EEF-UD0E271LR Equivalent & Substitute Parts

Part Overview

The EEF-UD0E271LR is a 270 µF, 2.5 V aluminum polymer capacitor manufactured by Panasonic Electronic Components in the 2917 (7343 Metric) surface mount package. This component is classified as obsolete, making identification of suitable substitute parts essential for ongoing design support and production continuity. 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 9 mOhm.

Substiute Parts

EEF-UD0E271LR

Panasonic Electronic ComponentsIn Stock: 892EEF-UD0E271LR Datasheet

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EEF-SX0D271ER

Panasonic Electronic ComponentsIn Stock: 11657EEF-SX0D271ER Datasheet

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EEF-SX0E271E7

Panasonic Electronic ComponentsIn Stock: 1230EEF-SX0E271E7 Datasheet

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Key Parameters

Substitute Part Grouping Explanation

Substitution of the EEF-UD0E271LR is determined by strict equivalence in the following parameters: capacitance value (270 µF), voltage rating (2.5 V or higher), package type (2917/7343 Metric), and mounting configuration (surface mount). Both substitute parts maintain identical capacitance and voltage specifications while offering improved performance characteristics through extended lifetime ratings and lower ESR values. The substitutes are from the active SP-Cap SX series, providing enhanced reliability compared to the obsolete UD series.

Parameter Comparison

Engineering Selection Recommendations

EEF-SX0E271E7 is the primary substitute for direct replacement of EEF-UD0E271LR. This part maintains identical voltage rating (2.5 V) and capacitance (270 µF) while offering superior performance through doubled lifetime rating (2000 hours versus 1000 hours at 105°C), reduced ESR (7 mOhm versus 9 mOhm), and extended low-temperature operation (-55°C versus -40°C). The part carries active product status with ROHS3 compliance and REACH unaffected certification.

EEF-SX0D271ER serves as an alternative substitute when voltage derating is acceptable. This part operates at 2 V rated voltage, which is 0.5 V lower than the original specification. It provides equivalent ESR (9 mOhm) and doubled lifetime (2000 hours at 105°C) with extended temperature range (-55°C to 105°C). Selection of this part requires circuit-level voltage margin analysis to confirm adequate safety margins.

Frequently Asked Questions (FAQ)

Q: Can EEF-SX0D271ER replace EEF-UD0E271LR in all applications?

A: EEF-SX0D271ER is suitable only when the circuit operates at or below 2 V. The 0.5 V voltage reduction compared to the original 2.5 V rating requires verification that circuit conditions maintain adequate safety margins. If the circuit requires the full 2.5 V rating, use EEF-SX0E271E7.

Q: What are the physical compatibility considerations?

A: Both substitute parts use the identical 2917 (7343 Metric) package with surface mount configuration. EEF-SX0E271E7 has a maximum seated height of 0.079" (2.00 mm) compared to 0.118" (3.00 mm) for the original part. EEF-SX0D271ER also has 0.079" (2.00 mm) height. Verify PCB layout clearances if height reduction affects component placement.

Q: Why is EEF-SX0E271E7 preferred over EEF-SX0D271ER?

A: EEF-SX0E271E7 maintains the original 2.5 V voltage rating, eliminating the need for circuit re-evaluation. It additionally provides lower ESR (7 mOhm versus 9 mOhm) and higher ripple current capability (7 A versus 6.3 A at 100 kHz), delivering improved performance without design modification.

Q: Are there compliance differences between the original and substitute parts?

A: The original EEF-UD0E271LR compliance status is not specified in available documentation. Both substitute parts (EEF-SX0D271ER and EEF-SX0E271E7) are ROHS3 compliant and REACH unaffected, meeting current regulatory requirements for electronic component manufacturing and distribution.

Q: What is the impact of ESR reduction in EEF-SX0E271E7?

A: The reduction from 9 mOhm to 7 mOhm ESR decreases impedance and heat generation during ripple current operation. This improvement enhances thermal performance and extends component life in high-frequency switching applications without requiring circuit modifications.