BK1608LL681-T Ferrite Bead Equivalent & Substitute Parts

Part Overview

The BK1608LL681-T is a 680 Ohm ferrite bead manufactured by Taiyo Yuden, designed for electromagnetic interference (EMI) suppression in surface mount applications. This component operates at 100 MHz with a maximum current rating of 150mA and is housed in a 0603 (1608 Metric) package. The part is classified as obsolete, necessitating identification of active equivalent alternatives that maintain functional compatibility within specified electrical and mechanical parameters.

Substiute Parts

BK1608LL681-T

Taiyo YudenIn Stock: 8276BK1608LL681-T Datasheet

Current PartRFQ

BLM18HG601SN1D

Murata ElectronicsIn Stock: 41443BLM18HG601SN1D Datasheet

Parametric EquivalentRFQ

HZ1608U601TF

Shenzhen Sunlord Electronics Co., Ltd.In Stock: 5260HZ1608U601TF Datasheet

Parametric EquivalentRFQ

PZ0603D601-R25TF

Shenzhen Sunlord Electronics Co., Ltd.In Stock: 2150PZ0603D601-R25TF Datasheet

Parametric EquivalentRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution of the BK1608LL681-T is determined by strict adherence to the following electrical and mechanical parameters:

Critical Matching Parameters:

• Package / Case: 0603 (1608 Metric) surface mount configuration
• Number of Lines: Single line ferrite bead
• Operating Temperature Range: -55°C to 125°C minimum
• DC Resistance (Maximum): 1 Ohm
• Moisture Sensitivity Level: 1 (Unlimited)
• RoHS3 Compliance

Impedance Tolerance: Substitute parts operate at 600 Ohms @ 100 MHz, representing a 11.8% reduction from the original 680 Ohms specification. This variance falls within acceptable substitution parameters for ferrite bead applications where impedance matching is not critical to circuit function.

Current Rating Enhancement: All substitute parts feature current ratings equal to or exceeding the original 150mA specification, providing equivalent or improved thermal performance characteristics.

Parameter Comparison

Engineering Selection Recommendations

BLM18HG601SN1D (Murata Electronics)

This substitute provides direct dimensional and electrical compatibility with the original BK1608LL681-T. The part maintains identical package dimensions (0603 / 1608 Metric), operating temperature range, and moisture sensitivity classification. Current rating enhancement to 200mA provides improved thermal margin. Active product status ensures long-term availability and supply chain continuity. ROHS3 compliance and REACH unaffected status confirm regulatory alignment. Packaging in Cut Tape and Digi-Reel formats supports both manual and automated assembly operations.

HZ1608U601TF (Shenzhen Sunlord Electronics)

This substitute maintains full dimensional compatibility and electrical parameter alignment with the original part. The 200mA current rating exceeds original specifications. Active product status guarantees ongoing availability. Tape & Reel packaging supports high-volume automated assembly. This option provides cost-effective substitution with equivalent performance characteristics.

PZ0603D601-R25TF (Shenzhen Sunlord Electronics)

This substitute is designated as a power line ferrite bead with the highest current rating (250mA) among available alternatives. The part maintains all critical electrical parameters and operating temperature specifications. The 0201 (0603 Metric) package designation indicates a smaller footprint compared to standard 0603 components, suitable for space-constrained applications. Active product status ensures supply availability. This option is appropriate for applications requiring enhanced current handling capacity.

Frequently Asked Questions (FAQ)

Q: Why does the substitute part have 600 Ohms impedance instead of 680 Ohms?

A: Ferrite bead impedance specifications in this category allow for substitution within established tolerance bands. The 600 Ohm rating represents an 11.8% variance from the original 680 Ohm specification and remains functionally equivalent for EMI suppression applications where precise impedance matching is not a circuit-critical requirement.

Q: Are all substitute parts compatible with the original PCB layout?

A: The BLM18HG601SN1D and HZ1608U601TF maintain identical 0603 (1608 Metric) package dimensions and height specifications (0.037" / 0.95mm maximum), ensuring direct PCB footprint compatibility. The PZ0603D601-R25TF uses a 0201 (0603 Metric) package with smaller footprint dimensions (0.024" L x 0.012" W), requiring PCB layout verification before implementation.

Q: What is the significance of the higher current ratings in substitute parts?

A: Substitute parts rated at 200mA and 250mA provide enhanced thermal performance margins compared to the original 150mA specification. Higher current ratings indicate improved thermal stability and reduced self-heating effects during operation, extending component lifespan and improving circuit reliability.

Q: Are there any compliance differences between substitute options?

A: The BLM18HG601SN1D explicitly confirms ROHS3 compliance and REACH unaffected status. The HZ1608U601TF and PZ0603D601-R25TF do not specify RoHS status in provided documentation. All parts maintain MSL 1 (Unlimited) moisture sensitivity classification and EAR99 export control designation.

Q: Which substitute part should be selected for new designs?

A: Selection depends on specific application requirements. For direct replacement with maximum supply availability, the BLM18HG601SN1D (Murata) is recommended due to explicit ROHS3 compliance confirmation and active product status. For space-constrained applications, the PZ0603D601-R25TF offers superior current handling in a smaller footprint. The HZ1608U601TF provides cost-effective equivalence with active status.

Q: What is the difference between Cut Tape and Tape & Reel packaging?

A: Cut Tape (CT) and Digi-Reel packaging (BLM18HG601SN1D) supports both manual component selection and automated pick-and-place assembly. Tape & Reel (TR) packaging (HZ1608U601TF and PZ0603D601-R25TF) is optimized for high-volume automated assembly operations with continuous component feeding.