SC3DF-101 Equivalent & Substitute Parts

Part Overview

The SC3DF-101 is a 100 µH unshielded wirewound surface mount inductor manufactured by Signal Transformer, rated for 400 mA with a maximum DC resistance of 2.64Ohm. This component is classified as obsolete, making identification of functionally equivalent alternatives necessary for ongoing design support and procurement continuity. The part operates across an industrial temperature range of -40°C to 125°C and meets ROHS3 compliance requirements.

Substiute Parts

SC3DF-101

Signal TransformerIn Stock: 904SC3DF-101 Datasheet

Current PartRFQ

UP0.4C-101-R

Eaton - Electronics DivisionIn Stock: 1106UP0.4C-101-R Datasheet

MFR RecommendedRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution of the SC3DF-101 is determined by strict equivalence across the following electrical and mechanical parameters:

• Inductance value: 100 µH at 100 kHz test frequency
• Inductance tolerance: ±20%
• Current rating: minimum 400 mA
• Saturation current: minimum 210 mA
• DC resistance: maximum 2.64Ohm
• Shielding configuration: unshielded
• Mounting type: surface mount
• Operating temperature range: minimum -40°C to 125°C coverage
• RoHS compliance status

The substitute part UP0.4C-101-R meets these criteria with equivalent inductance and tolerance specifications. While the current rating (370 mA) and saturation current (350 mA) of the substitute exceed the minimum requirements, and the DC resistance (1.58Ohm Max) is lower than the maximum allowed, these represent improvements in performance characteristics. The substitute operates within a narrower temperature range (-40°C to 85°C), which covers the lower portion of the original specification but does not extend to 125°C.

Parameter Comparison

Engineering Selection Recommendations

The UP0.4C-101-R is an active production substitute for the obsolete SC3DF-101. Both components maintain identical inductance specifications (100 µH ±20%) and are tested at 100 kHz. The substitute offers improved electrical performance with lower DC resistance (1.58Ohm versus 2.64Ohm maximum) and higher saturation current (350 mA versus 210 mA), resulting in reduced power dissipation and enhanced current handling capability.

Physical dimensions are compatible within typical PCB layout tolerances, with the substitute measuring 0.260" L x 0.175" W compared to 0.256" L x 0.173" W, and seated height of 0.115" versus 0.122". Both components are RoHS compliant and carry MSL 1 moisture sensitivity classification.

The primary design consideration is the operating temperature range. The SC3DF-101 supports -40°C to 125°C operation, while the UP0.4C-101-R is rated to -40°C to 85°C. Applications requiring sustained operation above 85°C require thermal analysis to confirm the substitute's suitability.

Frequently Asked Questions (FAQ)

Q: Can UP0.4C-101-R directly replace SC3DF-101 in all applications?

A: The UP0.4C-101-R meets the core electrical requirements (100 µH inductance, 400 mA current capability, unshielded configuration, surface mount package). However, the operating temperature range differs. If your application operates continuously above 85°C, thermal performance must be verified before substitution.

Q: What is the significance of the lower DC resistance in the substitute part?

A: The UP0.4C-101-R exhibits 1.58Ohm maximum DC resistance compared to 2.64Ohm maximum in the SC3DF-101. Lower DC resistance reduces I²R power losses in the inductor, resulting in lower operating temperature and improved efficiency. This is a performance advantage for most applications.

Q: Are the physical dimensions compatible with existing PCB layouts?

A: The substitute dimensions (6.60mm L x 4.45mm W x 2.92mm H) are within 0.1mm of the original part (6.50mm L x 4.40mm W x 3.10mm H). Standard PCB design tolerances accommodate this variation. Verify footprint clearances for your specific layout.

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

A: Both are wirewound inductors. The SC3DF-101 uses standard wirewound construction with unspecified core material. The UP0.4C-101-R uses drum core construction with ferrite material, which provides improved saturation characteristics and lower DC resistance while maintaining the same inductance value.

Q: Do both parts meet the same compliance standards?

A: Both components are RoHS compliant and carry EAR99 ECCN classification. The SC3DF-101 is ROHS3 compliant, while the UP0.4C-101-R is RoHS compliant. Both maintain MSL 1 moisture sensitivity level. Verify specific compliance requirements for your application and region.