Equivalent & Substitute Parts for EEF-UD0E271R

Part Overview

The EEF-UD0E271R is a 270 µF, 2.5 V aluminum polymer capacitor in a 2917 (7343 Metric) surface mount package manufactured by Panasonic Electronic Components. This part is classified as obsolete, making identification of suitable alternatives essential for ongoing design support and production continuity. The UD series represents an earlier generation within Panasonic's SP-Cap polymer capacitor lineup. Substitute parts must maintain electrical compatibility while meeting current manufacturing and compliance standards.

Substiute Parts

EEF-UD0E271R

Panasonic Electronic ComponentsIn Stock: 923EEF-UD0E271R Datasheet

Current PartRFQ

EEF-ST0E271R

Panasonic Electronic ComponentsIn Stock: 4400EEF-ST0E271R Datasheet

DirectRFQ

EEF-SX0E271E7

Panasonic Electronic ComponentsIn Stock: 1230EEF-SX0E271E7 Datasheet

SimilarRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution eligibility is determined by strict adherence to the following criteria:

Mandatory Matching Parameters:

• Capacitance: 270 µF (exact match required)
• Voltage Rating: 2.5 V (exact match required)
• Package / Case: 2917 (7343 Metric) (exact match required)
• Mounting Type: Surface Mount (exact match required)
• Tolerance: ±20% or tighter (equal or better)

Acceptable Variation Parameters:

• Operating Temperature Range: Substitute range must encompass or exceed the original -40°C ~ 105°C specification
• ESR: Lower values are acceptable; values equal to or lower than 15 mOhm maintain or improve performance
• Lifetime @ Temperature: Higher values are acceptable and indicate improved reliability

Both identified substitutes (EEF-ST0E271R and EEF-SX0E271E7) meet all mandatory matching criteria and demonstrate improved performance characteristics in ESR and lifetime ratings.

Parameter Comparison

Engineering Selection Recommendations

EEF-ST0E271R (Direct Substitute - Preferred)

The EEF-ST0E271R is classified as a direct manufacturer substitute and is the primary recommendation. This part maintains all mandatory electrical and mechanical parameters while offering significant improvements: ESR is reduced from 15 mOhm to 6 mOhm, lifetime is doubled from 1000 to 2000 hours at 105°C, and the operating temperature range is extended to -55°C ~ 105°C. The part is active in production status and carries ROHS3 and REACH compliance certifications. The reduced height (1.50 mm vs. 3.00 mm) may require PCB layout verification to ensure clearance compatibility.

EEF-SX0E271E7 (Similar Substitute - Alternative)

The EEF-SX0E271E7 is classified as a similar substitute and serves as a secondary option. Performance improvements are comparable to the direct substitute: ESR is reduced to 7 mOhm, lifetime is doubled to 2000 hours at 105°C, and operating temperature range extends to -55°C ~ 105°C. This part is also active in production with ROHS3 and REACH compliance. The intermediate height (2.00 mm) may offer better PCB layout compatibility compared to the direct substitute while maintaining performance advantages over the obsolete original.

Both substitutes are suitable for new designs and production continuity. Selection between them should be based on PCB height constraints and available inventory.

Frequently Asked Questions (FAQ)

Q: Can EEF-ST0E271R or EEF-SX0E271E7 be used as direct replacements for EEF-UD0E271R on existing PCBs?

A: Both substitutes maintain identical electrical specifications (270 µF, 2.5 V, ±20% tolerance) and package footprint (2917 / 7343 Metric). However, the reduced seated heights (1.50 mm and 2.00 mm respectively, compared to 3.00 mm for the original) require verification of PCB clearance and component placement. If height clearance is adequate, both parts are mechanically and electrically compatible.

Q: What is the difference between the "Direct" and "Similar" substitute classifications?

A: The EEF-ST0E271R is designated as a direct substitute, indicating it is the primary recommended replacement within Panasonic's product line. The EEF-SX0E271E7 is designated as a similar substitute, indicating it meets all compatibility criteria but may represent an alternative series or generation. Both are functionally equivalent for this application.

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

A: The original EEF-UD0E271R does not specify RoHS or REACH compliance status. Both substitutes (EEF-ST0E271R and EEF-SX0E271E7) are certified as ROHS3 Compliant and REACH Unaffected, meeting current regulatory requirements for electronic components in most markets.

Q: Why is the ESR lower in the substitute parts?

A: The substitute parts represent newer generations of Panasonic's polymer capacitor technology. Lower ESR (6 mOhm and 7 mOhm versus 15 mOhm) reflects improved internal construction and materials, resulting in reduced heat generation and improved performance in high-frequency applications.

Q: Can I use these substitutes in applications requiring the original -40°C lower temperature limit?

A: Yes. Both substitutes extend the operating temperature range to -55°C ~ 105°C, which encompasses the original specification of -40°C ~ 105°C. The extended lower temperature limit provides additional design margin.

Q: What is the significance of the doubled lifetime rating in the substitutes?

A: The lifetime rating of 2000 hours at 105°C (versus 1000 hours for the original) indicates improved long-term reliability and reduced degradation over extended operation at elevated temperatures. This is a direct benefit of newer polymer capacitor formulations and construction techniques.