EEF-UD0D391LR Equivalent & Substitute Parts

Part Overview

The EEF-UD0D391LR is a 390 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 an ESR of 9mOhm. The product is currently obsolete, making equivalent substitutes necessary for ongoing production and maintenance applications requiring this capacitance and voltage rating.

Key Parameters

Parameter	Value
Capacitance	390 µF
Voltage Rating	2 V
Tolerance	±20%
Package / Case	2917 (7343 Metric)
Mounting Type	Surface Mount
Type	Aluminum Polymer
Operating Temperature Range	-40°C ~ 105°C
ESR (Equivalent Series Resistance)	9mOhm
Lifetime @ Temperature	1000 Hrs @ 105°C

Substitute Part Grouping Explanation

Substitution for the EEF-UD0D391LR is determined by strict equivalence in the following parameters: capacitance (390 µF), voltage rating (2 V), tolerance (±20%), package type (2917 / 7343 Metric), and mounting configuration (Surface Mount). All substitute parts maintain identical physical dimensions (0.287" L x 0.169" W / 7.30mm x 4.30mm) and land pattern compatibility.

The substitute parts differ in ESR characteristics, thermal lifetime ratings, and operating temperature ranges. These variations allow selection based on specific application requirements while maintaining full electrical and mechanical compatibility with the original design.

Parameter Comparison

Parameter	EEF-UD0D391LR	EEF-CX0D391R	EEF-SX0D391E4	EEF-SX0D391ER	EEF-SX0D391XE
Capacitance	390 µF	390 µF	390 µF	390 µF	390 µF
Voltage Rating	2 V	2 V	2 V	2 V	2 V
Tolerance	±20%	±20%	±20%	±20%	±20%
Package / Case	2917 (7343 Metric)	2917 (7343 Metric)	2917 (7343 Metric)	2917 (7343 Metric)	2917 (7343 Metric)
Mounting Type	Surface Mount	Surface Mount	Surface Mount	Surface Mount	Surface Mount
Type	Aluminum Polymer	Aluminum Polymer	Aluminum Polymer	Aluminum Polymer	Aluminum Polymer
ESR (Equivalent Series Resistance)	9mOhm	15mOhm	4.5mOhm	9mOhm	6mOhm
Lifetime @ Temperature	1000 Hrs @ 105°C	2000 Hrs @ 105°C	2000 Hrs @ 105°C	2000 Hrs @ 105°C	2000 Hrs @ 105°C
Operating Temperature Range	-40°C ~ 105°C	-55°C ~ 105°C	-55°C ~ 105°C	-55°C ~ 105°C	-55°C ~ 105°C
Product Status	Obsolete	Active	Active	Active	Active
Height - Seated (Max)	0.118" (3.00mm)	0.075" (1.90mm)	0.079" (2.00mm)	0.079" (2.00mm)	0.079" (2.00mm)
Ripple Current @ 100 kHz	Not specified	5.1 A	8.5 A	6.3 A	7.5 A
RoHS Status	Not specified	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant

Engineering Selection Recommendations

All substitute parts are active products from Panasonic Electronic Components and maintain full electrical and mechanical compatibility with the EEF-UD0D391LR. The substitute options provide extended thermal lifetime (2000 hours at 105°C versus 1000 hours) and expanded operating temperature range (-55°C to 105°C versus -40°C to 105°C).

EEF-SX0D391E4 offers the lowest ESR at 4.5mOhm with the highest ripple current capability (8.5 A @ 100 kHz) and is ROHS3 compliant. EEF-SX0D391ER matches the original ESR specification at 9mOhm while providing improved thermal performance and compliance certifications. EEF-SX0D391XE provides a mid-range ESR option at 6mOhm with 7.5 A ripple current capability. EEF-CX0D391R offers the highest ESR at 15mOhm with the lowest profile height (1.90mm) and is suitable for space-constrained applications.

Frequently Asked Questions (FAQ)

Q: Can EEF-SX0D391E4, EEF-SX0D391ER, EEF-SX0D391XE, and EEF-CX0D391R be used interchangeably with EEF-UD0D391LR?

A: Yes. All substitute parts share identical capacitance (390 µF), voltage rating (2 V), tolerance (±20%), package type (2917 / 7343 Metric), and mounting configuration. Physical dimensions and land patterns are compatible. Selection should be based on ESR requirements, thermal lifetime needs, and operating temperature range specifications for the target application.

Q: What is the primary difference between the substitute options?

A: The substitute parts differ in ESR values (4.5mOhm to 15mOhm), thermal lifetime ratings (all 2000 hours at 105°C), operating temperature ranges (all -55°C to 105°C), and component height. EEF-SX0D391E4 provides the lowest ESR and highest ripple current. EEF-CX0D391R provides the lowest profile height.

Q: Are all substitute parts RoHS and REACH compliant?

A: All substitute parts are ROHS3 compliant and REACH unaffected. The original EEF-UD0D391LR compliance status was not specified in the product data.

Q: Does the reduced height of EEF-CX0D391R affect compatibility?

A: No. The reduced seated height (1.90mm versus 3.00mm for the original) does not affect electrical compatibility or land pattern alignment. Height reduction may provide benefits in space-constrained designs.

Q: Which substitute part most closely matches the original EEF-UD0D391LR specifications?

A: EEF-SX0D391ER matches the original ESR specification at 9mOhm while providing extended thermal lifetime (2000 hours at 105°C) and expanded operating temperature range (-55°C to 105°C).

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