Z0603C431ESMST Ferrite Bead 430 Ohm 0603 Equivalent & Substitute Parts

Part Overview

The Z0603C431ESMST is a single-line ferrite bead manufactured by KEMET in the 0603 (1608 Metric) surface mount package. This component operates at 430 Ohms impedance at 100 MHz with a maximum current rating of 400mA and DC resistance of 300mOhm. The part is classified as obsolete, necessitating identification of active equivalent and substitute components that maintain functional compatibility within specified electrical and mechanical parameters.

Key Parameters

Parameter	Value
Impedance @ 100 MHz	430 Ohms
Current Rating (Max)	400mA
DC Resistance (Max)	300mOhm
Package / Case	0603 (1608 Metric)
Mounting Type	Surface Mount
Number of Lines	1
Operating Temperature Range	-55°C ~ 125°C
Height (Max)	0.037" (0.95mm)
RoHS Status	ROHS3 Compliant
Moisture Sensitivity Level	1 (Unlimited)

Substitute Part Grouping Explanation

Substitution of the Z0603C431ESMST is determined by the following critical parameters:

Mechanical Compatibility: All substitute parts must use the 0603 (1608 Metric) surface mount package with identical mounting type and compatible height specifications (0.037" maximum).

Electrical Compatibility: Substitute parts must operate within the same frequency range (100 MHz) with impedance values within ±10% of the original 430 Ohm specification. Current rating must equal or exceed 400mA. DC resistance must not exceed 300mOhm.

Environmental & Compliance: All substitutes must maintain operating temperature range of -55°C to 125°C, ROHS3 compliance, and MSL 1 rating.

Number of Lines: Single-line configuration is mandatory for direct substitution.

Substitute parts are grouped into two categories based on impedance proximity to the original specification:

Primary Substitutes (420-450 Ohm Range): Parts with impedance values closest to 430 Ohms, maintaining identical current and resistance specifications.

Secondary Substitutes (390-500 Ohm Range): Parts with impedance values within acceptable tolerance but with variations in current rating or DC resistance characteristics.

Parameter Comparison

Manufacturer Part Number	Manufacturer	Impedance @ 100 MHz	Current Rating (Max)	DC Resistance (Max)	Package	Height (Max)	Product Status	RoHS Status
Z0603C431ESMST	KEMET	430 Ohms	400mA	300mOhm	0603 (1608 Metric)	0.037" (0.95mm)	Obsolete	ROHS3 Compliant
FB160808T-421Y-S	Cal-Chip Electronics, Inc.	420 Ohms	400mA	300mOhm	0603 (1608 Metric)	0.037" (0.95mm)	Active	RoHS Compliant
FB160808T-451Y-S	Cal-Chip Electronics, Inc.	450 Ohms	400mA	300mOhm	0603 (1608 Metric)	0.037" (0.95mm)	Active	RoHS Compliant
BMC1JY0450AN	TE Connectivity Passive Product	450 Ohms	400mA	300mOhm	0603 (1608 Metric)	0.037" (0.95mm)	Active	ROHS3 Compliant
BBGK00160808471Y00	Pulse Electronics	470 Ohms	400mA	300mOhm	0603 (1608 Metric)	0.037" (0.95mm)	Active	ROHS3 Compliant
BLM18EG471SN1D	Murata Electronics	470 Ohms	500mA	210mOhm	0603 (1608 Metric)	0.037" (0.95mm)	Active	ROHS3 Compliant
BMC1JY0400AN	TE Connectivity Passive Product	400 Ohms	400mA	300mOhm	0603 (1608 Metric)	0.037" (0.95mm)	Active	ROHS3 Compliant
FB160808T-401Y-S	Cal-Chip Electronics, Inc.	400 Ohms	400mA	300mOhm	0603 (1608 Metric)	0.037" (0.95mm)	Active	RoHS Compliant
BLM18EG391TN1D	Murata Electronics	390 Ohms	500mA	300mOhm	0603 (1608 Metric)	0.026" (0.65mm)	Active	ROHS3 Compliant
HPZ1608D391-R70TF	Shenzhen Sunlord Electronics Co., Ltd.	390 Ohms	700mA	180mOhm	0603 (1608 Metric)	0.037" (0.95mm)	Active	REACH Unaffected
ACML-0603H-501-T	Abracon LLC	500 Ohms	800mA	280mOhm	0603 (1608 Metric)	0.037" (0.95mm)	Active	ROHS3 Compliant

Engineering Selection Recommendations

Primary Substitutes (Closest Electrical Match):

FB160808T-421Y-S and BMC1JY0450AN are the preferred substitutes. Both maintain identical current rating (400mA), DC resistance (300mOhm), and package specifications as the original Z0603C431ESMST. FB160808T-421Y-S operates at 420 Ohms, representing the closest impedance match at -2.3% deviation. BMC1JY0450AN operates at 450 Ohms (+4.7% deviation). Both components are active products with full compliance certifications.

Secondary Substitutes (Extended Impedance Range):

BBGK00160808471Y00 (Pulse Electronics, 470 Ohms) and BLM18EG471SN1D (Murata Electronics, 470 Ohms) provide functional substitution with impedance at +9.3% deviation from specification. BLM18EG471SN1D offers enhanced performance with 500mA current rating and reduced DC resistance (210mOhm). Both are active products with ROHS3 compliance.

Alternative Substitutes (Lower Impedance):

BMC1JY0400AN and FB160808T-401Y-S both operate at 400 Ohms (-7% deviation) with identical current and resistance specifications. These components are suitable where lower impedance is acceptable within circuit design parameters.

Extended Performance Options:

ACML-0603H-501-T (Abracon LLC, 500 Ohms) and HPZ1608D391-R70TF (Sunlord Electronics, 390 Ohms) provide alternatives with enhanced current ratings (800mA and 700mA respectively). These components accommodate higher current applications while maintaining package compatibility.

All recommended substitutes maintain the required operating temperature range (-55°C to 125°C), MSL 1 rating, and surface mount 0603 package configuration.

Frequently Asked Questions (FAQ)

Q: Can FB160808T-421Y-S directly replace Z0603C431ESMST in all applications?

A: FB160808T-421Y-S is mechanically and electrically compatible with Z0603C431ESMST. Both components share identical package (0603), current rating (400mA), DC resistance (300mOhm), and operating temperature range. The impedance deviation of 10 Ohms (2.3%) falls within typical circuit tolerance specifications for ferrite bead applications.

Q: What is the impedance tolerance range for acceptable substitution?

A: Substitutes with impedance values between 390 Ohms and 470 Ohms maintain functional compatibility with the original 430 Ohm specification. This represents approximately ±9% deviation. Parts outside this range may require circuit re-evaluation.

Q: Are there height differences between substitute options?

A: Most substitutes maintain the 0.037" (0.95mm) maximum height specification. BLM18EG391TN1D operates at a reduced height of 0.026" (0.65mm), which is compatible with space-constrained applications but does not affect electrical performance.

Q: Which substitute offers the best DC resistance performance?

A: BLM18EG471SN1D and HPZ1608D391-R70TF provide reduced DC resistance values of 210mOhm and 180mOhm respectively, compared to the original 300mOhm specification. Lower DC resistance reduces power dissipation in high-current applications.

Q: Can substitutes with higher current ratings be used in place of the original part?

A: Yes. Substitutes with current ratings exceeding 400mA (such as BLM18EG471SN1D at 500mA, ACML-0603H-501-T at 800mA, and HPZ1608D391-R70TF at 700mA) are fully compatible. Higher current ratings provide design margin and do not negatively impact performance in applications rated for 400mA or less.

Q: What packaging formats are available for these substitutes?

A: Substitutes are available in Tape & Reel (TR) and Cut Tape (CT) formats. FB160808T-421Y-S, FB160808T-451Y-S, and ACML-0603H-501-T are supplied in Tape & Reel. BMC1JY0400AN and BMC1JY0450AN are supplied in Cut Tape. BLM18EG471SN1D is available in Cut Tape & Digi-Reel format. Selection depends on production volume and assembly requirements.

Q: Are all substitutes RoHS compliant?

A: All recommended substitutes maintain RoHS compliance. Most are ROHS3 compliant (KEMET, Abracon LLC, Pulse Electronics, Murata Electronics, TE Connectivity). Cal-Chip Electronics parts (FB series) are RoHS Compliant. HPZ1608D391-R70TF is REACH Unaffected.

Q: What is the moisture sensitivity level for these components?

A: All substitutes maintain MSL 1 (Unlimited) rating, identical to the original Z0603C431ESMST. This classification indicates no moisture sensitivity restrictions for storage or handling.

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