR (Equivalent Series Resistance): Lower values indicate improved performance
• Ripple Current Capability: Higher values indicate improved performance
• Lifetime @ Temperature: Higher values indicate improved reliability

The substitute part EEF-SX0D391ER meets all mandatory matching criteria and provides enhanced performance characteristics in ESR, ripple current, and thermal lifetime.

Parameter Comparison

Engineering Selection Recommendations

The EEF-SX0D391ER from Panasonic Electronic Components is a direct electrical and mechanical substitute for the obsolete ESRE391M02XB. Selection is based on the following engineering criteria:

Electrical Compatibility: Both parts share identical capacitance (390 µF), voltage rating (2 V), tolerance (±20%), and dielectric technology (aluminum polymer). The substitute meets all mandatory electrical specifications for direct replacement in bypass and decoupling applications.

Physical Compatibility: Both parts use the 2917 (7343 Metric) surface mount package with identical land pattern dimensions (0.287" L x 0.169" W / 7.30 mm x 4.30 mm). The substitute has a lower seated height (0.079" vs. 0.161"), which provides improved PCB clearance and does not create compatibility issues.

Regulatory Compliance: Both parts are ROHS3 compliant and carry identical ECCN (EAR99) and HTSUS (8532.22.0020) classifications, ensuring regulatory equivalence for procurement and export purposes.

Performance Enhancement: The substitute offers measurable improvements in ESR (9 mOhm vs. 10 mOhm), ripple current capability (6.3 A vs. 3.5 A @ 100 kHz), and thermal lifetime (2000 Hrs vs. 1000 Hrs @ 105°C). These enhancements provide superior performance margins without introducing any compatibility constraints.

Product Availability: The substitute is classified as active product with confirmed inventory (11,808 pcs), ensuring long-term supply continuity compared to the obsolete main part.

Frequently Asked Questions (FAQ)

Q: Can the EEF-SX0D391ER be used as a direct replacement for the ESRE391M02XB without PCB modifications?

A: Yes. Both parts use the identical 2917 (7343 Metric) surface mount package with matching land pattern dimensions. No PCB layout changes are required. The substitute's lower profile (0.079" vs. 0.161") provides additional clearance margin.

Q: Are there any electrical performance differences between these parts?

A: Both parts meet identical electrical specifications for capacitance, voltage, and tolerance. The substitute offers improved performance in ESR (9 mOhm vs. 10 mOhm), ripple current (6.3 A vs. 3.5 A @ 100 kHz), and thermal lifetime (2000 Hrs vs. 1000 Hrs @ 105°C). These differences represent enhancements, not deviations.

Q: What is the significance of the lower seated height of the substitute part?

A: The EEF-SX0D391ER has a maximum seated height of 0.079" (2.00 mm) compared to 0.161" (4.10 mm) for the ESRE391M02XB. This lower profile improves available clearance above the component on the PCB and does not create any compatibility issues. Verify that your PCB design accommodates this dimension.

Q: Are both parts RoHS compliant?

A: Yes. Both the ESRE391M02XB and EEF-SX0D391ER are ROHS3 compliant, ensuring regulatory equivalence for applications subject to RoHS requirements.

Q: What is the packaging difference between these parts?

A: The main part (ESRE391M02XB) is supplied in standard packaging. The substitute (EEF-SX0D391ER) is supplied in Tape & Reel (TR) format, which is standard for high-volume surface mount assembly. Both formats are compatible with automated pick-and-place equipment.

Q: Why is the main part classified as obsolete?

A: The ESRE391M02XB is no longer manufactured by Cornell Dubilier Electronics. The EEF-SX0D391ER from Panasonic is an active product with confirmed ongoing production and inventory availability.

Q: Can I use a higher voltage rated capacitor as a substitute?

A: For this specific application, the 2 V rating is the standard specification. While higher voltage ratings are electrically compatible, they typically result in larger package sizes or different form factors. The EEF-SX0D391ER maintains the 2 V rating and identical package, making it the appropriate substitute.

Q: What is the thermal lifetime specification, and why does it matter?

A: Thermal lifetime (measured in hours at 105°C) indicates the expected operational duration under maximum temperature conditions. The substitute's 2000 Hrs @ 105°C rating (vs. 1000 Hrs for the main part) provides extended reliability margin for applications operating at elevated temperatures.