BK1005LL241-TV Ferrite Bead Equivalent & Substitute Parts

Part Overview

The BK1005LL241-TV is a ferrite bead manufactured by Taiyo Yuden, rated at 240 Ohms impedance at 100 MHz in a 0402 (1005 Metric) surface mount package. This component is classified as obsolete, necessitating identification of active equivalent and substitute parts for ongoing design requirements and production continuity. The ferrite bead functions as an electromagnetic interference (EMI) suppression element for single-line signal applications, with a maximum current rating of 250 mA and DC resistance of 700 mOhm.

Key Parameters

Parameter	Value
Impedance @ 100 MHz	240 Ohms
Package / Case	0402 (1005 Metric)
Current Rating (Max)	250 mA
DC Resistance (Max)	700 mOhm
Number of Lines	1
Operating Temperature Range	-55°C ~ 125°C
Mounting Type	Surface Mount
Height (Max)	0.022" (0.55 mm)
Size / Dimension	0.039" L x 0.020" W (1.00 mm x 0.50 mm)
RoHS Status	ROHS3 Compliant
Moisture Sensitivity Level (MSL)	1 (Unlimited)
Ratings	AEC-Q200

Substitute Part Grouping Explanation

Substitution of the BK1005LL241-TV is determined by strict adherence to the following electrical and mechanical parameters:

Primary Substitution Criteria:

Impedance at 100 MHz: 240 Ohms (exact match) or 220 Ohms (acceptable variance within ferrite bead tolerance)
Package / Case: 0402 (1005 Metric) surface mount only
Number of Lines: Single line (1 LN)
Operating Temperature Range: -55°C ~ 125°C minimum
Ratings: AEC-Q200 compliance required
RoHS Status: ROHS3 Compliant

Secondary Compatibility Parameters:

Current Rating: Substitute must equal or exceed 250 mA
DC Resistance: Substitute must not exceed 700 mOhm significantly
Height and dimensional constraints: Must fit within 0.022" (0.55 mm) maximum height
Moisture Sensitivity Level: MSL 1 (Unlimited) preferred

Substitutes are grouped into two impedance categories: 240 Ohm exact matches and 220 Ohm near-equivalents. Within each category, parts are differentiated by current rating capacity and DC resistance characteristics.

Parameter Comparison

Manufacturer Part Number	Manufacturer	Impedance @ 100 MHz	Current Rating (Max)	DC Resistance (Max)	Product Status	Height (Max)	AEC-Q200
BK1005LL241-TV	Taiyo Yuden	240 Ohms	250 mA	700 mOhm	Obsolete	0.022" (0.55 mm)	Yes
782422241	Würth Elektronik	240 Ohms	300 mA	350 mOhm	Active	0.022" (0.55 mm)	Yes
MMZ1005S241CTD25	TDK Corporation	240 Ohms	400 mA	280 mOhm	Active	0.022" (0.55 mm)	Yes
MMZ1005Y241CTD25	TDK Corporation	240 Ohms	300 mA	260 mOhm	Active	0.022" (0.55 mm)	Yes
782422221	Würth Elektronik	220 Ohms	400 mA	300 mOhm	Active	0.022" (0.55 mm)	Yes
782422231	Würth Elektronik	220 Ohms	300 mA	350 mOhm	Active	0.022" (0.55 mm)	Yes
ABSJ00100505221Y00	Pulse Electronics	220 Ohms	400 mA	400 mOhm	Active	0.024" (0.60 mm)	Yes
BLM15BD221SZ1D	Murata Electronics	220 Ohms	300 mA	400 mOhm	Active	0.022" (0.55 mm)	Yes
BLM15GG221SZ1D	Murata Electronics	220 Ohms	300 mA	700 mOhm	Active	0.022" (0.55 mm)	Yes

Engineering Selection Recommendations

Primary Substitutes (240 Ohm Exact Match):

The following parts provide direct electrical equivalence to the BK1005LL241-TV with identical impedance at 100 MHz and are recommended as first-choice replacements:

MMZ1005S241CTD25 (TDK Corporation): Active product status with superior current rating (400 mA) and lowest DC resistance (280 mOhm). Provides enhanced performance margin over the original specification.
MMZ1005Y241CTD25 (TDK Corporation): Active product status with 300 mA current rating and 260 mOhm DC resistance. Suitable for applications with moderate current requirements.
782422241 (Würth Elektronik): Active product status with 300 mA current rating and 350 mOhm DC resistance. Meets all dimensional and compliance requirements.

Secondary Substitutes (220 Ohm Near-Equivalent):

The following parts operate at 220 Ohms impedance, representing a 8.3% reduction from the original 240 Ohm specification. These are acceptable substitutes where impedance tolerance permits:

782422221 (Würth Elektronik): Active product status with highest current rating (400 mA) and lowest DC resistance (300 mOhm) among 220 Ohm options.
BLM15BD221SZ1D (Murata Electronics): Active product status with automotive-grade qualification and 300 mA current rating.
BLM15GG221SZ1D (Murata Electronics): Active product status with automotive-grade qualification and DC resistance matching the original part (700 mOhm).

Dimensional Consideration:

ABSJ00100505221Y00 (Pulse Electronics) has a maximum height of 0.024" (0.60 mm), exceeding the 0.022" (0.55 mm) specification of the original part. This substitute is suitable only for applications with relaxed height constraints.

All recommended substitutes maintain AEC-Q200 compliance, ROHS3 compliance, and MSL 1 rating, ensuring compatibility with automotive and industrial applications.

Frequently Asked Questions (FAQ)

Q: Can I use a 220 Ohm ferrite bead as a substitute for the 240 Ohm BK1005LL241-TV?

A: Yes, 220 Ohm ferrite beads are acceptable substitutes where circuit design permits an 8.3% impedance reduction. The electrical performance difference is within typical ferrite bead tolerance ranges. Verify that your application's EMI suppression requirements are met at the lower impedance value.

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 direct current. Lower DCR values reduce signal attenuation and power dissipation. The original BK1005LL241-TV specifies 700 mOhm maximum. Most active substitutes offer superior DCR performance (260–400 mOhm), providing improved signal integrity.

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

A: All recommended substitutes use 0402 (1005 Metric) surface mount packages with identical footprints. However, ABSJ00100505221Y00 has a maximum height of 0.024" (0.60 mm) compared to 0.022" (0.55 mm) for other parts. Verify PCB assembly clearance if height is constrained.

Q: What does AEC-Q200 compliance mean for ferrite bead selection?

A: AEC-Q200 is an automotive electronics qualification standard. All recommended substitutes carry this certification, ensuring reliability for automotive and high-reliability applications. This certification is maintained across all substitute options.

Q: Why do some substitutes have higher current ratings than the original part?

A: The BK1005LL241-TV is rated for 250 mA maximum current. Substitute parts with 300 mA or 400 mA ratings provide additional design margin and thermal headroom. These higher ratings do not affect compatibility; they simply indicate enhanced capability for higher-current applications.

Q: Is the BK1005LL241-TV still available for purchase?

A: The BK1005LL241-TV is classified as obsolete. Active substitutes from Würth Elektronik, TDK Corporation, Murata Electronics, and Pulse Electronics are currently in production and available in commercial quantities.

Q: What is Moisture Sensitivity Level (MSL) 1, and why is it important?

A: MSL 1 indicates unlimited shelf life without moisture baking requirements. All recommended substitutes maintain MSL 1 rating, eliminating special storage or handling procedures and simplifying supply chain management.

Q: Can I mix different substitute part numbers in the same production run?

A: Yes, all recommended substitutes meet identical electrical specifications and package requirements. However, standard manufacturing practice recommends using a single part number per production batch to maintain consistency and simplify traceability.

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