EEF-UD0K101R Equivalent & Substitute Parts

Part Overview

The EEF-UD0K101R is a 100 µF, 8 V aluminum-polymer surface mount capacitor manufactured by Panasonic Electronic Components in the 2917 (7343 Metric) package. This component is classified as obsolete, making substitute parts necessary for ongoing production and maintenance applications. The part delivers 18 mOhm ESR with a 1000-hour lifetime rating at 105°C, suitable for general-purpose applications requiring compact form factors and low equivalent series resistance.

Substiute Parts

EEF-UD0K101R

Panasonic Electronic ComponentsIn Stock: 1067EEF-UD0K101R Datasheet

Current PartRFQ

EEF-CX1A101R

Panasonic Electronic ComponentsIn Stock: 17711EEF-CX1A101R Datasheet

DirectRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution of the EEF-UD0K101R is determined by the following critical parameters:

• Capacitance Value: Must remain 100 µF (±20% tolerance maintained)
• Package Footprint: Must be 2917 (7343 Metric) for PCB compatibility
• Voltage Rating: Substitute must equal or exceed 8 V
• Type: Aluminum-polymer construction required
• Mounting: Surface mount configuration mandatory

The EEF-CX1A101R qualifies as a direct substitute based on matching capacitance, package, type, and mounting specifications. The substitute provides higher voltage rating (10 V) and improved thermal characteristics, making it electrically compatible for applications designed around the original 8 V specification.

Parameter Comparison

Engineering Selection Recommendations

The EEF-CX1A101R serves as the qualified substitute for the obsolete EEF-UD0K101R. Selection is based on the following factors:

Electrical Compatibility: Both parts maintain identical 100 µF capacitance and ±20% tolerance. The substitute's 10 V rating exceeds the original 8 V specification, providing margin for applications operating at or below 8 V.

Package Compatibility: Both components use the 2917 (7343 Metric) package with identical footprint dimensions (0.287" L x 0.169" W / 7.30 mm x 4.30 mm), ensuring direct PCB layout compatibility.

Thermal Performance: The EEF-CX1A101R provides extended 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).

Compliance Status: The substitute carries ROHS3 and REACH Unaffected certifications, meeting current regulatory requirements for new production.

Physical Dimensions: The substitute features reduced seated height (0.075" / 1.90 mm versus 0.118" / 3.00 mm), offering improved board-level clearance in space-constrained applications.

Frequently Asked Questions (FAQ)

Q: Can the EEF-CX1A101R directly replace the EEF-UD0K101R on existing PCBs?

A: Yes. Both parts share identical 2917 (7343 Metric) package footprints and surface mount land patterns. No PCB redesign is required.

Q: What is the impact of the higher 10 V rating on the EEF-CX1A101R?

A: The 10 V rating is a superset of the original 8 V specification. Applications designed for 8 V operation remain fully compatible. The higher voltage rating does not affect performance in circuits operating at or below 8 V.

Q: How do the ESR values differ between these parts?

A: The EEF-UD0K101R specifies 18 mOhm ESR, while the EEF-CX1A101R specifies 40 mOhm ESR. For applications sensitive to ESR characteristics, this difference must be evaluated against circuit requirements. The substitute's higher ESR may impact ripple current handling and thermal performance in high-frequency switching applications.

Q: Are there packaging differences between these parts?

A: Both parts are available in surface mount configuration. The EEF-UD0K101R is supplied in standard packaging, while the EEF-CX1A101R is available in Tape & Reel (TR) format, typical for high-volume production environments.

Q: What is the significance of the product status difference?

A: The EEF-UD0K101R is marked obsolete, indicating end-of-life status. The EEF-CX1A101R is marked "Not For New Designs," indicating limited availability but continued support for existing applications. For new production, alternative current-generation parts should be evaluated.