SC3DM-102 Equivalent & Substitute Parts

Part Overview

The SC3DM-102 is a 1 mH shielded inductor manufactured by Signal Transformer, rated for 270 mA maximum current with 3.4Ohm DC resistance. This component is classified as obsolete, making equivalent substitutes necessary for ongoing design support and procurement. The part operates across the industrial temperature range of -40°C to 125°C and meets ROHS3 compliance requirements.

Substiute Parts

SC3DM-102

Signal TransformerIn Stock: 1070SC3DM-102 Datasheet

Current PartRFQ

SRR6603-102ML

Bourns Inc.In Stock: 6975SRR6603-102ML Datasheet

MFR RecommendedRFQ

Key Parameters

Substitute Part Grouping Explanation

The SRR6603-102ML from Bourns Inc. qualifies as a substitute based on the following critical parameters:

• Inductance Match: Both parts specify 1 mH at 100 kHz test frequency
• DC Resistance Match: Both maintain 3.4Ohm maximum DCR
• Shielding Configuration: Both are shielded designs
• Mounting Compatibility: Both are surface mount components with nonstandard packages
• Physical Dimensions: Package footprints are equivalent (6.50mm vs 6.60mm length, 4.40mm width, 3.10mm vs 3.00mm height)
• Compliance Alignment: Both meet ROHS3 and REACH requirements

The primary design consideration is the current rating differential: SC3DM-102 supports 270 mA while SRR6603-102ML supports 150 mA. This substitution is valid only in applications where the actual operating current does not exceed 150 mA.

Parameter Comparison

Engineering Selection Recommendations

The SRR6603-102ML is the designated manufacturer-recommended substitute for the obsolete SC3DM-102. Selection of this substitute is appropriate based on:

• Active Product Status: SRR6603-102ML maintains active production status, ensuring long-term availability and supply chain continuity
• Regulatory Compliance: Both components meet ROHS3 and REACH requirements, maintaining compliance posture across jurisdictions
• Electrical Equivalence: Matching inductance value, DC resistance, and shielding configuration ensure functional compatibility in the circuit topology
• Thermal Range: The SRR6603-102ML extends the lower operating temperature limit to -55°C, providing enhanced performance margin in cold environments

The current rating reduction from 270 mA to 150 mA requires circuit-level verification to confirm that actual operating current remains within the substitute part's specification.

Frequently Asked Questions (FAQ)

Q: Can the SRR6603-102ML directly replace the SC3DM-102 in all applications?

A: Direct replacement is valid only when the circuit's maximum operating current does not exceed 150 mA. Applications requiring currents between 150 mA and 270 mA require alternative component selection or circuit redesign.

Q: What is the significance of the inductance tolerance difference (±30% vs ±20%)?

A: The SRR6603-102ML provides tighter tolerance control, resulting in more consistent inductance values across production batches. This may improve circuit performance in applications sensitive to inductance variation.

Q: Are the physical dimensions compatible for PCB layout?

A: Yes. The package footprints are equivalent within manufacturing tolerances. The length difference of 0.10mm (6.50mm vs 6.60mm) and height difference of 0.10mm (3.10mm vs 3.00mm) are within standard PCB design margins for nonstandard surface mount packages.

Q: What does the higher saturation current (45 mA vs 9 mA) indicate?

A: The SRR6603-102ML exhibits higher saturation current, indicating greater core material stability under DC bias conditions. This characteristic may provide improved performance in applications with DC offset currents.

Q: Is the Tape & Reel packaging compatible with existing assembly processes?

A: Tape & Reel packaging is standard for automated surface mount assembly. Compatibility depends on your assembly equipment specifications and feeder configurations. Verify with your manufacturing partner.

Q: Why is the operating temperature range extended on the substitute part?

A: The SRR6603-102ML supports -55°C minimum temperature compared to -40°C for the SC3DM-102. This extended range reflects the Bourns design specification and provides additional thermal margin for demanding applications.