ELJ-PF3N9DFB Equivalent & Substitute Parts

Part Overview

The ELJ-PF3N9DFB is a 3.9 nH unshielded drum core wirewound inductor manufactured by Panasonic Electronic Components. This surface mount component is rated for 1.4 A maximum current with 80 mOhm DC resistance in a 0402 (1005 Metric) package. The part is currently obsolete, making identification of functionally equivalent alternatives essential for ongoing design support and procurement.

Substiute Parts

ELJ-PF3N9DFB

Panasonic Electronic ComponentsIn Stock: 1119ELJ-PF3N9DFB Datasheet

Current PartRFQ

AISC-0402HP-3N9J-T

Abracon LLCIn Stock: 80053AISC-0402HP-3N9J-T Datasheet

SimilarRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution of the ELJ-PF3N9DFB is determined by the following critical parameters:

• Inductance Value: Must be 3.9 nH to maintain circuit performance
• Package / Case: Must be 0402 (1005 Metric) for PCB footprint compatibility
• Mounting Type: Must be Surface Mount for assembly compatibility
• Core Type: Must be Ceramic Drum Core, Wirewound to match electrical characteristics
• Shielding: Must be Unshielded to match the original design
• Current Rating: Must meet or exceed 1.4 A requirement
• DC Resistance: Should be comparable to 80 mOhm Max for circuit performance

The AISC-0402HP-3N9J-T from Abracon LLC meets all critical substitution criteria while offering improved electrical performance characteristics.

Parameter Comparison

Engineering Selection Recommendations

The AISC-0402HP-3N9J-T is a direct functional substitute for the obsolete ELJ-PF3N9DFB. Both components share identical inductance values, package dimensions, and core construction. The Abracon part offers superior electrical performance with lower DC resistance (45 mOhm vs. 80 mOhm) and higher current rating (1.7 A vs. 1.4 A), providing design margin in current-limited applications.

The AISC-0402HP-3N9J-T maintains active product status with ROHS3 compliance and improved moisture sensitivity rating (MSL 1 vs. MSL 2), supporting long-term supply chain reliability. The extended operating temperature range (-40°C ~ 125°C vs. -40°C ~ 85°C) accommodates broader thermal environments.

Frequently Asked Questions (FAQ)

Q: Can the AISC-0402HP-3N9J-T directly replace the ELJ-PF3N9DFB without PCB modifications?

A: Yes. Both components use identical 0402 (1005 Metric) package dimensions and surface mount footprints. No PCB layout changes are required.

Q: What is the impact of the different inductance tolerances (±0.3 nH vs. ±5%)?

A: The ELJ-PF3N9DFB specifies ±0.3 nH absolute tolerance, while the AISC-0402HP-3N9J-T specifies ±5% relative tolerance. At 3.9 nH, the ±5% tolerance equals approximately ±0.195 nH, which is tighter than the original specification. Both meet the same functional requirement.

Q: Does the lower DC resistance of the AISC-0402HP-3N9J-T affect circuit operation?

A: Lower DC resistance (45 mOhm vs. 80 mOhm) reduces resistive losses and heat generation. This is a beneficial characteristic that improves efficiency without requiring circuit redesign.

Q: Is the extended operating temperature range of the AISC-0402HP-3N9J-T compatible with the original design?

A: Yes. The substitute part's extended range (-40°C ~ 125°C) encompasses the original specification (-40°C ~ 85°C). Applications operating within the original temperature limits experience no compatibility issues.

Q: What is the significance of the MSL rating difference?

A: The ELJ-PF3N9DFB has MSL 2 (1 Year shelf life), while the AISC-0402HP-3N9J-T has MSL 1 (Unlimited shelf life). The substitute part offers superior moisture protection and longer storage capability without baking requirements.

Q: Are both parts REACH compliant?

A: Yes. Both the ELJ-PF3N9DFB and AISC-0402HP-3N9J-T are listed as REACH Unaffected, indicating compliance with REACH regulations.