Z0603C601ASMST Ferrite Bead 600 Ohm 0603 Equivalent & Substitute Parts

Part Overview

The Z0603C601ASMST is a 600 Ohm ferrite bead manufactured by KEMET in the 0603 (1608 Metric) surface mount package. This single-line signal ferrite bead operates at 100 MHz impedance with a maximum current rating of 350mA and 450mOhm DC resistance. The component is classified as obsolete, making identification of equivalent and substitute parts essential for ongoing design support and procurement continuity. Active alternatives from multiple manufacturers provide functional equivalence while maintaining the same package footprint and electrical performance specifications.

Key Parameters

Parameter	Z0603C601ASMST
Impedance @ Frequency	600 Ohms @ 100 MHz
Current Rating (Max)	350mA
DC Resistance (Max)	450mOhm
Package / Case	0603 (1608 Metric)
Mounting Type	Surface Mount
Operating Temperature	-55°C ~ 125°C
Number of Lines	1
Filter Type	Signal Line
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)

Substitute Part Grouping Explanation

Substitution eligibility for the Z0603C601ASMST is determined by the following critical parameters:

Primary Matching Criteria:

Impedance @ 100 MHz: 600 Ohms (exact match required)
Package / Case: 0603 (1608 Metric) (exact match required)
Number of Lines: 1 (exact match required)
Mounting Type: Surface Mount (exact match required)
Operating Temperature Range: -55°C ~ 125°C (exact match required)

Secondary Compatibility Parameters:

Current Rating (Max): 350mA minimum (equal or greater acceptable)
DC Resistance (Max): 450mOhm maximum (equal or lower acceptable)
Height (Max): 0.037" (0.95mm) maximum (equal or lower acceptable)
RoHS Status: ROHS3 Compliant (compliance required)
Moisture Sensitivity Level: 1 (Unlimited) (compliance required)

Substitute parts meeting all primary criteria and maintaining or improving secondary parameters are classified as direct equivalents. Parts with impedance values other than 600 Ohms are listed for reference but do not qualify as functional substitutes for this application.

Parameter Comparison

Manufacturer Part Number	Manufacturer	Impedance @ 100 MHz	Current Rating (Max)	DC Resistance (Max)	Package / Case	Height (Max)	Product Status	RoHS Status
Z0603C601ASMST	KEMET	600 Ohms	350mA	450mOhm	0603 (1608 Metric)	0.037" (0.95mm)	Obsolete	ROHS3 Compliant
742792651	Würth Elektronik	600 Ohms	1A	200mOhm	0603 (1608 Metric)	0.039" (1.00mm)	Active	ROHS3 Compliant
2506036017Y0	Fair-Rite Products Corp.	600 Ohms	400mA	350mOhm	0603 (1608 Metric)	0.037" (0.95mm)	Active	ROHS3 Compliant
742863160	Würth Elektronik	600 Ohms	500mA	350mOhm	0603 (1608 Metric)	0.037" (0.95mm)	Active	ROHS3 Compliant
BBGK00160808601Y00	Pulse Electronics	600 Ohms	400mA	300mOhm	0603 (1608 Metric)	0.037" (0.95mm)	Active	ROHS3 Compliant
BBSJ00160808601Y00	Pulse Electronics	600 Ohms	400mA	400mOhm	0603 (1608 Metric)	0.037" (0.95mm)	Active	ROHS3 Compliant
BLM18AG601SN1D	Murata Electronics	600 Ohms	500mA	380mOhm	0603 (1608 Metric)	0.037" (0.95mm)	Active	ROHS3 Compliant
BLM18AG601SZ1D	Murata Electronics	600 Ohms	500mA	380mOhm	0603 (1608 Metric)	0.037" (0.95mm)	Active	ROHS3 Compliant
BLM18EG601SN1D	Murata Electronics	600 Ohms	500mA	350mOhm	0603 (1608 Metric)	0.037" (0.95mm)	Active	ROHS3 Compliant
FB160808T-601Y-S	Cal-Chip Electronics, Inc.	600 Ohms	450mA	400mOhm	0603 (1608 Metric)	0.037" (0.95mm)	Active	RoHS Compliant

Engineering Selection Recommendations

Direct Equivalents (Recommended for Replacement):

The following parts satisfy all primary matching criteria and maintain or improve secondary electrical parameters while offering active product status:

BLM18EG601SN1D (Murata Electronics): Matches impedance, package, and operating temperature. Provides 500mA current rating (143% of original) with 350mOhm DC resistance (22% improvement). ROHS3 compliant with unlimited MSL. Cut Tape packaging available with 1,685,229 units in stock.
BLM18AG601SN1D (Murata Electronics): Matches impedance, package, and operating temperature. Provides 500mA current rating (143% of original) with 380mOhm DC resistance (16% improvement). ROHS3 compliant with unlimited MSL. Cut Tape packaging available with 70,100 units in stock.
742863160 (Würth Elektronik WE-CBF HF): Matches impedance, package, and operating temperature. Provides 500mA current rating (143% of original) with 350mOhm DC resistance (22% improvement). ROHS3 compliant with unlimited MSL. Tape & Reel packaging with 4,100 units in stock.
FB160808T-601Y-S (Cal-Chip Electronics): Matches impedance, package, and operating temperature. Provides 450mA current rating (129% of original) with 400mOhm DC resistance (11% improvement). RoHS compliant with unlimited MSL. Tape & Reel packaging with 461,045 units in stock.

Acceptable Alternatives (Marginal Compatibility):

2506036017Y0 (Fair-Rite Products Corp.): Matches impedance, package, and operating temperature. Provides 400mA current rating (114% of original) with 350mOhm DC resistance (22% improvement). ROHS3 compliant. Height matches original specification exactly.
BBSJ00160808601Y00 (Pulse Electronics): Matches impedance, package, and operating temperature. Provides 400mA current rating (114% of original) with 400mOhm DC resistance (11% improvement). ROHS3 compliant. Limited inventory (1,093 units).
BBGK00160808601Y00 (Pulse Electronics): Matches impedance, package, and operating temperature. Provides 400mA current rating (114% of original) with 300mOhm DC resistance (33% improvement). ROHS3 compliant. High inventory availability (144,129 units).

Conditional Substitute (Height Consideration):

742792651 (Würth Elektronik WE-CBF): Matches impedance and operating temperature. Provides 1A current rating (286% of original) with 200mOhm DC resistance (56% improvement). Height specification is 0.039" (1.00mm), exceeding the original 0.037" (0.95mm) maximum. ROHS3 compliant. Verify PCB clearance before selection.

Non-Equivalent Reference:

FB160808T-501Y-S (Cal-Chip Electronics): Impedance is 500 Ohms @ 100 MHz, not 600 Ohms. Does not qualify as functional substitute despite matching package and other parameters.

Frequently Asked Questions (FAQ)

Q: Can I use a substitute part with higher current rating than the original Z0603C601ASMST?

A: Yes. The original part is rated for 350mA maximum current. Substitute parts with equal or higher current ratings (400mA, 500mA, or 1A) are acceptable and provide design margin. The circuit application determines actual current draw, not the component rating.

Q: What is the significance of DC Resistance (DCR) differences between the original and substitute parts?

A: DC Resistance affects signal insertion loss and heat generation. Lower DCR values (200mOhm to 350mOhm) are preferable to higher values (450mOhm). All listed substitutes maintain DCR at or below the original 450mOhm specification, with most providing 22% to 56% improvement.

Q: Does the height difference in part 742792651 affect PCB assembly?

A: The 742792651 has a maximum height of 0.039" (1.00mm) compared to the original 0.037" (0.95mm). This 0.04mm difference is minimal but must be verified against PCB clearance requirements, particularly in space-constrained designs or applications with height restrictions.

Q: Are all substitute parts ROHS3 compliant?

A: All listed substitutes are ROHS3 compliant except FB160808T-601Y-S, which is RoHS compliant. Both certifications meet current regulatory requirements. Verify compliance requirements for your specific application and region.

Q: What is the difference between Cut Tape (CT) and Tape & Reel (TR) packaging?

A: Cut Tape packaging is supplied on tape but cut into individual strips for smaller quantities. Tape & Reel packaging is supplied on continuous reels for automated assembly. Both formats contain identical components. Selection depends on procurement volume and assembly equipment compatibility.

Q: Can I substitute BLM18AG601SN1D (Cut Tape) with BLM18AG601SZ1D (Tape & Reel)?

A: Yes. Both parts are electrically and mechanically identical. The difference is packaging format only. BLM18AG601SN1D is available in Cut Tape with 70,100 units in stock. BLM18AG601SZ1D is available in Tape & Reel with 2,484 units in stock. Select based on procurement and assembly requirements.

Q: Why is the original Z0603C601ASMST marked as obsolete?

A: Obsolete status indicates KEMET has discontinued production. Active alternatives from Murata Electronics, Würth Elektronik, Pulse Electronics, Fair-Rite Products, and Cal-Chip Electronics provide equivalent or superior performance, ensuring design continuity and supply chain reliability.

Q: Are there any electrical performance differences between manufacturers?

A: All listed substitutes maintain the 600 Ohms @ 100 MHz impedance specification. Variations exist in DC Resistance (200mOhm to 450mOhm) and current rating (400mA to 1A). These differences represent manufacturing process variations and material compositions. All parts meet the original electrical requirements.

Q: What inventory considerations should I evaluate?

A: BLM18EG601SN1D offers the highest inventory (1,685,229 units), followed by FB160808T-601Y-S (461,045 units) and BBGK00160808601Y00 (144,129 units). Lower inventory parts like BLM18AG601SZ1D (2,484 units) and 742863160 (4,100 units) may have longer lead times. Procurement strategy should balance availability with electrical performance requirements.

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