SC312MF-2R2 Equivalent & Substitute Parts

Part Overview

The SC312MF-2R2 is a 2.2 µH shielded wirewound inductor manufactured by Signal Transformer, rated for 1.2 A continuous current with a maximum DC resistance of 157mOhm. This component is classified as obsolete, making identification of functionally equivalent alternatives essential for ongoing production and design continuity. The part operates across the industrial temperature range of -40°C to 125°C and is RoHS3 compliant with unlimited moisture sensitivity rating.

Substiute Parts

SC312MF-2R2

Signal TransformerIn Stock: 748SC312MF-2R2 Datasheet

Current PartRFQ

74404042022

Würth ElektronikIn Stock: 366874404042022 Datasheet

MFR RecommendedRFQ

NRV2012T2R2MGF

Taiyo YudenIn Stock: 9203NRV2012T2R2MGF Datasheet

MFR RecommendedRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution eligibility for the SC312MF-2R2 is determined by the following critical parameters:

• Inductance Value: Must be 2.2 µH with ±20% tolerance
• Current Rating: Minimum 1.2 A continuous current capability
• Saturation Current: Minimum 2 A
• DC Resistance: Must not exceed 157 mOhm to maintain circuit performance
• Mounting Type: Surface mount configuration required
• Temperature Range: Must support -40°C to 125°C operation
• Compliance: RoHS3 compliance required

Two qualified substitutes meet these criteria with variations in shielding configuration and current handling capacity.

Parameter Comparison

Engineering Selection Recommendations

74404042022 (Würth Elektronik WE-LQS Series)

This substitute provides superior electrical performance with 2.2 A current rating and significantly reduced DC resistance of 42 mOhm compared to the original 157 mOhm specification. The part maintains active product status with AEC-Q200 automotive qualification. The semi-shielded drum core configuration differs from the original shielded design, requiring EMI assessment in sensitive applications. Package dimensions increase to 4.00mm x 4.00mm, necessitating PCB layout verification. This option is suitable for applications where improved current handling and lower losses are beneficial.

NRV2012T2R2MGF (Taiyo Yuden NR, V Type Series)

This substitute matches the original 1.2 A current rating and maintains comparable DC resistance at 154.8 mOhm. However, the part carries "Not For New Designs" status, limiting its suitability for new product development. The unshielded core configuration represents a departure from the original shielded design. Operating temperature range is reduced to -25°C to 120°C, excluding the lower -40°C specification. Package size is significantly smaller at 2.00mm x 2.00mm, offering potential PCB space advantages. Saturation current of 1.6 A falls below the original 2 A specification.

Frequently Asked Questions (FAQ)

Q: Can the 74404042022 substitute directly replace the SC312MF-2R2 in all applications?

A: The 74404042022 meets all critical electrical parameters including inductance, tolerance, and minimum current rating. However, the semi-shielded configuration differs from the original shielded design. Applications requiring specific EMI performance or shielding characteristics must be evaluated individually. Package size increase from 3.80mm to 4.00mm requires PCB layout verification.

Q: Why does the NRV2012T2R2MGF carry "Not For New Designs" status?

A: This designation indicates the manufacturer has discontinued active support for new product development. While the part remains available in inventory, it is intended for legacy system maintenance and repair only. New designs should prioritize the active 74404042022 substitute.

Q: What is the impact of different shielding configurations on circuit performance?

A: Shielding affects electromagnetic interference (EMI) characteristics and coupling behavior with adjacent components. The original shielded design provides maximum EMI containment. The 74404042022 semi-shielded configuration offers reduced EMI performance compared to fully shielded designs. The NRV2012T2R2MGF unshielded configuration provides minimal EMI containment. Selection depends on circuit layout, frequency content, and proximity to sensitive signals.

Q: Are there temperature range limitations with the substitutes?

A: The 74404042022 maintains the full -40°C to 125°C range of the original part. The NRV2012T2R2MGF is limited to -25°C to 120°C, excluding the lower temperature extreme. Applications requiring -40°C operation must use the 74404042022 or original part.

Q: How do package size differences affect PCB design?

A: The original SC312MF-2R2 measures 3.80mm x 3.80mm. The 74404042022 increases to 4.00mm x 4.00mm, requiring minimal additional space. The NRV2012T2R2MGF reduces to 2.00mm x 2.00mm, enabling significant space savings. PCB footprint libraries and routing must be updated accordingly for each substitute.

Q: What compliance certifications apply to these substitutes?

A: All three parts are RoHS3 compliant with MSL rating 1 (unlimited moisture sensitivity). The 74404042022 carries AEC-Q200 automotive qualification. The NRV2012T2R2MGF and original SC312MF-2R2 do not list automotive qualification. Selection for automotive applications should prioritize the AEC-Q200 qualified 74404042022.