SC414MF-270 Equivalent & Substitute Parts

Part Overview

The SC414MF-270 is a 27 µH shielded inductor manufactured by Signal Transformer, rated for 620 mA continuous current with a maximum DC resistance of 792 mOhm. This component is classified as obsolete, making identification of suitable substitute parts essential for ongoing design support and procurement continuity. The part operates across the temperature range of -40°C to 125°C and is mounted as a surface mount device in a nonstandard package measuring 4.30mm × 4.30mm × 1.50mm (max height).

Substiute Parts

SC414MF-270

Signal TransformerIn Stock: 985SC414MF-270 Datasheet

Current PartRFQ

VLCF4020T-270MR48

TDK CorporationIn Stock: 15467VLCF4020T-270MR48 Datasheet

MFR RecommendedRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution of the SC414MF-270 is determined by the following critical parameters:

• Inductance Value: Must be 27 µH with ±20% tolerance to maintain circuit functionality
• Current Rating: Substitute must support minimum 620 mA continuous current; lower ratings are not acceptable
• DC Resistance: Maximum 792 mOhm; lower DCR values are acceptable as they reduce power dissipation
• Shielding: Must be shielded to maintain electromagnetic compatibility
• Surface Mount Configuration: Substitute must be surface mount compatible
• Environmental Compliance: RoHS3 compliance and MSL rating of 1 required

The VLCF4020T-270MR48 from TDK Corporation meets the inductance, tolerance, shielding, and compliance requirements. However, the current rating of 480 mA is below the original 620 mA specification, and the operating temperature maximum is reduced from 125°C to 105°C.

Parameter Comparison

Engineering Selection Recommendations

The VLCF4020T-270MR48 is the manufacturer-recommended substitute for the obsolete SC414MF-270. Both parts maintain identical inductance values, tolerance specifications, and shielding characteristics. Both are ROHS3 compliant with MSL rating of 1.

Key considerations for selection:

• The substitute part has a lower current rating (480 mA versus 620 mA). Applications requiring the full 620 mA rating must be re-evaluated for thermal and saturation performance.
• The substitute part has superior DC resistance (496 mOhm versus 792 mOhm), resulting in lower power dissipation and improved efficiency.
• The operating temperature maximum is reduced from 125°C to 105°C. Applications operating above 105°C require thermal analysis or alternative solutions.
• The substitute part is actively manufactured and readily available (15,370 pcs in stock), ensuring long-term procurement viability compared to the obsolete original.

Frequently Asked Questions (FAQ)

Q: Can the VLCF4020T-270MR48 be used as a direct replacement for the SC414MF-270?

A: The VLCF4020T-270MR48 is electrically compatible for applications operating at or below 480 mA continuous current and 105°C maximum temperature. Applications requiring the full 620 mA rating or operating above 105°C require circuit re-evaluation.

Q: What is the impact of the lower current rating on circuit performance?

A: The 480 mA saturation current of the substitute matches the original part's saturation specification. However, the continuous current rating is reduced from 620 mA to 480 mA. Circuits operating above 480 mA will experience increased core saturation and potential inductor failure.

Q: Does the lower DC resistance of the substitute part affect circuit operation?

A: Lower DC resistance (496 mOhm versus 792 mOhm) reduces power dissipation and heat generation. This is a beneficial characteristic that improves efficiency and thermal performance. No negative circuit impact is expected.

Q: Are both parts physically compatible on the same PCB layout?

A: The original part measures 4.30mm × 4.30mm × 1.50mm (max height), while the substitute measures 4.00mm × 4.00mm × 2.00mm (max height). The substitute is slightly smaller in footprint but taller. PCB layout verification is required to confirm mechanical clearance, particularly for height constraints.

Q: What compliance certifications apply to both parts?

A: Both parts are ROHS3 compliant, REACH unaffected, and classified as EAR99 for export control purposes. Both carry MSL rating of 1 (unlimited moisture sensitivity protection).