Z0603C241ASMST Ferrite Bead 240 OHM 0603 Equivalent & Substitute Parts

Part Overview

The Z0603C241ASMST is a single-line ferrite bead manufactured by KEMET, rated at 240 Ohms impedance at 100 MHz in a 0603 (1608 Metric) surface mount package. This component is designed for signal line filtering applications with a maximum current rating of 400mA and operates across the temperature range of -55°C to 125°C. The part is currently listed as obsolete, making identification of equivalent and substitute components necessary for ongoing design support and procurement.

Key Parameters

Parameter	Value
Manufacturer Part Number	Z0603C241ASMST
Manufacturer	KEMET
Series	Z-SMS
Product Status	Obsolete
Filter Type	Signal Line
Number of Lines	1
Impedance @ Frequency	240 Ohms @ 100 MHz
Current Rating (Max)	400mA
DC Resistance (DCR) (Max)	250mOhm
Operating Temperature	-55°C ~ 125°C
Package / Case	0603 (1608 Metric)
Mounting Type	Surface Mount
Height (Max)	0.037" (0.95mm)
Size / Dimension	0.063" L x 0.031" W (1.60mm x 0.80mm)
RoHS Status	ROHS3 Compliant
Moisture Sensitivity Level (MSL)	1 (Unlimited)
REACH Status	REACH Unaffected

Substitute Part Grouping Explanation

Substitution of the Z0603C241ASMST ferrite bead is determined by the following critical parameters:

Primary Substitution Criteria:

Package / Case: 0603 (1608 Metric) surface mount form factor
Number of Lines: Single signal line configuration
Operating Temperature Range: -55°C to 125°C
Mounting Type: Surface Mount
RoHS3 Compliance and REACH Unaffected status

Secondary Compatibility Parameters:

Impedance @ 100 MHz: 240 Ohms (exact match preferred; 200-220 Ohms acceptable with application verification)
Current Rating: Minimum 400mA required
DC Resistance: Maximum 250mOhm preferred
Moisture Sensitivity Level: MSL 1 (Unlimited)

Substitute parts are grouped into three impedance categories: 200 Ohms, 220 Ohms, and 240 Ohms at 100 MHz. The 240 Ohm category provides direct impedance equivalence. The 220 Ohm and 200 Ohm categories are listed as parametric equivalents where impedance tolerance and application requirements permit their use.

Parameter Comparison

Manufacturer Part Number	Manufacturer	Impedance @ 100 MHz	Current Rating (Max)	DC Resistance (Max)	Package / Case	Product Status	RoHS Status
Z0603C241ASMST	KEMET	240 Ohms	400mA	250mOhm	0603 (1608 Metric)	Obsolete	ROHS3 Compliant
BMC1JY0240AN	TE Connectivity Passive Product	240 Ohms	500mA	170mOhm	0603 (1608 Metric)	Active	ROHS3 Compliant
FB160808T-241Y-S	Cal-Chip Electronics, Inc.	240 Ohms	400mA	200mOhm	0603 (1608 Metric)	Active	RoHS Compliant
BMC1JY0220AN	TE Connectivity Passive Product	220 Ohms	400mA	200mOhm	0603 (1608 Metric)	Active	ROHS3 Compliant
FB160808T-221Y-S	Cal-Chip Electronics, Inc.	220 Ohms	400mA	200mOhm	0603 (1608 Metric)	Active	RoHS Compliant
742863122	Würth Elektronik	220 Ohms	600mA	250mOhm	0603 (1608 Metric)	Active	ROHS3 Compliant
BLM18AG221SN1D	Murata Electronics	220 Ohms	500mA	250mOhm	0603 (1608 Metric)	Active	ROHS3 Compliant
BBGK00160808221Y00	Pulse Electronics	220 Ohms	550mA	180mOhm	0603 (1608 Metric)	Active	ROHS3 Compliant
BMC1JY0200AN	TE Connectivity Passive Product	200 Ohms	400mA	200mOhm	0603 (1608 Metric)	Active	ROHS3 Compliant
FB160808T-201Y-S	Cal-Chip Electronics, Inc.	200 Ohms	400mA	200mOhm	0603 (1608 Metric)	Active	RoHS Compliant
BBGK00160808201Y00	Pulse Electronics	200 Ohms	400mA	180mOhm	0603 (1608 Metric)	Active	ROHS3 Compliant

Engineering Selection Recommendations

Direct Impedance Match (240 Ohms @ 100 MHz):

The BMC1JY0240AN (TE Connectivity Passive Product) and FB160808T-241Y-S (Cal-Chip Electronics, Inc.) provide exact impedance equivalence to the Z0603C241ASMST. Both parts are in active production status, ensuring long-term availability. The BMC1JY0240AN offers superior current handling at 500mA and lower DC resistance at 170mOhm, while the FB160808T-241Y-S maintains the original 400mA current rating with 200mOhm DC resistance. Both are ROHS3 compliant and operate across the required -55°C to 125°C temperature range.

Parametric Equivalents (220 Ohms @ 100 MHz):

The 220 Ohm ferrite beads (BMC1JY0220AN, FB160808T-221Y-S, 742863122, BLM18AG221SN1D, and BBGK00160808221Y00) represent a 8.3% reduction in impedance from the original 240 Ohm specification. These parts are suitable for applications where impedance tolerance permits this variation. All listed 220 Ohm alternatives are in active production with ROHS3 compliance. The Würth Elektronik 742863122 and Pulse Electronics BBGK00160808221Y00 offer enhanced current ratings of 600mA and 550mA respectively.

Parametric Equivalents (200 Ohms @ 100 MHz):

The 200 Ohm ferrite beads (BMC1JY0200AN, FB160808T-201Y-S, and BBGK00160808201Y00) represent a 16.7% reduction in impedance. These parts are listed as parametric equivalents where application filtering requirements accommodate lower impedance values. All three alternatives are in active production with ROHS3 compliance and maintain the 400mA current rating.

All substitute parts maintain the 0603 (1608 Metric) package form factor, single-line signal configuration, MSL 1 rating, and operating temperature range of the original component.

Frequently Asked Questions (FAQ)

Q: Can I use a 220 Ohm ferrite bead as a direct replacement for the 240 Ohm Z0603C241ASMST?

A: The 220 Ohm ferrite beads are parametric equivalents with an 8.3% impedance reduction. Substitution is determined by application-specific filtering requirements and impedance tolerance specifications. The 0603 package, single-line configuration, current rating, and temperature range are compatible.

Q: What is the difference between the BMC1JY0240AN and FB160808T-241Y-S as 240 Ohm substitutes?

A: Both parts provide 240 Ohms impedance at 100 MHz in the 0603 package. The BMC1JY0240AN offers 500mA current rating and 170mOhm DC resistance, while the FB160808T-241Y-S maintains 400mA current rating with 200mOhm DC resistance. Selection depends on thermal and current margin requirements in the application.

Q: Are all substitute parts RoHS compliant?

A: All listed substitute parts are RoHS compliant. The KEMET Z0603C241ASMST and most substitutes are ROHS3 compliant. The Cal-Chip Electronics FB series parts are RoHS compliant. All parts are REACH Unaffected.

Q: Does the packaging format affect substitution compatibility?

A: All substitute parts are supplied in 0603 (1608 Metric) surface mount packages with identical mounting type and height specifications (0.037" maximum). Packaging formats vary between manufacturers (Tape & Reel or Cut Tape), but this does not affect electrical or mechanical compatibility on the PCB.

Q: What is the Moisture Sensitivity Level (MSL) for substitute parts?

A: All substitute parts listed maintain MSL 1 (Unlimited), matching the original Z0603C241ASMST specification. This indicates no moisture sensitivity restrictions for storage or handling.

Q: Can I substitute a 200 Ohm ferrite bead for the 240 Ohm original part?

A: The 200 Ohm ferrite beads represent a 16.7% impedance reduction and are listed as parametric equivalents. Substitution is determined by application filtering characteristics and impedance tolerance specifications. The 0603 package, single-line configuration, current rating, and temperature range are compatible.

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 Z0603C241ASMST specification.

Q: Why is the Z0603C241ASMST listed as obsolete?

A: The KEMET Z0603C241ASMST is no longer in active production. Multiple active alternatives from TE Connectivity, Cal-Chip Electronics, Würth Elektronik, Murata Electronics, and Pulse Electronics provide equivalent or parametric equivalent functionality in the same 0603 package form factor.

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