Z0201C121ASMST Equivalent & Substitute Parts

Part Overview

The Z0201C121ASMST is a 120 Ohm ferrite bead manufactured by KEMET in the 0201 (0603 Metric) surface mount package. This component is designed for single-line signal filtering applications with a maximum current rating of 200mA and DC resistance of 500mOhm. 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 Z0201C121ASMST is classified as obsolete. Equivalent and substitute parts are available from active manufacturers including Würth Elektronik, Pulse Electronics, Murata Electronics, TE Connectivity Passive Product, Cal-Chip Electronics, and Shenzhen Sunlord Electronics. These alternatives maintain the critical electrical and mechanical specifications required for direct substitution in signal line ferrite bead applications.

Key Parameters

Parameter	Value
Impedance @ Frequency	120 Ohms @ 100 MHz
Current Rating (Max)	200mA
DC Resistance (DCR) (Max)	500mOhm
Package / Case	0201 (0603 Metric)
Mounting Type	Surface Mount
Operating Temperature	-55°C ~ 125°C
Filter Type	Signal Line
Number of Lines	1
Height (Max)	0.013" (0.33mm)
Size / Dimension	0.024" L x 0.012" W (0.60mm x 0.30mm)
RoHS Status	ROHS3 Compliant
Moisture Sensitivity Level (MSL)	1 (Unlimited)

Substitute Part Grouping Explanation

Substitution of the Z0201C121ASMST is determined by the following critical parameters:

Electrical Specifications:

Impedance must be 120 Ohms @ 100 MHz
Current rating must be equal to or greater than 200mA
DC resistance must not exceed 500mOhm

Mechanical Specifications:

Package must be 0201 (0603 Metric)
Mounting type must be Surface Mount
Physical dimensions must be 0.024" L x 0.012" W (0.60mm x 0.30mm)
Height must not exceed 0.013" (0.33mm)

Environmental & Compliance:

Operating temperature range must be -55°C to 125°C
RoHS3 compliance required
MSL rating of 1 (Unlimited) required

Substitute parts are grouped into two categories:

Category A - Exact Electrical Match (120 Ohms @ 100 MHz, 200mA, 500mOhm DCR): Parts that match all electrical specifications of the original component.

Category B - Enhanced Current Rating (120 Ohms @ 100 MHz, 250mA, 500mOhm DCR): Parts with higher current ratings that maintain impedance and DCR specifications, suitable for applications requiring additional current margin.

Category C - Lower Impedance Alternative (100 Ohms @ 100 MHz, 200mA, 400mOhm DCR): Parts with different impedance specifications, suitable only for applications where 100 Ohm impedance is acceptable.

Parameter Comparison

Manufacturer Part Number	Manufacturer	Impedance @ 100 MHz	Current Rating (Max)	DCR (Max)	Package	Height (Max)	Product Status	RoHS Status
Z0201C121ASMST	KEMET	120 Ohms	200mA	500mOhm	0201 (0603 Metric)	0.013" (0.33mm)	Obsolete	ROHS3 Compliant
742692003	Würth Elektronik	120 Ohms	200mA	450mOhm	0201 (0603 Metric)	0.013" (0.33mm)	Active	ROHS3 Compliant
BBSJ00060303121Y00	Pulse Electronics	120 Ohms	250mA	500mOhm	0201 (0603 Metric)	0.013" (0.33mm)	Active	ROHS3 Compliant
BBSY00060303121Y00	Pulse Electronics	120 Ohms	200mA	500mOhm	0201 (0603 Metric)	0.013" (0.33mm)	Active	ROHS3 Compliant
BLM03AG121SN1D	Murata Electronics	120 Ohms	200mA	500mOhm	0201 (0603 Metric)	0.013" (0.33mm)	Active	ROHS3 Compliant
BLM03BD121SN1D	Murata Electronics	120 Ohms	250mA	500mOhm	0201 (0603 Metric)	0.013" (0.33mm)	Active	ROHS3 Compliant
BMC1HY0120AN	TE Connectivity Passive Product	120 Ohms	200mA	450mOhm	0201 (0603 Metric)	0.013" (0.33mm)	Active	Not Specified
BMC1HY0100AN	TE Connectivity Passive Product	100 Ohms	200mA	400mOhm	0201 (0603 Metric)	0.013" (0.33mm)	Active	Not Specified
FB060303T-121Y-S	Cal-Chip Electronics, Inc.	120 Ohms	200mA	450mOhm	0201 (0603 Metric)	0.013" (0.33mm)	Active	RoHS Compliant
FB060303T-101Y-S	Cal-Chip Electronics, Inc.	100 Ohms	200mA	400mOhm	0201 (0603 Metric)	0.013" (0.33mm)	Active	RoHS Compliant
GZ0603D121CTF	Shenzhen Sunlord Electronics Co., Ltd.	120 Ohms	200mA	500mOhm	0201 (0603 Metric)	0.014" (0.35mm)	Active	ROHS3 Compliant

Engineering Selection Recommendations

Primary Substitutes (Exact Electrical Match):

The following parts provide direct substitution with identical electrical specifications (120 Ohms @ 100 MHz, 200mA, 500mOhm DCR):

BBSY00060303121Y00 (Pulse Electronics, Active): Identical specifications with ROHS3 compliance and MSL 1 rating. Available in Tape & Reel packaging.
BLM03AG121SN1D (Murata Electronics, Active): Identical specifications with ROHS3 compliance and MSL 1 rating. Available in Cut Tape & Digi-Reel packaging. Highest inventory availability (230,300 pcs).
GZ0603D121CTF (Shenzhen Sunlord Electronics, Active): Identical electrical specifications with ROHS3 compliance and MSL 1 rating. Height specification is 0.014" (0.35mm), which exceeds the original 0.013" (0.33mm) maximum by 0.001".

Secondary Substitutes (Enhanced Current Rating):

The following parts provide 120 Ohms @ 100 MHz impedance with increased current rating of 250mA:

BBSJ00060303121Y00 (Pulse Electronics, Active): 250mA current rating with 500mOhm DCR, ROHS3 compliant, MSL 1 rating.
BLM03BD121SN1D (Murata Electronics, Active): 250mA current rating with 500mOhm DCR, ROHS3 compliant, MSL 1 rating. Available in Tape & Reel packaging.

Lower DCR Alternatives (120 Ohms @ 100 MHz):

The following parts provide 120 Ohms @ 100 MHz impedance with reduced DC resistance of 450mOhm:

742692003 (Würth Elektronik, Active): 450mOhm DCR with 200mA current rating, ROHS3 compliant, MSL 1 rating. Available in Tape & Reel packaging.
BMC1HY0120AN (TE Connectivity Passive Product, Active): 450mOhm DCR with 200mA current rating. Available in Cut Tape packaging.
FB060303T-121Y-S (Cal-Chip Electronics, Active): 450mOhm DCR with 200mA current rating, RoHS compliant, MSL 1 rating. Available in Tape & Reel packaging.

Alternative Impedance (100 Ohms @ 100 MHz):

The following parts provide different impedance specifications and are suitable only for applications where 100 Ohm impedance is acceptable:

BMC1HY0100AN (TE Connectivity Passive Product, Active): 100 Ohms @ 100 MHz, 200mA, 400mOhm DCR.
FB060303T-101Y-S (Cal-Chip Electronics, Active): 100 Ohms @ 100 MHz, 200mA, 400mOhm DCR, RoHS compliant.

Compliance Considerations:

All recommended primary and secondary substitutes maintain ROHS3 compliance and MSL 1 (Unlimited) moisture sensitivity rating. The GZ0603D121CTF part exceeds the maximum height specification by 0.001" and should be evaluated for mechanical clearance in space-constrained applications.

Frequently Asked Questions (FAQ)

Q: Can I use a 100 Ohm ferrite bead instead of the 120 Ohm Z0201C121ASMST?

A: No, unless your circuit design specifically accommodates 100 Ohm impedance. The impedance value directly affects signal filtering characteristics. Using BMC1HY0100AN or FB060303T-101Y-S requires circuit validation to confirm performance.

Q: What is the difference between the BBSJ00060303121Y00 and BBSY00060303121Y00 parts?

A: Both are Pulse Electronics ferrite beads with 120 Ohms @ 100 MHz impedance and 500mOhm DCR. The BBSJ00060303121Y00 has a 250mA current rating, while the BBSY00060303121Y00 has a 200mA current rating matching the original Z0201C121ASMST specification.

Q: Is the GZ0603D121CTF suitable as a direct replacement?

A: The GZ0603D121CTF matches all electrical specifications and compliance requirements. However, its maximum height is 0.014" (0.35mm) compared to the original 0.013" (0.33mm). Verify mechanical clearance in your PCB layout before substitution.

Q: What is the advantage of using BLM03BD121SN1D over BLM03AG121SN1D?

A: The BLM03BD121SN1D has a higher current rating of 250mA compared to 200mA for the BLM03AG121SN1D. Both maintain 120 Ohms @ 100 MHz impedance and 500mOhm DCR. Use BLM03BD121SN1D if your application requires additional current margin.

Q: Are all substitute parts RoHS3 compliant?

A: Most substitute parts are ROHS3 compliant. The BMC1HY0120AN and BMC1HY0100AN from TE Connectivity do not specify RoHS status in the provided data. Verify compliance requirements with your procurement specifications before selection.

Q: What is the difference between Cut Tape and Tape & Reel packaging?

A: Cut Tape (CT) & Digi-Reel packaging is suitable for manual assembly and small-volume production. Tape & Reel (TR) packaging is optimized for automated pick-and-place assembly in high-volume manufacturing. Both formats contain the same component; packaging selection depends on your assembly process.

Q: Can I substitute the Z0201C121ASMST with a part having lower DC resistance?

A: Yes. Parts with lower DCR such as 742692003 (450mOhm), BMC1HY0120AN (450mOhm), and FB060303T-121Y-S (450mOhm) are suitable substitutes. Lower DCR reduces power dissipation and heat generation in the component.

Q: Why is the Z0201C121ASMST marked as obsolete?

A: The Z0201C121ASMST is classified as obsolete by KEMET. Multiple active alternatives from other manufacturers provide equivalent or superior specifications, ensuring continued availability and supply chain reliability.

Q: What does MSL 1 (Unlimited) moisture sensitivity mean?

A: MSL 1 (Unlimited) indicates the component has unlimited shelf life and does not require special moisture control during storage or handling. This is the least restrictive moisture sensitivity level.

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