HM66-50680LFTR13 Equivalent & Substitute Parts

Part Overview

The HM66-50680LFTR13 is a 68 µH shielded wirewound inductor manufactured by TT Electronics/BI Magnetics, rated for 520 mA continuous current with a maximum DC resistance of 355 mOhm. This surface mount component operates across the temperature range of -40°C to 125°C and is housed in a nonstandard 5.70mm × 5.70mm package with a seated height of 3.00mm.

The HM66-50680LFTR13 is discontinued at DiGi Electronics. Identifying equivalent substitute parts is necessary to maintain design continuity and ensure component availability for production and repair applications. Substitute components must maintain electrical performance within acceptable tolerances while meeting mechanical and thermal requirements.

Substiute Parts

HM66-50680LFTR13

TT Electronics/BI MagneticsIn Stock: 4851HM66-50680LFTR13 Datasheet

Current PartRFQ

SRR5028-680Y

Bourns Inc.In Stock: 1197SRR5028-680Y Datasheet

SimilarRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution of the HM66-50680LFTR13 is determined by the following critical parameters:

Electrical Compatibility:

• Inductance value of 68 µH (tolerance range acceptable within design margins)
• Current rating equal to or greater than 520 mA
• DC resistance at or below 355 mOhm maximum
• Shielded construction to maintain electromagnetic isolation

Mechanical Compatibility:

• Surface mount technology
• Package footprint compatible with 5.70mm × 5.70mm dimensions
• Seated height of 3.00mm maximum
• Nonstandard package classification

Environmental Compatibility:

• Operating temperature range of -40°C to 125°C
• Moisture sensitivity level of 1 (unlimited)

The SRR5028-680Y from Bourns Inc. meets these substitution criteria and is classified as an equivalent alternative.

Parameter Comparison

Engineering Selection Recommendations

The SRR5028-680Y is a suitable equivalent substitute for the HM66-50680LFTR13 based on the following factors:

Electrical Performance: The substitute part maintains the 68 µH inductance specification with a wider tolerance of ±30% compared to the original ±20%. The current rating of 620 mA exceeds the original 520 mA requirement, providing operational margin. The DC resistance of 350 mOhm is lower than the original 355 mOhm maximum, resulting in improved performance characteristics.

Mechanical Compatibility: Both components utilize surface mount technology with identical seated heights of 3.00mm. The substitute package dimensions of 5.80mm × 5.80mm are marginally larger than the original 5.70mm × 5.70mm footprint. PCB layout verification is required to confirm that the 0.10mm increase in length and width does not create placement conflicts.

Environmental and Compliance Status: The SRR5028-680Y is actively available from Bourns Inc., addressing the discontinuation of the original part. Both components operate across the identical temperature range of -40°C to 125°C and maintain MSL 1 (unlimited) moisture sensitivity ratings. The substitute is ROHS3 compliant, ensuring regulatory alignment with current manufacturing standards.

Packaging Consideration: The original part is supplied in Cut Tape (CT) format, while the substitute is supplied in Tape & Reel (TR) format. Procurement and handling procedures must accommodate this packaging difference.

Frequently Asked Questions (FAQ)

Q: Can the SRR5028-680Y directly replace the HM66-50680LFTR13 without circuit modifications?

A: The SRR5028-680Y is electrically compatible with the HM66-50680LFTR13 for applications where the inductance value of 68 µH and current rating of 520 mA are required. The substitute's higher current rating (620 mA) and lower DC resistance (350 mOhm) provide equivalent or improved performance. PCB layout must accommodate the marginally larger package dimensions (5.80mm × 5.80mm versus 5.70mm × 5.70mm).

Q: What is the significance of the inductance tolerance difference between ±20% and ±30%?

A: The original HM66-50680LFTR13 specifies ±20% inductance tolerance, while the SRR5028-680Y specifies ±30%. This wider tolerance on the substitute part means the actual inductance value may deviate further from the nominal 68 µH. Circuit designs with tight inductance requirements must evaluate whether the ±30% tolerance remains acceptable for the intended application.

Q: Are there any thermal performance differences between these components?

A: Both components operate across the identical temperature range of -40°C to 125°C. The SRR5028-680Y provides saturation current data (560 mA), which is not specified for the original part. This additional specification indicates the current level at which the inductor's inductance begins to degrade due to core saturation.

Q: How do the packaging formats affect component procurement and assembly?

A: The HM66-50680LFTR13 is supplied in Cut Tape (CT) format, while the SRR5028-680Y is supplied in Tape & Reel (TR) format. Cut tape is typically used for smaller quantities and manual assembly, while tape and reel is standard for automated pick-and-place assembly. Procurement specifications and assembly equipment compatibility must be verified before substitution.

Q: Is the 0.10mm increase in package dimensions a concern for PCB layout?

A: The SRR5028-680Y package dimensions of 5.80mm × 5.80mm are 0.10mm larger in both length and width compared to the original 5.70mm × 5.70mm. For most PCB designs with standard component spacing, this difference is negligible. However, designs with tight component placement or minimal clearances must verify that the substitute component does not create mechanical interference or violate design rules.

Q: What is the difference between shielded wirewound and drum core construction?

A: The HM66-50680LFTR13 is specified as a shielded wirewound inductor, while the SRR5028-680Y is specified as a shielded drum core wirewound inductor. Both constructions provide electromagnetic shielding to minimize coupling to adjacent circuit elements. The drum core design in the substitute may offer different frequency response characteristics, though both components are tested at different frequencies (10 kHz for the original, 100 kHz for the substitute).

Q: Are there any compliance or regulatory differences between these parts?

A: The SRR5028-680Y is ROHS3 compliant, ensuring compliance with current environmental regulations. Both components are REACH unaffected and classified under ECCN EAR99. The substitute's active product status ensures ongoing availability and support from the manufacturer.