SC1704-331 Equivalent & Substitute Parts

Part Overview

The SC1704-331 is a 330 µH unshielded inductor manufactured by Signal Transformer, rated for 130 mA continuous current with a maximum DC resistance of 15Ohm. This component is classified as obsolete, making identification of suitable substitute parts essential for ongoing design support and procurement continuity. The part operates across the industrial temperature range of -40°C to 125°C and is ROHS3 compliant.

Substiute Parts

SC1704-331

Signal TransformerIn Stock: 1020SC1704-331 Datasheet

Current PartRFQ

SDR6603-331M

Bourns Inc.In Stock: 1202SDR6603-331M Datasheet

MFR RecommendedRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution of the SC1704-331 is determined by the following critical parameters:

• Inductance value: 330 µH ±20%
• Current rating: minimum 130 mA continuous
• Saturation current: minimum 90 mA
• DC resistance: must not exceed application requirements (15Ohm reference)
• Shielding configuration: unshielded
• Surface mount package compatibility
• Operating temperature range: -40°C to 125°C minimum
• Compliance certifications: ROHS3, REACH Unaffected

The SDR6603-331M from Bourns Inc. meets these substitution criteria with enhanced electrical performance characteristics.

Parameter Comparison

Engineering Selection Recommendations

The SDR6603-331M is a direct functional substitute for the SC1704-331. Both components share identical inductance values, tolerance specifications, and operating temperature ranges. The substitute part exceeds the original specification in current handling capacity (160 mA versus 130 mA) and saturation current (180 mA versus 90 mA), while providing significantly lower DC resistance (3.8Ohm versus 15Ohm maximum).

Both parts maintain ROHS3 compliance and unlimited moisture sensitivity rating. The SDR6603-331M carries active product status, ensuring continued availability and supply chain support. The substitute is suitable for direct replacement in applications where the SC1704-331 was originally specified.

Frequently Asked Questions (FAQ)

Q: Can the SDR6603-331M replace the SC1704-331 in existing designs?

A: Yes. Both inductors share the same 330 µH inductance value and ±20% tolerance. The substitute meets or exceeds all critical electrical parameters including current rating, saturation current, and operating temperature range.

Q: What are the physical dimension differences?

A: The SC1704-331 measures 0.264" L x 0.220" W x 0.043" H (6.70mm x 5.60mm x 1.10mm). The SDR6603-331M measures 0.260" L x 0.175" W x 0.115" H (6.60mm x 4.45mm x 2.92mm). The substitute is slightly taller and narrower. PCB layout verification is required to confirm mechanical fit.

Q: Are there compliance differences between the parts?

A: No. Both components are ROHS3 compliant, REACH unaffected, and carry MSL 1 (unlimited) moisture sensitivity ratings.

Q: Why is the DC resistance of the substitute significantly lower?

A: The SDR6603-331M uses a drum core wirewound construction with ferrite material, resulting in lower resistance compared to the SC1704-331. This characteristic reduces power dissipation in the inductor during operation.

Q: What packaging format is the substitute available in?

A: The SDR6603-331M is supplied in Tape & Reel (TR) format, suitable for automated assembly processes.