SC3DF-100 Equivalent & Substitute Parts

Part Overview

The SC3DF-100 is a 10 µH unshielded wirewound surface mount inductor manufactured by Signal Transformer, rated for 1.1 A continuous current with a maximum DC resistance of 330 mOhm. This component is classified as obsolete, making equivalent substitute parts necessary for new designs and ongoing production requirements. The part operates across an industrial temperature range of -40°C to 125°C and complies with RoHS3 and REACH standards.

Substiute Parts

SC3DF-100

Signal TransformerIn Stock: 1148SC3DF-100 Datasheet

Current PartRFQ

UP0.4C-100-R

Eaton - Electronics DivisionIn Stock: 8723UP0.4C-100-R Datasheet

MFR RecommendedRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution of the SC3DF-100 is based on the following critical electrical and mechanical parameters:

• Inductance Value: Must be 10 µH at 100 kHz test frequency with ±20% tolerance
• Current Rating: Minimum 1.1 A continuous current capability
• DC Resistance: Must not exceed 330 mOhm to maintain circuit performance
• Saturation Current: Must support at least 630 mA without saturation effects
• Mounting Configuration: Surface mount, nonstandard package with compatible footprint dimensions (6.50 mm L × 4.40 mm W)
• Operating Temperature: Must support -40°C to 125°C range or equivalent
• Shielding: Unshielded configuration
• Compliance: RoHS and REACH compliance required for modern supply chains

The substitute part UP0.4C-100-R from Eaton - Electronics Division meets these substitution criteria with equivalent electrical performance and improved DC resistance characteristics.

Parameter Comparison

Engineering Selection Recommendations

The UP0.4C-100-R from Eaton - Electronics Division is the qualified substitute for the obsolete SC3DF-100. Selection is based on the following engineering criteria:

Electrical Equivalence: Both parts deliver 10 µH inductance at 100 kHz with identical ±20% tolerance. The UP0.4C-100-R provides superior electrical performance with 156 mOhm maximum DC resistance compared to 330 mOhm, resulting in lower power dissipation and improved efficiency in the circuit.

Current Handling: The UP0.4C-100-R is rated for 1.16 A continuous current and 1.16 A saturation current, exceeding the SC3DF-100 specifications of 1.1 A and 630 mA respectively. This provides additional design margin.

Mechanical Compatibility: Physical dimensions are within acceptable tolerance for PCB footprint compatibility. The UP0.4C-100-R measures 6.60 × 4.45 × 2.92 mm compared to 6.50 × 4.40 × 3.10 mm, with minimal variation suitable for surface mount assembly.

Compliance and Availability: The UP0.4C-100-R is RoHS compliant and currently in active production with 8681 pieces in stock, ensuring long-term supply chain stability. The SC3DF-100 is obsolete with limited remaining inventory.

Temperature Consideration: The UP0.4C-100-R operates to 85°C maximum, which is lower than the SC3DF-100 specification of 125°C. Applications requiring operation above 85°C require thermal analysis or alternative component selection.

Frequently Asked Questions (FAQ)

Q: Can the UP0.4C-100-R directly replace the SC3DF-100 in existing designs?

A: Yes, for applications operating within -40°C to 85°C. The UP0.4C-100-R meets or exceeds all critical electrical parameters: inductance value, current rating, and DC resistance. Physical dimensions are compatible with standard surface mount assembly processes. Applications requiring operation above 85°C require design review.

Q: What is the impact of the lower DC resistance in the UP0.4C-100-R?

A: Lower DC resistance (156 mOhm vs. 330 mOhm) reduces resistive losses and heat generation in the inductor. This improves circuit efficiency and reduces thermal stress on the component and surrounding circuitry. No negative impact on circuit function.

Q: Are the physical dimensions compatible for PCB layout?

A: Yes. The UP0.4C-100-R dimensions (6.60 × 4.45 × 2.92 mm) are within acceptable tolerance of the SC3DF-100 (6.50 × 4.40 × 3.10 mm). Standard surface mount assembly equipment accommodates this variation. Verify footprint clearance for height-sensitive applications.

Q: What is the difference between the core materials?

A: The SC3DF-100 uses an unspecified core material, while the UP0.4C-100-R uses a ferrite drum core. Both are unshielded wirewound inductors with identical electrical specifications at 100 kHz test frequency. Ferrite core construction in the UP0.4C-100-R contributes to improved DC resistance performance.

Q: Is the packaging format compatible?

A: Both parts use nonstandard surface mount packages. The SC3DF-100 is supplied as individual units, while the UP0.4C-100-R is available in Tape & Reel (TR) format for automated assembly. Reel format is standard for production environments and does not affect component compatibility.

Q: What compliance certifications apply to both parts?

A: The SC3DF-100 is RoHS3 compliant and REACH unaffected. The UP0.4C-100-R is RoHS compliant and carries the same REACH status. Both parts meet modern environmental and regulatory requirements for electronics manufacturing.

Q: What is the moisture sensitivity level (MSL) for these inductors?

A: Both parts carry MSL 1 (Unlimited) rating, indicating no moisture sensitivity. These components do not require special moisture control during storage, handling, or assembly.