Z0805C241CSMST Equivalent & Substitute Parts

Part Overview

The Z0805C241CSMST is a 240 Ohm ferrite bead manufactured by KEMET in the 0805 (2012 Metric) surface mount package. This single-line signal filtering component operates at 100 MHz with a maximum current rating of 300mA and 350mOhm DC resistance. The part is classified as obsolete, necessitating identification of equivalent alternatives for ongoing design support and procurement.

Key Parameters

Parameter	Value
Impedance @ 100 MHz	240 Ohms
Current Rating (Max)	300mA
DC Resistance (Max)	350mOhm
Package / Case	0805 (2012 Metric)
Mounting Type	Surface Mount
Operating Temperature	-55°C ~ 125°C
Filter Type	Signal Line
Number of Lines	1
RoHS Status	ROHS3 Compliant
Moisture Sensitivity Level	1 (Unlimited)

Substitute Part Grouping Explanation

Substitution eligibility is determined by the following criteria applied strictly to the provided parameters:

Primary Equivalence Criteria:

Package / Case: 0805 (2012 Metric)
Mounting Type: Surface Mount
Operating Temperature Range: -55°C ~ 125°C
Filter Type: Signal Line
Number of Lines: 1

Secondary Compatibility Criteria:

Impedance @ 100 MHz: 220–240 Ohms (within 8% tolerance)
Current Rating: Equal to or greater than 300mA
DC Resistance: Equal to or less than 350mOhm

Substitute parts are grouped into two categories:

Category A – Direct KEMET Series Equivalents: Z0805C241ASMST and Z0805C241BSMST maintain identical impedance (240 Ohms @ 100 MHz) and package specifications. Both support higher current ratings (600mA) and lower DC resistance (200mOhm), providing enhanced performance margins within the same product line.

Category B – Cross-Manufacturer Equivalents: Parts from TE Connectivity, Würth Elektronik, Abracon, Pulse Electronics, Murata, and API Delevan meet all primary criteria. Impedance values range from 200–220 Ohms, representing a 8–17% deviation from the original 240 Ohm specification. All maintain compatible current ratings and DC resistance within acceptable limits.

Parameter Comparison

Manufacturer Part Number	Manufacturer	Impedance @ 100 MHz	Current Rating (Max)	DC Resistance (Max)	Package / Case	Height (Max)	Product Status	RoHS Status
Z0805C241CSMST	KEMET	240 Ohms	300mA	350mOhm	0805 (2012 Metric)	0.041" (1.05mm)	Obsolete	ROHS3 Compliant
Z0805C241ASMST	KEMET	240 Ohms	600mA	200mOhm	0805 (2012 Metric)	0.041" (1.05mm)	Obsolete	ROHS3 Compliant
Z0805C241BSMST	KEMET	240 Ohms	600mA	200mOhm	0805 (2012 Metric)	0.041" (1.05mm)	Obsolete	ROHS3 Compliant
2176486-3	TE Connectivity Passive Product	220 Ohms	300mA	250mOhm	0805 (2012 Metric)	0.043" (1.10mm)	Active	Not specified
742792034	Würth Elektronik	220 Ohms	300mA	300mOhm	0805 (2012 Metric)	0.043" (1.10mm)	Active	ROHS3 Compliant
ACML-0805-221-T	Abracon LLC	220 Ohms	600mA	200mOhm	0805 (2012 Metric)	0.041" (1.05mm)	Active	ROHS3 Compliant
BBBK00201209221Y00	Pulse Electronics	220 Ohms	300mA	300mOhm	0805 (2012 Metric)	0.043" (1.10mm)	Active	ROHS3 Compliant
BLM21BB201SN1D	Murata Electronics	200 Ohms	500mA	260mOhm	0805 (2012 Metric)	0.041" (1.05mm)	Active	ROHS3 Compliant
BLM21BB221SN1D	Murata Electronics	220 Ohms	500mA	260mOhm	0805 (2012 Metric)	0.041" (1.05mm)	Active	ROHS3 Compliant
BLM21BD221SN1D	Murata Electronics	220 Ohms	350mA	250mOhm	0805 (2012 Metric)	0.057" (1.45mm)	Active	ROHS3 Compliant
EMI0805R-220	API Delevan Inc.	220 Ohms	500mA	220mOhm	0805 (2012 Metric)	0.043" (1.10mm)	Active	ROHS3 Compliant

Engineering Selection Recommendations

For Direct Replacement (Identical Impedance): Z0805C241ASMST and Z0805C241BSMST are the preferred alternatives, maintaining 240 Ohm impedance specification. Both parts are obsolete but offer superior electrical performance with doubled current capacity and reduced DC resistance. Both are ROHS3 compliant.

For Active Product Status: All cross-manufacturer alternatives listed maintain active product status, ensuring long-term availability and supply chain stability. ACML-0805-221-T, BLM21BB221SN1D, and EMI0805R-220 provide the most favorable electrical characteristics with 220 Ohm impedance, current ratings between 500–600mA, and DC resistance values between 200–260mOhm.

For Compliance Requirements: All substitute parts are ROHS3 compliant with Moisture Sensitivity Level 1 (Unlimited), matching the original part's environmental specifications. REACH status is unaffected for all listed alternatives.

For Height-Constrained Applications: Parts with maximum height of 0.041" (1.05mm) are Z0805C241ASMST, Z0805C241BSMST, ACML-0805-221-T, BLM21BB201SN1D, and BLM21BB221SN1D. BLM21BD221SN1D reaches 0.057" (1.45mm) and may not be suitable for space-limited designs.

Frequently Asked Questions (FAQ)

Q: Can Z0805C241ASMST or Z0805C241BSMST be used as direct replacements? A: Yes. Both maintain the 240 Ohm impedance specification and 0805 package. They provide enhanced performance with higher current ratings (600mA vs. 300mA) and lower DC resistance (200mOhm vs. 350mOhm). Both are ROHS3 compliant.

Q: What is the impedance tolerance for cross-manufacturer substitutes? A: Cross-manufacturer alternatives operate at 200–220 Ohms @ 100 MHz, representing a maximum 17% deviation from the original 240 Ohm specification. This range is within standard ferrite bead tolerance bands for signal line filtering applications.

Q: Are all substitute parts available in the same packaging format? A: All substitute parts use 0805 (2012 Metric) surface mount packages. Packaging format differs between Cut Tape (CT) and Tape & Reel (TR). Height specifications vary between 0.041" and 0.057" maximum; verify clearance for height-constrained PCB layouts.

Q: Which substitute offers the lowest DC resistance? A: ACML-0805-221-T and EMI0805R-220 provide 200mOhm and 220mOhm DC resistance respectively, compared to the original 350mOhm specification.

Q: Are all substitutes RoHS compliant? A: All listed substitute parts are ROHS3 compliant with Moisture Sensitivity Level 1 (Unlimited), matching the original part's environmental certifications.

Q: Which substitute has the highest current rating? A: Z0805C241ASMST, Z0805C241BSMST, and ACML-0805-221-T all support 600mA maximum current, compared to the original 300mA rating.

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