SC312MF-470 Equivalent & Substitute Parts

Part Overview

The SC312MF-470 is a 47 µH shielded wirewound inductor manufactured by Signal Transformer, rated for 250 mA continuous current with a maximum DC resistance of 3 Ohm. This component is classified as obsolete, making identification of functionally equivalent alternatives necessary 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

SC312MF-470

Signal TransformerIn Stock: 1020SC312MF-470 Datasheet

Current PartRFQ

74404041470

Würth ElektronikIn Stock: 573474404041470 Datasheet

MFR RecommendedRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution of the SC312MF-470 is determined by the following critical parameters:

• Inductance Value: 47 µH with ±20% tolerance
• Current Rating: Minimum 250 mA continuous current capability
• DC Resistance: Maximum 3 Ohm to maintain circuit performance
• Saturation Current: Minimum 440 mA to prevent core saturation under transient conditions
• Mounting Type: Surface Mount configuration
• Operating Temperature Range: -40°C to 125°C
• Regulatory Compliance: ROHS3 compliant

The Würth Elektronik 74404041470 qualifies as a substitute based on matching inductance value, tolerance, operating temperature range, and regulatory compliance. While the substitute exhibits lower DC resistance (987 mOhm versus 3 Ohm maximum) and higher current rating (560 mA versus 250 mA), these represent improvements in electrical performance. The substitute's semi-shielded configuration and slightly larger footprint (4.00mm x 4.00mm versus 3.80mm x 3.80mm) must be evaluated for specific circuit layout constraints.

Parameter Comparison

Engineering Selection Recommendations

The 74404041470 from Würth Elektronik is an active product with established supply availability, addressing the obsolescence status of the SC312MF-470. Both components meet ROHS3 compliance and operate across identical temperature ranges. The substitute provides superior electrical performance through lower DC resistance and higher current ratings, reducing power dissipation in the inductor. The semi-shielded configuration of the substitute may introduce different electromagnetic coupling characteristics compared to the fully shielded original; circuit-level electromagnetic compatibility assessment is required for applications sensitive to radiated emissions or susceptibility. The substitute's slightly larger footprint (0.20mm increase in length and width) and reduced height (0.06mm) must be accommodated within PCB layout constraints.

Frequently Asked Questions (FAQ)

Q: Can the 74404041470 directly replace the SC312MF-470 in all applications?

A: Both components share identical inductance values, tolerance, and operating temperature ranges. The substitute's lower DC resistance and higher current rating represent electrical improvements. However, the change from fully shielded to semi-shielded configuration and the footprint increase require circuit-level evaluation for electromagnetic compatibility and PCB layout compatibility.

Q: What is the significance of the DC resistance difference between these parts?

A: The SC312MF-470 specifies 3 Ohm maximum DC resistance, while the 74404041470 provides 987 mOhm. Lower DC resistance reduces resistive losses and heat generation in the inductor. Applications with tight power budget constraints benefit from the lower resistance of the substitute.

Q: Are there packaging differences between these inductors?

A: Both components use surface mount technology with nonstandard packages. The SC312MF-470 measures 3.80mm x 3.80mm with 1.35mm seated height. The 74404041470 measures 4.00mm x 4.00mm with 1.20mm seated height. PCB layout must accommodate the slightly larger footprint of the substitute.

Q: What does the change from shielded to semi-shielded mean for circuit performance?

A: Shielded inductors provide greater electromagnetic isolation from surrounding circuitry. Semi-shielded inductors offer reduced shielding effectiveness. Applications requiring high electromagnetic isolation should evaluate the semi-shielded configuration's impact on circuit noise performance and compliance with electromagnetic compatibility standards.

Q: Why is the SC312MF-470 marked as obsolete?

A: Obsolete status indicates the manufacturer has discontinued production. The 74404041470 is an active product with ongoing manufacturing support and supply availability, making it suitable for new designs and ongoing procurement.