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STB40NF10LT4 Equivalent & Substitute Parts
Part Overview
The STB40NF10LT4 is an N-Channel 100V 40A MOSFET manufactured by STMicroelectronics in the STripFET™ II series. This surface mount device is housed in a D2PAK (TO-263-3) package and is rated for 150W power dissipation at case temperature. The part is currently in active production status with 1572 units in stock.
Substitute parts are identified when equivalent electrical performance can be achieved within the specified parameter ranges while maintaining the same package form factor and mounting technology. Alternative devices may be required due to supply chain considerations, design optimization, or specific application requirements.
Substiute Parts
Key Parameters
| Parameter | Value | Unit |
|---|---|---|
| Drain to Source Voltage (Vdss) | 100 | V |
| Continuous Drain Current (Id) @ 25°C | 40 | A (Tc) |
| On-State Resistance (Rds On) @ 20A, 10V | 33 | mOhm |
| Gate Threshold Voltage (Vgs(th)) @ 250µA | 2.5 | V |
| Gate Charge (Qg) @ 4.5V | 64 | nC |
| Power Dissipation (Max) | 150 | W (Tc) |
| Operating Temperature Range | -65 to 175 | °C (TJ) |
| Package Type | D2PAK (TO-263-3) | Surface Mount |
| FET Type | N-Channel | MOSFET |
Substitute Part Grouping Explanation
Substitution eligibility for the STB40NF10LT4 is determined by the following criteria:
Primary Electrical Parameters:
- Drain to Source Voltage (Vdss): Must equal 100V
- FET Type: Must be N-Channel MOSFET
- Continuous Drain Current (Id): Must be ≥40A at 25°C case temperature
- On-State Resistance (Rds On): Lower values indicate improved performance; values ≤33mOhm @ 10V are preferred
- Gate Threshold Voltage (Vgs(th)): Must be compatible with 5V and 10V drive voltage levels
Package and Mounting Requirements:
- Package Type: D2PAK (TO-263-3) surface mount only
- Mounting Technology: Surface mount compatible with standard PCB assembly processes
Compliance and Status:
- RoHS3 Compliance: Required
- Moisture Sensitivity Level: MSL 1 (Unlimited) preferred
- Product Status: Active status preferred; obsolete parts listed for reference only
Substitute parts meeting these criteria can be directly interchanged in applications designed for the STB40NF10LT4 without circuit modification, provided thermal management and gate drive characteristics remain within design specifications.
Parameter Comparison
| Part Number | Manufacturer | Vdss (V) | Id @ 25°C (A) | Rds On @ 10V (mOhm) | Vgs(th) (V) | Power Dissipation (W) | Status | Package |
|---|---|---|---|---|---|---|---|---|
| STB40NF10LT4 | STMicroelectronics | 100 | 40 | 33 | 2.5 | 150 | Active | D2PAK |
| BUK7626-100B,118 | Nexperia USA Inc. | 100 | 49 | 26 | 4.0 | 157 | Obsolete | D2PAK |
| BUK9629-100B,118 | Nexperia USA Inc. | 100 | 46 | 27 | 2.0 | 157 | Active | D2PAK |
| BUK9640-100A,118 | Nexperia USA Inc. | 100 | 39 | 39 | 2.0 | 158 | Active | D2PAK |
| FDB3672-F085 | onsemi | 100 | 44 | 28 | 4.0 | 120 | Obsolete | D2PAK |
| HUF75639S3ST | Fairchild Semiconductor | 100 | 56 | 25 | 4.0 | 200 | Active | D2PAK |
| HUF76639S3ST | onsemi | 100 | 51 | 26 | 3.0 | 180 | Active | D2PAK |
| IPB35N10S3L26ATMA1 | Infineon Technologies | 100 | 35 | 26.3 | 2.4 | 71 | Active | D2PAK |
| IRF3710STRLPBF | Infineon Technologies | 100 | 57 | 23 | 4.0 | 200 | Active | D2PAK |
| IRF3710ZSTRLPBF | Infineon Technologies | 100 | 59 | 18 | 4.0 | 160 | Active | D2PAK |
| IRF540NSTRLPBF | Infineon Technologies | 100 | 33 | 44 | 4.0 | 130 | Active | D2PAK |
Engineering Selection Recommendations
Preferred Substitutes (Active Status, Full Compliance):
The following parts are recommended as primary substitutes based on active product status, AEC-Q101 automotive qualification where applicable, and RoHS3 compliance:
BUK9629-100B,118 (Nexperia USA Inc.) represents the closest electrical match with 46A continuous drain current, 27mOhm on-state resistance, and 157W power dissipation. This part carries AEC-Q101 automotive qualification and is in active production with 10506 units in stock.
HUF76639S3ST (onsemi) provides 51A continuous drain current with 26mOhm on-state resistance and 180W power dissipation. This part is in active production status with 1402 units available.
IRF3710STRLPBF (Infineon Technologies) offers 57A continuous drain current with 23mOhm on-state resistance and 200W power dissipation. This part is in active production with 24197 units in stock.
IRF3710ZSTRLPBF (Infineon Technologies) provides the lowest on-state resistance at 18mOhm with 59A continuous drain current and 160W power dissipation. This part is in active production with 3128 units available.
Secondary Substitutes (Obsolete Status, Reference Only):
BUK7626-100B,118 (Nexperia USA Inc.) is marked obsolete but carries AEC-Q101 automotive qualification. This part offers 49A continuous drain current and 26mOhm on-state resistance.
FDB3672-F085 (onsemi) is marked obsolete but carries AEC-Q101 automotive qualification. This part provides 44A continuous drain current with 28mOhm on-state resistance.
Limited Current Substitutes:
IPB35N10S3L26ATMA1 (Infineon Technologies) provides 35A continuous drain current, which is below the 40A specification of the STB40NF10LT4. This part is suitable only for applications with reduced current requirements and carries AEC-Q101 automotive qualification.
BUK9640-100A,118 (Nexperia USA Inc.) provides 39A continuous drain current, which is marginally below the 40A specification. This part carries AEC-Q101 automotive qualification and is in active production.
IRF540NSTRLPBF (Infineon Technologies) provides 33A continuous drain current, which is below the 40A specification. This part is suitable only for applications with reduced current requirements.
Frequently Asked Questions (FAQ)
Q: Can I use a substitute part with lower continuous drain current than the STB40NF10LT4?
A: Substitution with lower current ratings (such as IPB35N10S3L26ATMA1 at 35A or BUK9640-100A,118 at 39A) is only acceptable if the application circuit operates below the substitute part's rated current. The circuit design must be verified to ensure continuous drain current does not exceed the substitute device's specification.
Q: What is the significance of on-state resistance (Rds On) differences between substitute parts?
A: On-state resistance directly affects power dissipation and heat generation. Lower Rds On values (such as IRF3710ZSTRLPBF at 18mOhm) result in reduced power loss and lower junction temperatures. Higher Rds On values (such as IRF540NSTRLPBF at 44mOhm) result in increased power dissipation and may require enhanced thermal management.
Q: Are obsolete parts acceptable for new designs?
A: Obsolete parts (BUK7626-100B,118 and FDB3672-F085) should not be used in new designs due to supply chain discontinuation risk. These parts are listed for reference in legacy system maintenance only.
Q: What is the importance of gate threshold voltage (Vgs(th)) compatibility?
A: Gate threshold voltage determines the minimum gate-source voltage required to turn the device on. The STB40NF10LT4 has Vgs(th) of 2.5V at 250µA. Substitute parts with higher Vgs(th) values (such as 4.0V) may require different gate drive circuit design to ensure proper switching performance.
Q: Can I substitute parts with different power dissipation ratings?
A: Power dissipation rating indicates the maximum thermal load the device can handle at case temperature. Substitutes with higher power dissipation ratings (such as HUF75639S3ST at 200W versus STB40NF10LT4 at 150W) provide additional thermal margin. Substitutes with lower power dissipation ratings require verification that circuit thermal conditions remain within specification.
Q: Are all substitute parts RoHS3 compliant?
A: All listed substitute parts are RoHS3 compliant. Moisture Sensitivity Level (MSL) 1 (Unlimited) is specified for all parts, indicating no moisture sensitivity restrictions during storage and handling.
Q: What is the difference between Cut Tape (CT) and Tape & Reel (TR) packaging?
A: Cut Tape packaging is supplied on individual tape segments suitable for manual or small-volume assembly. Tape & Reel packaging is supplied on continuous reels suitable for high-volume automated assembly. Both packaging formats contain identical devices; selection depends on assembly process requirements.
Q: Can I use substitute parts with higher gate charge (Qg) values?
A: Higher gate charge values require longer switching times and increased gate drive current. Substitutes with significantly higher Qg values (such as HUF75639S3ST at 130nC versus STB40NF10LT4 at 64nC) may require gate drive circuit redesign to maintain switching frequency and efficiency targets.
Q: Are automotive-qualified parts (AEC-Q101) required for all applications?
A: AEC-Q101 qualification is required only for automotive applications. Industrial and consumer applications may use non-qualified parts. Several substitute parts carry AEC-Q101 qualification (BUK9629-100B,118, BUK9640-100A,118, FDB3672-F085, IPB35N10S3L26ATMA1) for applications requiring automotive-grade reliability.
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