ASPI-0840-121M Equivalent & Substitute Parts

Part Overview

The ASPI-0840-121M is a 120 µH shielded drum core, wirewound inductor manufactured by Abracon LLC, rated for 900 mA continuous current with 350 mOhm DC resistance. This surface mount component features ferrite core construction and is designed for applications requiring fixed inductance in compact form factors.

The ASPI-0840-121M has reached obsolete product status. Identifying equivalent substitute parts is necessary to maintain design continuity, ensure supply chain availability, and support ongoing production requirements for systems utilizing this inductor specification.

Substiute Parts

ASPI-0840-121M

Abracon LLCIn Stock: 1203ASPI-0840-121M Datasheet

Current PartRFQ

ASPI-8040S-121M-T

Abracon LLCIn Stock: 1603ASPI-8040S-121M-T Datasheet

SimilarRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution of the ASPI-0840-121M is determined by strict equivalence across the following critical parameters:

Electrical Equivalence Criteria:

• Inductance value: 120 µH (fixed specification)
• Inductance tolerance: ±20% (matching tolerance band)
• Core material: Ferrite (shielded drum core construction)
• Shielding: Shielded configuration required
• Current rating: Minimum 900 mA continuous
• Saturation current: Minimum 950 mA

Mechanical Equivalence Criteria:

• Mounting type: Surface mount only
• Physical footprint: 8.00 mm × 8.00 mm base dimensions
• Height: 4.20 mm maximum seated height
• Package type: Nonstandard form factor

Compliance Criteria:

• RoHS3 compliance required
• REACH unaffected status

The ASPI-8040S-121M-T meets all electrical and mechanical equivalence requirements while offering improved performance characteristics and active product status.

Parameter Comparison

Engineering Selection Recommendations

The ASPI-8040S-121M-T is a direct functional substitute for the obsolete ASPI-0840-121M. Selection of this substitute part is supported by the following engineering factors:

Electrical Performance: The substitute part maintains identical inductance (120 µH) and tolerance (±20%) specifications. Current rating and saturation current both exceed the original part requirements, providing design margin. DC resistance is reduced from 350 mOhm to 334 mOhm, resulting in lower power dissipation and improved efficiency.

Mechanical Compatibility: Physical dimensions are identical across all axes (8.00 × 8.00 × 4.20 mm), ensuring direct footprint compatibility on existing printed circuit boards. Surface mount mounting type is preserved.

Compliance and Regulatory Status: Both parts maintain ROHS3 compliance and REACH unaffected status. The substitute part carries active product status with current manufacturing support, eliminating supply chain risk associated with obsolete components.

Operating Environment: The substitute part extends the operating temperature range from −40 to +85°C to −40 to +125°C, providing enhanced thermal performance margin for applications subject to elevated ambient conditions.

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

Frequently Asked Questions (FAQ)

Q: Can the ASPI-8040S-121M-T be used as a direct replacement for the ASPI-0840-121M in existing designs?

A: Yes. The substitute part maintains identical inductance value, tolerance, core material, shielding configuration, and physical dimensions. Electrical performance meets or exceeds all original specifications. Direct substitution on the printed circuit board is supported without design modification.

Q: What are the key differences between these two parts?

A: The primary differences are product status (obsolete versus active), current rating (900 mA versus 950 mA), saturation current (950 mA versus 1.05 A), DC resistance (350 mOhm versus 334 mOhm), operating temperature range (−40 to +85°C versus −40 to +125°C), and packaging format (bulk versus Tape & Reel). All differences favor the substitute part.

Q: Does the lower DC resistance of the substitute part affect circuit operation?

A: The reduction in DC resistance from 350 mOhm to 334 mOhm is a performance improvement. Lower resistance reduces power dissipation and heat generation. This change is transparent to circuit operation and does not require design adjustment.

Q: Is the Tape & Reel packaging compatible with my assembly process?

A: Tape & Reel (TR) packaging is the standard format for automated surface mount assembly. If your manufacturing process uses automated pick-and-place equipment, this packaging format is directly compatible. If manual assembly or bulk component handling is required, packaging format conversion may be necessary.

Q: Are both parts RoHS compliant?

A: Yes. Both the ASPI-0840-121M and ASPI-8040S-121M-T are ROHS3 compliant and REACH unaffected, meeting current regulatory requirements for electronic component manufacturing and use.

Q: What is the self-resonant frequency specification, and why is it specified only for the substitute part?

A: Self-resonant frequency (3.5 MHz for the substitute) is the frequency at which the inductor's parasitic capacitance causes the impedance to transition from inductive to capacitive behavior. This parameter is relevant for high-frequency applications. The original part does not specify this value; the substitute provides this additional technical data for design verification in frequency-dependent applications.

Q: Can I use the substitute part in applications requiring the original −40 to +85°C temperature range?

A: Yes. The substitute part's extended operating range (−40 to +125°C) fully encompasses the original specification range. The part operates within all original temperature requirements with additional margin for higher temperature environments.