SC312MF-4R7 Equivalent & Substitute Parts

Part Overview

The SC312MF-4R7 is a 4.7 µH shielded wirewound inductor manufactured by Signal Transformer, rated for 840 mA continuous current with a maximum DC resistance of 318 mOhm. This component is classified as obsolete, making substitute parts necessary for new procurement and ongoing production support. The part operates across the temperature range of -40°C to 125°C and is fully RoHS3 compliant with MSL 1 rating.

Substiute Parts

SC312MF-4R7

Signal TransformerIn Stock: 1033SC312MF-4R7 Datasheet

Current PartRFQ

1229AS-H-4R7M=P3

Murata ElectronicsIn Stock: 40521229AS-H-4R7M=P3 Datasheet

MFR RecommendedRFQ

NRS2012T4R7MGJ

Taiyo YudenIn Stock: 2165NRS2012T4R7MGJ Datasheet

MFR RecommendedRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitute parts for the SC312MF-4R7 are qualified based on the following electrical and mechanical parameters:

• Inductance Value: Must be 4.7 µH with ±20% tolerance
• Shielding: Must be shielded construction
• Mounting Type: Must be surface mount
• Current Rating: Must support minimum 840 mA continuous current
• DC Resistance: Must not exceed 318 mOhm
• Compliance: Must maintain RoHS3 and REACH compliance
• Moisture Sensitivity: MSL 1 rating required

Both substitute parts meet these core electrical requirements while offering improved current handling or reduced DC resistance characteristics compared to the original obsolete part.

Parameter Comparison

Engineering Selection Recommendations

1229AS-H-4R7M=P3 (Murata Electronics) is the primary recommended substitute. This part is in active production status with superior electrical performance: current rating of 1.35 A exceeds the original 840 mA requirement, and DC resistance of 126 mOhm is significantly lower than the 318 mOhm maximum of the SC312MF-4R7. Full RoHS3 and REACH compliance is maintained. The operating temperature range of -40°C to 85°C covers standard industrial applications, though it does not extend to the upper 125°C limit of the original part. Inventory availability is substantial at 3982 pieces.

NRS2012T4R7MGJ (Taiyo Yuden) serves as a secondary alternative. This part maintains the original current rating of 910 mA with improved DC resistance of 241 mOhm. Product status is listed as "Not For New Designs," indicating this part is in end-of-life phase. Operating temperature range extends to 120°C, approaching the original specification. This option is suitable for legacy system maintenance where new design qualification is not required.

Frequently Asked Questions (FAQ)

Q: Can the 1229AS-H-4R7M=P3 substitute for SC312MF-4R7 in all applications?

A: The 1229AS-H-4R7M=P3 meets all core electrical requirements: 4.7 µH inductance, shielded construction, surface mount package, and current rating exceeding 840 mA. DC resistance is significantly improved at 126 mOhm versus 318 mOhm. The operating temperature range of -40°C to 85°C is suitable for most industrial applications. Applications requiring operation above 85°C should evaluate the Taiyo Yuden alternative or confirm thermal requirements.

Q: What is the difference between the two substitute parts?

A: The Murata 1229AS-H-4R7M=P3 offers superior current handling (1.35 A) and lower DC resistance (126 mOhm), with active production status. The Taiyo Yuden NRS2012T4R7MGJ provides higher temperature capability (120°C maximum) and maintains closer current rating alignment (910 mA) to the original part, but is in end-of-life status.

Q: Are there physical size differences between these parts?

A: Yes. The SC312MF-4R7 measures 0.150" × 0.150" (3.80mm × 3.80mm) with 0.053" height. The Murata substitute is 0.146" × 0.154" (3.70mm × 3.90mm) with 0.047" height. The Taiyo Yuden part is significantly smaller at 0.079" × 0.079" (2.00mm × 2.00mm) with 0.047" height. PCB layout verification is required before substitution.

Q: Do all parts maintain RoHS3 compliance?

A: Yes. The SC312MF-4R7, 1229AS-H-4R7M=P3, and NRS2012T4R7MGJ are all RoHS3 compliant with MSL 1 rating and REACH unaffected status.

Q: Which substitute should be used for new designs?

A: The 1229AS-H-4R7M=P3 from Murata Electronics is the recommended choice for new designs due to active production status, superior electrical performance, and robust inventory availability.