ASPI-0840-3R9N Equivalent & Substitute Parts

Part Overview

The ASPI-0840-3R9N is a 3.9 µH shielded drum core wirewound inductor manufactured by Abracon LLC, rated for 5 A continuous current with 15 mOhm DC resistance. This component is designed for surface mount applications in compact 8.00mm x 8.00mm form factors with a maximum seated height of 4.20mm.

The ASPI-0840-3R9N is classified as obsolete. Identification of equivalent and substitute parts is necessary to maintain design continuity, ensure supply chain availability, and support ongoing production requirements for applications utilizing this inductor specification.

Substiute Parts

ASPI-0840-3R9N

Abracon LLCIn Stock: 1043ASPI-0840-3R9N Datasheet

Current PartRFQ

ASPI-8040S-3R9N-T

Abracon LLCIn Stock: 1165ASPI-8040S-3R9N-T Datasheet

SimilarRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution of the obsolete ASPI-0840-3R9N is based on the following critical parameters that must remain consistent or compatible:

Primary Matching Criteria:

• Inductance value: 3.9 µH (exact match required)
• Core material and shielding: Ferrite drum core, shielded configuration
• Mounting type: Surface mount
• Physical footprint: 8.00mm x 8.00mm x 4.20mm maximum height
• Tolerance: ±30%
• Test frequency: 100 kHz

Secondary Compatibility Criteria:

• Current rating: Equal to or greater than 5 A
• DC resistance: Within acceptable operating parameters
• Operating temperature range: Minimum -40°C ~ 85°C coverage
• Compliance certifications: ROHS3 and REACH status

The ASPI-8040S-3R9N-T meets these substitution criteria as an active product from the same manufacturer with identical inductance, core type, shielding, mounting configuration, and physical dimensions.

Parameter Comparison

Engineering Selection Recommendations

The ASPI-8040S-3R9N-T is the designated substitute for the obsolete ASPI-0840-3R9N based on the following engineering factors:

Product Status and Availability: The ASPI-8040S-3R9N-T maintains active product status with confirmed inventory availability, ensuring reliable supply chain access for ongoing production and design implementations.

Electrical Compatibility: Both parts share identical inductance values (3.9 µH) and tolerance specifications (±30%), with testing performed at the same frequency (100 kHz). The substitute part maintains saturation current performance (5.75 A) that exceeds the original specification (5.6 A). The DC resistance increase from 15 mOhm to 17 mOhm represents a 2 mOhm differential within acceptable operating parameters for this component category.

Physical and Mechanical Compatibility: The substitute part maintains identical physical dimensions (8.00mm x 8.00mm x 4.20mm maximum height) and mounting configuration, ensuring direct compatibility with existing PCB layouts and assembly processes.

Compliance and Certification: Both parts maintain ROHS3 compliance and REACH unaffected status, meeting regulatory requirements for electronic component applications. The substitute part operates across an extended temperature range (-40°C ~ 125°C) compared to the original specification (-40°C ~ 85°C), providing enhanced thermal performance margin.

Packaging Consideration: The substitute part is supplied in Tape & Reel (TR) packaging, which is standard for automated assembly processes and differs from the original bulk packaging format. This packaging change does not affect electrical or mechanical performance.

Frequently Asked Questions (FAQ)

Q: Can the ASPI-8040S-3R9N-T directly replace the ASPI-0840-3R9N in existing designs?

A: Yes. Both parts share identical inductance (3.9 µH), core type (ferrite drum core, shielded), tolerance (±30%), physical dimensions (8.00mm x 8.00mm x 4.20mm), and mounting configuration (surface mount). The substitute part is electrically and mechanically compatible with designs specified for the original component.

Q: What is the difference in current rating between these parts?

A: The ASPI-0840-3R9N is rated for 5 A continuous current, while the ASPI-8040S-3R9N-T is rated for 4.35 A. Applications requiring the full 5 A rating must evaluate whether the substitute part's 4.35 A rating meets circuit requirements. The saturation current of the substitute part (5.75 A) exceeds the original specification (5.6 A).

Q: How does the DC resistance difference affect circuit performance?

A: The DC resistance increases from 15 mOhm to 17 mOhm, a 2 mOhm differential. This represents a 13.3% increase in resistance. Circuit designs must evaluate whether this resistance increase impacts power dissipation, voltage drop, or thermal performance in the specific application.

Q: Are there packaging differences between these parts?

A: Yes. The ASPI-0840-3R9N is supplied in bulk packaging, while the ASPI-8040S-3R9N-T is supplied in Tape & Reel (TR) format. Tape & Reel packaging is standard for automated assembly processes and does not affect electrical or mechanical performance.

Q: What is the operating temperature range difference?

A: The ASPI-0840-3R9N operates from -40°C to 85°C, while the ASPI-8040S-3R9N-T operates from -40°C to 125°C. The substitute part provides an extended upper temperature limit of 40°C, offering enhanced thermal performance margin for applications operating at elevated temperatures.

Q: Are both parts RoHS and REACH compliant?

A: Yes. Both the ASPI-0840-3R9N and ASPI-8040S-3R9N-T are ROHS3 compliant and REACH unaffected, meeting regulatory requirements for electronic component applications.

Q: What is the self-resonant frequency of the substitute part?

A: The ASPI-8040S-3R9N-T has a self-resonant frequency of 26 MHz. This specification was not provided for the original ASPI-0840-3R9N. The self-resonant frequency defines the frequency at which the inductor transitions from inductive to capacitive behavior due to parasitic capacitance.