EEF-UD0D271LE Equivalent & Substitute Parts

Part Overview

The EEF-UD0D271LE is a 270 µF, 2 V aluminum polymer surface mount capacitor manufactured by Panasonic Electronic Components in the 2917 (7343 Metric) package. This part operates across a temperature range of -40°C to 105°C with a rated lifetime of 1000 hours at 105°C and an equivalent series resistance (ESR) of 9 mOhm.

The EEF-UD0D271LE is classified as obsolete. Locating direct replacements from current production inventory requires evaluation of active alternative models that maintain electrical and mechanical compatibility while meeting modern reliability and compliance standards.

Substiute Parts

EEF-UD0D271LE

Panasonic Electronic ComponentsIn Stock: 796EEF-UD0D271LE Datasheet

Current PartRFQ

EEF-SX0D271ER

Panasonic Electronic ComponentsIn Stock: 11657EEF-SX0D271ER Datasheet

DirectRFQ

EEF-CX0D271XR

Panasonic Electronic ComponentsIn Stock: 992EEF-CX0D271XR Datasheet

SimilarRFQ

EEF-SX0D271E4

Panasonic Electronic ComponentsIn Stock: 12785EEF-SX0D271E4 Datasheet

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EEF-SX0D271R

Panasonic Electronic ComponentsIn Stock: 10731EEF-SX0D271R Datasheet

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EEF-SX0D271XE

Panasonic Electronic ComponentsIn Stock: 1059EEF-SX0D271XE Datasheet

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Key Parameters

Substitute Part Grouping Explanation

Substitution of the EEF-UD0D271LE is determined by the following critical parameters:

• Electrical Parameters: Capacitance (270 µF), voltage rating (2 V), and tolerance (±20%) must remain constant
• Package Compatibility: All substitutes must use the 2917 (7343 Metric) surface mount package with identical land pattern dimensions (7.30 mm × 4.30 mm)
• Mechanical Fit: Height and physical dimensions must accommodate the original PCB layout
• Performance Characteristics: ESR and lifetime ratings determine suitability for specific applications

The substitute parts identified below maintain these core electrical and mechanical specifications while offering improvements in reliability (extended lifetime ratings) and compliance certifications. Variations in ESR and ripple current capacity reflect different internal construction within the same package envelope.

Parameter Comparison

Engineering Selection Recommendations

Primary Recommendation: EEF-SX0D271ER

The EEF-SX0D271ER is the direct functional equivalent of the EEF-UD0D271LE. It maintains identical electrical specifications (270 µF, 2 V, 9 mOhm ESR) while offering doubled lifetime rating (2000 hours at 105°C versus 1000 hours) and extended operating temperature range (-55°C to 105°C). The part is in active production status with ROHS3 compliance and REACH unaffected certification. Physical height is reduced from 3.00 mm to 2.00 mm, which improves PCB layout flexibility without affecting electrical performance.

Alternative Options Based on Application Requirements:

EEF-SX0D271E4 is suitable for applications requiring lower ESR (4.5 mOhm) and higher ripple current capacity (8.5 A @ 100 kHz). This part maintains active production status and full compliance certifications.

EEF-SX0D271XE provides intermediate ESR performance (6 mOhm) with active status and compliance certifications, offering a balance between the ER and E4 variants.

EEF-CX0D271XR is available for space-constrained designs requiring minimum height (1.90 mm). ESR is slightly elevated at 12 mOhm with correspondingly lower ripple current capacity (5.6 A @ 100 kHz). This part maintains active status and full compliance.

EEF-SX0D271R is not recommended for new designs despite active inventory availability, as its product status designation restricts its use in ongoing development programs.

Frequently Asked Questions (FAQ)

Q: Can EEF-SX0D271ER directly replace EEF-UD0D271LE without PCB modification?

A: Yes. Both parts use the 2917 (7343 Metric) package with identical land pattern dimensions (7.30 mm × 4.30 mm). The reduced height of the EEF-SX0D271ER (2.00 mm versus 3.00 mm) does not prevent direct substitution and may improve clearance in constrained assemblies.

Q: What is the significance of ESR variation among substitute parts?

A: ESR affects ripple current handling and thermal performance. Lower ESR (EEF-SX0D271E4 at 4.5 mOhm) reduces heat generation and supports higher ripple currents. Higher ESR (EEF-CX0D271XR at 12 mOhm) is acceptable for general-purpose applications with moderate ripple current demands. The original EEF-UD0D271LE at 9 mOhm is matched by EEF-SX0D271ER and EEF-SX0D271R.

Q: Are all substitute parts RoHS3 compliant?

A: Yes. All active substitute parts listed (EEF-SX0D271ER, EEF-SX0D271E4, EEF-SX0D271XE, and EEF-CX0D271XR) are ROHS3 compliant with REACH unaffected status. The original EEF-UD0D271LE compliance status is not specified in available documentation.

Q: Why is EEF-SX0D271R marked "Not For New Designs"?

A: This designation indicates the part is in managed decline. While current inventory exists, Panasonic restricts its use in new product development. For new designs, select from parts with "Active" status: EEF-SX0D271ER, EEF-SX0D271E4, EEF-SX0D271XE, or EEF-CX0D271XR.

Q: What is the practical difference between 1000-hour and 2000-hour lifetime ratings?

A: Lifetime rating indicates expected operational duration at maximum rated temperature (105°C). The doubled rating of substitute parts reflects improved polymer formulation and construction. For applications operating below 105°C, actual service life extends proportionally beyond the rated specification.

Q: Can I use EEF-CX0D271XR in a design originally specified for EEF-UD0D271LE?

A: Yes, with consideration of ESR and ripple current requirements. The EEF-CX0D271XR maintains identical electrical specifications (270 µF, 2 V, ±20%) and package footprint. The 12 mOhm ESR is higher than the original 9 mOhm, which may increase heat generation in high-ripple-current applications. Verify that application ripple current does not exceed 5.6 A @ 100 kHz.