SC312MF-120 Equivalent & Substitute Parts

Part Overview

The SC312MF-120 is a 12 µH shielded wirewound inductor manufactured by Signal Transformer, rated for 500 mA continuous current with a maximum DC resistance of 792 mOhm. This component is classified as obsolete, making equivalent substitutes necessary for new designs and ongoing production requirements. 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-120

Signal TransformerIn Stock: 828SC312MF-120 Datasheet

Current PartRFQ

1231AS-H-120M=P3

Murata ElectronicsIn Stock: 48361231AS-H-120M=P3 Datasheet

MFR RecommendedRFQ

Key Parameters

Substitute Part Grouping Explanation

The 1231AS-H-120M=P3 manufactured by Murata Electronics qualifies as a direct substitute based on the following critical parameters:

Inductance value matches at 12 µH with identical ±20% tolerance, ensuring functional equivalence in circuit operation. Both components maintain shielded construction and surface mount configuration. The saturation current specification is identical at 850 mA, confirming magnetic core performance compatibility.

The substitute part exceeds the original specification in current rating capacity (1.2 A versus 500 mA) and provides superior DC resistance performance (186 mOhm Max versus 792 mOhm Max), making it suitable for applications requiring the original part's electrical characteristics. Physical dimensions remain comparable within nonstandard package constraints (3.70mm x 3.90mm x 1.80mm Max Height versus 3.80mm x 3.80mm x 1.35mm Max Height).

Both components are RoHS3 compliant, MSL Level 1, and tested at 100 kHz inductance frequency. The substitute part carries active product status with established supply availability.

Parameter Comparison

Engineering Selection Recommendations

The 1231AS-H-120M=P3 is the qualified substitute for SC312MF-120 applications. The substitute part maintains active product status with established manufacturing continuity, addressing the obsolescence of the original component. Both parts carry identical RoHS3 compliance and MSL Level 1 ratings, ensuring regulatory and environmental compatibility.

The substitute provides enhanced electrical performance through reduced DC resistance (186 mOhm versus 792 mOhm) and increased current capacity (1.2 A versus 500 mA), delivering superior thermal and electrical characteristics for the specified 12 µH inductance value. Physical dimensions remain within acceptable tolerance for nonstandard surface mount packages.

The operating temperature range of the substitute extends to 85°C, which covers standard industrial and commercial applications. Applications requiring operation above 85°C should be evaluated against specific thermal requirements.

Frequently Asked Questions (FAQ)

Q: Can the 1231AS-H-120M=P3 directly replace the SC312MF-120 in existing designs?

A: Yes. Both components share identical inductance (12 µH ±20%), saturation current (850 mA), shielding configuration, and surface mount construction. The substitute meets or exceeds all critical electrical specifications of the original part.

Q: What is the impact of the different DC resistance values?

A: The substitute part features significantly lower DC resistance (186 mOhm versus 792 mOhm). This reduces resistive losses and heat generation in the inductor, improving circuit efficiency. Applications designed for the original 792 mOhm specification will experience improved performance with the lower resistance substitute.

Q: Are there physical compatibility concerns?

A: Dimensions are comparable (3.70mm x 3.90mm x 1.80mm Max Height versus 3.80mm x 3.80mm x 1.35mm Max Height). The substitute is slightly taller by 0.45mm. PCB layout and component clearance should be verified for space-constrained applications.

Q: What is the significance of the operating temperature range difference?

A: The original part operates to 125°C while the substitute operates to 85°C. For applications requiring operation above 85°C, the substitute may not be suitable. Standard commercial and industrial applications typically operate within the 85°C limit.

Q: Does packaging format affect substitution?

A: The original part is supplied in bulk packaging while the substitute is supplied in Tape & Reel format. This affects procurement and assembly processes but does not impact electrical or mechanical compatibility. Tape & Reel packaging is standard for automated assembly operations.

Q: Are both parts RoHS3 compliant?

A: Yes. Both SC312MF-120 and 1231AS-H-120M=P3 are RoHS3 compliant with MSL Level 1 ratings, meeting current environmental and regulatory requirements.