Z0603C102ASMST Ferrite Bead Equivalent & Substitute Parts

Part Overview

The Z0603C102ASMST is a 1 kOhm ferrite bead manufactured by KEMET in the 0603 (1608 Metric) surface mount package. This component is designed for single-line signal filtering applications with a maximum current rating of 300mA and DC resistance of 600mOhm. 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 Z0603C102ASMST is classified as obsolete. Equivalent and substitute parts are available from multiple manufacturers with identical or superior electrical characteristics, ensuring continued design support and supply chain continuity.

Key Parameters

Parameter	Value
Impedance @ Frequency	1 kOhms @ 100 MHz
Current Rating (Max)	300mA
DC Resistance (DCR) (Max)	600mOhm
Package / Case	0603 (1608 Metric)
Mounting Type	Surface Mount
Operating Temperature	-55°C ~ 125°C
Filter Type	Signal Line
Number of Lines	1
RoHS Status	ROHS3 Compliant
Moisture Sensitivity Level (MSL)	1 (Unlimited)

Substitute Part Grouping Explanation

Substitution of the Z0603C102ASMST is determined by the following critical parameters:

Mandatory Matching Parameters:

Impedance @ Frequency: 1 kOhms @ 100 MHz
Package / Case: 0603 (1608 Metric)
Mounting Type: Surface Mount
Number of Lines: 1
Operating Temperature Range: -55°C ~ 125°C
RoHS3 Compliance
MSL 1 (Unlimited)

Allowable Variation Parameters:

Current Rating (Max): Substitute parts may equal or exceed 300mA
DC Resistance (DCR) (Max): Substitute parts may equal or be lower than 600mOhm
Height (Max): Substitute parts may equal or be lower than 0.039"
Size / Dimension: Minor variations within 0603 package tolerance

Substitute parts are grouped based on their ability to meet or exceed the electrical performance specifications while maintaining identical package and environmental compliance characteristics. Parts with higher current ratings or lower DC resistance provide enhanced performance margins without compromising circuit compatibility.

Parameter Comparison

Manufacturer Part Number	Manufacturer	Impedance @ 100 MHz	Current Rating (Max)	DCR (Max)	Package	Height (Max)	Product Status
Z0603C102ASMST	KEMET	1 kOhms	300mA	600mOhm	0603 (1608 Metric)	0.037" (0.95mm)	Obsolete
2506031027Y0	Fair-Rite Products Corp.	1 kOhms	300mA	550mOhm	0603 (1608 Metric)	0.037" (0.95mm)	Active
742792662	Würth Elektronik	1 kOhms	600mA	300mOhm	0603 (1608 Metric)	0.039" (1.00mm)	Active
742792664	Würth Elektronik	1 kOhms	300mA	600mOhm	0603 (1608 Metric)	0.039" (1.00mm)	Active
BBGK00160808102Y00	Pulse Electronics	1 kOhms	300mA	450mOhm	0603 (1608 Metric)	0.037" (0.95mm)	Active
BBSJ00160808102Y00	Pulse Electronics	1 kOhms	300mA	600mOhm	0603 (1608 Metric)	0.037" (0.95mm)	Active
BLM18AG102SN1D	Murata Electronics	1 kOhms	450mA	500mOhm	0603 (1608 Metric)	0.037" (0.95mm)	Active
BLM18HE102SN1D	Murata Electronics	1 kOhms	600mA	350mOhm	0603 (1608 Metric)	0.037" (0.95mm)	Active
BLM18HE102SZ1D	Murata Electronics	1 kOhms	600mA	350mOhm	0603 (1608 Metric)	0.037" (0.95mm)	Active
BMC1JY1000AN	TE Connectivity Passive Product	1 kOhms	300mA	550mOhm	0603 (1608 Metric)	0.037" (0.95mm)	Active
FB160808T-102Y-S	Cal-Chip Electronics, Inc.	1 kOhms	300mA	550mOhm	0603 (1608 Metric)	0.037" (0.95mm)	Active

Engineering Selection Recommendations

All listed substitute parts are active products with RoHS3 compliance and MSL 1 (Unlimited) moisture sensitivity ratings, ensuring regulatory compliance and supply chain availability.

Direct Electrical Equivalents (300mA, 600mOhm DCR):

Würth Elektronik 742792664
Pulse Electronics BBSJ00160808102Y00

These parts provide identical electrical specifications to the original Z0603C102ASMST and are suitable for direct replacement in existing designs without circuit modification.

Enhanced Performance Substitutes (Lower DCR):

Fair-Rite Products Corp. 2506031027Y0 (550mOhm DCR)
Pulse Electronics BBGK00160808102Y00 (450mOhm DCR)
TE Connectivity BMC1JY1000AN (550mOhm DCR)
Cal-Chip Electronics FB160808T-102Y-S (550mOhm DCR)

These parts maintain the 300mA current rating while reducing DC resistance, resulting in lower insertion loss and improved thermal performance.

High Current Capability Substitutes (600mA Rating):

Würth Elektronik 742792662 (300mOhm DCR)
Murata Electronics BLM18HE102SN1D (350mOhm DCR)
Murata Electronics BLM18HE102SZ1D (350mOhm DCR)

These parts support double the current capacity with significantly reduced DC resistance, suitable for applications requiring higher current handling or lower power dissipation.

Balanced Performance Substitute:

Murata Electronics BLM18AG102SN1D (450mA, 500mOhm DCR)

This part offers intermediate current capability and DC resistance characteristics.

Frequently Asked Questions (FAQ)

Q: Can I use a substitute part with higher current rating than the original Z0603C102ASMST?

A: Yes. Substitute parts with current ratings of 450mA or 600mA are electrically compatible. Higher current ratings indicate the component can safely handle greater current without exceeding thermal limits. This provides additional design margin without affecting circuit operation at the original 300mA specification.

Q: What is the significance of DC Resistance (DCR) differences between substitute parts?

A: DC Resistance affects power dissipation and insertion loss in the signal path. Substitute parts with lower DCR values (such as 300mOhm or 350mOhm) dissipate less power than the original 600mOhm specification. This is beneficial for thermal management but does not affect impedance matching or filtering characteristics at 100 MHz.

Q: Are all substitute parts compatible with the same PCB footprint as the Z0603C102ASMST?

A: Yes. All substitute parts use the 0603 (1608 Metric) surface mount package with identical footprint dimensions. Minor height variations (0.037" to 0.039") do not affect PCB assembly compatibility or clearance requirements for standard designs.

Q: What is the difference between Cut Tape (CT) and Tape & Reel (TR) packaging?

A: Cut Tape packaging is supplied in individual strips suitable for small-volume or prototype applications. Tape & Reel packaging is supplied on continuous reels for high-volume automated assembly. Both packaging formats contain identical components; the difference is in supply format and handling method.

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

A: Yes. All listed substitute parts are RoHS3 compliant with MSL 1 (Unlimited) moisture sensitivity rating and operate across the -55°C to 125°C temperature range, matching the original Z0603C102ASMST specifications.

Q: Which substitute part should I select for a new design?

A: Selection depends on application requirements. For direct replacement in existing designs, use Würth Elektronik 742792664 or Pulse Electronics BBSJ00160808102Y00. For improved thermal performance, use Pulse Electronics BBGK00160808102Y00 or Fair-Rite Products Corp. 2506031027Y0. For high-current applications, use Würth Elektronik 742792662 or Murata Electronics BLM18HE102SN1D or BLM18HE102SZ1D.

Q: Is the Würth Elektronik 742792662 with 600mA rating suitable for a 300mA application?

A: Yes. The 600mA rating indicates maximum safe current capacity. Operating at 300mA is well within this limit and provides additional thermal margin. The lower 300mOhm DCR also reduces power dissipation compared to the original 600mOhm specification.

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