Z0402C680CSMST Ferrite Bead 68 Ohm 0402 Equivalent & Substitute Parts

Part Overview

The Z0402C680CSMST is a 68 Ohm ferrite bead manufactured by KEMET in the 0402 (1005 Metric) surface mount package. This single-line signal ferrite bead operates at 68 Ohms impedance at 100 MHz with a maximum current rating of 400mA and DC resistance of 310mOhm. 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	68 Ohms
Current Rating (Max)	400mA
DC Resistance (Max)	310mOhm
Package / Case	0402 (1005 Metric)
Operating Temperature Range	-55°C ~ 125°C
Mounting Type	Surface Mount
Filter Type	Signal Line
Number of Lines	1
RoHS Status	ROHS3 Compliant
Moisture Sensitivity Level	1 (Unlimited)

Substitute Part Grouping Explanation

Substitution for the Z0402C680CSMST is determined by the following critical parameters:

Primary Substitution Criteria:

Package / Case: 0402 (1005 Metric)
Mounting Type: Surface Mount
Filter Type: Signal Line
Number of Lines: 1
Operating Temperature Range: -55°C ~ 125°C
RoHS Status: ROHS3 Compliant
Moisture Sensitivity Level: 1 (Unlimited)

Secondary Substitution Parameters:

Impedance @ 100 MHz: 68 Ohms (exact match preferred; 60-80 Ohm range acceptable with design verification)
Current Rating (Max): 400mA minimum
DC Resistance (Max): 310mOhm maximum

Substitute parts are grouped into two categories:

Category 1: Parametric Equivalents (Identical Impedance) Parts with 68 Ohms @ 100 MHz impedance matching the original specification.

Category 2: Similar Impedance Range (60-80 Ohms) Parts with impedance within ±12 Ohms of the original 68 Ohm specification, suitable for applications where impedance tolerance permits substitution.

Parameter Comparison

Manufacturer Part Number	Manufacturer	Impedance @ 100 MHz	Current Rating (Max)	DC Resistance (Max)	Product Status	Packaging
Z0402C680CSMST	KEMET	68 Ohms	400mA	310mOhm	Obsolete	Cut Tape (CT) & Digi-Reel®
Z0402C680ESMST	KEMET	68 Ohms	500mA	170mOhm	Obsolete	Cut Tape (CT)
MMZ1005D680CTD25	TDK Corporation	68 Ohms	400mA	380mOhm	Active	Tape & Reel (TR)
7427927160	Würth Elektronik	60 Ohms	400mA	300mOhm	Active	Tape & Reel (TR)
7427927170	Würth Elektronik	75 Ohms	400mA	310mOhm	Active	Tape & Reel (TR)
74279277	Würth Elektronik	70 Ohms	500mA	150mOhm	Active	Tape & Reel (TR)
BBNQ00100505750Y00	Pulse Electronics	75 Ohms	400mA	300mOhm	Active	Tape & Reel (TR)
BBSJ00100505600Y00	Pulse Electronics	60 Ohms	500mA	200mOhm	Active	Tape & Reel (TR)
BBSJ00100505800Y00	Pulse Electronics	80 Ohms	500mA	200mOhm	Active	Tape & Reel (TR)
BBSY00100505600Y00	Pulse Electronics	60 Ohms	500mA	200mOhm	Active	Tape & Reel (TR)
BBSY00100505700Y00	Pulse Electronics	70 Ohms	600mA	150mOhm	Active	Tape & Reel (TR)

Engineering Selection Recommendations

First Priority: Parametric Equivalents with Active Status

Z0402C680ESMST (KEMET) is a parametric equivalent with identical 68 Ohm impedance at 100 MHz. Although classified as obsolete, it offers the closest electrical match. The higher current rating (500mA vs. 400mA) and lower DC resistance (170mOhm vs. 310mOhm) provide improved performance margins.

MMZ1005D680CTD25 (TDK Corporation) is an active product with 68 Ohm impedance matching the original specification. It maintains the 400mA current rating and includes AEC-Q200 automotive qualification. The DC resistance of 380mOhm is slightly higher than the original 310mOhm specification.

Second Priority: Active Substitutes with Similar Impedance (±12 Ohms)

For applications where impedance tolerance permits substitution within the 60-80 Ohm range:

74279277 (Würth Elektronik WE-CBF series) provides 70 Ohms @ 100 MHz with enhanced current rating (500mA) and significantly lower DC resistance (150mOhm). This part is active and widely available.

BBSY00100505700Y00 (Pulse Electronics BBSY series) offers 70 Ohms @ 100 MHz with 600mA current rating and 150mOhm DC resistance. This part is active with high inventory availability.

7427927170 (Würth Elektronik WE-CBF series) provides 75 Ohms @ 100 MHz with matching 400mA current rating and identical 310mOhm DC resistance. This part is active.

BBNQ00100505750Y00 (Pulse Electronics BBNQ series) offers 75 Ohms @ 100 MHz with 400mA current rating and 300mOhm DC resistance. This part is active with extensive inventory.

Compliance Verification

All substitute parts listed maintain ROHS3 compliance, Moisture Sensitivity Level 1 (Unlimited), and the required 0402 (1005 Metric) surface mount package. All parts operate within the -55°C ~ 125°C temperature range.

Frequently Asked Questions (FAQ)

Q: Can Z0402C680ESMST directly replace Z0402C680CSMST?

A: Z0402C680ESMST is a parametric equivalent with identical 68 Ohm impedance at 100 MHz and matching package specifications. Both parts are classified as obsolete. The substitute has higher current rating (500mA vs. 400mA) and lower DC resistance (170mOhm vs. 310mOhm), which are performance improvements. Electrical compatibility is confirmed for signal line ferrite bead applications.

Q: What is the difference between parametric equivalents and similar impedance substitutes?

A: Parametric equivalents maintain the exact 68 Ohm impedance specification at 100 MHz. Similar impedance substitutes operate within the 60-80 Ohm range. Selection depends on circuit design tolerance for impedance variation. Applications with strict impedance requirements should use parametric equivalents. Applications with impedance tolerance can use similar impedance parts.

Q: Why do some substitutes have higher current ratings than the original part?

A: Higher current ratings indicate improved thermal performance and lower power dissipation characteristics. A substitute with 500mA or 600mA rating can safely operate at the original 400mA specification with additional margin. This does not affect compatibility; it provides design flexibility for future applications.

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

A: The original Z0402C680CSMST uses Cut Tape (CT) & Digi-Reel® packaging. Most active substitutes are supplied in Tape & Reel (TR) format, which is standard for high-volume production. Both packaging formats are compatible with automated assembly equipment. Verify packaging requirements with your procurement process.

Q: What does DC Resistance (DCR) variation mean for circuit performance?

A: DC Resistance represents the resistive component of the ferrite bead impedance. Lower DCR values reduce power dissipation and heat generation at operating current. The original part specifies 310mOhm maximum. Substitutes with lower DCR (150-200mOhm) provide improved efficiency. Substitutes with higher DCR (380mOhm) remain within acceptable performance range for signal line applications.

Q: Can I use a 75 Ohm substitute in a circuit designed for 68 Ohms?

A: Substitution depends on circuit design tolerance. The 75 Ohm part represents a +10.3% impedance increase from the 68 Ohm specification. For EMI filtering and signal integrity applications, verify that the circuit design accommodates this impedance variation. Consult circuit design documentation to confirm acceptable impedance tolerance range.

Q: What is the significance of AEC-Q200 qualification on MMZ1005D680CTD25?

A: AEC-Q200 is an automotive qualification standard indicating the part meets reliability and performance requirements for automotive applications. This certification is not present on the original Z0402C680CSMST. If your application requires automotive qualification, MMZ1005D680CTD25 is the appropriate choice among parametric equivalents.

Q: How does Moisture Sensitivity Level 1 affect handling and storage?

A: Moisture Sensitivity Level 1 (Unlimited) indicates the part has no moisture sensitivity restrictions. No baking or special moisture control procedures are required before soldering. All listed substitutes maintain MSL 1 classification, ensuring consistent handling requirements across all alternatives.

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