Z0603C181CSMST Ferrite Bead 180 OHM 0603 Equivalent & Substitute Parts

Part Overview

The Z0603C181CSMST is a single-line signal ferrite bead manufactured by KEMET in the 0603 (1608 Metric) surface mount package. This component provides 180 Ohms of impedance at 100 MHz with a maximum current rating of 250 mA and 650 mOhm DC resistance. The part operates across the temperature range of -55°C to 125°C and is RoHS3 compliant with MSL 1 (Unlimited) moisture sensitivity rating.

The Z0603C181CSMST is classified as obsolete. Identifying equivalent and substitute ferrite beads is necessary to maintain design continuity, ensure supply chain availability, and support ongoing production requirements. Substitute parts must maintain electrical performance within the application's tolerance while meeting the same environmental and compliance standards.

Key Parameters

Parameter	Value
Impedance @ Frequency	180 Ohms @ 100 MHz
Filter Type	Signal Line
Number of Lines	1
Current Rating (Max)	250 mA
DC Resistance (Max)	650 mOhm
Package / Case	0603 (1608 Metric)
Mounting Type	Surface Mount
Operating Temperature	-55°C ~ 125°C
RoHS Status	RoHS3 Compliant
Moisture Sensitivity Level	1 (Unlimited)

Substitute Part Grouping Explanation

Ferrite bead substitution is determined by the following critical parameters:

Primary Matching Criteria:

Impedance value at 100 MHz (180 Ohms for direct equivalents)
Package type (0603 / 1608 Metric)
Filter type (Signal Line, single line)
Operating temperature range (-55°C ~ 125°C)
Compliance certifications (RoHS3, REACH Unaffected)

Secondary Compatibility Factors:

Current rating must equal or exceed 250 mA
DC resistance must be acceptable for the application
Mounting type (Surface Mount)
Physical dimensions within 0603 specification

Substitute parts are grouped into two categories:

Category 1: Direct Electrical Equivalents (180 Ohms @ 100 MHz) Parts with identical impedance specification that directly replace the Z0603C181CSMST without circuit redesign.

Category 2: Near-Equivalent Alternatives (150-200 Ohms @ 100 MHz) Parts with impedance values within ±20 Ohms of the original specification. These parts are suitable for applications where impedance tolerance permits deviation from the nominal 180 Ohm value.

Parameter Comparison

Manufacturer Part Number	Manufacturer	Impedance @ 100 MHz	Current Rating (Max)	DC Resistance (Max)	Package	Product Status	RoHS Status
Z0603C181CSMST	KEMET	180 Ohms	250 mA	650 mOhm	0603 (1608 Metric)	Obsolete	RoHS3 Compliant
742792622	Würth Elektronik	180 Ohms	500 mA	300 mOhm	0603 (1608 Metric)	Active	RoHS3 Compliant
BBGK00160808181Y00	Pulse Electronics	180 Ohms	400 mA	180 mOhm	0603 (1608 Metric)	Active	RoHS3 Compliant
BMC1JY0180AN	TE Connectivity Passive Product	180 Ohms	400 mA	200 mOhm	0603 (1608 Metric)	Active	RoHS3 Compliant
FB160808T-181Y-S	Cal-Chip Electronics, Inc.	180 Ohms	400 mA	200 mOhm	0603 (1608 Metric)	Active	RoHS Compliant
BBGK00160808201Y00	Pulse Electronics	200 Ohms	400 mA	180 mOhm	0603 (1608 Metric)	Active	RoHS3 Compliant
BMC1JY0200AN	TE Connectivity Passive Product	200 Ohms	400 mA	200 mOhm	0603 (1608 Metric)	Active	RoHS3 Compliant
FB160808T-201Y-S	Cal-Chip Electronics, Inc.	200 Ohms	400 mA	200 mOhm	0603 (1608 Metric)	Active	RoHS Compliant
BLM18BB151SN1D	Murata Electronics	150 Ohms	450 mA	370 mOhm	0603 (1608 Metric)	Active	RoHS3 Compliant
BMC1JY0150AN	TE Connectivity Passive Product	150 Ohms	400 mA	150 mOhm	0603 (1608 Metric)	Active	RoHS3 Compliant
FB160808T-151Y-S	Cal-Chip Electronics, Inc.	150 Ohms	400 mA	150 mOhm	0603 (1608 Metric)	Active	RoHS Compliant

Engineering Selection Recommendations

Direct Replacement (180 Ohms @ 100 MHz):

The following parts provide direct electrical equivalence to the Z0603C181CSMST and are recommended for applications requiring identical impedance specification:

742792622 (Würth Elektronik WE-CBF series): Active product status with enhanced current rating (500 mA) and reduced DC resistance (300 mOhm). RoHS3 compliant. Suitable for designs with higher current requirements.
BBGK00160808181Y00 (Pulse Electronics BBGK series): Active product status with 400 mA current rating and 180 mOhm DC resistance. RoHS3 compliant. Tape & Reel packaging available.
BMC1JY0180AN (TE Connectivity BMC series): Active product status with 400 mA current rating and 200 mOhm DC resistance. RoHS3 compliant. Cut Tape packaging available.
FB160808T-181Y-S (Cal-Chip Electronics FB series): Active product status with 400 mA current rating and 200 mOhm DC resistance. RoHS compliant. Tape & Reel packaging available.

All direct replacement options exceed the original 250 mA current requirement and maintain the -55°C to 125°C operating temperature range. All parts are MSL 1 (Unlimited) rated and REACH Unaffected.

Near-Equivalent Alternatives (150-200 Ohms @ 100 MHz):

The following parts provide impedance values within ±20 Ohms of the original specification and are suitable for applications where impedance tolerance permits deviation:

BBGK00160808201Y00 (Pulse Electronics, 200 Ohms): Active product status, RoHS3 compliant.
BMC1JY0200AN (TE Connectivity, 200 Ohms): Active product status, RoHS3 compliant.
FB160808T-201Y-S (Cal-Chip Electronics, 200 Ohms): Active product status, RoHS compliant.
BLM18BB151SN1D (Murata Electronics EMIFIL® BLM18, 150 Ohms): Active product status, RoHS3 compliant.
BMC1JY0150AN (TE Connectivity, 150 Ohms): Active product status, RoHS3 compliant.
FB160808T-151Y-S (Cal-Chip Electronics, 150 Ohms): Active product status, RoHS compliant.

All substitute parts maintain RoHS3 compliance (or RoHS compliance for Cal-Chip parts), REACH Unaffected status, and MSL 1 (Unlimited) moisture sensitivity rating. All parts are surface mount in the 0603 (1608 Metric) package with operating temperature range of -55°C to 125°C.

Frequently Asked Questions (FAQ)

Q: Can I use a 200 Ohm ferrite bead in place of the 180 Ohm Z0603C181CSMST?

A: A 200 Ohm ferrite bead represents an 11% increase in impedance from the original 180 Ohm specification. Substitution is permissible only if the application circuit design tolerates this impedance deviation. The electrical filtering characteristics will differ proportionally. Verify circuit performance requirements before substitution.

Q: What is the difference between the Würth Elektronik 742792622 and other 180 Ohm alternatives?

A: The Würth Elektronik 742792622 provides the highest current rating (500 mA) and lowest DC resistance (300 mOhm) among the 180 Ohm direct equivalents. This part is suitable for applications requiring higher current handling or lower power dissipation. All other electrical and mechanical parameters remain equivalent to the original part.

Q: Are all substitute parts available in the same packaging format?

A: No. The original Z0603C181CSMST uses unspecified packaging. Substitute parts are available in Tape & Reel (TR) or Cut Tape (CT) formats. Verify packaging compatibility with your assembly process before selection. Tape & Reel packaging is standard for high-volume production; Cut Tape is suitable for lower-volume applications.

Q: Do all substitute parts meet the same compliance standards as the original?

A: All substitute parts listed are RoHS3 compliant (or RoHS compliant for Cal-Chip Electronics parts), REACH Unaffected, and MSL 1 (Unlimited) rated. All parts operate across the -55°C to 125°C temperature range. Compliance certifications are equivalent across all options.

Q: What is the significance of DC resistance differences among substitute parts?

A: DC resistance (DCR) determines power dissipation in the ferrite bead. The original Z0603C181CSMST has 650 mOhm maximum DCR. Substitute parts range from 180 mOhm to 500 mOhm. Lower DCR values result in reduced heat generation and power loss. Higher current applications benefit from lower DCR values. Select based on thermal and power budget requirements.

Q: Can I substitute a 150 Ohm ferrite bead for the 180 Ohm original?

A: A 150 Ohm ferrite bead represents a 17% decrease in impedance from the original 180 Ohm specification. Substitution is permissible only if the application circuit design tolerates this impedance reduction. The electrical filtering characteristics will differ proportionally. Verify circuit performance requirements before substitution.

Q: What is the difference between RoHS and RoHS3 compliance?

A: RoHS3 (Directive 2011/65/EU as amended) is the current regulatory standard and includes restrictions on additional substances beyond RoHS. RoHS (Directive 2002/95/EC) is the earlier standard. RoHS3 compliant parts meet current regulatory requirements. Cal-Chip Electronics parts listed are RoHS compliant; all other manufacturers provide RoHS3 compliant parts.

Q: Are the physical dimensions identical across all substitute parts?

A: All substitute parts conform to the 0603 (1608 Metric) package specification. Maximum height varies slightly: the original part specifies 0.037" (0.95 mm), while the Würth Elektronik part specifies 0.039" (1.00 mm). These variations remain within standard 0603 package tolerances and do not affect PCB assembly compatibility.

Q: Which substitute part offers the best overall performance match to the original?

A: The BBGK00160808181Y00 (Pulse Electronics) and BMC1JY0180AN (TE Connectivity) provide the closest electrical match with identical 180 Ohm impedance, active product status, and RoHS3 compliance. Both parts exceed the original 250 mA current requirement and maintain equivalent operating temperature range. Selection between these options depends on packaging preference (Tape & Reel versus Cut Tape) and supplier availability.

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