FB03YTYN121 Ferrite Bead 120 Ohm 0603 Equivalent & Substitute Parts

Part Overview

The FB03YTYN121 is a surface mount ferrite bead manufactured by Stackpole Electronics Inc., designed for electromagnetic interference (EMI) suppression in single-line applications. This 0603 (1608 Metric) package component operates at 120 Ohms impedance at 100 MHz with a maximum current rating of 400mA and DC resistance of 250mOhm. The part is Active status and operates across the temperature range of -55°C to 125°C. Equivalent and substitute parts are identified based on matching or exceeding the electrical and mechanical specifications of the original component, enabling design flexibility and supply chain alternatives.

Key Parameters

Parameter	Value
Impedance @ 100 MHz	120 Ohms
Current Rating (Max)	400mA
DC Resistance (Max)	250mOhm
Package / Case	0603 (1608 Metric)
Mounting Type	Surface Mount
Operating Temperature	-55°C ~ 125°C
Number of Lines	1
Height (Max)	0.037" (0.95mm)
Size / Dimension	0.063" L x 0.031" W (1.60mm x 0.80mm)

Substitute Part Grouping Explanation

Substitute parts for the FB03YTYN121 are classified based on the following substitution criteria:

Primary Substitution Criteria:

Package / Case: 0603 (1608 Metric) - exact match required for PCB footprint compatibility
Mounting Type: Surface Mount - required for assembly process compatibility
Operating Temperature: -55°C ~ 125°C - minimum requirement
Number of Lines: 1 - single-line configuration required

Electrical Parameter Matching:

Impedance @ 100 MHz: 120 Ohms (exact match) or 100 Ohms (acceptable alternative for less stringent filtering)
Current Rating (Max): 400mA minimum (higher ratings acceptable for thermal margin)
DC Resistance (Max): 250mOhm (lower values acceptable for reduced insertion loss)

Substitute parts are grouped into two categories: Direct Equivalents (120 Ohm impedance matching) and Parametric Alternatives (100 Ohm impedance with compatible electrical characteristics). All substitute parts maintain the 0603 package footprint and single-line configuration.

Parameter Comparison

Manufacturer Part Number	Manufacturer	Impedance @ 100 MHz	Current Rating (Max)	DC Resistance (Max)	Package / Case	Height (Max)	Operating Temperature	Product Status
FB03YTYN121	Stackpole Electronics Inc	120 Ohms	400mA	250mOhm	0603 (1608 Metric)	0.037" (0.95mm)	-55°C ~ 125°C	Active
2506031217Y0	Fair-Rite Products Corp.	120 Ohms	400mA	150mOhm	0603 (1608 Metric)	0.037" (0.95mm)	-55°C ~ 125°C	Active
BBBK00160808121Y00	Pulse Electronics	120 Ohms	400mA	250mOhm	0603 (1608 Metric)	0.037" (0.95mm)	-55°C ~ 125°C	Active
BBGK00160808121Y00	Pulse Electronics	120 Ohms	600mA	150mOhm	0603 (1608 Metric)	0.037" (0.95mm)	-55°C ~ 125°C	Active
BLM18AG121SN1D	Murata Electronics	120 Ohms	800mA	180mOhm	0603 (1608 Metric)	0.037" (0.95mm)	-55°C ~ 125°C	Active
FB160808T-121Y-S-1	Cal-Chip Electronics, Inc.	120 Ohms	600mA	250mOhm	0603 (1608 Metric)	0.037" (0.95mm)	-55°C ~ 125°C	Active
FCM 1608KF-121T06	TAI-TECH Advanced Electronics Co., Ltd.	120 Ohms	600mA	250mOhm	0603 (1608 Metric)	0.037" (0.95mm)	-55°C ~ 125°C	Active
2506031017Y0	Fair-Rite Products Corp.	100 Ohms	400mA	150mOhm	0603 (1608 Metric)	0.037" (0.95mm)	-55°C ~ 125°C	Active
742792620	Würth Elektronik	100 Ohms	500mA	150mOhm	0603 (1608 Metric)	0.039" (1.00mm)	-55°C ~ 125°C	Active
742792621	Würth Elektronik	140 Ohms	550mA	200mOhm	0603 (1608 Metric)	0.039" (1.00mm)	-55°C ~ 125°C	Active
BMC1JY0100AN	TE Connectivity Passive Product	100 Ohms	400mA	150mOhm	0603 (1608 Metric)	0.037" (0.95mm)	-55°C ~ 125°C	Active

Engineering Selection Recommendations

Direct Equivalent Selection (120 Ohm Impedance):

The following parts provide direct electrical equivalence to the FB03YTYN121 with 120 Ohms impedance at 100 MHz:

2506031217Y0 (Fair-Rite Products Corp.): Identical impedance and current rating with reduced DC resistance (150mOhm vs. 250mOhm), resulting in lower insertion loss. ROHS3 Compliant, MSL 1.
BBBK00160808121Y00 (Pulse Electronics): Exact electrical match with identical impedance, current rating, and DC resistance. ROHS3 Compliant, MSL 1. Suitable for direct replacement.
BBGK00160808121Y00 (Pulse Electronics): 120 Ohm impedance with enhanced current rating (600mA) and reduced DC resistance (150mOhm). ROHS3 Compliant, MSL 1. Recommended for applications requiring higher current capacity.
BLM18AG121SN1D (Murata Electronics, EMIFIL® series): 120 Ohm impedance with superior current rating (800mA) and reduced DC resistance (180mOhm). ROHS3 Compliant, MSL 1. Recommended for high-current applications.
FB160808T-121Y-S-1 (Cal-Chip Electronics, Inc.): 120 Ohm impedance with enhanced current rating (600mA). RoHS Compliant, MSL 1. Suitable for applications requiring higher current margin.
FCM 1608KF-121T06 (TAI-TECH Advanced Electronics Co., Ltd.): 120 Ohm impedance with enhanced current rating (600mA). RoHS Compliant, MSL 1.

Parametric Alternative Selection (100 Ohm Impedance):

The following parts provide reduced impedance (100 Ohms) suitable for applications where lower filtering impedance is acceptable:

2506031017Y0 (Fair-Rite Products Corp.): 100 Ohm impedance with reduced DC resistance (150mOhm). ROHS3 Compliant, MSL 1.
BMC1JY0100AN (TE Connectivity Passive Product): 100 Ohm impedance with reduced DC resistance (150mOhm). ROHS3 Compliant, MSL 1.
742792620 (Würth Elektronik, WE-CBF series): 100 Ohm impedance with enhanced current rating (500mA) and reduced DC resistance (150mOhm). Height 0.039" (1.00mm). ROHS3 Compliant, MSL 1.

Higher Impedance Alternative:

742792621 (Würth Elektronik, WE-CBF series): 140 Ohm impedance with enhanced current rating (550mA) and reduced DC resistance (200mOhm). Height 0.039" (1.00mm). ROHS3 Compliant, MSL 1. Suitable for applications requiring higher filtering impedance.

All substitute parts maintain Active product status and operate within the -55°C to 125°C temperature range. Selection should be based on specific application requirements for impedance, current capacity, and insertion loss characteristics.

Frequently Asked Questions (FAQ)

Q: Can I substitute a 100 Ohm ferrite bead for the 120 Ohm FB03YTYN121?

A: Yes, 100 Ohm ferrite beads (2506031017Y0, BMC1JY0100AN, 742792620) are acceptable substitutes if your application tolerates reduced filtering impedance. The lower impedance provides less EMI attenuation but maintains compatibility with the 0603 package footprint and single-line configuration. Verify that your circuit design does not require the specific 120 Ohm filtering characteristic.

Q: What is the difference between the FB03YTYN121 and BBBK00160808121Y00?

A: Both parts have identical electrical specifications: 120 Ohms impedance, 400mA current rating, and 250mOhm DC resistance. The primary difference is the manufacturer (Stackpole Electronics Inc. vs. Pulse Electronics). Both are Active status and operate across -55°C to 125°C. BBBK00160808121Y00 is ROHS3 Compliant with MSL 1.

Q: Why would I choose BBGK00160808121Y00 over the original FB03YTYN121?

A: BBGK00160808121Y00 offers enhanced performance with 600mA current rating (vs. 400mA) and reduced DC resistance of 150mOhm (vs. 250mOhm). These improvements provide greater thermal margin and lower insertion loss while maintaining the same 120 Ohm impedance and 0603 package footprint. ROHS3 Compliant, MSL 1.

Q: Are there any height differences between substitute parts?

A: Most substitute parts maintain the 0.037" (0.95mm) maximum height of the FB03YTYN121. However, Würth Elektronik parts (742792620, 742792621) have a maximum height of 0.039" (1.00mm). Verify PCB clearance requirements before selecting these alternatives.

Q: What does DC Resistance (DCR) mean in ferrite bead selection?

A: DC Resistance is the resistive loss of the ferrite bead at DC or very low frequencies. Lower DCR values (150mOhm vs. 250mOhm) result in reduced insertion loss and less signal attenuation in the passband. Selection depends on whether your application prioritizes low insertion loss or maximum EMI filtering.

Q: Can I use BLM18AG121SN1D as a direct replacement?

A: Yes, BLM18AG121SN1D is a direct replacement with identical 120 Ohm impedance and 0603 package footprint. It offers superior current rating (800mA vs. 400mA) and reduced DC resistance (180mOhm vs. 250mOhm), making it suitable for high-current applications. ROHS3 Compliant, MSL 1.

Q: What is the significance of the 0603 (1608 Metric) package designation?

A: The 0603 package is a standard surface mount component size measuring 0.063" L x 0.031" W (1.60mm x 0.80mm). All substitute parts listed maintain this package footprint, ensuring PCB compatibility without layout modifications. Package consistency is critical for automated assembly processes.

Q: Are all substitute parts RoHS compliant?

A: All substitute parts listed are either ROHS3 Compliant or RoHS Compliant. ROHS3 Compliant parts meet the most current RoHS 3 directive requirements. Verify specific compliance requirements for your application and regional regulations.

Q: What is Moisture Sensitivity Level (MSL)?

A: MSL indicates the maximum time a component can be exposed to moisture before soldering. MSL 1 (Unlimited) means the component has unlimited shelf life without special moisture control, making it suitable for standard storage and handling conditions. All substitute parts listed have MSL 1.

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