MMZ2012S301AT000 Equivalent & Substitute Parts

Part Overview

The MMZ2012S301AT000 is a 300 Ohm ferrite bead in 0805 (2012 Metric) surface mount package manufactured by TDK Corporation. This single-line signal ferrite bead operates at 100 MHz with a maximum current rating of 600mA and DC resistance of 200mOhm. The part is classified as Last Time Buy, indicating end-of-life status. Equivalent and substitute parts are necessary to ensure design continuity and maintain supply chain flexibility for applications requiring 300 Ohm impedance ferrite filtering at 100 MHz.

Key Parameters

Parameter	Value
Impedance @ 100 MHz	300 Ohms
Package / Case	0805 (2012 Metric)
Number of Lines	1
Current Rating (Max)	600mA
DC Resistance (Max)	200mOhm
Operating Temperature	-55°C ~ 125°C
Mounting Type	Surface Mount
RoHS Status	ROHS3 Compliant

Substitute Part Grouping Explanation

Substitute parts for the MMZ2012S301AT000 are categorized based on the following substitution criteria:

Direct Substitutes (Same Package, Same Impedance): Parts maintaining 300 Ohms @ 100 MHz impedance in 0805 (2012 Metric) package with compatible current ratings and DC resistance specifications.

Manufacturer Recommended Substitutes: Parts designated by manufacturers as direct replacements, maintaining electrical and mechanical compatibility.

Parametric Equivalents: Parts with impedance values within acceptable tolerance ranges (240-330 Ohms @ 100 MHz) in the same 0805 package, suitable for applications where exact impedance matching is not critical.

Size Variants: Parts with different package sizes (0603) but identical impedance and electrical characteristics, applicable when board space permits downsizing.

The primary parameters determining substitution eligibility are: impedance @ 100 MHz, package size, number of signal lines, current rating capacity, and DC resistance specifications.

Parameter Comparison

Manufacturer Part Number	Manufacturer	Impedance @ 100 MHz	Package	Current Rating (Max)	DC Resistance (Max)	Operating Temperature	Product Status
MMZ2012S301AT000	TDK Corporation	300 Ohms	0805 (2012 Metric)	600mA	200mOhm	-55°C ~ 125°C	Last Time Buy
MMZ1608S301ATA00	TDK Corporation	300 Ohms	0603 (1608 Metric)	500mA	300mOhm	-55°C ~ 125°C	Active
MH2029-301Y	Bourns Inc.	300 Ohms	0805 (2012 Metric)	1A	200mOhm	-55°C ~ 125°C	Active
MFBW1V2012-301-R	Eaton - Electronics Division	300 Ohms	0805 (2012 Metric)	2A	200mOhm	-40°C ~ 85°C	Active
BBGK00201209301Y00	Pulse Electronics	300 Ohms	0805 (2012 Metric)	700mA	180mOhm	-55°C ~ 125°C	Active
BLM21AG331SN1D	Murata Electronics	330 Ohms	0805 (2012 Metric)	700mA	160mOhm	-55°C ~ 125°C	Active
Z0805C241ASMST	KEMET	240 Ohms	0805 (2012 Metric)	600mA	200mOhm	-55°C ~ 125°C	Obsolete
Z0805C241BSMST	KEMET	240 Ohms	0805 (2012 Metric)	600mA	200mOhm	-55°C ~ 125°C	Obsolete

Engineering Selection Recommendations

For Direct Replacement (Same Package, Active Status): MH2029-301Y (Bourns Inc.) and BBGK00201209301Y00 (Pulse Electronics) are active products maintaining 300 Ohms @ 100 MHz impedance in 0805 package. Both are ROHS3 compliant with unlimited moisture sensitivity level. MH2029-301Y offers higher current capacity (1A) with identical DC resistance. BBGK00201209301Y00 provides lower DC resistance (180mOhm) with 700mA capacity.

For Enhanced Current Capacity: MFBW1V2012-301-R (Eaton - Electronics Division) supports 2A maximum current while maintaining 300 Ohms impedance and 200mOhm DC resistance in 0805 package. Operating temperature range is -40°C ~ 85°C. This part is suitable for applications requiring higher current handling than the original 600mA specification.

For Size Optimization: MMZ1608S301ATA00 (TDK Corporation) provides 300 Ohms @ 100 MHz impedance in smaller 0603 (1608 Metric) package. Current rating is 500mA with 300mOhm DC resistance. This option is applicable when board space reduction is prioritized and current requirements do not exceed 500mA.

For Parametric Tolerance: BLM21AG331SN1D (Murata Electronics) operates at 330 Ohms @ 100 MHz, representing a 10% impedance increase from the original specification. This part is suitable for applications where impedance tolerance permits deviation within this range. Current capacity is 700mA with superior DC resistance of 160mOhm.

Avoid Obsolete Parts: Z0805C241ASMST and Z0805C241BSMST (KEMET) are classified as Obsolete. These parts operate at 240 Ohms @ 100 MHz and should not be selected for new designs despite matching package and current specifications.

Frequently Asked Questions (FAQ)

Q: Can MMZ1608S301ATA00 replace MMZ2012S301AT000 directly? A: MMZ1608S301ATA00 maintains identical impedance (300 Ohms @ 100 MHz) and operating temperature range but uses a smaller 0603 package instead of 0805. Current rating is reduced to 500mA. Direct replacement is possible only if board layout accommodates the smaller package and application current does not exceed 500mA.

Q: What is the difference between MH2029-301Y and BBGK00201209301Y00? A: Both maintain 300 Ohms @ 100 MHz in 0805 package with -55°C ~ 125°C operating range. MH2029-301Y (Bourns) supports 1A maximum current with 200mOhm DC resistance. BBGK00201209301Y00 (Pulse Electronics) supports 700mA with lower DC resistance of 180mOhm. Selection depends on current requirements and power dissipation considerations.

Q: Why is BLM21AG331SN1D listed as a substitute if impedance differs? A: BLM21AG331SN1D operates at 330 Ohms @ 100 MHz, representing a 10% deviation from the 300 Ohm specification. This part is classified as a parametric equivalent suitable for applications where impedance tolerance permits this variation. Verify application requirements before substitution.

Q: Should MFBW1V2012-301-R be used if current requirements are only 600mA? A: MFBW1V2012-301-R supports 2A maximum current, exceeding the 600mA requirement. This part is suitable for applications requiring higher current capacity or future design margin. Operating temperature range is -40°C ~ 85°C, which is narrower than the original -55°C ~ 125°C specification. Verify temperature requirements before selection.

Q: Are Z0805C241ASMST and Z0805C241BSMST viable alternatives? A: Both KEMET parts are classified as Obsolete with 240 Ohms @ 100 MHz impedance. These parts should not be selected for new designs due to obsolescence status, despite matching package and current specifications. Active alternatives with identical or superior specifications are available.

Q: What packaging formats are available for these substitutes? A: MMZ2012S301AT000 is supplied in Tape & Reel (TR) format. MMZ1608S301ATA00 is also Tape & Reel. MH2029-301Y, MFBW1V2012-301-R, and BBGK00201209301Y00 are Tape & Reel. BLM21AG331SN1D is supplied in Cut Tape (CT) & Digi-Reel® format. Z0805C241ASMST and Z0805C241BSMST are Cut Tape (CT). Verify packaging compatibility with assembly processes.

Q: Are all substitutes ROHS3 compliant? A: All listed parts are ROHS3 compliant and REACH unaffected. Moisture sensitivity level is 1 (Unlimited) for all parts, indicating no special moisture handling requirements during storage or assembly.

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