SC1704-470 Equivalent & Substitute Parts

Part Overview

The SC1704-470 is a 47 µH unshielded inductor manufactured by Signal Transformer, rated for 350 mA continuous current with a maximum DC resistance of 2.16Ohm. This component is classified as obsolete, making equivalent substitutes necessary for ongoing production and maintenance applications. The part is surface-mounted in a nonstandard package measuring 6.70mm × 5.60mm with a maximum seated height of 1.10mm, suitable for compact circuit designs requiring fixed inductance filtering and energy storage functions.

Substiute Parts

SC1704-470

Signal TransformerIn Stock: 770SC1704-470 Datasheet

Current PartRFQ

SDR6603-470M

Bourns Inc.In Stock: 9318SDR6603-470M Datasheet

MFR RecommendedRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution of the SC1704-470 is determined by the following critical electrical and mechanical parameters:

Electrical Compatibility Criteria:

• Inductance value: 47 µH (fixed requirement)
• Inductance tolerance: ±20% (acceptable range)
• Operating temperature range: -40°C ~ 125°C (minimum requirement)
• Shielding type: Unshielded (functional equivalence)
• Inductance test frequency: 100 kHz (measurement standard)

Mechanical Compatibility Criteria:

• Mounting type: Surface Mount (required for PCB assembly)
• Package classification: Nonstandard (dimensional compatibility)
• Physical dimensions: Must accommodate 6.70mm × 5.60mm footprint and 1.10mm maximum height constraints

Performance Criteria:

• Current rating must equal or exceed 350 mA
• DC resistance must not exceed 2.16Ohm to maintain circuit performance
• Saturation current must support the application's peak current demands

The SDR6603-470M from Bourns Inc. meets all substitution criteria with improved electrical performance characteristics while maintaining mechanical compatibility within the specified envelope.

Parameter Comparison

Engineering Selection Recommendations

The SDR6603-470M is the qualified substitute for the obsolete SC1704-470. Selection is based on the following engineering factors:

Product Status: The SC1704-470 is obsolete, necessitating transition to an active product. The SDR6603-470M maintains active manufacturing status with established supply chain availability.

Electrical Performance: The substitute provides superior electrical characteristics with 500 mA current rating versus 350 mA, and significantly reduced DC resistance of 640mOhm compared to 2.16Ohm. These improvements enhance circuit efficiency and thermal performance.

Compliance Certification: Both components maintain ROHS3 compliance and MSL Level 1 (Unlimited) moisture sensitivity rating, ensuring compatibility with modern manufacturing and storage requirements.

Mechanical Compatibility: The SDR6603-470M footprint (6.60mm × 4.45mm) is compatible with the original 6.70mm × 5.60mm envelope. The increased seated height of 2.92mm versus 1.10mm requires PCB layout verification to confirm clearance in the application.

Functional Equivalence: Identical 47 µH inductance value, ±20% tolerance, and -40°C ~ 125°C operating temperature range ensure direct functional replacement in circuit applications.

Frequently Asked Questions (FAQ)

Q: Can the SDR6603-470M directly replace the SC1704-470 in existing designs?

A: Electrical substitution is direct based on matching inductance value, tolerance, and operating temperature range. Mechanical verification is required due to increased seated height (2.92mm vs. 1.10mm). PCB layout must confirm adequate clearance above the component.

Q: What are the key differences between these inductors?

A: The substitute offers improved current handling (500 mA vs. 350 mA), lower DC resistance (640mOhm vs. 2.16Ohm), and higher saturation current (500 mA vs. 200 mA). The main trade-off is increased height, which may impact compact designs.

Q: Are both components RoHS compliant?

A: Yes, both SC1704-470 and SDR6603-470M are ROHS3 compliant with MSL Level 1 rating, suitable for standard manufacturing and storage environments.

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

A: Lower DC resistance (640mOhm) reduces resistive losses and heat generation compared to the original part (2.16Ohm), improving overall circuit efficiency and component reliability.

Q: Is the footprint change significant for PCB redesign?

A: The lateral dimensions are nearly identical (6.60mm vs. 6.70mm length, 4.45mm vs. 5.60mm width), requiring minimal PCB footprint adjustment. The height increase from 1.10mm to 2.92mm is the primary consideration for clearance planning.

Q: What is the packaging format for the substitute?

A: The SDR6603-470M is supplied in Tape & Reel (TR) format, standard for automated assembly processes.