SZ1608G331CTF Ferrite Bead Equivalent & Substitute Parts

Part Overview

The SZ1608G331CTF is a single-line ferrite bead manufactured by Shenzhen Sunlord Electronics Co., Ltd., designed for signal line filtering applications. This 0603 (1608 Metric) surface mount component operates at 330 Ohms impedance at 100 MHz with a maximum current rating of 500mA and operates across the temperature range of -55°C to 125°C. The part is currently in active production status with 953 units in stock.

Equivalent and substitute parts are identified when design requirements necessitate alternative sourcing due to supply constraints, manufacturing discontinuation, or specific performance optimization needs within the allowed electrical and mechanical parameter ranges.

Key Parameters

Parameter	Value	Unit
Impedance @ Frequency	330 Ohms @ 100 MHz	Ohms
Current Rating (Max)	500	mA
DC Resistance (DCR) (Max)	700	mOhm
Package / Case	0603 (1608 Metric)	—
Mounting Type	Surface Mount	—
Operating Temperature	-55°C ~ 125°C	°C
Filter Type	Signal Line	—
Number of Lines	1	—
Moisture Sensitivity Level (MSL)	1 (Unlimited)	—

Substitute Part Grouping Explanation

Substitution of the SZ1608G331CTF is determined by strict adherence to the following electrical and mechanical parameters:

Primary Substitution Criteria:

Package / Case: 0603 (1608 Metric) surface mount form factor
Mounting Type: Surface Mount
Number of Lines: 1 (single signal line)
Operating Temperature Range: -55°C ~ 125°C minimum
Moisture Sensitivity Level: MSL 1 or equivalent

Electrical Parameter Compatibility:

Impedance @ 100 MHz: 330 Ohms (exact match) or within ±60 Ohms (270–390 Ohms range)
Current Rating (Max): 500mA or greater
DC Resistance (DCR) (Max): 700mOhm or lower

Substitute parts are grouped into two categories:

Category A – Exact Impedance Match (330 Ohms @ 100 MHz): Parts with identical impedance specification allow direct replacement without circuit redesign. These include BLM18AG331SN1D, BLM18EG331TN1D, and FB160808T-331Y-S.

Category B – Impedance Variation (300 Ohms or 390 Ohms @ 100 MHz): Parts with 300 Ohms impedance (GZ1608D301CTF, BMC1JY0300AN, FCM 1608KF-301T05, MMZ1608B301CTAH0, MMZ1608R301ATA00, MMZ1608R301CTAH0) or 390 Ohms impedance (BLM18EG391TN1D) fall within acceptable tolerance ranges for signal line filtering applications where impedance variation does not compromise circuit performance.

Parameter Comparison

Manufacturer Part Number	Manufacturer	Impedance @ 100 MHz	Current Rating (Max)	DCR (Max)	Package / Case	Height (Max)	Operating Temperature	Product Status	RoHS Status
SZ1608G331CTF	Shenzhen Sunlord Electronics Co., Ltd.	330 Ohms	500mA	700mOhm	0603 (1608 Metric)	0.037" (0.95mm)	-55°C ~ 125°C	Active	—
GZ1608D301CTF	Shenzhen Sunlord Electronics Co., Ltd.	300 Ohms	500mA	350mOhm	0603 (1608 Metric)	0.037" (0.95mm)	-55°C ~ 125°C	Active	ROHS3 Compliant
BLM18AG331SN1D	Murata Electronics	330 Ohms	500mA	300mOhm	0603 (1608 Metric)	0.037" (0.95mm)	-55°C ~ 125°C	Active	ROHS3 Compliant
BLM18EG331TN1D	Murata Electronics	330 Ohms	500mA	210mOhm	0603 (1608 Metric)	0.026" (0.65mm)	-55°C ~ 125°C	Active	ROHS3 Compliant
BLM18EG391TN1D	Murata Electronics	390 Ohms	500mA	300mOhm	0603 (1608 Metric)	0.026" (0.65mm)	-55°C ~ 125°C	Active	ROHS3 Compliant
BMC1JY0300AN	TE Connectivity Passive Product	300 Ohms	600mA	200mOhm	0603 (1608 Metric)	0.037" (0.95mm)	-55°C ~ 125°C	Active	ROHS3 Compliant
FB160808T-331Y-S	Cal-Chip Electronics, Inc.	330 Ohms	500mA	300mOhm	0603 (1608 Metric)	0.037" (0.95mm)	-55°C ~ 125°C	Active	RoHS Compliant
FCM 1608KF-301T05	TAI-TECH Advanced Electronics Co., Ltd.	300 Ohms	500mA	350mOhm	0603 (1608 Metric)	0.037" (0.95mm)	-55°C ~ 125°C	Active	ROHS3 Compliant
MMZ1608B301CTAH0	TDK Corporation	300 Ohms	500mA	250mOhm	0603 (1608 Metric)	0.030" (0.75mm)	-55°C ~ 125°C	Active	ROHS3 Compliant
MMZ1608R301ATA00	TDK Corporation	300 Ohms	500mA	250mOhm	0603 (1608 Metric)	0.037" (0.95mm)	-55°C ~ 125°C	Active	ROHS3 Compliant
MMZ1608R301CTAH0	TDK Corporation	300 Ohms	500mA	250mOhm	0603 (1608 Metric)	0.030" (0.75mm)	-55°C ~ 125°C	Not For New Designs	ROHS3 Compliant

Engineering Selection Recommendations

Active Production Status Preference: All substitute parts listed maintain active production status except MMZ1608R301CTAH0, which carries a "Not For New Designs" designation. For new circuit designs, selection should prioritize parts with active status to ensure long-term supply continuity and manufacturing consistency.

Compliance and Certification: Substitute parts from Murata Electronics (BLM18AG331SN1D, BLM18EG331TN1D, BLM18EG391TN1D), TDK Corporation (MMZ1608B301CTAH0, MMZ1608R301ATA00), TE Connectivity (BMC1JY0300AN), TAI-TECH (FCM 1608KF-301T05), and Shenzhen Sunlord (GZ1608D301CTF) all carry ROHS3 compliance certification. Cal-Chip Electronics FB160808T-331Y-S carries RoHS compliance. All parts maintain MSL 1 (Unlimited) moisture sensitivity rating, consistent with the primary part.

Exact Impedance Substitutes: BLM18AG331SN1D, BLM18EG331TN1D, and FB160808T-331Y-S provide 330 Ohms @ 100 MHz impedance matching, enabling direct circuit replacement. BLM18EG331TN1D offers reduced DCR (210mOhm) and lower profile height (0.026"), providing performance optimization opportunities. BLM18AG331SN1D offers moderate DCR reduction (300mOhm) while maintaining standard height profile.

Impedance Variation Substitutes: 300 Ohms impedance parts (GZ1608D301CTF, BMC1JY0300AN, FCM 1608KF-301T05, MMZ1608B301CTAH0, MMZ1608R301ATA00) operate within acceptable tolerance for signal line filtering. BMC1JY0300AN provides elevated current rating (600mA) and reduced DCR (200mOhm). MMZ1608B301CTAH0 and MMZ1608R301CTAH0 offer reduced height profiles (0.030" and 0.075mm respectively). The 390 Ohms option (BLM18EG391TN1D) provides higher impedance filtering for applications requiring increased attenuation.

Frequently Asked Questions (FAQ)

Q: Can BLM18EG331TN1D directly replace SZ1608G331CTF in existing designs?

A: Yes. BLM18EG331TN1D matches the 330 Ohms @ 100 MHz impedance specification and maintains 500mA current rating and -55°C to 125°C operating temperature range. The part features reduced DCR (210mOhm versus 700mOhm) and lower profile height (0.026" versus 0.037"), which may improve thermal performance and PCB space utilization. All mechanical and electrical parameters remain compatible with 0603 (1608 Metric) surface mount footprints.

Q: What is the difference between 300 Ohms and 330 Ohms impedance ferrite beads?

A: Impedance determines the frequency-dependent attenuation characteristics of the ferrite bead. The 330 Ohms specification provides higher impedance at 100 MHz compared to 300 Ohms variants. For signal line filtering applications, this 30 Ohms difference represents approximately 9% variation. Selection between these values depends on circuit-specific EMI filtering requirements and signal integrity margins. Both impedance values operate within the same current and temperature specifications.

Q: Are all substitute parts compatible with the same PCB footprint?

A: All listed substitute parts use the 0603 (1608 Metric) package with identical length (0.063" / 1.60mm) and width (0.031" to 0.032" / 0.80mm). Height variations exist: standard height is 0.037" (0.95mm), while some Murata and TDK variants offer reduced height at 0.026" to 0.030" (0.65mm to 0.75mm). Reduced-height variants fit within standard 0603 footprints and provide additional PCB clearance. Verify PCB design height constraints before selecting reduced-profile alternatives.

Q: Which substitute offers the lowest DC resistance?

A: BLM18EG331TN1D provides the lowest DCR at 210mOhm, compared to the primary part's 700mOhm specification. This 70% reduction in DC resistance decreases power dissipation and heat generation during operation. BMC1JY0300AN (200mOhm) and MMZ1608B301CTAH0 / MMZ1608R301ATA00 (250mOhm) offer comparable low-resistance performance. Lower DCR is beneficial in high-current applications where thermal management is critical.

Q: What is the significance of ROHS3 compliance versus RoHS compliance?

A: ROHS3 compliance indicates adherence to the Restriction of Hazardous Substances Directive 2011/65/EU as amended by Directive (EU) 2015/863, which includes restrictions on phthalates in addition to the original six restricted substances. RoHS compliance indicates adherence to the original directive. ROHS3 represents a more stringent environmental standard. Most substitute parts carry ROHS3 certification; FB160808T-331Y-S carries RoHS certification. Both certifications satisfy standard industrial procurement requirements.

Q: Can I use a 390 Ohms ferrite bead (BLM18EG391TN1D) instead of 330 Ohms?

A: BLM18EG391TN1D operates at 390 Ohms @ 100 MHz, representing an 18% impedance increase relative to the 330 Ohms specification. This higher impedance provides increased attenuation of high-frequency noise. Substitution is permissible in applications where increased filtering does not compromise signal integrity or introduce undesired phase shift. Circuit simulation or empirical testing may be necessary to confirm performance in noise-sensitive applications.

Q: What inventory levels are available for substitute parts?

A: Inventory availability varies significantly: FB160808T-331Y-S (100,945 units), BLM18EG331TN1D (28,200 units), BLM18EG391TN1D (10,309 units), BMC1JY0300AN (8,841 units), MMZ1608R301CTAH0 (8,619 units), GZ1608D301CTF (8,706 units), FCM 1608KF-301T05 (7,084 units), BLM18AG331SN1D (2,330 units), and MMZ1608B301CTAH0 (2,020 units). High-volume applications should prioritize parts with substantial inventory reserves to ensure supply continuity.

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