SC414MF-330 Equivalent & Substitute Parts

Part Overview

The SC414MF-330 is a 33 µH shielded inductor manufactured by Signal Transformer, rated for 520 mA continuous current with a maximum DC resistance of 905 mOhm. This component is classified as obsolete, making substitute parts necessary for new designs and ongoing production requirements. The part operates across an industrial temperature range of -40°C to 125°C and meets ROHS3 compliance standards.

Substiute Parts

SC414MF-330

Signal TransformerIn Stock: 952SC414MF-330 Datasheet

Current PartRFQ

VLCF4020T-330MR47

TDK CorporationIn Stock: 2259VLCF4020T-330MR47 Datasheet

MFR RecommendedRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution of the SC414MF-330 is based on the following critical electrical and mechanical parameters:

Electrical Compatibility Criteria:

• Inductance value: 33 µH (±20% tolerance maintained)
• Current rating: Minimum 520 mA to support original circuit requirements
• Saturation current: Minimum 440 mA
• DC resistance: Lower values preferred to reduce power dissipation; maximum acceptable threshold determined by circuit design margins
• Shielding: Required to maintain electromagnetic isolation

Mechanical Compatibility Criteria:

• Surface mount package format
• Physical footprint: 4.30mm x 4.30mm maximum lateral dimensions
• Height constraint: 1.50mm maximum seated height for PCB assembly compatibility

Environmental & Compliance Criteria:

• Operating temperature range: Minimum -40°C to 105°C (substitute may have narrower range if circuit operates within this window)
• RoHS3 compliance required
• MSL rating: 1 (Unlimited) preferred for manufacturing flexibility

The VLCF4020T-330MR47 meets all substitution criteria within these parameters.

Parameter Comparison

Engineering Selection Recommendations

The VLCF4020T-330MR47 is the qualified substitute for the obsolete SC414MF-330 based on the following engineering factors:

Electrical Performance: Both parts maintain identical inductance values and tolerance specifications at the 100 kHz test frequency. The substitute's lower DC resistance (628 mOhm vs. 905 mOhm) provides improved efficiency and reduced thermal dissipation in the application circuit.

Current Handling: The substitute is rated for 470 mA continuous current, which is 50 mA below the original part's 520 mA rating. Circuit designers must verify that the application's maximum current demand does not exceed 470 mA. The saturation current specification of 470 mA on the substitute meets the original part's 440 mA minimum requirement.

Thermal Considerations: The substitute operates across -40°C to 105°C, which is 20°C narrower at the upper limit compared to the original -40°C to 125°C range. Applications requiring operation above 105°C are not suitable for this substitute.

Physical Integration: The substitute's lateral footprint (4.00mm x 4.00mm) is smaller than the original (4.30mm x 4.30mm), ensuring PCB layout compatibility. However, the seated height increases from 1.50mm to 2.00mm. PCB designs must accommodate this additional 0.50mm height to prevent component interference with adjacent circuitry or enclosure constraints.

Supply Chain & Compliance: The substitute is manufactured by TDK Corporation, an active supplier with 2210 units in stock, ensuring long-term availability. Both parts maintain ROHS3 compliance and MSL 1 ratings, supporting standard manufacturing and storage protocols.

Frequently Asked Questions (FAQ)

Q: Can the VLCF4020T-330MR47 directly replace the SC414MF-330 without circuit modifications?

A: Direct replacement is possible if the application's maximum continuous current does not exceed 470 mA and the operating temperature remains below 105°C. The lower DC resistance of the substitute may improve circuit efficiency. Verify PCB clearance for the additional 0.50mm height.

Q: What is the impact of the 50 mA current rating difference?

A: The substitute's 470 mA rating is 50 mA lower than the original 520 mA. If your circuit operates at or near 520 mA, the substitute is not suitable. If maximum current is below 470 mA, the substitute is acceptable. Review circuit current profiles during normal and fault conditions.

Q: Does the lower DC resistance affect circuit behavior?

A: Lower DC resistance reduces power dissipation and heat generation in the inductor. This is generally beneficial for circuit performance and thermal management. No negative effects are expected; verify that the application does not depend on the original part's higher resistance value.

Q: Is the 0.50mm height increase a concern?

A: The substitute is 2.00mm tall versus the original 1.50mm. Verify that your PCB layout, component placement, and enclosure design accommodate this additional height. If clearance is limited, the substitute may not be suitable.

Q: Are there any compliance or supply chain advantages to using the substitute?

A: Yes. The VLCF4020T-330MR47 is actively manufactured by TDK Corporation with robust inventory availability, whereas the SC414MF-330 is obsolete. Both parts maintain ROHS3 compliance and MSL 1 ratings. Using the active substitute ensures long-term supply chain stability and manufacturing support.

Q: What should I verify before finalizing the substitution?

A: Confirm that (1) maximum circuit current does not exceed 470 mA, (2) operating temperature remains below 105°C, (3) PCB layout accommodates the 2.00mm seated height, and (4) the lower DC resistance does not conflict with circuit design intent.