SC312MF-150 Equivalent & Substitute Parts

Part Overview

The SC312MF-150 is a 15 µH shielded wirewound inductor manufactured by Signal Transformer, rated for 480 mA continuous current with a maximum DC resistance of 900mOhm. This component is classified as obsolete, making identification of compatible substitute parts essential for ongoing design support and production continuity. The part operates across the temperature range of -40°C to 125°C and is ROHS3 compliant with unlimited moisture sensitivity rating.

Substiute Parts

SC312MF-150

Signal TransformerIn Stock: 979SC312MF-150 Datasheet

Current PartRFQ

1231AS-H-150M=P3

Murata ElectronicsIn Stock: 19771231AS-H-150M=P3 Datasheet

MFR RecommendedRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution of the SC312MF-150 is determined by the following critical parameters:

• Inductance Value: Must be 15 µH with ±20% tolerance to maintain circuit functionality
• Current Rating: Substitute must support minimum 480 mA continuous current without saturation
• DC Resistance: Lower DCR values are acceptable; higher values may impact circuit efficiency
• Shielding: Shielded construction required to maintain electromagnetic compatibility
• Mounting Type: Surface mount configuration mandatory for PCB compatibility
• Physical Dimensions: Nonstandard package requires verification of footprint compatibility
• Operating Temperature Range: Must support -40°C to 125°C minimum
• Compliance: ROHS3 compliance and unlimited MSL rating required

The Murata Electronics 1231AS-H-150M=P3 meets these substitution criteria with equivalent inductance, superior current handling capability, lower DC resistance, and active product status.

Parameter Comparison

Engineering Selection Recommendations

The 1231AS-H-150M=P3 from Murata Electronics is the qualified substitute for the obsolete SC312MF-150. Selection is based on the following engineering criteria:

Compliance and Availability: The substitute maintains ROHS3 compliance and unlimited MSL rating. As an active product with 1927 units in stock, it provides production continuity compared to the obsolete SC312MF-150.

Electrical Performance: Both components share identical 15 µH inductance at ±20% tolerance and 100 kHz test frequency. The substitute provides superior current handling at 1.1 A versus 480 mA, with equivalent saturation current performance. The 222 mOhm maximum DCR of the substitute is significantly lower than the 900 mOhm specification of the original part, resulting in reduced power dissipation.

Physical Compatibility: Dimensional differences exist between the parts. The substitute measures 3.70mm x 3.90mm with 1.80mm maximum seated height, compared to the original 3.80mm x 3.80mm with 1.35mm height. PCB footprint verification is required prior to implementation.

Temperature Range Consideration: The original part operates to 125°C maximum, while the substitute operates to 85°C maximum. Applications requiring operation above 85°C require alternative evaluation.

Frequently Asked Questions (FAQ)

Q: Can the 1231AS-H-150M=P3 directly replace the SC312MF-150 in all applications?

A: The substitute meets the core electrical requirements of 15 µH inductance, shielded construction, and surface mount configuration. However, PCB layout verification is necessary due to dimensional differences in footprint and height. Applications operating above 85°C ambient temperature require alternative component selection.

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

A: The 1231AS-H-150M=P3 exhibits 222 mOhm maximum DCR compared to 900 mOhm in the original part. This represents a 75% reduction in series resistance, resulting in lower I²R losses and improved thermal performance in the inductor. This is a beneficial characteristic for power efficiency.

Q: Are there packaging differences between these parts?

A: The SC312MF-150 packaging is not specified in available documentation. The 1231AS-H-150M=P3 is supplied in Tape & Reel (TR) format. Verify reel compatibility with your assembly equipment.

Q: What is the impact of the higher current rating on the substitute part?

A: The 1231AS-H-150M=P3 is rated for 1.1 A continuous current, exceeding the 480 mA requirement of the original application. This provides design margin and reduces thermal stress on the component during operation.

Q: How should I verify footprint compatibility before implementation?

A: Obtain detailed mechanical drawings for both components from the respective manufacturers. The substitute dimensions of 3.70mm x 3.90mm x 1.80mm (max height) must be compared against your PCB pad layout and clearance requirements. Prototype validation is recommended for critical applications.