Z0805C431ASMST Ferrite Bead Equivalent & Substitute Parts

Part Overview

The Z0805C431ASMST is a 430 Ohm ferrite bead manufactured by KEMET in the 0805 (2012 Metric) surface mount package. This component functions as a single-line signal filter for electromagnetic interference suppression in electronic circuits. The part is classified as obsolete, necessitating identification of equivalent substitute components that maintain electrical and mechanical compatibility with existing designs.

Key Parameters

Parameter	Value
Impedance @ Frequency	430 Ohms @ 100 MHz
Current Rating (Max)	500mA
DC Resistance (DCR) (Max)	250mOhm
Package / Case	0805 (2012 Metric)
Mounting Type	Surface Mount
Operating Temperature Range	-55°C ~ 125°C
Number of Lines	1
Height (Max)	0.041" (1.05mm)
Size / Dimension	0.079" L x 0.049" W (2.00mm x 1.25mm)
RoHS Status	ROHS3 Compliant
Moisture Sensitivity Level (MSL)	1 (Unlimited)

Substitute Part Grouping Explanation

Substitute ferrite beads for the Z0805C431ASMST are selected based on strict electrical and mechanical compatibility criteria. The primary substitution parameters are:

Electrical Compatibility:

Impedance value at 100 MHz (430 Ohms nominal, with 470 Ohms as the closest available standard value)
Current rating capability (minimum 500mA required)
DC resistance within acceptable limits (250mOhm maximum)
Operating temperature range (-55°C ~ 125°C)

Mechanical Compatibility:

Package type: 0805 (2012 Metric) surface mount
Physical dimensions: 0.079" L x 0.049" W (2.00mm x 1.25mm)
Single signal line configuration
Height compatibility (maximum 0.043")

Regulatory Compliance:

RoHS3 compliance
Moisture Sensitivity Level 1 (Unlimited)
REACH Unaffected status

The substitute parts listed operate at 470 Ohms @ 100 MHz, representing the nearest standard impedance value to the original 430 Ohm specification. This impedance variance is within typical ferrite bead tolerance ranges and maintains functional equivalence for signal line filtering applications.

Parameter Comparison

Manufacturer Part Number	Manufacturer	Impedance @ 100 MHz	Current Rating (Max)	DCR (Max)	Package	Operating Temp	Product Status	RoHS Status
Z0805C431ASMST	KEMET	430 Ohms	500mA	250mOhm	0805 (2012 Metric)	-55°C ~ 125°C	Obsolete	ROHS3 Compliant
Z0805C471BSMST	KEMET	470 Ohms	500mA	250mOhm	0805 (2012 Metric)	-55°C ~ 125°C	Obsolete	ROHS3 Compliant
BK2125HM471-T	Taiyo Yuden	470 Ohms	500mA	250mOhm	0805 (2012 Metric)	-55°C ~ 125°C	Obsolete	ROHS3 Compliant
BLM21AG471SN1D	Murata Electronics	470 Ohms	700mA	190mOhm	0805 (2012 Metric)	-55°C ~ 125°C	Active	ROHS3 Compliant
FB201209T-471Y-S	Cal-Chip Electronics, Inc.	470 Ohms	700mA	180mOhm	0805 (2012 Metric)	-55°C ~ 125°C	Active	RoHS Compliant

Engineering Selection Recommendations

Primary Substitutes (Active Product Status):

BLM21AG471SN1D (Murata Electronics) and FB201209T-471Y-S (Cal-Chip Electronics, Inc.) are the preferred substitutes for the obsolete Z0805C431ASMST. Both components are in active production status, ensuring long-term availability and supply chain continuity. These parts exceed the original specifications with higher current ratings (700mA versus 500mA) and lower DC resistance values (190mOhm and 180mOhm respectively versus 250mOhm), providing enhanced performance margins in signal line filtering applications.

Secondary Substitutes (Obsolete Product Status):

Z0805C471BSMST (KEMET) and BK2125HM471-T (Taiyo Yuden) are parametrically equivalent alternatives within the same impedance class. These components maintain identical electrical and mechanical specifications to the original part but share obsolete product status, limiting their suitability for new designs requiring long-term component availability.

Compliance Considerations:

All substitute parts maintain ROHS3 compliance and Moisture Sensitivity Level 1 (Unlimited) ratings, ensuring compatibility with standard manufacturing and storage protocols. The FB201209T-471Y-S component carries RoHS Compliant certification rather than ROHS3 Compliant; this distinction does not preclude substitution but should be noted for regulatory documentation purposes.

Frequently Asked Questions (FAQ)

Q: Can the Z0805C431ASMST be directly replaced with a 470 Ohm ferrite bead?

A: Yes. The 470 Ohm impedance value at 100 MHz represents the nearest standard ferrite bead impedance to the original 430 Ohm specification. This 40 Ohm variance falls within typical ferrite bead tolerance ranges and maintains functional equivalence for signal line filtering applications.

Q: What is the significance of the impedance difference between 430 Ohms and 470 Ohms?

A: The impedance difference of 40 Ohms (approximately 9.3% variance) is within acceptable substitution parameters for ferrite bead applications. Both values operate at the same frequency (100 MHz) and provide equivalent electromagnetic interference suppression characteristics for single-line signal filtering.

Q: Are the active product substitutes (BLM21AG471SN1D and FB201209T-471Y-S) backward compatible with the original Z0805C431ASMST?

A: Yes. Both active substitutes maintain identical package dimensions (0805 / 2012 Metric), mounting type (surface mount), operating temperature range (-55°C ~ 125°C), and physical footprint. The enhanced current ratings (700mA versus 500mA) and reduced DC resistance values provide improved performance without compromising compatibility.

Q: What packaging options are available for the substitute parts?

A: BLM21AG471SN1D is available in Cut Tape (CT) and Digi-Reel® packaging. FB201209T-471Y-S is supplied in Tape & Reel (TR) format. Z0805C471BSMST is available in Cut Tape (CT) and Digi-Reel® packaging. BK2125HM471-T is supplied in Cut Tape (CT) format. Selection should align with manufacturing assembly requirements and inventory management protocols.

Q: Do all substitute parts meet the same regulatory compliance standards?

A: All substitute parts are ROHS3 Compliant or RoHS Compliant and maintain Moisture Sensitivity Level 1 (Unlimited) ratings. The FB201209T-471Y-S component carries RoHS Compliant certification; this designation is functionally equivalent for substitution purposes.

Q: What is the maximum height difference between the original part and substitutes?

A: The original Z0805C431ASMST has a maximum height of 0.041" (1.05mm). The FB201209T-471Y-S substitute has a maximum height of 0.043" (1.10mm), representing a 0.002" (0.05mm) variance. This minimal difference does not impact PCB assembly or component clearance in standard 0805 package applications.

Q: Are there inventory considerations when selecting between substitute parts?

A: Yes. FB201209T-471Y-S maintains the highest inventory availability (32,788 pieces in stock), followed by BLM21AG471SN1D (3,180 pieces). Z0805C471BSMST (2,629 pieces) and BK2125HM471-T (1,079 pieces) have lower availability. For applications requiring immediate procurement or high-volume production, FB201209T-471Y-S is the optimal selection.

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