Würth Elektronik 742792043 Ferrite Bead 600 Ohm 0805 Equivalent & Substitute Parts

Part Overview

The Würth Elektronik 742792043 is a single-line ferrite bead designed for signal line filtering in 0805 (2012 Metric) surface mount applications. This component operates at 600 Ohms impedance at 100 MHz with a maximum current rating of 200mA and 650mOhm DC resistance. The part is classified as Obsolete, making equivalent and substitute parts necessary for ongoing design support and procurement.

Key Parameters

Parameter	Value
Impedance @ 100 MHz	600 Ohms
Current Rating (Max)	200mA
DC Resistance (Max)	650mOhm
Package / Case	0805 (2012 Metric)
Number of Lines	1
Operating Temperature Range	-55°C to 125°C
Mounting Type	Surface Mount
RoHS Status	ROHS3 Compliant
Moisture Sensitivity Level	1 (Unlimited)

Substitute Part Grouping Explanation

Substitution for the 742792043 is determined by strict adherence to the following electrical and mechanical parameters:

Critical Parameters (Must Match):

Impedance @ 100 MHz: 600 Ohms
Package / Case: 0805 (2012 Metric)
Number of Lines: 1
Operating Temperature Range: -55°C to 125°C
Mounting Type: Surface Mount

Allowable Variation Parameters:

Current Rating (Max): 200mA or higher
DC Resistance (Max): 650mOhm or lower
RoHS Status: ROHS3 Compliant
Moisture Sensitivity Level: 1 (Unlimited)

Substitute parts are grouped into two categories based on current rating capability: parts rated at 200mA (direct electrical equivalents) and parts rated at 300mA (higher current capability with equivalent impedance and package specifications).

Parameter Comparison

Manufacturer Part Number	Manufacturer	Impedance @ 100 MHz	Current Rating (Max)	DC Resistance (Max)	Package	Product Status	Packaging Type
742792043	Würth Elektronik	600 Ohms	200mA	650mOhm	0805	Obsolete	Cut Tape (CT) & Digi-Reel®
74279204	Würth Elektronik	600 Ohms	200mA	350mOhm	0805	Active	Cut Tape (CT) & Digi-Reel®
742792041	Würth Elektronik	600 Ohms	200mA	400mOhm	0805	Active	Tape & Reel (TR)
742792042	Würth Elektronik	600 Ohms	200mA	500mOhm	0805	Active	Cut Tape (CT) & Digi-Reel®
2176486-5	TE Connectivity Passive Product	600 Ohms	300mA	350mOhm	0805	Active	Cut Tape (CT)
2508056017Y0	Fair-Rite Products Corp.	600 Ohms	300mA	350mOhm	0805	Active	Tape & Reel (TR)
BBBK00201209601Y00	Pulse Electronics	600 Ohms	300mA	400mOhm	0805	Active	Tape & Reel (TR)
BLM21BD601SN1D	Murata Electronics	600 Ohms	300mA	350mOhm	0805	Active	Cut Tape (CT) & Digi-Reel®
BLM21RK601SN1D	Murata Electronics	600 Ohms	200mA	300mOhm	0805	Active	Tape & Reel (TR)
BMB2A0600BN3	TE Connectivity Passive Product	600 Ohms	200mA	600mOhm	0805	Obsolete	Cut Tape (CT)
BMB2A0600RS2	TE Connectivity Passive Product	600 Ohms	200mA	500mOhm	0805	Obsolete	Cut Tape (CT) & Digi-Reel®

Engineering Selection Recommendations

Primary Substitutes (Active Status, Würth Elektronik Series):

The 74279204, 742792041, and 742792042 are direct electrical equivalents from Würth Elektronik's active WE-CBF series. All three maintain the 600 Ohms @ 100 MHz impedance and 200mA current rating. Selection among these three depends on DC resistance tolerance requirements and packaging preference. The 74279204 offers the lowest DC resistance at 350mOhm with Cut Tape packaging. The 742792041 provides 400mOhm DC resistance in Tape & Reel format. The 742792042 delivers 500mOhm DC resistance in Cut Tape & Digi-Reel® packaging with the highest inventory availability.

Secondary Substitutes (Active Status, Higher Current Rating):

The 2176486-5 (TE Connectivity), 2508056017Y0 (Fair-Rite), BBBK00201209601Y00 (Pulse Electronics), and BLM21BD601SN1D (Murata) all provide 300mA current rating capability while maintaining 600 Ohms impedance and 0805 package specifications. These parts are suitable for applications requiring higher current headroom. The BLM21RK601SN1D from Murata offers the lowest DC resistance at 300mOhm with 200mA current rating and active product status.

Compliance Considerations:

All recommended substitute parts maintain ROHS3 compliance and Moisture Sensitivity Level 1 (Unlimited) ratings consistent with the original 742792043 specification. Parts with Obsolete status (BMB2A0600BN3 and BMB2A0600RS2) should be avoided for new designs despite meeting electrical parameters.

Frequently Asked Questions (FAQ)

Q: Can I use a substitute part with higher current rating than the original 742792043?

A: Yes. Parts rated at 300mA are direct substitutes for the 200mA-rated 742792043 in applications where the original 200mA rating is sufficient. Higher current rating provides additional design margin without affecting impedance or package compatibility.

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

A: DC resistance affects signal insertion loss and thermal performance. Lower DC resistance (300mOhm to 400mOhm) reduces power dissipation compared to the original 650mOhm specification. Selection should be based on thermal budget and signal integrity requirements of the specific application.

Q: Are packaging format differences between Cut Tape and Tape & Reel significant for substitution?

A: Packaging format affects procurement and assembly processes but does not impact electrical or mechanical compatibility. Cut Tape (CT) & Digi-Reel® packaging suits lower-volume applications, while Tape & Reel (TR) is optimized for high-volume automated assembly.

Q: Why should I avoid Obsolete status parts?

A: Obsolete parts have discontinued manufacturing and limited inventory availability. Active status parts ensure long-term supply chain reliability and continued manufacturer support for technical documentation and quality assurance.

Q: Can I substitute the 742792043 with BLM21RK601SN1D?

A: Yes. The BLM21RK601SN1D meets all critical parameters: 600 Ohms @ 100 MHz, 0805 package, single line, -55°C to 125°C operating range, and 200mA current rating. It offers superior DC resistance at 300mOhm and active product status.

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