SC1608F-680 Equivalent & Substitute Parts

Part Overview

The SC1608F-680 is a 68 µH unshielded wirewound inductor manufactured by Signal Transformer, rated for 480 mA continuous current with a maximum DC resistance of 1.1 Ohm. This surface mount component operates across the industrial temperature range of -40°C to 125°C and is ROHS3 compliant. The part is currently active in production with 919 units in stock. Substitute parts are identified when equivalent electrical performance and mechanical compatibility can be maintained within the specified parameter tolerances for this inductance value and current rating category.

Substiute Parts

SC1608F-680

Signal TransformerIn Stock: 1004SC1608F-680 Datasheet

Current PartRFQ

LD1-680-R

Eaton - Electronics DivisionIn Stock: 1033LD1-680-R Datasheet

MFR RecommendedRFQ

Key Parameters

Substitute Part Grouping Explanation

The LD1-680-R from Eaton - Electronics Division qualifies as a direct substitute for the SC1608F-680 based on the following critical parameters:

• Inductance Value: Both parts are rated at 68 µH with ±20% tolerance, meeting the same inductance specification
• Current Rating: The LD1-680-R is rated for 460 mA, which falls within acceptable operating margins relative to the SC1608F-680's 480 mA rating for most circuit applications
• DC Resistance: The LD1-680-R maximum DCR of 1.12 Ohm is within 2% of the SC1608F-680's 1.1 Ohm specification
• Shielding Configuration: Both parts are unshielded wirewound inductors
• Mounting Type: Both are surface mount components
• Operating Temperature: Both operate across -40°C to 125°C
• Compliance: Both are RoHS compliant and have MSL rating of 1
• Inductance Test Frequency: Both are tested at 100 kHz

Parameter Comparison

Engineering Selection Recommendations

The LD1-680-R is an active production part with equivalent RoHS compliance and identical moisture sensitivity classification. The 4.2% reduction in current rating (460 mA vs 480 mA) is within acceptable substitution margins for most applications operating below the maximum rated current. The LD1-680-R exhibits superior saturation current performance at 520 mA compared to 400 mA, providing additional headroom in transient conditions. The ferrite drum core construction of the LD1-680-R versus the standard wirewound core of the SC1608F-680 results in negligible DCR variance (1.8%) while maintaining identical inductance and tolerance specifications. Both parts are currently in active production status with confirmed inventory availability.

Frequently Asked Questions (FAQ)

Q: Can the LD1-680-R replace the SC1608F-680 in existing designs?

A: Yes. Both parts meet the 68 µH inductance specification at ±20% tolerance, operate across identical temperature ranges, and maintain equivalent DC resistance characteristics within 1.8%. The 460 mA current rating of the LD1-680-R is suitable for applications where the SC1608F-680's 480 mA rating is not fully utilized.

Q: What is the significance of the saturation current difference?

A: The LD1-680-R saturation current of 520 mA exceeds the SC1608F-680's 400 mA specification. This indicates the LD1-680-R maintains inductance stability under higher transient current conditions, which is advantageous for circuit protection and performance margin.

Q: Are there packaging differences between these parts?

A: Both parts are surface mount components supplied in Tape & Reel packaging. Physical dimensions differ slightly due to core construction differences (SC1608F-680: 6.60mm × 4.45mm × 2.92mm; LD1-680-R: 4.50mm × 4.00mm × 3.20mm), requiring PCB layout verification before substitution.

Q: What compliance certifications apply to both parts?

A: Both parts are RoHS compliant with MSL rating of 1 (Unlimited moisture sensitivity). The SC1608F-680 carries ROHS3 certification while the LD1-680-R carries standard RoHS certification. Both are EAR99 classified for export purposes.

Q: Is the core material difference significant for circuit performance?

A: The LD1-680-R uses ferrite drum core construction versus the SC1608F-680's standard wirewound core. Both configurations deliver the specified 68 µH inductance at 100 kHz test frequency with equivalent tolerance. The ferrite core provides improved saturation performance without affecting the primary inductance specification.