Z0805C241ASMST Ferrite Bead Equivalent & Substitute Parts

Part Overview

The Z0805C241ASMST is a 240 Ohm ferrite bead manufactured by KEMET, designed for single-line signal filtering in 0805 (2012 Metric) surface mount applications. This component operates at 100 MHz impedance with a maximum current rating of 600mA and DC resistance of 200mOhm. The part is classified as obsolete, necessitating identification of equivalent and substitute components for ongoing design requirements and procurement needs.

Substiute Parts

Z0805C241ASMST

KEMETIn Stock: 3744Z0805C241ASMST Datasheet

Current PartRFQ

Z0805C241BSMST

KEMETIn Stock: 4569Z0805C241BSMST Datasheet

Parametric EquivalentRFQ

ACML-0805-221-T

Abracon LLCIn Stock: 5183ACML-0805-221-T Datasheet

Parametric EquivalentRFQ

BBGK00201209221Y00

Pulse ElectronicsIn Stock: 773BBGK00201209221Y00 Datasheet

Parametric EquivalentRFQ

BLM21AG221SN1D

Murata ElectronicsIn Stock: 5144BLM21AG221SN1D Datasheet

Parametric EquivalentRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution of the Z0805C241ASMST ferrite bead is determined by the following critical parameters:

Mechanical Compatibility:

• Package type: 0805 (2012 Metric) surface mount
• Physical dimensions: 0.079" L x 0.049" W (2.00mm x 1.25mm)
• Height maximum: 0.041" (1.05mm)

Electrical Compatibility:

• Impedance at 100 MHz: 240 Ohms (primary specification) or 220 Ohms (acceptable variance for signal line filtering)
• Current rating: minimum 600mA
• DC resistance: maximum 200mOhm
• Single signal line configuration

Environmental & Compliance:

• Operating temperature range: -55°C ~ 125°C
• RoHS3 compliance required
• MSL rating: 1 (Unlimited)

Substitute parts are grouped into two categories: parametric equivalents with identical 240 Ohm impedance specifications, and functional equivalents with 220 Ohm impedance that maintain electrical performance within acceptable tolerances for signal line applications.

Parameter Comparison

Engineering Selection Recommendations

Parametric Equivalent (Identical Specifications):

Z0805C241BSMST (KEMET) is a parametric equivalent with identical electrical and mechanical specifications to the Z0805C241ASMST. Both components share the same 240 Ohm impedance at 100 MHz, 600mA current rating, and 200mOhm DC resistance. However, both parts carry obsolete product status. This option is suitable only when exact specification matching is required and inventory availability permits.

Functional Equivalents (Active Product Status):

ACML-0805-221-T (Abracon LLC), BBGK00201209221Y00 (Pulse Electronics), and BLM21AG221SN1D (Murata Electronics) are active production ferrite beads with 220 Ohm impedance at 100 MHz. These components maintain the same package footprint, operating temperature range, and compliance certifications as the original part.

ACML-0805-221-T provides direct electrical compatibility with matching 600mA current rating and 200mOhm DC resistance specifications.

BBGK00201209221Y00 and BLM21AG221SN1D offer enhanced performance characteristics with higher current ratings (750mA and 800mA respectively) and lower DC resistance values (180mOhm and 130mOhm respectively), providing design margin for applications requiring improved thermal performance or higher current handling.

All substitute parts are ROHS3 compliant, MSL 1 rated, and suitable for the -55°C to 125°C operating temperature range. Selection between active alternatives should prioritize current product status and long-term supply chain availability.

Frequently Asked Questions (FAQ)

Q: Can Z0805C241BSMST be used as a direct replacement for Z0805C241ASMST?

A: Yes. Z0805C241BSMST is a parametric equivalent with identical impedance (240 Ohms @ 100 MHz), current rating (600mA), DC resistance (200mOhm), and package specifications. Both parts are obsolete; selection depends on inventory availability.

Q: Why are 220 Ohm ferrite beads listed as substitutes for a 240 Ohm specification?

A: The 220 Ohm impedance variants (ACML-0805-221-T, BBGK00201209221Y00, BLM21AG221SN1D) represent an 8.3% impedance variance from the original 240 Ohm specification. This variance is acceptable for signal line ferrite bead applications where impedance tolerance typically ranges ±20%. These parts maintain functional compatibility while offering active product status and improved availability.

Q: What is the difference between Cut Tape (CT) and Tape & Reel (TR) packaging?

A: Cut Tape packaging supplies individual components on tape segments suitable for manual handling and small-quantity applications. Tape & Reel packaging provides continuous reel format optimized for automated assembly equipment and high-volume production. Both packaging formats contain identical components; selection depends on assembly process requirements.

Q: Are all substitute parts RoHS3 compliant?

A: Yes. All listed substitute parts (Z0805C241BSMST, ACML-0805-221-T, BBGK00201209221Y00, BLM21AG221SN1D) are ROHS3 compliant with MSL 1 (Unlimited) moisture sensitivity rating, matching the compliance profile of the original Z0805C241ASMST component.

Q: Which substitute offers the best thermal performance?

A: BLM21AG221SN1D (Murata Electronics) provides the lowest DC resistance at 130mOhm maximum, compared to 200mOhm for the original specification and 180mOhm for BBGK00201209221Y00. Lower DC resistance reduces heat generation in high-current applications. BLM21AG221SN1D also supports the highest current rating at 800mA.

Q: Can these ferrite beads be used interchangeably in existing designs?

A: Mechanical and thermal interchangeability is confirmed for all listed parts within the 0805 (2012 Metric) package. Electrical interchangeability depends on circuit impedance tolerance specifications. The 220 Ohm variants require circuit validation to confirm acceptable performance within the 8.3% impedance variance from the original 240 Ohm specification.

Q: What is the operating temperature range for all substitute parts?

A: All substitute parts operate across the -55°C to 125°C temperature range, matching the original Z0805C241ASMST specification.