CMLB177T-6R8MS Equivalent & Substitute Parts

Part Overview

The CMLB177T-6R8MS is a fixed surface mount inductor manufactured by Delta Electronics/Cyntec, rated for 6.8 µH inductance with a 21 A current rating and 6.5 mΩ DC resistance. This component is actively produced and RoHS compliant, making it suitable for power conversion, filtering, and energy storage applications in industrial and commercial electronics. Substitute parts are identified to provide alternative sourcing options when the primary part is unavailable or when inventory constraints require component flexibility.

Substiute Parts

CMLB177T-6R8MS

Delta Electronics/CyntecIn Stock: 992CMLB177T-6R8MS Datasheet

Current PartRFQ

PA4344.682NLT

Pulse ElectronicsIn Stock: 1555PA4344.682NLT Datasheet

DirectRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitute parts for the CMLB177T-6R8MS are identified based on the following critical electrical and mechanical parameters:

• Inductance Value: 6.8 µH (exact match required)
• Current Rating: Minimum 19 A (substitute must support the application current demand)
• DC Resistance (DCR): Maximum 9.2 mΩ (acceptable variance within thermal and efficiency constraints)
• Packaging: Surface Mount, Tape & Reel format
• Compliance: RoHS and REACH compliance maintained
• Moisture Sensitivity: MSL 1 (Unlimited) for storage and handling compatibility

The PA4344.682NLT from Pulse Electronics meets these substitution criteria with equivalent inductance, higher current saturation capability (32 A), and acceptable DC resistance variance.

Parameter Comparison

Engineering Selection Recommendations

The PA4344.682NLT is a qualified substitute for the CMLB177T-6R8MS based on the following engineering criteria:

• Electrical Equivalence: Both components provide 6.8 µH inductance with compatible current handling characteristics. The substitute's 19 A rating is within acceptable range for applications designed for the 21 A primary part, provided circuit design margins are verified.
• Compliance Alignment: Both parts maintain RoHS and REACH compliance. The substitute carries AEC-Q200 automotive qualification, providing additional reliability assurance for demanding applications.
• Packaging Compatibility: Both components are supplied in Tape & Reel format with identical MSL 1 classification, ensuring compatible handling and storage requirements.
• DC Resistance Consideration: The substitute's 9.2 mΩ DCR is higher than the primary part's 6.5 mΩ. This 41% increase in resistance will result in proportionally higher power dissipation and should be evaluated in thermal budget calculations for high-current applications.

Frequently Asked Questions (FAQ)

Q: Can PA4344.682NLT be used as a direct replacement for CMLB177T-6R8MS?

A: Yes, for applications where the 19 A current rating of the substitute is sufficient. The 6.8 µH inductance is identical. However, the higher DC resistance (9.2 mΩ vs. 6.5 mΩ) requires thermal analysis to confirm acceptable power dissipation in your specific circuit.

Q: What is the impact of the higher DC resistance in the substitute part?

A: Higher DC resistance increases I²R losses. For a 20 A application, the primary part dissipates approximately 2.6 W, while the substitute dissipates approximately 3.68 W. Verify that your thermal design accommodates this additional heat generation.

Q: Are the packaging dimensions compatible?

A: Both parts use Surface Mount Tape & Reel packaging. The substitute (PA4344.682NLT) has dimensions of 17.70 mm × 17.20 mm × 7.00 mm (max height). Confirm PCB footprint compatibility with your design specifications.

Q: Do both parts have the same moisture sensitivity requirements?

A: Yes. Both components are classified as MSL 1 (Unlimited), requiring no special moisture control during storage or handling.

Q: What certifications does the substitute part carry?

A: The PA4344.682NLT carries AEC-Q200 automotive qualification, indicating compliance with automotive reliability standards. Both parts are RoHS3 and REACH compliant.