BK1608LL241-T Ferrite Bead Equivalent & Substitute Parts

Part Overview

The BK1608LL241-T is a 240 Ohm ferrite bead manufactured by Taiyo Yuden, designed for single-line signal filtering in 0603 (1608 Metric) surface mount applications. This component operates at 100 MHz impedance with a maximum current rating of 250 mA and 800 mOhm DC resistance. The part is classified as obsolete, necessitating identification of active equivalent and substitute components that maintain functional compatibility within specified electrical and mechanical parameters.

Key Parameters

Parameter	Value
Impedance @ 100 MHz	240 Ohms
Current Rating (Maximum)	250 mA
DC Resistance (Maximum)	800 mOhm
Package / Case	0603 (1608 Metric)
Mounting Type	Surface Mount
Operating Temperature Range	-55°C to 125°C
Number of Lines	1
RoHS Status	ROHS3 Compliant
Moisture Sensitivity Level	1 (Unlimited)

Substitute Part Grouping Explanation

Substitution of the BK1608LL241-T is determined by the following critical parameters:

Primary Matching Criteria:

Impedance at 100 MHz: 240 Ohms (exact match) or 220 Ohms (near-equivalent)
Package / Case: 0603 (1608 Metric) surface mount
Operating Temperature Range: -55°C to 125°C
Number of Lines: 1 (single-line configuration)
RoHS3 Compliance and MSL 1 rating

Secondary Compatibility Factors:

Current Rating: Substitute must equal or exceed 250 mA
DC Resistance: Substitute with lower DCR provides improved performance
Product Status: Active status ensures ongoing availability

Substitute parts are grouped into two categories: exact impedance matches (240 Ohms) and near-equivalent impedance matches (220 Ohms). Both categories maintain identical package dimensions, temperature ratings, and compliance certifications. Parts with 200 Ohm impedance are included as lower-impedance alternatives where application requirements permit.

Parameter Comparison

Manufacturer Part Number	Manufacturer	Impedance @ 100 MHz	Current Rating (Max)	DC Resistance (Max)	Product Status	Package / Case	Height (Max)
BK1608LL241-T	Taiyo Yuden	240 Ohms	250 mA	800 mOhm	Obsolete	0603 (1608 Metric)	0.037" (0.95 mm)
BBNQ00160808241Y00	Pulse Electronics	240 Ohms	400 mA	350 mOhm	Active	0603 (1608 Metric)	0.037" (0.95 mm)
74279263	Würth Elektronik	220 Ohms	500 mA	300 mOhm	Active	0603 (1608 Metric)	0.039" (1.00 mm)
ACML-0603-221-T	Abracon LLC	220 Ohms	500 mA	450 mOhm	Active	0603 (1608 Metric)	0.037" (0.95 mm)
BBBK00160808221Y00	Pulse Electronics	220 Ohms	300 mA	300 mOhm	Active	0603 (1608 Metric)	0.037" (0.95 mm)
BBGK00160808201Y00	Pulse Electronics	200 Ohms	400 mA	180 mOhm	Active	0603 (1608 Metric)	0.037" (0.95 mm)
BBSJ00160808221Y00	Pulse Electronics	220 Ohms	400 mA	300 mOhm	Active	0603 (1608 Metric)	0.037" (0.95 mm)
BLM18AG221SN1D	Murata Electronics	220 Ohms	500 mA	250 mOhm	Active	0603 (1608 Metric)	0.037" (0.95 mm)
BLM18BB221SN1D	Murata Electronics	220 Ohms	450 mA	450 mOhm	Active	0603 (1608 Metric)	0.037" (0.95 mm)
BMC1JY0200AN	TE Connectivity Passive Product	200 Ohms	400 mA	200 mOhm	Active	0603 (1608 Metric)	0.037" (0.95 mm)
BMC1JY0220AN	TE Connectivity Passive Product	220 Ohms	400 mA	200 mOhm	Active	0603 (1608 Metric)	0.037" (0.95 mm)

Engineering Selection Recommendations

Exact Impedance Match (240 Ohms):

The BBNQ00160808241Y00 from Pulse Electronics provides an exact 240 Ohm impedance match at 100 MHz. This part maintains active product status, ROHS3 compliance, and MSL 1 rating. The current rating of 400 mA exceeds the original 250 mA specification, and the DC resistance of 350 mOhm is significantly lower than the original 800 mOhm, resulting in improved thermal performance. Package dimensions and operating temperature range are identical to the BK1608LL241-T.

Near-Equivalent Impedance Matches (220 Ohms):

Multiple active alternatives with 220 Ohm impedance at 100 MHz are available from established manufacturers including Würth Elektronik (74279263), Abracon LLC (ACML-0603-221-T), Pulse Electronics (BBBK00160808221Y00, BBSJ00160808221Y00), Murata Electronics (BLM18AG221SN1D, BLM18BB221SN1D), and TE Connectivity (BMC1JY0220AN). All maintain 0603 package compatibility, -55°C to 125°C operating range, ROHS3 compliance, and MSL 1 rating. Current ratings range from 300 mA to 500 mA, all exceeding the original 250 mA requirement. DC resistance values range from 200 mOhm to 450 mOhm.

Lower Impedance Alternatives (200 Ohms):

The BBGK00160808201Y00 and BMC1JY0200AN provide 200 Ohm impedance options with 400 mA current ratings and superior DC resistance characteristics (180 mOhm and 200 mOhm respectively). These parts are suitable for applications where lower impedance filtering is acceptable.

All recommended substitutes maintain full compliance with RoHS3 regulations and MSL 1 moisture sensitivity specifications, ensuring compatibility with standard PCB assembly and storage protocols.

Frequently Asked Questions (FAQ)

Q: Can the BBNQ00160808241Y00 directly replace the BK1608LL241-T?

A: Yes. The BBNQ00160808241Y00 provides an exact 240 Ohm impedance match at 100 MHz in an identical 0603 (1608 Metric) surface mount package. Operating temperature range, RoHS3 compliance, and MSL 1 rating are identical. The higher current rating (400 mA vs. 250 mA) and lower DC resistance (350 mOhm vs. 800 mOhm) represent performance improvements.

Q: What is the difference between 240 Ohm and 220 Ohm ferrite beads in this application?

A: The impedance difference of 20 Ohms at 100 MHz represents approximately an 8% reduction in filtering impedance. For most signal line filtering applications, this difference is within acceptable tolerance. Selection between these impedance values depends on specific circuit requirements and frequency response characteristics of the target application.

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

A: All listed substitutes are available in 0603 (1608 Metric) surface mount packages with identical footprints. Height specifications are consistent at 0.037" (0.95 mm) for most parts, with the Würth Elektronik 74279263 at 0.039" (1.00 mm). This minor height variation does not affect PCB assembly compatibility.

Q: What does MSL 1 rating mean for component handling?

A: MSL 1 (Moisture Sensitivity Level 1) indicates unlimited shelf life without moisture exposure controls. These components do not require special desiccant storage or baking procedures prior to assembly, simplifying inventory management and reducing handling costs.

Q: Why do substitute parts have lower DC resistance than the original BK1608LL241-T?

A: Lower DC resistance (200-450 mOhm vs. 800 mOhm) in substitute parts reflects improved ferrite material formulations and manufacturing processes. Lower DCR reduces heat generation during operation, improving component reliability and circuit efficiency without affecting the primary 100 MHz impedance filtering function.

Q: Are all substitute parts ROHS3 compliant?

A: Yes. All listed substitute parts carry ROHS3 compliance certification, ensuring compatibility with current environmental regulations and manufacturing standards across all major markets.

Q: What is the significance of "Active" product status for substitutes?

A: Active product status indicates ongoing manufacturing and availability from the component manufacturer. This ensures long-term supply chain reliability and eliminates the obsolescence risk associated with the original BK1608LL241-T.

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