Z0603C330ASMST Ferrite Bead Equivalent & Substitute Parts

Part Overview

The Z0603C330ASMST is a 33 Ohm ferrite bead manufactured by KEMET in the 0603 (1608 Metric) surface mount package. This component is designed for single-line signal filtering applications with a maximum current rating of 1.2A and DC resistance of 80mOhm. 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 Z0603C330ASMST is classified as obsolete. Equivalent and substitute ferrite beads are available from active manufacturers including Abracon LLC, Shenzhen Sunlord Electronics, TDK Corporation, and Walsin Technology Corporation. These alternatives provide comparable or enhanced electrical performance within the same physical package footprint.

Key Parameters

Parameter	Value
Manufacturer Part Number	Z0603C330ASMST
Manufacturer	KEMET
Series	Z-SMS
Product Status	Obsolete
Filter Type	Signal Line
Number of Lines	1
Impedance @ Frequency	33 Ohms @ 100 MHz
Current Rating (Max)	1.2A
DC Resistance (DCR) (Max)	80mOhm
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

Substitution of the Z0603C330ASMST ferrite bead is determined by the following critical parameters:

Package Compatibility: All substitute parts must use the 0603 (1608 Metric) surface mount package with identical mounting type and physical dimensions to ensure PCB layout compatibility.

Electrical Performance: Substitute parts are grouped based on impedance value at 100 MHz. The original part specifies 33 Ohms @ 100 MHz. Substitute parts with 30 Ohms @ 100 MHz represent a 9% reduction in impedance and are functionally equivalent for most signal line filtering applications. Substitute parts with 31 Ohms @ 100 MHz represent a 6% reduction and provide closer impedance matching.

Current Rating: The original part supports 1.2A maximum current. Substitute parts with equal or higher current ratings (1.3A, 1.5A, 1.8A, or 2A) are acceptable for direct replacement without derating considerations.

DC Resistance (DCR): The original part specifies 80mOhm maximum DCR. Substitute parts with equal or lower DCR values (50mOhm or 60mOhm) are acceptable and provide improved thermal performance.

Filter Type and Application: The original part is designated for signal line filtering. Substitute parts designated for power line filtering are included in this reference as they share identical package specifications and can function in signal line applications with enhanced current handling capability.

Environmental and Compliance Ratings: All substitute parts maintain RoHS3 compliance, MSL 1 (Unlimited) moisture sensitivity, and operate across the -55°C to 125°C temperature range, ensuring regulatory and environmental compatibility.

Parameter Comparison

Manufacturer Part Number	Manufacturer	Impedance @ 100 MHz	Current Rating (Max)	DCR (Max)	Filter Type	Product Status	Inventory
Z0603C330ASMST	KEMET	33 Ohms	1.2A	80mOhm	Signal Line	Obsolete	741 Pcs
ACML-0603H-310-T	Abracon LLC	31 Ohms	1.5A	50mOhm	Signal Line	Active	834 Pcs
ACML-0603U-300-T	Abracon LLC	30 Ohms	1.8A	60mOhm	Power Line	Active	1055 Pcs
GZ1608D300TF	Shenzhen Sunlord Electronics	30 Ohms	2A	50mOhm	Signal Line	Active	77400 Pcs
GZ1608U300TF	Shenzhen Sunlord Electronics	30 Ohms	2A	50mOhm	Signal Line	Active	8750 Pcs
MMZ1608R300ATA00	TDK Corporation	30 Ohms	1.5A	50mOhm	Signal Line	Active	4400 Pcs
MMZ1608Y300BTA00	TDK Corporation	30 Ohms	1.5A	50mOhm	Signal Line	Active	85300 Pcs
MPZ1608D300BTA00	TDK Corporation	30 Ohms	1.8A	60mOhm	Power Line	Active	37200 Pcs
UPZ1608G300-1R8TF	Shenzhen Sunlord Electronics	30 Ohms	1.8A	60mOhm	Power Line	Active	687 Pcs
WLBD1608K2U300TP	Walsin Technology Corporation	30 Ohms	1.3A	80mOhm	Not Specified	Active	1014 Pcs

Engineering Selection Recommendations

Primary Substitutes (Closest Electrical Match):

The ACML-0603H-310-T from Abracon LLC provides the closest impedance match at 31 Ohms @ 100 MHz, representing only a 6% deviation from the original 33 Ohm specification. This part is active, RoHS3 compliant, and offers improved current handling (1.5A) and reduced DCR (50mOhm) compared to the obsolete original.

High-Availability Substitutes (30 Ohm @ 100 MHz):

The GZ1608D300TF from Shenzhen Sunlord Electronics offers the highest inventory availability (77,400 Pcs) with 30 Ohms @ 100 MHz impedance, 2A current rating, and 50mOhm DCR. This part is active and suitable for applications where the 9% impedance reduction is acceptable.

The MMZ1608Y300BTA00 from TDK Corporation provides substantial inventory (85,300 Pcs) with 30 Ohms @ 100 MHz, 1.5A current rating, and 50mOhm DCR. This part is active and widely available for immediate procurement.

Power Line Filtering Alternatives:

For applications requiring enhanced current handling and lower impedance stability, the MPZ1608D300BTA00 from TDK Corporation and ACML-0603U-300-T from Abracon LLC both provide 30 Ohms @ 100 MHz with 1.8A current rating and 60mOhm DCR. These parts are designated for power line filtering but are compatible with signal line applications.

Compliance and Regulatory Status:

All substitute parts maintain RoHS3 compliance, MSL 1 (Unlimited) moisture sensitivity rating, and operate across the -55°C to 125°C temperature range. All parts are REACH Unaffected or REACH compliant. The WLBD1608K2U300TP from Walsin Technology Corporation matches the original DCR specification at 80mOhm while providing active product status and improved current handling at 1.3A.

Frequently Asked Questions (FAQ)

Q: Can I use a 30 Ohm ferrite bead as a direct replacement for the 33 Ohm Z0603C330ASMST?

A: Yes. The 30 Ohm @ 100 MHz substitute parts represent a 9% reduction in impedance from the original 33 Ohm specification. This impedance variance is within acceptable tolerances for signal line filtering applications. The substitute parts provide equal or superior current handling and reduced DC resistance, making them functionally equivalent for most circuit designs.

Q: What is the difference between signal line and power line ferrite beads in this package?

A: Signal line ferrite beads are optimized for lower current applications with emphasis on impedance performance. Power line ferrite beads are designed for higher current handling with enhanced thermal characteristics. In the 0603 package, both types share identical physical dimensions and can be used interchangeably. Power line variants typically offer higher current ratings (1.8A versus 1.5A) and may have slightly different DCR specifications (60mOhm versus 50mOhm).

Q: Are all substitute parts available in the same packaging format?

A: All substitute parts are available in 0603 (1608 Metric) surface mount package with identical physical dimensions (0.063" L x 0.031" W or 1.60mm x 0.80mm). Most substitute parts are supplied in Tape & Reel (TR) packaging. The original KEMET part does not specify packaging format in the provided data. Verify packaging requirements with your procurement specification before ordering.

Q: Which substitute part offers the best inventory availability?

A: The GZ1608D300TF from Shenzhen Sunlord Electronics offers the highest inventory availability at 77,400 Pcs. The MMZ1608Y300BTA00 from TDK Corporation provides the second-highest availability at 85,300 Pcs. Both parts are active products with 30 Ohms @ 100 MHz impedance and 50mOhm DCR.

Q: Do all substitute parts meet the same environmental and compliance standards as the original?

A: Yes. All substitute parts are RoHS3 compliant with MSL 1 (Unlimited) moisture sensitivity rating and operate across the -55°C to 125°C temperature range. All parts are REACH Unaffected or REACH compliant. Environmental and regulatory compatibility is maintained across all substitute options.

Q: What is the significance of DC Resistance (DCR) in ferrite bead selection?

A: DC Resistance represents the resistive loss of the ferrite bead at DC and low frequencies. Lower DCR values reduce power dissipation and heat generation. The original part specifies 80mOhm maximum DCR. Most substitute parts offer 50mOhm or 60mOhm DCR, providing improved thermal performance and reduced power loss in the circuit.

Q: Can I substitute a ferrite bead with higher current rating than required?

A: Yes. Ferrite beads with higher current ratings than the circuit requirement are acceptable substitutes. The GZ1608D300TF and GZ1608U300TF both provide 2A current rating compared to the original 1.2A specification. Higher current ratings do not negatively impact circuit performance and provide additional design margin.

Q: How do I determine if a substitute part is compatible with my PCB layout?

A: All substitute parts use the 0603 (1608 Metric) surface mount package with identical physical dimensions and mounting type. PCB footprints designed for the original Z0603C330ASMST are compatible with all listed substitute parts without modification. Verify that your PCB design accommodates the maximum height specification of 0.037" (0.95mm).

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