Equivalent & Substitute Parts for 74279231

Part Overview

The Würth Elektronik 74279231 is a 1210 (3225 Metric) surface mount ferrite bead designed for power line filtering applications. Specified at 60 Ohms impedance @ 100 MHz with a maximum current rating of 400mA and 300mOhm DC resistance, this component operates across the -55°C to 125°C temperature range. The part is classified as obsolete, necessitating identification of active equivalent alternatives that maintain electrical and mechanical compatibility for continued system support and new production requirements.

Key Parameters

Parameter	Value
Impedance @ 100 MHz	60 Ohms
Current Rating (Max)	400mA
DC Resistance (Max)	300mOhm
Package / Case	1210 (3225 Metric)
Mounting Type	Surface Mount
Operating Temperature	-55°C ~ 125°C
Number of Lines	1
RoHS Status	ROHS3 Compliant
Moisture Sensitivity Level	1 (Unlimited)

Substitute Part Grouping Explanation

Substitution eligibility for the 74279231 is determined by the following critical parameters:

Package / Case: Must be 1210 (3225 Metric) for PCB footprint compatibility
Mounting Type: Must be Surface Mount for assembly process compatibility
Impedance @ 100 MHz: 60 Ohms is the primary electrical specification
DC Resistance (Max): 300mOhm maximum to maintain signal integrity
Operating Temperature Range: -55°C ~ 125°C minimum requirement
Number of Lines: Single line configuration

Substitute parts are grouped into two categories:

Exact Electrical Match (60 Ohms @ 100 MHz, 300mOhm DCR): Parts meeting all primary electrical specifications with identical impedance and DC resistance characteristics.

Parametric Equivalent (52 Ohms @ 100 MHz, 300mOhm DCR): Parts with slightly lower impedance but identical DC resistance and package specifications, suitable for applications where impedance tolerance permits.

Parameter Comparison

Manufacturer Part Number	Manufacturer	Impedance @ 100 MHz	Current Rating (Max)	DC Resistance (Max)	Product Status	Packaging
74279231	Würth Elektronik	60 Ohms	400mA	300mOhm	Obsolete	-
742792312	Würth Elektronik	65 Ohms	3A	30mOhm	Active	Tape & Reel (TR)
BMC2EY0052AN	TE Connectivity Passive Product	52 Ohms	400mA	300mOhm	Active	Cut Tape (CT)
BMC2EY0060AN	TE Connectivity Passive Product	60 Ohms	400mA	300mOhm	Active	Cut Tape (CT)
EMI1210R-60	API Delevan Inc.	60 Ohms	400mA	300mOhm	Active	Tape & Reel (TR)
FB322513T-520Y-S	Cal-Chip Electronics, Inc.	52 Ohms	400mA	300mOhm	Active	Tape & Reel (TR)
FB322513T-600Y-S	Cal-Chip Electronics, Inc.	60 Ohms	400mA	300mOhm	Active	Tape & Reel (TR)
FB322513T-600Y-S-1	Cal-Chip Electronics, Inc.	60 Ohms	500mA	300mOhm	Active	Tape & Reel (TR)
ILBB1210ER600V	Vishay Dale	60 Ohms	400mA	300mOhm	Active	Tape & Reel (TR)
WLBD3225K2U600PP	Walsin Technology Corporation	60 Ohms	800mA	300mOhm	Active	Tape & Reel (TR)

Engineering Selection Recommendations

Primary Substitutes (Exact Electrical Match)

BMC2EY0060AN, EMI1210R-60, FB322513T-600Y-S, FB322513T-600Y-S-1, ILBB1210ER600V, and WLBD3225K2U600PP all provide 60 Ohms impedance @ 100 MHz with 300mOhm DC resistance, matching the original 74279231 specification. All substitute parts are active products with ROHS3 compliance and MSL 1 rating. Selection among these options depends on packaging requirements (Cut Tape vs. Tape & Reel) and current rating headroom. FB322513T-600Y-S-1 and WLBD3225K2U600PP offer elevated current ratings (500mA and 800mA respectively) for applications requiring additional margin.

Secondary Substitutes (Parametric Equivalent)

BMC2EY0052AN and FB322513T-520Y-S provide 52 Ohms impedance @ 100 MHz with identical 300mOhm DC resistance and 400mA current rating. These parts are suitable for applications where impedance tolerance of ±8 Ohms from the original specification is acceptable.

Non-Recommended Alternative

742792312 (Würth Elektronik) exhibits significant parameter deviation with 65 Ohms impedance, 3A current rating, and 30mOhm DC resistance. This part is classified as a signal line ferrite bead rather than power line, and the substantially lower DC resistance and higher current rating indicate a different design intent unsuitable for direct substitution.

Frequently Asked Questions (FAQ)

Q: Can I use a 52 Ohm ferrite bead instead of the 60 Ohm original?

A: Yes, if your circuit design permits impedance tolerance. The 52 Ohm variants (BMC2EY0052AN, FB322513T-520Y-S) maintain identical DC resistance (300mOhm) and current rating (400mA) specifications. Verify that the 8 Ohm impedance reduction does not compromise EMI filtering performance in your specific application.

Q: What is the difference between Cut Tape and Tape & Reel packaging?

A: Cut Tape (CT) packaging is supplied as individual components on carrier tape, suitable for lower-volume applications and manual assembly. Tape & Reel (TR) packaging provides components on continuous reel format, optimized for high-volume automated pick-and-place assembly. Both formats are mechanically and electrically identical; selection depends on production volume and assembly equipment capability.

Q: Are all substitute parts RoHS compliant?

A: All listed substitute parts meet RoHS compliance requirements. The original 74279231 and most substitutes are ROHS3 compliant. FB322513T-520Y-S and FB322513T-600Y-S carry RoHS Compliant designation. Verify specific RoHS revision requirements for your end-use application and regional market.

Q: Can I use a substitute with higher current rating?

A: Yes. FB322513T-600Y-S-1 (500mA) and WLBD3225K2U600PP (800mA) provide higher current ratings than the original 400mA specification while maintaining all other electrical parameters. Higher current rating provides additional design margin and does not negatively impact performance in applications requiring 400mA or less.

Q: What is the Moisture Sensitivity Level (MSL) and why does it matter?

A: MSL 1 (Unlimited) indicates the component has unlimited shelf life and requires no special moisture control during storage or handling. All listed parts carry MSL 1 rating, eliminating moisture-related reliability concerns during procurement, storage, and assembly.

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