EEF-UD0D271LR Equivalent & Substitute Parts

Part Overview

The EEF-UD0D271LR 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 -40°C to 105°C with a rated lifetime of 1000 hours at 105°C and carries an ESR of 9mOhm. The product is currently obsolete, necessitating identification of active equivalent alternatives that maintain electrical and mechanical compatibility for new designs and ongoing production requirements.

Key Parameters

Parameter	Value
Capacitance	270 µF
Voltage Rating	2 V
Tolerance	±20%
Package / Case	2917 (7343 Metric)
Mounting Type	Surface Mount
ESR (Equivalent Series Resistance)	9mOhm
Lifetime @ Temperature	1000 Hrs @ 105°C
Operating Temperature Range	-40°C ~ 105°C
Type	Polymer
Product Status	Obsolete

Substitute Part Grouping Explanation

Substitution eligibility is determined by strict alignment with the following core parameters:

Capacitance: 270 µF (exact match required)
Voltage Rating: 2 V (exact match required)
Tolerance: ±20% (exact match required)
Package / Case: 2917 (7343 Metric) (exact match required)
Mounting Type: Surface Mount (exact match required)
Type: Polymer (exact match required)

All substitute parts listed below meet these mandatory criteria. Variations in ESR, lifetime rating, operating temperature range, and ripple current capacity are permitted within the electrical and mechanical constraints of this product category. All substitute parts are manufactured by Panasonic Electronic Components and are available in active production status or designated for continued use.

Parameter Comparison

Part Number	Series	ESR (mOhm)	Lifetime @ 105°C	Operating Temp. Range	Height - Seated (Max)	Product Status	Packaging
EEF-UD0D271LR	SP-Cap UD	9	1000 Hrs	-40°C ~ 105°C	0.118" (3.00mm)	Obsolete	Bulk
EEF-SX0D271ER	SP-Cap SX	9	2000 Hrs	-55°C ~ 105°C	0.079" (2.00mm)	Active	Tape & Reel (TR)
EEF-SX0D271E4	SP-Cap SX	4.5	2000 Hrs	-55°C ~ 105°C	0.079" (2.00mm)	Active	Tape & Reel (TR)
EEF-SX0D271XE	SP-Cap SX	6	2000 Hrs	-55°C ~ 105°C	0.079" (2.00mm)	Active	Tape & Reel (TR)
EEF-SX0D271R	SP-Cap SX	9	2000 Hrs	-55°C ~ 105°C	0.079" (2.00mm)	Not For New Designs	Tape & Reel (TR)
EEF-CX0D271XR	SP-Cap CX	12	2000 Hrs	-55°C ~ 105°C	0.075" (1.90mm)	Active	Tape & Reel (TR)

Engineering Selection Recommendations

Primary Recommendation: EEF-SX0D271ER

EEF-SX0D271ER is the direct equivalent substitute. It maintains identical capacitance, voltage rating, tolerance, package, and ESR specifications while offering extended lifetime (2000 hours at 105°C versus 1000 hours), expanded operating temperature range (-55°C to 105°C), and reduced physical height. The part is in active production status with ROHS3 compliance and REACH unaffected certification. This part is suitable for new designs and production transitions.

Secondary Recommendations: EEF-SX0D271E4 and EEF-SX0D271XE

Both parts are active production alternatives with identical core electrical parameters. EEF-SX0D271E4 offers the lowest ESR at 4.5mOhm with highest ripple current capacity (8.5 A @ 100 kHz), beneficial for high-frequency applications. EEF-SX0D271XE provides intermediate ESR at 6mOhm with 7.5 A ripple current capacity. Both feature extended lifetime and expanded temperature range. Selection between these variants depends on ripple current requirements and thermal performance needs.

Alternative: EEF-CX0D271XR

EEF-CX0D271XR is an active production part with slightly elevated ESR (12mOhm) and reduced physical height (1.90mm). This variant is suitable when space constraints are critical and the higher ESR is acceptable for the application.

Not Recommended for New Designs: EEF-SX0D271R

EEF-SX0D271R carries "Not For New Designs" status and should be avoided for new product development, despite technical compatibility.

Frequently Asked Questions (FAQ)

Q: Can EEF-UD0D271LR be directly replaced with any of these substitute parts?

A: Yes. All listed substitute parts share identical capacitance (270 µF), voltage rating (2 V), tolerance (±20%), package (2917 / 7343 Metric), and mounting type (Surface Mount). Direct PCB-level substitution is mechanically and electrically valid.

Q: What is the primary difference between EEF-SX0D271ER and the original EEF-UD0D271LR?

A: The primary differences are product status (Active versus Obsolete), lifetime rating (2000 hours versus 1000 hours at 105°C), operating temperature range (-55°C to 105°C versus -40°C to 105°C), and physical height (2.00mm versus 3.00mm). Electrical performance at rated conditions remains equivalent.

Q: Why do substitute parts have different ESR values?

A: ESR variation reflects different internal construction and material formulations within the polymer capacitor family. All listed ESR values (4.5mOhm to 12mOhm) are acceptable for the 270 µF, 2 V category. Selection should be based on application ripple current requirements and thermal dissipation needs.

Q: Are all substitute parts RoHS and REACH compliant?

A: All active production substitute parts (EEF-SX0D271ER, EEF-SX0D271E4, EEF-SX0D271XE, EEF-CX0D271XR) carry ROHS3 compliance and REACH unaffected certification. EEF-SX0D271R does not carry these certifications and is marked "Not For New Designs."

Q: What packaging format should be specified for production orders?

A: The original EEF-UD0D271LR was supplied in bulk packaging. All active substitute parts are supplied in Tape & Reel (TR) format, which is standard for surface mount production. Confirm tape specifications with your supplier if custom reel configurations are required.

Q: Can EEF-CX0D271XR be used if space is extremely limited?

A: Yes. EEF-CX0D271XR has the lowest seated height (1.90mm) among all substitutes. However, verify that the 12mOhm ESR is acceptable for your circuit's ripple current and thermal requirements before selection.

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