Z0603C511CSMST Ferrite Bead Equivalent & Substitute Parts

Part Overview

The Z0603C511CSMST is a 510 Ohm signal line ferrite bead manufactured by KEMET in the 0603 (1608 Metric) surface mount package. This component operates at 100 MHz impedance with a maximum current rating of 200mA and DC resistance of 900mOhm. The part is classified as obsolete, necessitating identification of equivalent and substitute components for ongoing design requirements and procurement needs. Equivalent parts maintain identical or closely matched electrical characteristics, while substitute parts offer functional alternatives within acceptable parameter ranges for signal line ferrite bead applications.

Key Parameters

Parameter	Value	Unit
Impedance @ 100 MHz	510	Ohms
Current Rating (Max)	200	mA
DC Resistance (Max)	900	mOhm
Package / Case	0603 (1608 Metric)	—
Mounting Type	Surface Mount	—
Operating Temperature Range	-55 to 125	°C
Filter Type	Signal Line	—
Number of Lines	1	—
RoHS Status	ROHS3 Compliant	—
Moisture Sensitivity Level	1 (Unlimited)	—

Substitute Part Grouping Explanation

Substitution of the Z0603C511CSMST is determined by the following critical parameters: impedance value at 100 MHz, current rating capacity, DC resistance, package dimensions (0603/1608 Metric), surface mount compatibility, and operating temperature range (-55°C to 125°C). Parts are grouped into three categories:

Parametric Equivalents (KEMET Z-SMS Series): Parts Z0603C431CSMST, Z0603C601BSMST, and Z0603C601ESMST maintain identical package, mounting type, and temperature range. These parts vary in impedance (430 Ohms, 600 Ohms) and current ratings (200mA to 300mA), offering alternatives when the exact 510 Ohm specification is not critical to circuit function.

Similar Manufacturer Parts (Active Status): Würth Elektronik and Fair-Rite Products Corp. components provide functionally equivalent signal line ferrite beads in 0603 package with active product status. These include 782632511 (510 Ohms, 300mA), 742792642 (470 Ohms, 200mA), 742792643 (470 Ohms, 400mA), 74279265 (600 Ohms, 200mA), 742792653 (600 Ohms, 300mA), 742861160 (600 Ohms, 200mA), and 2506036017H0 (600 Ohms, 200mA).

All substitute parts comply with RoHS3, maintain MSL 1 rating, and operate within the specified temperature range. Selection is based on impedance tolerance, current capacity requirements, and DC resistance specifications for the target application.

Parameter Comparison

Manufacturer Part Number	Manufacturer	Impedance @ 100 MHz (Ohms)	Current Rating Max (mA)	DC Resistance Max (mOhm)	Package / Case	Product Status	RoHS Status
Z0603C511CSMST	KEMET	510	200	900	0603 (1608 Metric)	Obsolete	ROHS3 Compliant
Z0603C431CSMST	KEMET	430	200	850	0603 (1608 Metric)	Obsolete	ROHS3 Compliant
Z0603C601BSMST	KEMET	600	250	600	0603 (1608 Metric)	Obsolete	ROHS3 Compliant
Z0603C601ESMST	KEMET	600	300	400	0603 (1608 Metric)	Obsolete	ROHS3 Compliant
782632511	Würth Elektronik	510	300	350	0603 (1608 Metric)	Active	ROHS3 Compliant
2506036017H0	Fair-Rite Products Corp.	600	200	80	0603 (1608 Metric)	Active	ROHS3 Compliant
742792642	Würth Elektronik	470	200	450	0603 (1608 Metric)	Active	ROHS3 Compliant
742792643	Würth Elektronik	470	400	350	0603 (1608 Metric)	Active	ROHS3 Compliant
74279265	Würth Elektronik	600	200	450	0603 (1608 Metric)	Active	ROHS3 Compliant
742792653	Würth Elektronik	600	300	650	0603 (1608 Metric)	Active	ROHS3 Compliant
742861160	Würth Elektronik	600	200	900	0603 (1608 Metric)	Active	ROHS3 Compliant

Engineering Selection Recommendations

For Exact Impedance Match (510 Ohms @ 100 MHz): The Würth Elektronik 782632511 provides the closest functional equivalent with identical impedance specification. This part carries active product status, ensuring long-term availability and supply chain stability. The 782632511 offers superior current capacity (300mA versus 200mA) and significantly lower DC resistance (350mOhm versus 900mOhm), providing performance advantages in applications sensitive to insertion loss and thermal dissipation.

For Impedance Tolerance Applications: When circuit design permits impedance variation within ±10% to ±20% of the 510 Ohm specification, the Würth Elektronik WE-CBF series parts (742792642, 742792643 at 470 Ohms) and 600 Ohm variants (74279265, 742792653, 742861160) are suitable alternatives. These components maintain active product status and full RoHS3 compliance.

For Lowest DC Resistance Requirement: The Fair-Rite Products Corp. 2506036017H0 delivers the lowest DC resistance (80mOhm) among available substitutes, beneficial for applications where insertion loss minimization is critical. This part maintains 600 Ohm impedance at 100 MHz with 200mA current rating.

For Enhanced Current Capacity: Applications requiring current ratings exceeding 200mA should utilize Würth Elektronik 742792643 (400mA at 470 Ohms) or Z0603C601ESMST (300mA at 600 Ohms). Both parts maintain the 0603 package and full temperature range compatibility.

All recommended substitutes comply with RoHS3 regulations, maintain MSL 1 moisture sensitivity rating, and operate across the -55°C to 125°C temperature range. Selection should be based on specific impedance, current, and DC resistance requirements of the target application circuit.

Frequently Asked Questions (FAQ)

Q: Can Z0603C511CSMST be directly replaced with 782632511? A: Yes. Both parts specify 510 Ohms impedance at 100 MHz in the 0603 (1608 Metric) surface mount package. The 782632511 offers improved specifications with 300mA current capacity and 350mOhm DC resistance. Active product status ensures continued availability.

Q: What is the impedance tolerance range for acceptable substitution? A: Substitution acceptability depends on circuit requirements. Parts within ±10% impedance variation (459 to 561 Ohms) maintain close functional equivalence. The 470 Ohm and 600 Ohm variants represent ±8% and ±18% deviation respectively and are suitable for applications with broader impedance tolerance specifications.

Q: Are all substitute parts compatible with existing PCB layouts designed for Z0603C511CSMST? A: All listed substitutes use the 0603 (1608 Metric) package with surface mount configuration. Physical dimensions are compatible with existing PCB footprints. Height variations (0.037" to 0.039") are within standard assembly tolerances.

Q: Which substitute offers the best performance for high-frequency signal integrity applications? A: The Fair-Rite Products Corp. 2506036017H0 provides the lowest DC resistance (80mOhm), minimizing insertion loss and signal attenuation. For applications requiring exact impedance matching at 510 Ohms, the Würth Elektronik 782632511 is the optimal choice.

Q: Do all substitute parts meet RoHS3 compliance requirements? A: Yes. All listed equivalent and substitute parts carry ROHS3 Compliant certification. All parts maintain MSL 1 (Unlimited) moisture sensitivity level and REACH Unaffected status.

Q: What is the difference between KEMET Z-SMS series and Würth Elektronik WE-CBF series ferrite beads? A: Both series provide signal line ferrite beads in 0603 package with identical operating temperature range. KEMET Z-SMS parts are obsolete; Würth Elektronik WE-CBF series maintains active product status. Würth Elektronik components generally offer lower DC resistance and higher current ratings for equivalent impedance values.

Q: Can 600 Ohm ferrite beads substitute for 510 Ohm applications? A: Substitution is application-dependent. The 600 Ohm variants (Z0603C601BSMST, Z0603C601ESMST, 74279265, 742792653, 742861160, 2506036017H0) represent an 18% impedance increase. Circuits with impedance-sensitive filtering requirements should maintain the 510 Ohm specification or verify tolerance margins before substitution.

Q: What packaging options are available for substitute parts? A: KEMET Z-SMS series parts are supplied in Cut Tape (CT) or Cut Tape & Digi-Reel packaging. Würth Elektronik and Fair-Rite Products Corp. substitutes are supplied in Tape & Reel (TR) format, standard for high-volume production environments.

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