SFT1446-TL-H Equivalent & Substitute Parts

Part Overview

The SFT1446-TL-H is an N-Channel 60V 20A MOSFET manufactured by onsemi in the TP-FA surface mount package. This device is classified as obsolete, making equivalent and substitute parts necessary for ongoing design support and production continuity. The part delivers 1W power dissipation at Ta and 23W at Tc, with a maximum Rds(on) of 51mOhm at 10A and 10V gate-source voltage. Identifying compatible alternatives ensures design flexibility and supply chain resilience for applications requiring N-Channel MOSFETs with 60V drain-source voltage ratings and 20A continuous drain current capability.

Substiute Parts

SFT1446-TL-H

onsemiIn Stock: 2252SFT1446-TL-H Datasheet

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NTD20N06T4G

onsemiIn Stock: 33293NTD20N06T4G Datasheet

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RFD12N06RLESM9A

onsemiIn Stock: 7401RFD12N06RLESM9A Datasheet

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RFD16N06LESM9A

onsemiIn Stock: 3604RFD16N06LESM9A Datasheet

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AOD444

Alpha & Omega Semiconductor Inc.In Stock: 120173AOD444 Datasheet

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DMN6068LK3Q-13

Diodes IncorporatedIn Stock: 4623DMN6068LK3Q-13 Datasheet

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TK8S06K3L(T6L1,NQ)

Toshiba Semiconductor and StorageIn Stock: 2725TK8S06K3L(T6L1,NQ) Datasheet

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ZXMN6A25KTC

Diodes IncorporatedIn Stock: 2036ZXMN6A25KTC Datasheet

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Key Parameters

Substitute Part Grouping Explanation

Substitution of the SFT1446-TL-H is determined by strict alignment of the following electrical and mechanical parameters:

Primary Substitution Criteria:

• Drain-Source Voltage (Vdss): 60V (exact match required)
• Continuous Drain Current (Id): 20A minimum at 25°C
• FET Type: N-Channel
• Technology: MOSFET (Metal Oxide)
• Package Type: TO-252-3, DPAK (2 Leads + Tab), SC-63 or equivalent surface mount DPAK variants
• Gate-Source Voltage (Vgs) Max: ±20V or greater
• Mounting Type: Surface Mount

Secondary Compatibility Parameters:

• Rds(on) Max: 51mOhm or lower at specified Id and Vgs conditions
• Gate Charge (Qg): 16nC or lower at 10V
• Input Capacitance (Ciss): 750pF or lower at specified Vds
• Power Dissipation: Minimum 1W at Ta, 23W at Tc
• Moisture Sensitivity Level: 1 (Unlimited)
• REACH Status: REACH Unaffected

Substitute parts must meet or exceed the electrical performance of the original part while maintaining mechanical compatibility with the TO-252-3 DPAK package footprint. Parts with lower continuous drain current ratings or higher Rds(on) values are listed for reference but represent performance trade-offs requiring application-level validation.

Parameter Comparison

Engineering Selection Recommendations

Primary Substitute (Full Electrical Equivalence):

The NTD20N06T4G from onsemi is the primary substitute for the SFT1446-TL-H. This part maintains the same 60V Vdss rating and 20A continuous drain current specification. The NTD20N06T4G delivers superior Rds(on) performance at 46mOhm versus 51mOhm, operates across an extended temperature range of -55°C to 175°C (versus 150°C maximum for the original), and carries Active product status with ROHS3 compliance. The part is available in high inventory (33,200 pcs) in DPAK packaging, ensuring supply continuity and mechanical compatibility with the original TO-252-3 footprint.

Secondary Substitutes (Performance Trade-offs):

RFD12N06RLESM9A and RFD16N06LESM9A from onsemi represent alternatives with reduced continuous drain current ratings (18A and 16A respectively) but improved power dissipation characteristics (49W and 90W at Tc). These parts are suitable for applications where the full 20A rating is not required. Both maintain 60V Vdss, ROHS3 compliance, and Active product status.

Lower Current Alternatives:

AOD444 (Alpha & Omega Semiconductor), DMN6068LK3Q-13 (Diodes Incorporated), TK8S06K3L(T6L1,NQ) (Toshiba), and ZXMN6A25KTC (Diodes Incorporated) are listed as alternatives with continuous drain currents ranging from 4A to 8.5A. These parts are suitable only for applications with reduced current requirements and represent significant performance reductions from the original 20A specification. All maintain 60V Vdss and surface mount DPAK packaging.

Compliance and Availability:

All active substitute parts carry ROHS3 compliance and REACH Unaffected status, meeting modern regulatory requirements. Moisture Sensitivity Level 1 (Unlimited) is maintained across all alternatives. The NTD20N06T4G offers the highest inventory availability and represents the recommended path for direct replacement in new designs and production continuity.

Frequently Asked Questions (FAQ)

Q: Can the NTD20N06T4G directly replace the SFT1446-TL-H in existing designs?

A: The NTD20N06T4G is electrically compatible with the SFT1446-TL-H, matching the 60V Vdss and 20A continuous drain current specifications. Both parts use the TO-252-3 DPAK package footprint, enabling direct PCB-level substitution. The NTD20N06T4G offers improved Rds(on) performance (46mOhm versus 51mOhm) and extended operating temperature range (-55°C to 175°C versus 150°C maximum). No circuit modifications are required.

Q: What is the primary reason for substituting the SFT1446-TL-H?

A: The SFT1446-TL-H is classified as obsolete, making it unavailable for new production orders and long-term supply commitments. Active substitute parts ensure design continuity and supply chain resilience. The NTD20N06T4G provides equivalent electrical performance with the added benefit of Active product status and higher inventory availability.

Q: Are all substitute parts available in the same package as the original?

A: All listed substitute parts use TO-252-3 DPAK or equivalent surface mount packages (DPAK, DPAK+, TO-252AA, TO-252-3). These packages share the same PCB footprint and pin configuration, enabling direct mechanical substitution. Specific package variants (TP-FA for the original, DPAK for NTD20N06T4G, TO-252AA for RFD series) are functionally equivalent in surface mount applications.

Q: Which substitute part offers the best performance improvement?

A: The NTD20N06T4G provides the most direct performance improvement, delivering lower Rds(on) (46mOhm versus 51mOhm at 10A, 10V), higher power dissipation capability (60W at Tj versus 23W at Tc), and extended operating temperature range (175°C versus 150°C). These improvements enhance thermal performance and switching efficiency in high-current applications.

Q: Can I use RFD12N06RLESM9A or RFD16N06LESM9A if my application does not require the full 20A rating?

A: Yes. RFD12N06RLESM9A (18A) and RFD16N06LESM9A (16A) are suitable for applications with reduced current requirements. Both maintain 60V Vdss and offer superior power dissipation (49W and 90W at Tc respectively). However, these parts represent a reduction in available current capacity and should only be selected if application requirements confirm that 18A or 16A continuous drain current is sufficient.

Q: What is the significance of the lower current alternatives (AOD444, DMN6068LK3Q-13, TK8S06K3L, ZXMN6A25KTC)?

A: These parts maintain the 60V Vdss rating and DPAK package compatibility but deliver significantly reduced continuous drain current (4A to 8.5A). They are listed as cross-reference alternatives for applications with substantially lower current requirements. Direct substitution of these parts in designs requiring 20A operation will result in thermal stress and potential device failure. Application-level validation is required before selection.

Q: Are there any compliance or regulatory differences between the original and substitute parts?

A: All active substitute parts carry ROHS3 compliance and REACH Unaffected status, meeting current regulatory requirements. The original SFT1446-TL-H does not specify RoHS status. Moisture Sensitivity Level 1 (Unlimited) is maintained across all parts, eliminating moisture-related handling concerns. No additional compliance validation is required for substitution.

Q: What inventory considerations should I evaluate when selecting a substitute?

A: The NTD20N06T4G offers the highest inventory availability (33,200 pcs), ensuring supply continuity for production and design support. RFD12N06RLESM9A (7,329 pcs) and RFD16N06LESM9A (3,538 pcs) provide moderate availability. Lower current alternatives such as AOD444 (120,100 pcs) and TK8S06K3L (2,680 pcs) vary in availability. Inventory levels should be confirmed with suppliers for long-term production planning.

Q: How do gate charge and input capacitance differences affect circuit design?

A: The NTD20N06T4G exhibits higher gate charge (30nC versus 16nC) and input capacitance (1015pF versus 750pF), requiring slightly higher gate drive current and longer switching times compared to the original. These differences are within typical design margins for MOSFET gate driver circuits operating at standard switching frequencies. No gate driver redesign is required for substitution in most applications. Lower current alternatives (AOD444, DMN6068LK3Q-13, TK8S06K3L, ZXMN6A25KTC) offer reduced gate charge and capacitance, potentially improving switching speed in gate-drive-limited applications.