Equivalent & Substitute Parts for 74279277 Ferrite Bead 0402

Part Overview

The Würth Elektronik 74279277 is a single-line ferrite bead in 0402 (1005 Metric) surface mount package, rated at 70 Ohms impedance at 100 MHz with 500mA maximum current and 150mOhm DC resistance. This component is classified as Active product status and is RoHS3 compliant. Equivalent and substitute parts are identified based on matching or compatible electrical and mechanical parameters within the 0402 ferrite bead category, accommodating variations in impedance, current rating, and DC resistance that remain functionally suitable for signal line filtering applications.

Key Parameters

Parameter	Value
Impedance @ 100 MHz	70 Ohms
Current Rating (Max)	500mA
DC Resistance (Max)	150mOhm
Package / Case	0402 (1005 Metric)
Mounting Type	Surface Mount
Operating Temperature Range	-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

Substitute parts for the 74279277 are grouped based on compatibility within the 0402 ferrite bead category. The primary substitution criteria are:

Package compatibility: 0402 (1005 Metric) surface mount form factor
Functional category: Single-line signal ferrite bead
Operating temperature range: -55°C ~ 125°C
Impedance range: 68–80 Ohms @ 100 MHz (within acceptable tolerance band)
Current rating: 400mA minimum to 800mA maximum
DC resistance: 100mOhm to 380mOhm
Compliance: RoHS3 or RoHS compliant

Substitutes are classified as either MFR Recommended (manufacturer-endorsed alternatives) or Parametric Equivalents (parts meeting electrical and mechanical specifications). All substitute parts maintain the same package footprint, mounting type, and temperature operating range as the primary part.

Parameter Comparison

Manufacturer Part Number	Manufacturer	Impedance @ 100 MHz	Current Rating (Max)	DC Resistance (Max)	Package / Case	Height (Max)	RoHS Status	Product Status
74279277	Würth Elektronik	70 Ohms	500mA	150mOhm	0402 (1005 Metric)	0.022" (0.55mm)	ROHS3 Compliant	Active
MMZ1005D680CT000	TDK Corporation	68 Ohms	400mA	380mOhm	0402 (1005 Metric)	0.022" (0.55mm)	ROHS3 Compliant	Active
FB100505T-680Y-S	Cal-Chip Electronics, Inc.	68 Ohms	500mA	150mOhm	0402 (1005 Metric)	0.024" (0.60mm)	RoHS Compliant	Active
GZ1005U700CTF	Shenzhen Sunlord Electronics Co., Ltd.	70 Ohms	700mA	100mOhm	0402 (1005 Metric)	0.026" (0.65mm)	ROHS3 Compliant	Active
MMZ1005S800CT000	TDK Corporation	80 Ohms	500mA	120mOhm	0402 (1005 Metric)	0.022" (0.55mm)	ROHS3 Compliant	Active
MMZ1005S800HT000	TDK Corporation	80 Ohms	800mA	100mOhm	0402 (1005 Metric)	Not specified	ROHS3 Compliant	Active

Engineering Selection Recommendations

All listed substitute parts maintain Active product status and comply with RoHS regulations (ROHS3 or RoHS compliant). Selection among substitutes depends on specific circuit requirements:

MMZ1005D680CT000 (TDK) provides a 68 Ohm impedance alternative with reduced current capacity (400mA) and elevated DC resistance (380mOhm), suitable for applications where impedance tolerance is acceptable and current demand does not exceed 400mA.

FB100505T-680Y-S (Cal-Chip Electronics) matches the original 500mA current rating and 150mOhm DC resistance at 68 Ohm impedance, with marginal height increase (0.024" vs. 0.022"), maintaining functional equivalence for standard signal line applications.

GZ1005U700CTF (Sunlord) provides exact impedance match (70 Ohms) with enhanced current capacity (700mA) and reduced DC resistance (100mOhm), suitable for applications requiring higher current handling or lower insertion loss.

MMZ1005S800CT000 and MMZ1005S800HT000 (TDK) offer 80 Ohm impedance with improved DC resistance characteristics (120mOhm and 100mOhm respectively). MMZ1005S800HT000 provides maximum current capacity (800mA) for high-current signal line applications.

Frequently Asked Questions (FAQ)

Q: Can I substitute the 74279277 with a part having different impedance?

A: Yes. Ferrite bead impedance tolerance in signal line applications typically accommodates ±10% variation. The listed substitutes range from 68 to 80 Ohms, all within acceptable tolerance of the original 70 Ohm specification. Circuit performance depends on the specific filtering requirement; verify impedance selection against your application's frequency response and attenuation needs.

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

A: DC resistance (DCR) represents insertion loss in the signal path. Lower DCR values (100–120mOhm) result in reduced signal attenuation compared to higher values (150–380mOhm). Selection depends on whether signal integrity or impedance matching takes priority in your application.

Q: Are all substitutes compatible with the same PCB footprint?

A: Yes. All substitute parts use the 0402 (1005 Metric) package with identical length and width dimensions (0.039" L × 0.020" W / 1.00mm × 0.50mm). Height variations (0.022" to 0.026") are within standard PCB assembly tolerances and do not affect footprint compatibility.

Q: What is the difference between MFR Recommended and Parametric Equivalent classifications?

A: MFR Recommended substitutes (MMZ1005D680CT000) are endorsed by the original manufacturer as direct alternatives. Parametric Equivalents meet electrical and mechanical specifications but are sourced from different manufacturers. Both classifications ensure functional compatibility within the specified parameter ranges.

Q: Do all substitutes meet the same compliance standards?

A: All listed substitutes are RoHS compliant (ROHS3 or RoHS). All maintain Moisture Sensitivity Level 1 (Unlimited) and REACH Unaffected status, matching the original part's environmental and regulatory compliance profile.

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