Z0603C241ESMST Ferrite Bead 240 OHM 0603 Equivalent & Substitute Parts

Part Overview

The Z0603C241ESMST is a single-line ferrite bead manufactured by KEMET, designed for signal line filtering applications in 0603 (1608 Metric) surface mount packages. This component provides 240 Ohms of impedance at 100 MHz with a maximum current rating of 450mA and operates across the temperature range of -55°C to 125°C.

The Z0603C241ESMST is classified as obsolete. Identifying equivalent and substitute ferrite beads ensures design continuity and maintains supply chain reliability for applications requiring signal line filtering in compact form factors.

Key Parameters

Parameter	Value
Manufacturer Part Number	Z0603C241ESMST
Manufacturer	KEMET
Product Status	Obsolete
Filter Type	Signal Line
Number of Lines	1
Impedance @ Frequency	240 Ohms @ 100 MHz
Current Rating (Max)	450mA
DC Resistance (DCR) (Max)	250mOhm
Operating Temperature	-55°C ~ 125°C
Package / Case	0603 (1608 Metric)
Mounting Type	Surface Mount
Height (Max)	0.037" (0.95mm)
Size / Dimension	0.063" L x 0.031" W (1.60mm x 0.80mm)
RoHS Status	ROHS3 Compliant
Moisture Sensitivity Level (MSL)	1 (Unlimited)
REACH Status	REACH Unaffected

Substitute Part Grouping Explanation

Ferrite bead substitution is determined by the following critical parameters:

Primary Substitution Criteria:

Package / Case: 0603 (1608 Metric) surface mount form factor
Number of Lines: Single signal line configuration
Operating Temperature Range: -55°C ~ 125°C
Mounting Type: Surface Mount
RoHS3 Compliance and REACH Unaffected status

Secondary Compatibility Parameters:

Impedance @ 100 MHz: 240 Ohms (exact match) or 220 Ohms (near equivalent)
Current Rating: Minimum 450mA required; higher ratings provide design margin
DC Resistance (DCR): Maximum 250mOhm; lower values reduce insertion loss
Filter Type: Signal Line designation preferred for signal path applications

Substitute parts are grouped into two categories:

Category A - Exact Impedance Match (240 Ohms @ 100 MHz):

BMC1JY0240AN (TE Connectivity) - Active product status, 500mA current rating, 170mOhm DCR

Category B - Near-Equivalent Impedance (220 Ohms @ 100 MHz):

742863122 (Würth Elektronik) - Active product status, 600mA current rating, 250mOhm DCR
BBGK00160808221Y00 (Pulse Electronics) - Active product status, 550mA current rating, 180mOhm DCR
BLM18AG221SN1D (Murata Electronics) - Active product status, 500mA current rating, 250mOhm DCR
GZ1608U221CTF (Shenzhen Sunlord Electronics) - Active product status, 500mA current rating, 250mOhm DCR
MMZ1608B221CTAH0 (TDK Corporation) - Active product status, 500mA current rating, 250mOhm DCR
MMZ1608S221ATA00 (TDK Corporation) - Active product status, 500mA current rating, 200mOhm DCR

Category C - Power Line Filter Type (Not Recommended for Signal Line Applications):

HPZ1608D221-R60TF (Shenzhen Sunlord Electronics) - Power Line filter type, 220 Ohms @ 100 MHz
HPZ1608U221-R60TF (Shenzhen Sunlord Electronics) - Power Line filter type, 220 Ohms @ 100 MHz

Parameter Comparison

Manufacturer Part Number	Manufacturer	Product Status	Impedance @ 100 MHz	Current Rating (Max)	DCR (Max)	Filter Type	Package	Height (Max)	RoHS3 Compliant
Z0603C241ESMST	KEMET	Obsolete	240 Ohms	450mA	250mOhm	Signal Line	0603 (1608 Metric)	0.037" (0.95mm)	Yes
BMC1JY0240AN	TE Connectivity Passive Product	Active	240 Ohms	500mA	170mOhm	Signal Line	0603 (1608 Metric)	0.037" (0.95mm)	Yes
742863122	Würth Elektronik	Active	220 Ohms	600mA	250mOhm	Signal Line	0603 (1608 Metric)	0.037" (0.95mm)	Yes
BBGK00160808221Y00	Pulse Electronics	Active	220 Ohms	550mA	180mOhm	Not Specified	0603 (1608 Metric)	0.037" (0.95mm)	Yes
BLM18AG221SN1D	Murata Electronics	Active	220 Ohms	500mA	250mOhm	Not Specified	0603 (1608 Metric)	0.037" (0.95mm)	Yes
GZ1608U221CTF	Shenzhen Sunlord Electronics Co., Ltd.	Active	220 Ohms	500mA	250mOhm	Signal Line	0603 (1608 Metric)	0.037" (0.95mm)	Yes
MMZ1608B221CTAH0	TDK Corporation	Active	220 Ohms	500mA	250mOhm	Signal Line	0603 (1608 Metric)	0.030" (0.75mm)	Yes
MMZ1608S221ATA00	TDK Corporation	Active	220 Ohms	500mA	200mOhm	Signal Line	0603 (1608 Metric)	0.037" (0.95mm)	Yes
HPZ1608D221-R60TF	Shenzhen Sunlord Electronics Co., Ltd.	Active	220 Ohms	600mA	250mOhm	Power Line	0603 (1608 Metric)	0.037" (0.95mm)	Not Specified
HPZ1608U221-R60TF	Shenzhen Sunlord Electronics Co., Ltd.	Active	220 Ohms	600mA	250mOhm	Power Line	0603 (1608 Metric)	0.037" (0.95mm)	Not Specified

Engineering Selection Recommendations

Primary Recommendation - Exact Impedance Match:

BMC1JY0240AN (TE Connectivity Passive Product) is the preferred substitute for the Z0603C241ESMST. This part maintains the exact 240 Ohms @ 100 MHz impedance specification, operates at an active product status, and provides enhanced performance characteristics including 500mA current rating (exceeding the original 450mA requirement) and reduced DC resistance of 170mOhm. The part is RoHS3 compliant and REACH unaffected, matching the regulatory compliance profile of the original component.

Secondary Recommendations - Near-Equivalent Impedance (220 Ohms @ 100 MHz):

For applications where a 20 Ohm impedance reduction is acceptable, the following active products provide viable substitution:

MMZ1608S221ATA00 (TDK Corporation): Offers the lowest DC resistance at 200mOhm, reducing insertion loss. Active product status with 500mA current rating and full RoHS3/REACH compliance.
BBGK00160808221Y00 (Pulse Electronics): Provides 550mA current rating with 180mOhm DCR, offering improved thermal performance. Active product status with full regulatory compliance.
742863122 (Würth Elektronik): Delivers the highest current rating at 600mA with Signal Line filter type designation. Active product status with full compliance certifications.
GZ1608U221CTF (Shenzhen Sunlord Electronics): Maintains Signal Line filter type with 500mA current rating and 250mOhm DCR. Active product status with full compliance.
MMZ1608B221CTAH0 (TDK Corporation): Features the lowest profile at 0.030" (0.75mm) height, beneficial for space-constrained applications. Active product status with full compliance.
BLM18AG221SN1D (Murata Electronics): Provides 500mA current rating with 250mOhm DCR. Active product status with full compliance.

Not Recommended:

HPZ1608D221-R60TF and HPZ1608U221-R60TF are designated as Power Line ferrite beads and are not suitable for signal line filtering applications. These parts differ fundamentally in their electromagnetic characteristics and filter type classification.

All recommended substitutes maintain the 0603 (1608 Metric) surface mount package, single-line configuration, -55°C to 125°C operating temperature range, and RoHS3 compliance required for direct replacement.

Frequently Asked Questions (FAQ)

Q: Can I substitute the Z0603C241ESMST with a 220 Ohm ferrite bead?

A: Yes, ferrite beads with 220 Ohms @ 100 MHz impedance are acceptable substitutes provided all other parameters remain compatible. The 20 Ohm impedance difference represents an 8.3% reduction from the original specification. Verify that your circuit design tolerates this impedance variation. All recommended 220 Ohm alternatives maintain the same package, mounting type, temperature range, and compliance certifications as the original part.

Q: What is the difference between Signal Line and Power Line ferrite beads?

A: Signal Line ferrite beads are optimized for low-current signal path filtering, while Power Line ferrite beads are designed for higher-current power distribution applications. The HPZ series parts listed are Power Line filters and exhibit different electromagnetic characteristics unsuitable for signal line applications. Use only Signal Line designated parts or parts where filter type is not specified but all other parameters match the original Signal Line application.

Q: Does the current rating need to match exactly?

A: No. The current rating specifies the maximum continuous current the ferrite bead can handle without exceeding thermal limits. Substitute parts with equal or higher current ratings are acceptable. The original Z0603C241ESMST has a 450mA maximum rating. All recommended substitutes meet or exceed this requirement, providing design margin and improved thermal performance.

Q: Are there height differences between substitute parts?

A: Yes. Most substitute parts maintain the 0.037" (0.95mm) maximum height of the original component. However, MMZ1608B221CTAH0 features a lower profile of 0.030" (0.75mm). This reduced height is beneficial for space-constrained PCB layouts and does not affect electrical performance. Verify PCB assembly clearances if height reduction is a concern.

Q: What does DC Resistance (DCR) mean and why does it vary?

A: DC Resistance is the resistive component of the ferrite bead's impedance at direct current. Lower DCR values reduce insertion loss and heat generation in the signal path. The original part specifies 250mOhm maximum DCR. Substitute parts with lower DCR values (such as 170mOhm or 180mOhm) provide improved performance with reduced power dissipation. Higher DCR values are not recommended.

Q: Are all substitute parts RoHS3 compliant?

A: All recommended Signal Line substitutes are RoHS3 compliant. The Power Line ferrite beads (HPZ series) do not specify RoHS3 compliance status in the provided data. If RoHS3 compliance is a regulatory requirement for your application, use only the recommended Signal Line substitutes.

Q: Can I use MMZ1608B221CTAH0 if my PCB has limited vertical clearance?

A: Yes. MMZ1608B221CTAH0 has a maximum height of 0.030" (0.75mm), which is 0.007" (0.20mm) lower than the original Z0603C241ESMST and other substitutes at 0.037" (0.95mm). This reduced profile makes it suitable for applications with restricted vertical space. All other electrical and mechanical parameters remain compatible with the original specification.

Q: What packaging formats are available for these substitute parts?

A: Substitute parts are available in Tape & Reel (TR) and Cut Tape (CT) formats. BMC1JY0240AN is supplied in Cut Tape format. Most other substitutes are available in Tape & Reel format, which is standard for high-volume production assembly. Verify packaging availability with your component supplier based on your procurement volume and assembly process requirements.

Q: Is the Z0603C241ESMST still available for purchase?

A: The Z0603C241ESMST is classified as obsolete. While 1025 pieces are reported in stock, this represents limited remaining inventory. Transitioning to an active substitute part ensures long-term supply chain reliability and access to ongoing production quantities. All recommended substitutes are classified as active products with substantial inventory availability.

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